Pitch Diameter, Wires and Numbers Galore. Threads in detail !
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- Опубликовано: 16 окт 2024
- Did you ever look at a thread chart in a machinist handbook and wonder what all the numbers are? Did you ever try to measure a thread and find out the guy before you lost a wire? Take a look at this video for some answers and tricks.
Another "Amazing!!!" class Professor Pie. I am so thankful to you for doing this. I'm in school at 46 years old in a wheelchair to boot and I have learned more from how you teach than from my instructors. My time on my lathe is far more productive. I will need to turn A & B threads class 3 like your showing that will need to withstand high pressures. I'm green but learning much faster with your help. God Bless you brother!
Glad to help. Good luck with the schooling. Maybe you should tell your instructors about my channel??
I like what I just saw! (as you asked it). Your videos are top notch and will serve many, many machinists for many years to come. They have certainly helped me.
Good to hear Jim. Thank you.
I have been cutting threads a while and I have never seen or thought of the one wire method. Thanks Joe.
Try it, then compare to your 3 wire measurement. Bet you they are the same.
Yes it is a very effective fast and accurate. That is one of the best ideas I have gotten on youtube. Big thumbs up. My pint is tipped in your direction.
Much appreciated Sir.
Thanks for the video, Joe. Every time I watch your channel, I learn something! Thanks for sharing your expertise.
Outstanding. Now go and teach someone else.
I do just that, Joe. We have a Machinist Club meeting each month, and I always discuss you tips and videos.
Thank you. Any of your guys ever subscribe?
One-wire measurements. Of course! That, sir, is brilliant.
Does make it easy. Thanks.
There are a ton of videos on threading but now i finally understand how to do it right. Thanks for the tip from the last video with the inverted tool, I will never thread the old way again. So much less stress!!
Its the best kept secret in the machining world. At least it used to be.
Hi Joe really enjoyed your thread video well explained keep it up
Thank You Joe!! Just got my wires the other day and was looking for a detailed description on how to use them. I did a search for you and your thread vids and found this one. I am headed out to the shop to try the one wire procedure on a part with 1-5/8"x16 thread for multiple parts. I am new at this stuff at almost 70yrs old and grateful for your knowledge. I love the way you tackle things!!
Very good information, Joe. Thanks for taking time to explain how to make our work much better (more precision) and I think easier.
I may go overboard sometime, but I am a firm believer in doing it right, and one time. Thanks for watching.
Well done Joe! This one goes in the favorite list for future reference.
Good details in this one. Thanks for watching
thanks joe, that was a tricky topic but you explained it well and didn't dumb it down.
Joe your advice on threading has been a big help I can't thank you enough
Good to hear. Thanks
Thank's Joe Teaching is a lot of work for sure.I got a lot out of it though and thoroughly enjoy your teaching style .You are definitely one of the best on U Tube who makes a complex subject achievable for an average guy
Thats an awesome compliment. Thank you very much.
norman feinberg ... i agree great teaching style... he can make a beginner understand
Thank you very much. You guys don't realize how much these comments mean to me. I am glad to help.
Your instructional videos are great. Just getting into running threads on my new lathe and you've already saved me a lot of heartache.
Looking forward to B class threading videos. I am making a plug gauge and watched this video again. I started using the wrong set of numbers and remembered you saying "Don't use A class for a plug gauge. thanks for saving my butt.
Thanks for all your videos Joe. Big Fan!
I'm fairly new to this and already you have saved me several hours with your various videos. With all the thousands of views your videos have I wonder how many hours you have saved all the people watching? maybe a million? maybe more? IDK but THANK YOU VERY MUCH!
Thanks for watching. I hope they do help.
Joe, After watching the video and attempting to do the measurements, they did not come out correctly. So I watched the video again and took notes and was able to make it work! Thank you for the explanation. I then decided I needed a cheat note to be able to do this 2 months down the road. I came up with some drawings/worksheets that help me see it and the numbers needed, for the next time. I would be happy to share them with you if you like. Not sure how I could get them to you, but if you are interested, let me know. Thanks again for all the videos that share your knowledge!!
Hi, Dick! I'd be happy to use your cheat sheets! Please email to miched2@gmail.com Kind regards. Mike
That was a class-3 explanation, Joe.
It might clearer to some to say that the pitch diameter is that diameter where the width of the thread is equal to the width of the space between two threads. You said that in a different way, I think.
