I wonder if you realize that for every kid you taught in school, there are probably about 1,000 youtubers learning from you today. Thanks from all of us.
Back in the 1960s a friend produced movies for the Veterans Administration. In a film about blind veterans, he had a sequence of a blind quality control inspector who determined roughness with his fingertips using a plate.
Profilometers are often used to measure the roughness, the avg(Ra) the peaks(Rp) and the valleys(Rv), of the decks of an engine block and it's associated cylinder heads after they've been resurfaced. Some cylinder head gasket manufacturers require a certain finish in order to maintain a seal with their gasket.
Long ago I tried an experiment of testing surface roughness using my fingernail and realized it was the sharpness of my nail that was the biggest limiting factor of how sensitive that method was. I had a fairly long thumbnail at the time so I stuck a sharp needle through it and used the tip on the needle as my probe. Let me tell you the difference was astounding! If you don't have any long nails and want to try this you can just as well epoxy (or other very hard glue) glue a sharp needle to your nail for a quick investigation of the physical dynamics of the system. If you are at all into surface texture, I bet you will enjoy it. HA! I should have listened to the whole video before commenting. Good one. :-)
This is fascinating - I really appreciate your making these videos. I am aware of the Cat engine surface finish requirements for the crankshaft etc. but as a commissioning engineer I don't have to measure or directly deal with that. That is way above my pay grade LOL!
Interesting video Lyle, but then yours usually are. I'm commenting because my job as an external and internal grinder involved using these. We made turbochargers and the bearing surfaces on some of our products had to be either 8 or 12. So I have used that very same machine 100s if not 1000s of times. Remember I had to stop work early aged 43 when my lower back wore out, but I did that job for 16 years. However you may have seen over the last year I still manage to maintain the skills of an engineer e.g. making the model steam engine, plus other projects that I do.
Mr. Pete, as usual, always interesting never boring and always educational. Are you taining an apprentice? The end of 'Mr. Pete' videos would have a very significant impact on the RUclips community out here!!! Many thanks for sharing young man. Regards. Joe.
Thanks for the video, and basically everything ! As a home gamer, and a neophyte one at that, I often wonder what the surface finish can tell me about my cutting speeds/feeds, or bit sharpness, perhaps even the quality of the metal. Its pretty hard when starting out, and you don't have a seasoned vet over your shoulder to interpret the results.
Better way to compare surface finish using the GE style samples, is by scratching both surface with your fingernail. The difference is quite obvious, and in my personal experience, is more accurate than visual.
This was a great video with roughness or smoothness "Surface Roughness Scales" as a shop-floor tool. Thanks for the help! T J (Tom) Vanderloop, Author, Technology-Instructor & Consultant to Manufacturing; ATEA, AWS & SME
Organic manufactured products consist of atomic scale additive processes. Of course it's going to look better than anything produced by macroscale subtractive methods. Once nanoscale tools are as common and affordable as lathes and milling machines then what we manufacture will rival and exceed that of nature. I hope that day comes in my lifetime.
@mrpete222 Did you think to try your endoscope to look at the vinyl record? It should have a much shorter focal point and should afford you a more close-up picture. Probably at a lesser resolution than your normal camera however.
This is a very interesting subject for sure! Can't wait for part 2. Not sure about milling, but for turning you can calculate the surface roughness. If you know the target roughness in Ra, insert radius and/or the feed. You need know atlest 2 then you can calculate the 3rd. This calculation is in metric values. So if the blueprint would call for surface finish of say 1,6Ra and you would use an insert with a 0,8 noseradius then the math would look something like this: Feed pr rev = Square root(0,016*32*0,8) = 0,202 Ra is in microns so that needs to be coverted to mm, so 0,016. The 32 is a constant. 0,8 is the noseradius. There is more factors that influence surface finish obviously but this should put you quite close to you target.
Wonder how they made those GE roughness gauges, they don't appear to have the individual tiles soldered together but I wouldn't think it could be cast with that much detail.
It matters to ultrasonic inspection i need my company to better there machining..i need to show them what i need for better results because i am the inspector that effects the surface of inspection i need the machine inserts to cut very fine no record grooving this make a wave that increases the amplitude of my ultrasonic response that is un acceptable to my inspection ...
