My father trained to be a gauge maker at C E Johansson in Eskilstuna Sweden. He emigrated to the US in 1947. I still have many of the Jo Blocks, micrometers, calipers, dial gauges he brought with him to this country. Some day I would like to drop in on AA Jansson just to talk about the stories Dad had of working at C E Johansson. I myself took up the tool and die trade and currently work as a tooling engineer in the Detroit area. Thanks for the RUclips Video.
Kudos to you and A.A. Jansson for setting this up. My jaw dropped when I saw that pristine CEJ/Ford block set! The dedication and skill of the people at A.A. Jansson is wonderful to see. Thanks for this.
This is one of the best channels for anyone in the manufacturing industry. I have been in manufacturing for over a decade and an avid RUclips watcher. No other channel cover a wider array of behind-the-scenes topics. I always learn something new. Keep up the great work.
Thank you for this video. I remember when my father, who was a quality control engineer, came home and told us about learning how to use gage blocks and optical flats in the 1950's.
Don, I find all your field trips fascinating to not only learn the history behind these companies, but to see what it actually takes for these companies to, get what they do, done. Millionths of an inch is really small, go watch "How thick is a sharpie mark?" On average a black sharpie mark with lines written on a gage block added 118 millionths of an inch to the gage block. So again one millionth of an inch is really small, you'd need to split that mark 118 times to get one millionth and a tenth indicator would only show roughly 1 and 1/3 lines on that indicator. That's intense. Thanks for sharing this Don, it really makes you think.
Way to go, Don. Too many of us in the precision trades think what is close enough for them is plenty close enough for the rest of the world. These days precision bearings (or any other item) made in Brazil have to fit a spindle made in Korea, which plugs into a headstock ... and so on to final destination from Paraguey to Perth to Pakistan. What ever is made in house for in house can be made to any standard you wish. But soon as your stuff has to fit stuff made across the street an agreed on system of measures saves time, conflict, and money. That's where precision measurement references come in. You and the people of A A Janssen illustrated the requirements and interdependence of the precision metalworkers of the world on well regulated international standards of measurement and made them understandable to the shop floor worker. And we got an industrial history lesson to boot. Many thanks.
This metrology game fascinates the life out of me. Even in England many old engineers refer to slip gauges (our term for the little blocks) as Joansson blocks. The name is respected within the engineering world.Being self taught, I started 17 years ago with a ruler, then a vernier, then a micrometer, then a 1/10 micrometer.All these were fine and dandy until I bought a small grinder and watched every Don Bailey video on grinding.It was Don Bailey that taught me everything about the little nuances of the strange world of the "tenth".Everything became 10 times more difficult than working in "thou's".I spent a small fortune on new metrology. Granite surface plate, 10th dti's and new stands to hold the DTI's.I have a saying, "YOU CANNOT MAKE IT, UNLESS YOU CAN MEASURE IT"!Each time you need to go smaller, the job intensifies exponentially along with a hundred associated problems, (like heat and dirt).I would love to have seen the machines they use for polishing those gauges and what grits are required. Maybe Don could explain all of that later on after all, it where you go when your a grinder. To get fine finish.LOVED THIS VIDEO.
In case you're wondering, it's 68 F because 20 C. Not only does the insulation protect against heat, but also sound and vibration. Most likely spun glass sound batting in there somewhere.
I really enjoy your behind the scenes tours of various businesses supporting the machinery and instrumentation used in industrial machining and grinding. Thank you for taking the time to produce this video. Regards, Paul
You're welcome! We're glad you enjoy the tours, a lot of other seem to enjoy them as well. We have a few other ideas we're trying to put in motion right now, we'll see what happens!
What fantastic history between A.A Jansson and Henry Ford and it is really mind blowing getting your head around the tolerances that are maintained. I have a set of AA blocks in metric and I now know just how much they can change in different temperatures. I only use mine for setting angles with my sine bar and checking my micrometers against the standards that come with them. A most interesting video enjoyed it immensely. Dave
Lovely vid. iv had the unfortunate pleasure of working with people that use gauges blocks as clamps, Iv seen them being milled/drilled and once someone welding one to a bench!!.. It used to break my heart knowing the care and quality that would of gone into making them. We have a few AA Jansson gauge sets in my old shop over here in England and all i know is that there really really old but still top quality still to this day.. . Top job really liked this vid right up my street.. Thanks
Fascinating insight into the subject - now I want one! Would also be interesting to see how they measure to such tolerances, and the physics behind it.