A very valuable lesson.
I don't think that is true. The gap depends on the class of fit. A normal thread will have a bigger gap than the throat at the pitch diameter so there is some space between the threads. If they were equal there would be no gap and the thread would not fit.
Sorry, Barry, I probably said that wrong. I didn't mean the space between mated threads; I meant to refer to the external threads on the screw. The basic pitch diameter is the diameter of a theoretical coaxial cylinder whose surface passes through the thread at the point where the gap width is equal to the thread width. The gap width is one-half the pitch, and the thread width is one-half the pitch.
The pitch diameter obtained from measuring over the wires is compared to the pitch diameter of the nominal size to check that it is within tolerance for the class fit specified for the application.
You're quite correct that if there were no gap between mating threads they would not assemble, and, as you note, the gap depends on the class of fit.
Hi Richard. You have shared a detail I was never aware of. I will have to read these comments a few times and draw it, but thank you for sharing that. I will digest Barrys comment as well.
hey prof joe that video rates two thumbs up. probably the most complete discussion on thread classes i've ever seen. i really liked your one wire technique. i may retire my collection of thread nuts now. my thread nuts were all made from hex stock using taps. i was told by an old timer years ago that if you checked the thread class on the tap you could get away with this.but then all our customers were in the steel mill where we worked. can't wait to try the one wire technique. thanks joe.
Thanks for watching. Good luck.
great video as always. For a future episode I would love to see design and use of a plug gauge for verifying internal threads. keep up the awesome work!
When the opportunity presents itself, I'll film that. Thanks for watching.
Thanks for the education, Joe. I have long wondered why three gages, when one seemed to provide the same information, as you so aptly demonstrated. Nice to finally put that quandary to rest.
I'm glad you mentioned running in reverse when sanding the burrs off the thread. I can't tell you how many times I've taken that operation for granted and gotten my finger sucked down into the hole. Fortunately I still have all my digits.
Watched this video when it first came out and now back again for a refresher because I have a critical to me cyl. rod threading job for my sons backhoe and want to increase my threading skills. Thank you, Ed
Best practical explanation I have seen! Thanks for sharing.
Had to come back for a refresher after your latest video. Worth every minute! Thanks for making these educational videos!
Thanks for your video Joe. I just took a new job today measuring Precision threads for a company that makes ring gauges and plugs gauges. It's my first time doing this kind of work and I'm still pretty lost so I looked up videos to help me learn. I learned a couple of things from your video and I appreciate it. Thanks again
Thanks for watching. I would hope that company also has a bunch of overlays and a big comparator. Good luck.
Commence to find out they do have the aforementioned equipment. They've been in business since 19 and 56.
You videos are fantastic, your method of teaching is spot on. Thank you for your time.
This is the one I was looking for! Thank you for taking the time to post this. I just got my first set of wires and was a little unclear on the add and constant value usage. This cleared it up for me. I am a maintenance "machinist". I make parts for our factory machines, but I am certainly not a journeyman level by any means.
The guy I replaced (due to retirement) would always make an internal thread in something to gauge the external on the part. That's fine if you are making your own mated pieces, but not always so good if you need to mate to an externally sourced piece.
In all fairness, he taught me a lot, but had his own way. Anything else just wouldn't work.
I've been binging your videos now that I am on my own and have the shop to myself. Thank you for continuing my education.
Glad to help. Get yourself a machinery handbook.
@@joepie221 Have 2 actually. One of my own and one at work.
I also tried out your upsidown threading on the lathe today. I recently upgraded my tool post to an indexable Aloris quick change which made it possible. Didn't have the vertical adjustment with the old Dorian. Just have single point cemented carbide for threading tools, so I reversed my compound angle and did it the way I was used to using the 29 degrees on the compound zeroed cross slide and advancing with the compound, but it worked out well. Also used the opportunity to try out the single wire method. Man that was easy.
Again, thanks for taking the time to post all of these.
I¨m currently threading 2 x16 un on aluminum. Been some years that I´ve done some threading. Your vid really helped. Keep up the great work Master Joe!
Best explanations on threads I have watched.