A question for whoever can answer. I have a pair of the GE Roughness Scales and I'm curious as to what they are made out of. Because there is green spots pitting the metal like it's tarnishing. And it's magnetic and they have a good bit of weight to them. It isn't that bad I'm just curious. I do use them. But they were like this when I got em. And if anyone has an idea on how to stop the tarnishing plz let me know thx. I used some silver polish on em and it worked pretty good they are nice and shiny. Just one has green little spots on it the other just has a few.
If you are interested in inspecting specific surface defects you can buy surface defect blocks. Very interesting tool www.carbideprobes.com/surface-defect-evaluation/ I deal with alot surface roughness inspections and just found out about this tool.
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I wonder if you realize that for every kid you taught in school, there are probably about 1,000 youtubers learning from you today. Thanks from all of us.
No doubt!
Thank you for the videos!
loved the comment of magnification and the difference btw man made and nature. it`s priceless! i will tell my kids today. thanks for sharing sir
Back in the 1960s a friend produced movies for the Veterans Administration. In a film about blind veterans, he had a sequence of a blind quality control inspector who determined roughness with his fingertips using a plate.
Profilometers are often used to measure the roughness, the avg(Ra) the peaks(Rp) and the valleys(Rv), of the decks of an engine block and it's associated cylinder heads after they've been resurfaced. Some cylinder head gasket manufacturers require a certain finish in order to maintain a seal with their gasket.
Thanks
Long ago I tried an experiment of testing surface roughness using my fingernail and realized it was the sharpness of my nail that was the biggest limiting factor of how sensitive that method was. I had a fairly long thumbnail at the time so I stuck a sharp needle through it and used the tip on the needle as my probe. Let me tell you the difference was astounding! If you don't have any long nails and want to try this you can just as well epoxy (or other very hard glue) glue a sharp needle to your nail for a quick investigation of the physical dynamics of the system. If you are at all into surface texture, I bet you will enjoy it.
HA! I should have listened to the whole video before commenting. Good one. :-)
This is fascinating - I really appreciate your making these videos.
I am aware of the Cat engine surface finish requirements for the crankshaft etc. but as a commissioning engineer I don't have to measure or directly deal with that. That is way above my pay grade LOL!
Interesting video Lyle, but then yours usually are. I'm commenting because my job as an external and internal grinder involved using these. We made turbochargers and the bearing surfaces on some of our products had to be either 8 or 12. So I have used that very same machine 100s if not 1000s of times. Remember I had to stop work early aged 43 when my lower back wore out, but I did that job for 16 years.
However you may have seen over the last year I still manage to maintain the skills of an engineer e.g. making the model steam engine, plus other projects that I do.
Thanks for watching
Mr. Pete, as usual, always interesting never boring and always educational. Are you taining an apprentice? The end of 'Mr. Pete' videos would have a very significant impact on the RUclips community out here!!! Many thanks for sharing young man. Regards. Joe.
THANK YOU very much!!!
Thank you for taking the time to make this. Very helpful!
Great video on roughness. My stuff is never a 4. Keep on keeping on.
i wonder how GE made those tools? Very interesting video, thanks.
This makes ultrasonic response high in amplitude a reject high surface response in amplitude in the inspection.
Thanks for the video, and basically everything ! As a home gamer, and a neophyte one at that, I often wonder what the surface finish can tell me about my cutting speeds/feeds, or bit sharpness, perhaps even the quality of the metal. Its pretty hard when starting out, and you don't have a seasoned vet over your shoulder to interpret the results.
Better way to compare surface finish using the GE style samples, is by scratching both surface with your fingernail. The difference is quite obvious, and in my personal experience, is more accurate than visual.
This was a great video with roughness or smoothness "Surface Roughness Scales" as a shop-floor tool. Thanks for the help!
T J (Tom) Vanderloop, Author, Technology-Instructor & Consultant to Manufacturing; ATEA, AWS & SME
Thank you very much
1:10 Amen those are called fractals and roughness is a big part of fractal geometry!
Organic manufactured products consist of atomic scale additive processes. Of course it's going to look better than anything produced by macroscale subtractive methods. Once nanoscale tools are as common and affordable as lathes and milling machines then what we manufacture will rival and exceed that of nature. I hope that day comes in my lifetime.