I work in the electronics industry, and we work with similar levels, perhaps even more, care in the environmental issues, with things like positive pressure clean rooms, 0.5°C temperature control, "airlocks" where one enters a first-level clean area, and put on tyvek suits, booties, hair nets, before entering our test area... And that's just in the printed circuit business ! Semiconductor manufacturing goes another order of magnitude. That said, it's clear that these people really care about the accuracy and stability of their products and work, which, indeed, form the basis of modern industry! So, thanks for the tour, and, if possible, it would be very interesting, to some of us, to see how they recondition surfaces, in detail, and maybe a bit more depth on the measurement equipment, itself, for those of the audience who work at similar precision levels.
Just got a book on dimensional meteorology and love it so far. It's amazing how far we have come and I love seeing this behind the scene stuff. It's an eye opener. Good video. Best Matt
Very interesting video you have offered us. Thank you! Most kind of Jansson's folk to bring you inside to show us the work they are doing. Enjoyed and appreciated here.
Super cool video Don...I work with tight tolerances and let me tell u...we take good care of our Gage block sets...very interesting to see what they do when we send them out for calibration...had no idea...the begining of the video shared some very cool history that I didn't know as well...thanks for the upload Don... your sense of humor and spirit is what keeps me watching your channel...Thanks again Boss
Don! this is one of the best yet, truely vast amount of information. I personally don't know why or what would need that close of measurement. None the less it good to know that there a way to measure something that small. thanks you for sharing your knowledge and the people who share their knowledge with us. greatly appreciated!
Thanks for this, really enjoyed seeing some behind the scenes of the steps to maintaining high precision. I really enjoyed the field trip to the machine rebuilding facility you did before. Just found your channel within the past few days, great content that nobody else is doing, thanks for your efforts to share and pass on this knowledge and experience.
Fascinating video, as all your videos are, Don. We could have done with a close-up of exactly what goes on in the reconditioning room. I could partly see what I guess was a worker polishing the gauges on a lapping plate of some description, but it would have been good to have elaborated a bit further on this process, and to have shown exactly how they polish the business ends of , for example, a 12" block and how they keep them parallel during the process. I can appreciate that this might have been considered classified info by the company, however.
Thanks for taking us along on this field trip Don! I always wondered what and how a calibration company used to reference the blocks that they are calibrating. It's was fun learning the History of the "Jo" block and their ties to CEJ and FoMoCo. Thanks again!
Very interesting... the talk about the temperature in the primary lab: did the temperature change much with 3 people in the lab conpared with only one person?
Excellent video Don , i never knew that gauge blocks could be reconditioned . I wonder if having two extra bodies in that inspection lab caused a temperature spike ! I would fall asleep doing that kind of work , those ladies must have a lot of patience and concentration to do that day in day out !
It did indeed! It was small, but we weren't in there long so it regulated quickly and didn't have an effect. We did take that into consideration while filming as well!
I would be interested to know more about the advantages and disadvantages of the various block materials. I think realistically anything past .0001" is beyond the realm of most shops since they lack the environment to be able to verify what they measure.
"Steel gage blocks are usually used on shop floors and will usually wear quicker than other materials, but they are cheaper to buy. Tungsten Carbide blocks are harder and will outwear steel gage blocks, usually used in grind shops. They also will not rust or corrode, but they do chip pretty easily. Ceramic is similar to Tungsten; they will outwear steel blocks and will not rust or corrode. Chrome Carbide will outwear all blocks mentioned above and will not rust or corrode either, but are expensive. It really depends on what you are using them for and your environment. There is a coefficient of thermal expansion, but unless you're measuring in millions of microns it will be considered insignificant to the quality technician." - Justin Frazzini, A.A. Jansson
Sure did enjoy the video Don. My only complaint is that now I want to track down an old set of Ford/Johansson gage blocks for my collection. Keep up the great work on the videos Don and company!
Very fun. I work in a DNA lab, very interesting to see the similarities and differences. For what it is worth, a millionth of an inch is about 25.4 nanometers. In other words, it is in the wavelength of ultra-violet light, and comfortably above x-ray wavelengths.
That was cool Don! Im curious as to why the sign in front of the lady cleaning said "gage cleaning" instead of gauge? Is that the way you guys in the US spell it? Loved the history behind it all. Thanks for sharing!!