I work for the US Navy as a civilian machinist, and I NEVER thought of using one wire!!! But as soon as you started explaining I knew exactly where you were going with it, and I thought DUH!!! what an idiot I have been all these years...HOWEVER, the machine shop work lead and supervisors all say IT HAS TO BE DONE THE WAY WE HAVE ALWAYS DONE IT and I doubt they would accept the single wire method...even if I PROVED it to be accurate. It is f=definitely going to be a method I use for myself and then let the work lead use all three wires to verify for me when they do a first part check...tee hee hee!!! Thanks Joe!!! I LOVE your tips and hints and tricks...been watching you for years...
Thanks for the long term support. One other benefit of a one wire method is that you can check if the thread groove is concentric to the OD or crest of the thread. A perfectly cut thread will measure spot on with 3 wires, but still not engage the mating part if the thread is out of concentricity. And you'll never know.
Most useful Joe -- always something new to learn or -- remind me of something long forgotten!! Single wire approach sure is easy when thinking about it. :)
Good point re the B class internals - very valid.
I've seen a lot of guys waste a bunch of time making gages to the wrong PD. Its not intuitive, but makes sense once you think about it.
Thank you Joe.
That is the best thread video I have seen. Well presented. I learned a lot and some of it was still over my head. Thank you
Thank you.
Joe, I have been a machinist for over 30 years and I have cut numerous threads. I too love my wires. the only problem i see measuring over one wire is its not a true pitch diameter. If you cut your part .005 under b4 threading , wouldnt you have to allow for 1/2 of that? Its easy to get a burr on a thread that would be misleading also. Sure 3 wires are hard to hold , but ive used a ball of putty, grease , and rubber bands or o rings to help hold my wires. I have plug gauges ive made that are double lead left hand stub acme. made using wires. I do enjoy your videos, keep up the great work!
machinistmarty
Was going to ask the exact same thing !
Although i do like the two wire method especially for initial setup but is it worth the effort ? I don't know , if for one piece maybe not but if you have to cut a few maybe.
Hi Guys. The starting OD of your part has no bearing on the target pitch diameter. Its just a tool to give you radius values to work from. If you measure parts with burrs on them , shame on you. Wipe the OD of your threads with a fine file and wipe them off with scotch brite before you try to measure them or put a gage on (or in). I usually grab 3 wires as well, but wanted to show, you really don't need 3. Thanks for the comment and for tuning in.
Since I thread with my cross slide and away from the chuck, the initial groove is always going to be there. the 2 wire measurement is always an option when you dont put in a thread undercut with a different tool.
I totally agree with you about pitch diameter, all i was saying is using one wire and measuring on top of the threads , i would think you would have to take the OD into consideration. With three wires you are measuring the pitch every time. And I always debur, lol. Once again,I do appreciate you doing these videos. I really liked the one on the way you set your compound on the lathe for a precision angle.
You always need to know the OD because you need the radius value for your final step. You do not have to make special allowances for an undersized OD since you are establishing the PD from the centerline of the part and not the opposite side. Its a bit tough to visualize, but draw it and stare at it for a minute. The light will come on. Thanks for your comments and questions. Keep em coming.
Thanks for the videos! I am just getting into hobby machining and would have been mislead very easily by many other videos on RUclips. Keep up the good work man
Glad to help
Thanks, Joe! Merry Christmas.
Merry Christmas back at ya. Thank you.
My third time watching this one .Great videos.Some of the best on the machinist channel.Thanks again for the hard work Joe
Thanks for your support.
Thanks Joe! Your tips are always useful for all of us out there in the REAL world.
Knew I'd seen the one wire method at some point !
Tried this today on a m42x0.75 with 0.18 wires... and a conversion chart for metric
The difference between the 3 wire method and one wire method, one involved grease on the wires swearing cursing and general frustration the other required 10 seconds of my time and both values were spot on ! What a time saver for the future !
And you'll have 2 spare wires if you drop one in the chip bin.
Thanks to your insistence on accuracy I bought a set of Pee Dee thread measuring wires, acme thread pitch gauge and an acme screw thread tool gauge for a project I'm working on.
Excellent description. Thank you Joe !
great video Joe. on a subject that is usually glossed over very briefly.
Fred , U.K.
True. There is a lot going on with a gage perfect thread. You don't see much of this in the classroom.
:) now my wire sets contain 2 spares of each size :) lol .
thanks a lot for the good information and videos. rgds michael, berlin, germany
Or you could give 2 sets away for Christmas. Regards from Austin Texas
Finally somebody who is as fanatic about threads as me. I have been threading upside down & backwards for 40 years.