Great knowledge I can learn here. Thank you!
Thanks
always fantastically educational
what is the best method to get the best quality surface finish on sand castings? Using fine sand obviously helps but are there any other methods?
I find it very very interesting keep up the good videos.
Smooooth presentation
Another great video! Thank you Mr. Pete!!
Great Lyle !....I am ready for 650 more ....don't slow down....Jeff
There's never enough Mr. Pete! It's like an addiction; only a good one!
ABSOLUTELY AGREE!
THANK YOU very much!!!
@mrpete222 Did you think to try your endoscope to look at the vinyl record? It should have a much shorter focal point and should afford you a more close-up picture. Probably at a lesser resolution than your normal camera however.
This is a very interesting subject for sure! Can't wait for part 2.
Not sure about milling, but for turning you can calculate the surface roughness. If you know the target roughness in Ra, insert radius and/or the feed. You need know atlest 2 then you can calculate the 3rd.
This calculation is in metric values.
So if the blueprint would call for surface finish of say 1,6Ra and you would use an insert with a 0,8 noseradius then the math would look something like this: Feed pr rev = Square root(0,016*32*0,8) = 0,202
Ra is in microns so that needs to be coverted to mm, so 0,016. The 32 is a constant. 0,8 is the noseradius.
There is more factors that influence surface finish obviously but this should put you quite close to you target.
Wonder how they made those GE roughness gauges, they don't appear to have the individual tiles soldered together but I wouldn't think it could be cast with that much detail.
I want part 2 now! Lyle please!
I once read that a human finger tip's ridges are sensitive enough to detect a single hydrogen atom bonded to a perfect silicon crystal flat surface.
Very insightful.
Mr Pete - have you ever thought about how one of those metal roughness gages were made? How in the heck...
???
why dont they have one for the vertical sheer tool ?
Thank you
Fascinating, thanks!
How to get the best surface no waves
It matters to ultrasonic inspection i need my company to better there machining..i need to show them what i need for better results because i am the inspector that effects the surface of inspection i need the machine inserts to cut very fine no record grooving this make a wave that increases the amplitude of my ultrasonic response that is un acceptable to my inspection ...
Very informative. Thank you for sharing.
CAN YOU MACHINE A 16 FINISH ON A LATHE
Thanks :)
Rough-smooth or rough-unrough?
A question for whoever can answer. I have a pair of the GE Roughness Scales and I'm curious as to what they are made out of. Because there is green spots pitting the metal like it's tarnishing. And it's magnetic and they have a good bit of weight to them. It isn't that bad I'm just curious. I do use them. But they were like this when I got em. And if anyone has an idea on how to stop the tarnishing plz let me know thx. I used some silver polish on em and it worked pretty good they are nice and shiny. Just one has green little spots on it the other just has a few.
Nickel is also magnetic. I suspect the samples are made via electric plating process, like how the master molds are made for vinyl records
I thought nickel also but it would need to be solid nickel because some of the pitting on the back is pretty deep.
Thanks for replying!
A few of the samples look like they were produced by a shaper or a planer.
I would imagine engraved
Wheres part 2?
subscribed!
👍👍
I bet that was a Georgia Gibbs record.
Ray Price! ;-)
If you are interested in inspecting specific surface defects you can buy surface defect blocks. Very interesting tool
www.carbideprobes.com/surface-defect-evaluation/
I deal with alot surface roughness inspections and just found out about this tool.
A vinyl music record has only one groove.
two!
Unless your kids get a hold of it; then it has a couple hundred!
To those who disagree there's only one groove (per side) on a vinyl record, please elaborate.
Yan Wo
Don't know about kids eh? They can grove stainless....
Why 63 and not 64?
Yan Wo ~125/2
Can you leave gods out of the discussion?
First comment?
sir , please always wear gloves while dealing with unfinished machined metal component.
The sharp edges
Your incorrect comment about gods creations being perfect couldn't be farther from the truth.
Only if you're a lieberal...
I searched through the comments section as soon as I heard him say it just to see what triggered responses I could fine. Lo and behold.