If your blocks are calibrated by AAJ at 68 degrees how do you use them in your shop when the milling, grinding or lapping on precision parts is done at your shop temps and the coefficient of thermal expansion is quite large?
Good question! It depends on the material your using, for both the stock and gage block. For example, if you are using steel gage blocks and machining steel stock, both of which have been sitting in a shop at the same temperature, the stock and gage block will have the same coefficient of thermal expansion and it does not matter that the gage block had been calibrated at a specific temperature. But, if you're machining aluminum stock with a steel gage block and both have been in the shop at the same temperature, you will have to do some math to account for the minor difference in the expansion of the materials.
Hi Don, thank you for the show. Very interesting. I’d love to learn a bit more about the equipment used to measure those deviations. What kind of sensors do they use. What is the element touching the blocks made of, what kind of surface does it have and how are those calibrated.
According to Justin Frazzini at A.A. Jansson, a gage block comparator is used to measure the blocks. Justin was not comfortable sharing much past that.
"When handling [gage blocks], try to wear gloves if possible. Always clean the gage blocks before and after you use them, we suggest alcohol based cleaner or solvent. When not in use, make sure to store your gage blocks in their case. For steel or chrome plated blocks, lightly coat them with grease before putting them away. DO NOT use grease on Tungsten, Ceramic, or Chrome Carbide blocks." - Justin Frazzini, A.A. Jansson
A.A. Jansson has requested that we do not share the specifics of this part of the process, and we will respect that request. Sorry that we cannot answer it any further.
"If the gage block is oversized, we can lap them back into spec depending on how far they are out of spec. If a block is undersize, you could add more material to the block and bring it back into spec, but in the long run it's easier and cheaper to purchase a new block in both situations." - Justin Frazzini, A.A. Jansson
You missed telling the story of how C.E.Johanson in Sweden actually developed his method of producing extremely accurate gage blocks. I believe he took over his wife's sewing machine as part of his secret patented procedure.
You should try to explain manufacturing highly precise components to people who erroneously believe that a digital metric micrometer capable of displaying readings to four decimal places is accurate to that reading. The average job shop machinist rarely, if ever, manufactures components to a tolerance closer than +/- 0.005" or +/- 0.1mm. My manufacturing background is in the machining of components for scientific instruments and precision tooling where the tolerances were typically +/- half a tenth-thousandth of an inch and some critical components had tolerances to less than 10 millionths of an inch. This is very difficult and time consuming, requiring a controlled environment and strictly working to a sequence of operations with specific techniques. Even then, it is impossible to produce such high precision components without certified precision gage blocks.
My father trained to be a gauge maker at C E Johansson in Eskilstuna Sweden. He emigrated to the US in 1947. I still have many of the Jo Blocks, micrometers, calipers, dial gauges he brought with him to this country. Some day I would like to drop in on AA Jansson just to talk about the stories Dad had of working at C E Johansson. I myself took up the tool and die trade and currently work as a tooling engineer in the Detroit area. Thanks for the RUclips Video.
Kudos to you and A.A. Jansson for setting this up. My jaw dropped when I saw that pristine CEJ/Ford block set! The dedication and skill of the people at A.A. Jansson is wonderful to see. Thanks for this.
This is one of the best channels for anyone in the manufacturing industry. I have been in manufacturing for over a decade and an avid RUclips watcher. No other channel cover a wider array of behind-the-scenes topics. I always learn something new. Keep up the great work.
Thanks for the kind words, and thanks again for watching!
Thank you for this video. I remember when my father, who was a quality control engineer, came home and told us about learning how to use gage blocks and optical flats in the 1950's.
Awesome, now you know a little more about the history of them as well! Thanks for sharing, and thanks again for watching.
Hey Don,
Nice tour and video. Who would have thought it was all in a house basically. Thanks for sharing.
All the best,
Tom
Glad you enjoyed it, Tom! It's crazy to think the amount of precision that goes on in that house!
exactly my thought's - just wonderful.
Independent metrology studies brought me here. Such an inspirational practice when faced with chaos. Thank you.
i really like these field trips. :-)
I love the art of metrology , preciseness is managing entrophy.
Grtz from the Netherlands
Johny Geerts
Don, I find all your field trips fascinating to not only learn the history behind these companies, but to see what it actually takes for these companies to, get what they do, done. Millionths of an inch is really small, go watch "How thick is a sharpie mark?" On average a black sharpie mark with lines written on a gage block added 118 millionths of an inch to the gage block. So again one millionth of an inch is really small, you'd need to split that mark 118 times to get one millionth and a tenth indicator would only show roughly 1 and 1/3 lines on that indicator. That's intense. Thanks for sharing this Don, it really makes you think.