Scoop out the chip pan before handling the wires. I use grease to hold the wires in place because I only have two hands. When making more than one or two parts that need thread wires I hold them together in the right position with masking tape. Back in 1991 on my first ship I had to use iron bailing wire to measure threads because I didn't bring my wires with me, had to calculate the measurement over the wires using right angle trig.
Do you remember when the Machinerys Handbook did not have tables for metric thread dimensions. I had to get my first copies of metric thread charts from the Landis Threading Handbook.
Fisher Tool, Hawthorne California (Pee Dee) will sell individual wires to replace lost wires.
Take a look at my wire video. Realistically, you only need one wire to check a thread. They give you 3 so you have 2 spares. Curious yet??
Keep the good videos coming Joe, thx a lot! I'm a selfe thought (almost) gunsmith here in Sweden and watch your videos with great interest! I fit barrels to both hunting and competition rifles and try to keep decent tolerances on my jobs. Your videos keep adding ideas an knowledge! :-) /Stefan in a cooold northern Sweden.
If you ever have a specific question, just ask. Try to stay warm and have a happy holiday. Greetings from Austin Texas USA.
That's a generous offer Joe! I'll keep that in mind if (when) I run in to trouble! :-) Hope you get at great Christmas and don't have to wear long-johns and clear snow like we do! ;-)
I lived in NJ for 37 years. Trust me...I've shoveled my fair share of snow. Not any more:)
Ha ha, vice move! I have a few shooting-buddies in Texas and they seldom talk about snow :-) Been living in my hometown for almost 50 y (since birth) but I dislike the cold more every winter :-(
Its amazing how our bodies adapt. I used to shovel snow at 30 degrees F with just a light t shirt and sweatshirt. Having lived withh 100+ temperatures for 20 years, I'm about ready to die if the temp hits 50. I'm glad I moved. If I want snow, I'll buy a plane ticket and go see it.
Joe I am a big fan, really enjoy your great presentations. The way that I approached the 3 wire balancing act is to put an O-ring on top and another on the bottom. I start off with a readily available metric O-ring assortment kit and pick 2 that just feel right. For the 3/4 - 10, this is an O-ring with an ID = 11.8 mm and OD = 16.6 mm.
Only use one, the other 2 are spares for when you drop one in the chip pan.
Very informative, thanks.
Thanks for watching.
Joe
Am the Master trying to teach the Apprentice. The Master knows no more than the apprentice.
Studied Machinery Handbook - lots of info -- good stuff for sure.
Watched all the videos I can find from Gurus.
The goal is to cut a lathe chuck adapter plate with 1.5 x 8 TPI. All of my practice so far has been just that - practice - on stuff I can scrap. Yup made my mistakes there.
Have concluded that I must cut a plug gage to get it right.
THANK YOU for telling me to cut the gage to the specifications for the class B (internal)
the light came on.
Dan Bentler
Seattle
Way to go Dan. Good luck with the gage and thanks for watching.
got tonnes out of it Joe. great as always
Thanks, and thanks for the sticker. It got here the other day. I have to return the favor when mine are ready.
Awesome tutorial thanks Joe!
...Next, can you show us how to turn progressive pitch threads.
The idea being - as the part is tightened the male part (ie: bolt) elongates under tension thereby disengaging most of the threads that would have had contact under no tension or torque.
The result being only a few (front or leading) threads of engagement carry majority of the load, while the trailing threads due to the part being stretched may not even engage at all...and so to speak "hang in the air."
This may not be critical if only pulling forces are placed on say - a bolt.
But if lateral forces are placed on a really long bolt such as a lever arm threaded into a hole, the front engaging threads could act as a fulcrum point since the trailing threads have no contact.
A crude example would be - Think of your lever for enaging the half nut, has only side forces. Full thread engagement would prevent it from loosening since that would reduce wiggling if only the first 3 threads are actually touching while the part keeps getting forced side to side.
Now multiply this event times 100 or even 10,000 vibrating at a harmonic frequency and since....everything is under tension---while wiggling around...you see what can happen to the few threads which do have engagement. - Or just the part keeps loosening.
One way I imagine would be to lap the threads in but....
---Is a progressive pitch thread possible on a Manual Lathe, or only CNC?
Thanks for any thoughts you have on this.
Hey Joe, Really liking the video series. Years ago I used an interchangeable anvil thread Mic. that was made by Tesa. It was an awesome tool. Not sure if they make it any more. But thought I would share that with you.
I have never seen one. I like the interchange anvil idea. Thanks
Advanced Innovations University - AIU
Awesome stuff, Sir!
Thanks for sharing
Hey neighbor, I like that. You may be onto something.
Thank you for explaining how to use the constant with the thread gauge wires. I bought my wires a few months ago, but could not figure out how that chart that came with them was supposed to be used. now it is all clear! luckily my first real threading jobs were one offs on tools I made for my self; no worry about hitting a standard for that session; next time I can.
Look at my other wire videos. You actually only need one wire.
Great Joe, do not think that there is anymore to say about threading, very deep...:):)
I think I just about covered the things you need to know. I go any deeper and I'll have to bring a flashlight.
Just found this video, great discussion clearing up details of measuring threads, thanks.
Hey Joe I had to cut some 1/2x13 , 5/16x18, 3/8,x24 threads today on the lathe for a job at home on for some special bolts and shafts use your techniques on threading ,and use the machinery handbook to get the head diameter and use the wires to Measure the pitch diameter. It was a class 2A thread. After I got finish with each bolt and shaft everything went together smooth and with no wiggle on the threads. I have to cuts some class 2B but I have to make a class 2B external thread on a plug gage so I can measure the internal threads. Thanks again for sharing information
Sounds like you're on the right track. Thanks for the comment.
Hey Joe you raised more questions on gauge diameter and pitch diameter, please run some numbers on making a gauge for your 1" 8 pitch thread so we can understand the what you mean.
Thanks, Joe
When you make a plug gage for an internal thread, use the pitch diameter (B) class)of the internal thread for the plug gage. Do not use the pitch diameter you would make a shaft with of the same thread. Does that help?
Invaluable. Many thanks.
thanks joe i no its an old show but it sure helped me out
3rd time I've watched this (slow learner.) This time after arguing with another (amateur) machinist about the single wire method you show. Being a long way from a real machinist doesn't mean I can't try to get good results. When I got my (Chinese) wire set, I measured each one to see how accurate they were, better than I had expected. Since the wires are going into a V any deviation in diameter is going to have a bigger affect on the final measurement. Fumbling with 3 wires, even with the yuck grease method was a challenge for me. Thanks for the help.
Using a single wire method, you can also inspect a part to see if the thread trajectory is true to the part OD. Simply place the wire in the thread and take a measurement, now rotate the part 90 degrees and do it again. If the 2 measurements are the same, the thread is true. You can't see that with 3 wires.
Joe.
interesting talk on threading like the back story on the board Always found if I knew the why the rest was easy.
Merry Christmas and all the best for 17 from Down Under
Will
Very good lesson !
Thank you !
Thanks for watching.
Thanks for the video....very interesting!
Thanks Chuck.
Once again, an outstanding training video. !!!
Glad you enjoyed it
Hi Joe, thanks again for efforts, I just ordered a toolholder to try your upside down threading method!
Make sure the chuck is OK in reverse and good luck. You will like it. Use a carriage stop too.
Hi Joe
My machine is a Student 1800 a smaller version but same as yours.
thanks for your warnings but I know all the tricks (I know this guy Joe!)
Joe, this is gold, thank you.
Thanks Joe, much useful information here.
Certainly food for thought. Thanks for watching
Hi, joe. I have to measure large acme threads to check if it is worn and documents my findings. In years past we used a go- no go test set. It has to do with % of life left on the threads it's not a deal breaker but it would help me get a good repeatable valve if I used the 1 wire and hardened dowel pin? Great video. Thanks for sharing
Great explanation Joe! The thought of using the B dimensions when turning a plug gauge was kind of an aha! moment for me. One question though, wouldn't that produce an interference fit if the internal thread was at tolerance? Would you cut the internal thread until the plug gauge just threads in? Or build a little allowance into the gauge? Does my question make any sense? Thanks.
My question also. Thanks
This is a great question, and one that can be argued forever. Do not cheat on the diameter of your gage. Make them spot on for both the high and low ends of the tolerance. Then look at them differently. The tolerance then becomes an acceptable range. The thread has to be bigger than the smallest, and smaller than the biggest. Think of them as GO/NO GO gages. One has to go, the other has to stay off. But technically, technically, technically, line contact, low side, threaded part is still within spec. You just will never get the gage out once you force it in. Good question.