Right you are, thinking about things on such a small scale will make your head spin! I'm glad you enjoyed the video, thanks for watching.
Way to go, Don.
Too many of us in the precision trades think what is close enough for them is plenty close enough for the rest of the world. These days precision bearings (or any other item) made in Brazil have to fit a spindle made in Korea, which plugs into a headstock ... and so on to final destination from Paraguey to Perth to Pakistan.
What ever is made in house for in house can be made to any standard you wish. But soon as your stuff has to fit stuff made across the street an agreed on system of measures saves time, conflict, and money. That's where precision measurement references come in.
You and the people of A A Janssen illustrated the requirements and interdependence of the precision metalworkers of the world on well regulated international standards of measurement and made them understandable to the shop floor worker. And we got an industrial history lesson to boot. Many thanks.
You're spot on with your analysis. I'm glad you enjoyed the video, thanks for leaving us a message!
Thanks Don and AA Jansson.
A privilege indeed! Thank you for taking us there... Nice to have a peek at what it takes to work with metrology at this level.
This metrology game fascinates the life out of me. Even in England many old engineers refer to slip gauges (our term for the little blocks) as Joansson blocks. The name is respected within the engineering world.Being self taught, I started 17 years ago with a ruler, then a vernier, then a micrometer, then a 1/10 micrometer.All these were fine and dandy until I bought a small grinder and watched every Don Bailey video on grinding.It was Don Bailey that taught me everything about the little nuances of the strange world of the "tenth".Everything became 10 times more difficult than working in "thou's".I spent a small fortune on new metrology. Granite surface plate, 10th dti's and new stands to hold the DTI's.I have a saying, "YOU CANNOT MAKE IT, UNLESS YOU CAN MEASURE IT"!Each time you need to go smaller, the job intensifies exponentially along with a hundred associated problems, (like heat and dirt).I would love to have seen the machines they use for polishing those gauges and what grits are required. Maybe Don could explain all of that later on after all, it where you go when your a grinder. To get fine finish.LOVED THIS VIDEO.
We'll make a note of it! Thanks for the good comment, and thanks again for watching.
In case you're wondering, it's 68 F because 20 C. Not only does the insulation protect against heat, but also sound and vibration. Most likely spun glass sound batting in there somewhere.
I really enjoy your behind the scenes tours of various businesses supporting the machinery and instrumentation used in industrial machining and grinding. Thank you for taking the time to produce this video. Regards, Paul
You're welcome! We're glad you enjoy the tours, a lot of other seem to enjoy them as well. We have a few other ideas we're trying to put in motion right now, we'll see what happens!
As a swedish toolmaker by trade, that have used the CE J blocks, both in my education and work, this was an amazing history lesson. Thankyou so much!
You're welcome! We're honored to have been able to share this trade with you and everyone else.
What fantastic history between A.A Jansson and Henry Ford and it is really mind blowing getting your head around the tolerances that are maintained. I have a set of AA blocks in metric and I now know just how much they can change in different temperatures. I only use mine for setting angles with my sine bar and checking my micrometers against the standards that come with them. A most interesting video enjoyed it immensely.
Dave
It's truly a wonderful story. We're glad you enjoyed the video!
Very enjoyable to see that this kind of business and experts are still in demand. Thank you for sharing :)
You're welcome! Thank you for watching.
Thanks Don, GREAT video!!!!! Big thumbs up to you and A A Jansson . M.K.S.
Thanks! We appreciate your comment, and thanks again for watching.
Lovely vid. iv had the unfortunate pleasure of working with people that use gauges blocks as clamps, Iv seen them being milled/drilled and once someone welding one to a bench!!.. It used to break my heart knowing the care and quality that would of
gone into making them. We have a few AA Jansson gauge sets in my old shop over here in England and all i know is that there really really old but still top quality still to this day.. . Top job really liked this vid right up my street.. Thanks
Ouch, I'm cringing over here! Thanks for sharing, and thanks again for watching.
Fascinating insight into the subject - now I want one! Would also be interesting to see how they measure to such tolerances, and the physics behind it.
Great video.Very eye opening.I have never worked in a shop that had blocks to my memory ,sent in to be checked..