That makes sense. Thanks!
Joe Pie, you are THE MAN!
Hi Joe,
I am really learning a lot from your videos. Thank you so much. I have a question that may or may not be worthy of video but maybe you can at least point me in the right direction. I am trying to use the Machinist's Handbook to figure out a thread problem. I want to thread a hole in a plate, approximately 3/4" in diameter that I will run a screw into to support a specific load, say 1000 pounds. How do I determine the minimum material type and thickness of the plate and TPI to support that load.
Thanks again,
Russell
Joe, this was a fantastic video.. I am a total armature so I learned a lot. I have a set of wire but haven't used them yet. I will the next time. One thing I thought of is when you use a single wire for your "Y" value, your error tolerance of the measuring equipment will double. That might be a interesting topic for a future video. Covering %of reading vs % of full scale.
Also I noticed the dive flag on your tee shirt. You make diving equipment? I use to do a lot of recreational diving in my younger days. Don't think my ears will let me do it any more. Take care and ignore all the trolls that know everything there is to know.
Al, Michigan
Hi Al. That twin light rig on my shirt is one of my companies products. There are a couple videos of it on my channel towards the bottom. It accepts most underwater cameras including GoPro and has two 3-LED grip type 550 lumen dive lights. Great unit for caves, ship wrecks, night dives etc. Super bright and light weight. Best price out there! Just sayin.
Hi" your passion for this is outstanding" great teacher to boot, but still friends have not got it. So" can you go over it again using the mic, & the machinist hand book, showing each "STEP" with the charts from your wires too. On the white board this is perfect. This is a BIG subject that most do with a wing & a prayer. I know others on utub have covered it,, BUT you have a style that's second to none, & passion, please break it down step x step take your time 10 videos if need be, but it will be the most viewed threading on the tube. I promise. Regards Rob U.K.
We just had a discussion on this topic last month. I showed the machinist at work the instructions on how to measure the external threads using the three wires per the machinery handbook and discovered that they were out of tolerance. CNC guys trust their CAM packages a little to much... Simple old school ways taught them a lesson that day.
Nice. Maybe a ring gage or two wouldn't be a bad idea either.
Thanks for all the great videos!
Merry Christmas Joe 3.142, and your family.
Thank you. Same to you and your's.
Damn good, Joe !!!
So glad I watched this video again today. I am about to make a plug guage to fit a 32mm x 2.5mm pitch internal thread to a depth of 100mm I have to cut, your warning about making the plug thread to class B thread pitch diameter will mean I get it the correct size. ( hopefully first time )
It would have been a common mistake.
How did I know you were going with the one wire method.:>)
It seems so obvious.
Thanks again Joe.
Worth
It really does. And that allows you to drop the wire twice before you have to look for them!
joe, i would like to see a video that gets into odd threads, multi-start threads, modules, diametrical pitches, maybe even worldwide threads that we see in the states occasionally (bsw,bsf,bsp,bspt) it seems as if no one has any videos with these odd pitches. few people can explain a diametrical pitch, much less cut it on a lathe. (including myself)
Awesome as always!
Lots of good stuff here. Thanks for watching.
Joe, An old trick I learned using wires is to stick the ends in a rubber eraser. Greatly reduces the number of hands (dexterity) needed to use 3 wires. You just hold the eraser and your mic.
Oh...also easy to find if you drop it in your chip pan. ;)
Did you know you actually only need one wire and its checks thread concentricity as well?
I did see that technique in your tutorial. Just saying 3 wire is about as easy using the eraser. Merry Christmas @@joepie221
Your videos are the best. Thank You
I've just watched this video,great detail joe,and it has convinced me to invest in some wires. Just a quick question,are these only suitable for 60 degree threads or can they be used on 55 degree bsw threads?
Rgds
Matt
outstanding explanation, outstanding knowledge. couldnt hit subscribe fast enough
Thanks for signing on. If you ever have a question, post it and I'll try to help you. I can also be reached through the website contact page. http//www.advancedinnovationsllc.com
Good info Joe! Thanks!
Thanks John
Good info Joe, thanks.
Regards,
Duck
Thank you
Thanks,joe a very good explanation
Thank you.
Hi Joe! I like your video content, and I have been watching your videos for quite some time. I have a question about internal threading. When I make a plug gage for an internal thread, do I machine the OD to the major diameter of the A class or to the minor diameter of the B class? Thank you for your instructional video I have learned a lot from them.
You use the major diameter of the A class, but the pitch diameter's of the B class. Many guys mess this up when making a gage. Since you make an external thread as a gage, many use the external PD specs to do so. common mistake.
Great vid, keep up the great content.
what do you know about the triangle shaped thread check tool with a plastic cable holding them in a U shape. the box came with a thread chart for the triangle for metric and imperial. Wasn't sure what they where but $1 at a swap meet was worth a purchase.
this video is great Joe. thanks! now i picked uip on two particular side issues that puzzle me about thread cutting .the first is that i did often wonder why major thread diameters were undersized .(i'm in the uk so mostly we work in the metric system)so naturaly you would expect that an M12 thread for example has a 12mm external diameter ,however ive often found this not to be the case on threads that ive purchased . and the second puzzle is that threads do not always have a relived area (undercut) ,is it somehow possible to acurately single piont turn such threads with no groove to begin or end in and if so how ?
Normally, the OD of a male thread is a little undersize. Realistically, it could be considerable undersize and still hold just fine. Its the pitch diameter engagement that offers the greatest cross sectional mating area. As for the runout thread, if you turn very slowly and have a dial indicator on your carriage, you could theoretically do it by eye. Some machines have an auto retract, but I've never run one.
I may be wrong, but using the one wire method might give inaccurate results in certain cases. It seems to me that it is only accurate if the threads are cut exactly centered on the od of the shaft. You must make a truing cut first (which should be done regardless) on the shaft before threading and measure. If you had say .010” runout on the shaft when put in chuck and started cutting threads, you would need to use the three wire method to accurately measure the PD.
I would hesitant to use the one wire method to check threads on a part that came into my shop because I would not be able to verify that it was threaded straight to begin with.
Other than that, I do love the one wire trick. It has helped me take my threading to the next level.
The majority of the time you run a single point thread, you also establish the OD in a prior op. I try to be as thorough as possible, but an assumption of concentricity is assumed. You are correct though. But...If you took the single wire and checked your thread in several rotational places, a difference in measurement would indicate eccentricity. A side benefit for evaluating a thread that doesn't go on. 3 wire won't tell you that. Just food for thought.
@@joepie221 My god you make that sound awesome! I want to make some damn threads and I've never even seen a lathe in real life! By the way, square threads are sexy, just sayin'.
So here is a question for you Joe, I do gear cutting and measuring with a pin is how the shop always has me do final checks but I have a nice set of starrett gear tooth Verniers that I would love to use but I am not 100% sure how you use them or do the math. You wouldnt have any idea or somewhere to look? Just came to mind after watching your video.
I really wish I could offer some advice here, but I have never cut a gear from a blank. You have one on me there.
highly recommended for those new thread enthusiasts.
2 thumbs down. Nice to see DB and one of his guys stopped by. Like clockwork. Thanks for checking in.
Hi Joe - I've been reviewing your thread videos - haven't watched them all yet. But have a question - when turning a male thread on a shaft, what diameter do you turn the OD to before cutting the thread? I don't think you turn it to the major diameter - seems that would be slightly too large. How do you know what size to start the shaft diameter at before approaching it with the threading tool?
Naturally, the max outer diameter is the stated nominal size of the thread. Depending on how big that is, you should stay a little under. For example. .010 undersize on a 3/4-10 is fine, but .010 undersize on a 10-32 may be a bit much. Use your best judgement if you don't have a machinery handbook to reference.
Thank you Joe! That is helpful.
Great info on threading Joe can you show some id threading going away from chuck like you did on od?
Will do Mike. Thats coming real soon.
Thank you, your videos are excellent
im a huge fan of thread wires ... great to know the one wire method now. im the qc manager at our shop and use them alot.
Thanks
Rick
They are very accurate once you get "The Feel" for them. And since you have 2 spares of each size now, you have ready made Christmas presents for the other inspectors !! Thanks for commenting Rick.
Hey Joe I made a threaded gauge for a 4 1/4 12 3B threaded bore. I used the 3B internal pitch as necessary and was told to use the 3b major diameter for the major diameter of my plug and im not totally sure that is correct. so what should your major diameter be for a plug gauge thanks Joe.