You should mention it! It's good to know that you're measuring tools are accurate. Thanks for watching!
I work in the electronics industry, and we work with similar levels, perhaps even more, care in the environmental issues, with things like positive pressure clean rooms, 0.5°C temperature control, "airlocks" where one enters a first-level clean area, and put on tyvek suits, booties, hair nets, before entering our test area... And that's just in the printed circuit business ! Semiconductor manufacturing goes another order of magnitude. That said, it's clear that these people really care about the accuracy and stability of their products and work, which, indeed, form the basis of modern industry! So, thanks for the tour, and, if possible, it would be very interesting, to some of us, to see how they recondition surfaces, in detail, and maybe a bit more depth on the measurement equipment, itself, for those of the audience who work at similar precision levels.
Just got a book on dimensional meteorology and love it so far. It's amazing how far we have come and I love seeing this behind the scene stuff. It's an eye opener. Good video.
Best Matt
We were very fortunate to get to see behind the scenes, I'm glad you found it as interesting as we did!
Metrology.
Awesome video, thank you for sharing. That Ford set was a work of art and I would be happy to own a set of them if they're even obtainable.
Thank you for watching!
These field trips are great... Hope you do more.
Very interesting video you have offered us. Thank you! Most kind of Jansson's folk to bring you inside to show us the work they are doing. Enjoyed and appreciated here.
We're very appreciative they allowed us to take the tour as well! Glad you enjoyed the video.
Super cool video Don...I work with tight tolerances and let me tell u...we take good care of our Gage block sets...very interesting to see what they do when we send them out for calibration...had no idea...the begining of the video shared some very cool history that I didn't know as well...thanks for the upload Don... your sense of humor and spirit is what keeps me watching your channel...Thanks again Boss
You're welcome! We appreciate you watching.
Thank you for the video!!!!
Yes, very interesting indeed. Thank you for doing the visit & interviews of those fine folks.
You're welcome, and thank you for watching.
a thing of absolute beauty
Thats for sure
Fascinating stuff!!! I love these field trip videos; thanks so much for making them :-)
We're glad you enjoy them! Thank you for watching!
very nice,i learned alot
I'm glad you learned something, thanks again for watching!
Don! this is one of the best yet, truely vast amount of information.
I personally don't know why or what would need that close of measurement. None the less it good to know that there a way to measure something that small. thanks you for sharing your knowledge and the people who share their knowledge with us. greatly appreciated!
Love it. Would like to see gauge block´s made, had hoped Jansson did that too. Kind regards Gert
Thanks for this, really enjoyed seeing some behind the scenes of the steps to maintaining high precision. I really enjoyed the field trip to the machine rebuilding facility you did before. Just found your channel within the past few days, great content that nobody else is doing, thanks for your efforts to share and pass on this knowledge and experience.
You're welcome, I'm glad you enjoy the videos. Thanks again for watching!
These videos are great!
Thank you so much for watching!
thank you Don for another great tour.
You're welcome!
Fascinating video thank you guys. I was hoping to see how they calibrate the ring gages too.
You're welcome, thanks for watching.
Fascinating video, as all your videos are, Don.
We could have done with a close-up of exactly what goes on in the reconditioning room. I could partly see what I guess was a worker polishing the gauges on a lapping plate of some description, but it would have been good to have elaborated a bit further on this process, and to have shown exactly how they polish the business ends of , for example, a 12" block and how they keep them parallel during the process.
I can appreciate that this might have been considered classified info by the company, however.
We withheld showing that particular part per request of A.A. Jansson.
really nice trip !
Glad you enjoyed seeing it!
That was educting! I wonder, would it be possible for you to visit a factory where lathe chucks are being made? That would be awesome.
We'll see what we can do, we have a few other ideas we're following up with right now.
Wonderful video Don. I very much enjoy the feild trip videos.
Thanks, we enjoy making them!
Another awsome field trip. Very neat to see this behind the scenes thank you again for sharing. Nice work.
Thanks for taking us along on this field trip Don! I always wondered what and how a calibration company used to reference the blocks that they are calibrating. It's was fun learning the History of the "Jo" block and their ties to CEJ and FoMoCo. Thanks again!
You're welcome! It was very good to learn about the history, we really enjoyed the trip as well.
Thanks for sharing with us this very informative video!
You're welcome, thanks for watching!
great. very interesting and informative. thanks. one less mystery in my world. thanks again.
You're welcome!
I would like to see the machining that goes into resizing a gauge block and the machines they use.
Per request of A.A. Jansson we will not be able to show you this specific part of the process.
A long time ago I worked at a small shop that had a Ford gage block set. Now I know more about where it came from.
Very cool! I wish I could get my hands on one but their few and far between these days.
Thank you Don, excellent video, very, very interesting....
Glad you enjoyed it!
Incredible. Insane. Absolutley love it.
Awesome job! Thanks for the video.
You're welcome, thanks for watching!
It would have been interesting to talk about the cost of calibration or replacement of a gauge block
While that wasn't the intention of this trip, our good friends at A.A. Jansson would be happy to answer that question for you. Give them a call!
Impressive,Thanks
Loved the field trip
Very interesting
Don thanks for the trip, I still want a tour of your shop.
It's in the works.
I recently acquired a 1.25" Johansson-Ford Dearborn gauge block, just the one, but I'm strongly considering framing it for my garage.
It would make a nice display!
GREAT VIDEO !!!
PS WHAT KIND OF FINISH RINGS TOGETHER , SUPER FLAT IS A GIVEN . I.E. .1 MICRON OR 15 MICRON ??
It would be interesting to see how the gauge blocks are made in the first place.
Yes it would be
Thanks for sharing.
You're welcome! Thanks for coming back to watch.
Thank you for sharing! great video.
You're welcome! Thanks again for watching.
Very interesting... the talk about the temperature in the primary lab: did the temperature change much with 3 people in the lab conpared with only one person?
It did change, but not by much. We took this into account and were in and out fast!
Is there an air lock between the lab and the entrance to the room?
Really enjoyed this video Don. I have wondered how how this was done. Thanks
You're welcome, glad to have helped!
Actually the friction of the blown air molecules through the hvac system will cause slight deviations if not realized.
I have a nice set of gage blocks that are labeled C.E..Johansson / Brown and Sharpe. Picked them up for $25.00!!
That's a great deal!
Great video, fascinating
Thanks!
Great Video...Very informative: Thank You!
Excellent video Don , i never knew that gauge blocks could be reconditioned .
I wonder if having two extra bodies in that inspection lab caused a temperature spike !
I would fall asleep doing that kind of work , those ladies must have a lot of patience and concentration to do that day in day out !
It did indeed! It was small, but we weren't in there long so it regulated quickly and didn't have an effect. We did take that into consideration while filming as well!
what a treat!
Most educational. I'd LOVE to see a similar video on the measuring instruments themselves. How do they sense length to the nearest .000001"?
We've made a note of it, we'll see what we can do.
I would be interested to know more about the advantages and disadvantages of the various block materials. I think realistically anything past .0001" is beyond the realm of most shops since they lack the environment to be able to verify what they measure.
I've sent a message to A.A. Jansson for a little more information.
"Steel gage blocks are usually used on shop floors and will usually wear quicker than other materials, but they are cheaper to buy. Tungsten Carbide blocks are harder and will outwear steel gage blocks, usually used in grind shops. They also will not rust or corrode, but they do chip pretty easily. Ceramic is similar to Tungsten; they will outwear steel blocks and will not rust or corrode. Chrome Carbide will outwear all blocks mentioned above and will not rust or corrode either, but are expensive. It really depends on what you are using them for and your environment. There is a coefficient of thermal expansion, but unless you're measuring in millions of microns it will be considered insignificant to the quality technician." - Justin Frazzini, A.A. Jansson
SuburbanTool Inc
Thank you very much for the response!
Sure did enjoy the video Don. My only complaint is that now I want to track down an old set of Ford/Johansson gage blocks for my collection. Keep up the great work on the videos Don and company!
Oh I would love to have a set like the one at A.A. Jansson, it's truly a one-of-a-kind piece. It was amazing to see in person. Thanks for watching!
I loved it !
Great! Thanks again for watching.
Do they do the figure-8 superfinishing move?
Very fun.
I work in a DNA lab, very interesting to see the similarities and differences.
For what it is worth, a millionth of an inch is about 25.4 nanometers. In other words, it is in the wavelength of ultra-violet light, and comfortably above x-ray wavelengths.
Wow, very small. Thanks for sharing! We really appreciate it.
That was cool Don! Im curious as to why the sign in front of the lady cleaning said "gage cleaning" instead of gauge? Is that the way you guys in the US spell it? Loved the history behind it all. Thanks for sharing!!
Yes, that's how they are referred to here. You're welcome, thanks for watching!
If your blocks are calibrated by AAJ at 68 degrees how do you use them in your shop when the milling, grinding or lapping on precision parts is done at your shop temps and the coefficient of thermal expansion is quite large?
Good question! It depends on the material your using, for both the stock and gage block. For example, if you are using steel gage blocks and machining steel stock, both of which have been sitting in a shop at the same temperature, the stock and gage block will have the same coefficient of thermal expansion and it does not matter that the gage block had been calibrated at a specific temperature. But, if you're machining aluminum stock with a steel gage block and both have been in the shop at the same temperature, you will have to do some math to account for the minor difference in the expansion of the materials.
how are the blocks made from stock to assure dimensional stability (stress relieving) ?
Hello sir,
How are you??
You didn't made any field trip videos in 2017???
Hi Don, thank you for the show. Very interesting. I’d love to learn a bit more about the equipment used to measure those deviations. What kind of sensors do they use. What is the element touching the blocks made of, what kind of surface does
it have and how are those calibrated.
We've sent your question over to our friends at A.A. Jansson for review and a detailed response.
Awesome! Thank you.
According to Justin Frazzini at A.A. Jansson, a gage block comparator is used to measure the blocks. Justin was not comfortable sharing much past that.
Currently channels are running series on surface plate support. How are your plates supported at Suburban if I may ask?
Dennis L.
What is the best way for us amateurs to maintain and protect our gage block sets?
We have practices that we use, but I have sent your question to A.A. Jansson to see what they recommend.
"When handling [gage blocks], try to wear gloves if possible. Always clean the gage blocks before and after you use them, we suggest alcohol based cleaner or solvent. When not in use, make sure to store your gage blocks in their case. For steel or chrome plated blocks, lightly coat them with grease before putting them away. DO NOT use grease on Tungsten, Ceramic, or Chrome Carbide blocks." - Justin Frazzini, A.A. Jansson
What actually measures the gage block. who makes it and how does it work?
A gage block comparator.
What are the master sets made from?
Some sort of ultra low COTE ceramic?
How do you use a gauge block and spell the cigarette paper that is 1000/inch...?
if the gauge block is oversized, is possible to grind or lap them into spec? what do you do if they are under?
A.A. Jansson has requested that we do not share the specifics of this part of the process, and we will respect that request. Sorry that we cannot answer it any further.
"If the gage block is oversized, we can lap them back into spec depending on how far they are out of spec. If a block is undersize, you could add more material to the block and bring it back into spec, but in the long run it's easier and cheaper to purchase a new block in both situations." - Justin Frazzini, A.A. Jansson
HOW precise you trying to be? make transistors the size few atoms.
If we needed to, we could measure it ;)
Why wouldn't they use ceramic, glass, or optical standards?
love it
We're glad, thanks for coming back to watch.
how thick is a fingerprint?
I don't think they know. I never saw them touch one! ;)
we used to joke about breathing and changing a mic reading by two tenths..........that is some tight stuff there!
Ha!
What does it take to make a complex part within 1 millionth
Damn is 1 millionth really close to molecular?
Practice!
Use a sharpie on a granite block that's about 2-4 millionths
Great! Now I know how to calibrate my gage blocks at home! (As if...) 8^)
If only it was that easy!
😍
Always wondered how the accuracy is checked on a gauge block. Now I know. How much do they cost about a dollar a piece. Lolol
Something like that ;) Thanks for watching!
You missed telling the story of how C.E.Johanson in Sweden actually developed his method of producing extremely accurate gage blocks. I believe he took over his wife's sewing machine as part of his secret patented procedure.
I believe we covered that story in this video ruclips.net/video/2J8iNGQJGHA/видео.html
Thank you for watching.
Just as well no one sneezed :-)
You should try to explain manufacturing highly precise components to people who erroneously believe that a digital metric micrometer capable of displaying readings to four decimal places is accurate to that reading. The average job shop machinist rarely, if ever, manufactures components to a tolerance closer than +/- 0.005" or +/- 0.1mm. My manufacturing background is in the machining of components for scientific instruments and precision tooling where the tolerances were typically +/- half a tenth-thousandth of an inch and some critical components had tolerances to less than 10 millionths of an inch. This is very difficult and time consuming, requiring a controlled environment and strictly working to a sequence of operations with specific techniques. Even then, it is impossible to produce such high precision components without certified precision gage blocks.