MACHINE SHOP TIPS #25 Acme Threading Part 2 tubalcain

[mrpete222]

Search-- MACHINE SHOP TIPS #24 Acme Threading Part 1 tubalcain

[patrickmacdonald1]

Do you have part 1 ?

[JDSly1]

I work in a job shop and do this type of work all the time. Got some valuable pointers from this video-- Thanks. One time when I was still "green" I had to make a threaded shaft for a nut supplied by the customer. I didn't realize it was a "double helix" acme (2 starts), which obviously caused a lot of problems. Always something I check for now.

You remind me of my H.S. Machine shop teacher, Tubalcain (a compliment). My old Machine shop class is gone, and is now the spanish class. Sad.

[bigcris123]

Can one use the three wire method to check the acme thread? I have to cut one and I don't have a nut to check it. Do you recommend the one or three wire method?

[JDSly1]

@bigcris123 : I have a three wire set (Starrett, I believe), and it comes with instructions for both standard AND Acme threads.

[Metalunique]

Great tutorials. I'd give anything to be at the front of your class!!!

[themetalcutter]

Hi thanks for the videos I found them very interesting, I do however have a question for you. I have two lathes one is a Myford super 7 and the other is a Harrison M300, the Myford has a direct reading top and cross slide and the Harrison has got a direct reading cross slide but the top slide reads the movement of the slide. In your view which one is right, I think that the top slide should't be direct reading because when it is at an angle it cant posibly be reading off the diameter. Thanks Tim

[mrpete222]

@themetalcutter I wouldn't call one of them right or wrong. But I agree that the top slide (compound slide) Is sometimes set parallel to the bed and then you certainly would want it to read the actual movement. I have seen lathes built both ways. It can be confusing in a large shop where you are using many different makes of lathes.

[themetalcutter]

@mrpete222 If the top slide is direct reading then surely when you are incrementing it when screw cutting at what ever angle it is set to, it isn't giving you the movement of the top slide because the top slide only moves half of what it actualy reads, to me this is wrong. So I presume you would therefore have to half the value to get an accurate depth of cut. I am just trying to get my head around this because the small Myford has a direct reading top slide.

By the way excellent videos.

[mrpete222]

@themetalcutter Correct--you would have to use trigonometry to figure the amount. or make a dry run using a dial indicator to move it the actual amount. Then make a notation of how far the dial was rotated to acheive that amount.. Is that as clear as mud??

[anajonesr]

Excellent videos. I am enjoying the these videos thoroughly. If multiple starts were desired, how would each thread be setup on the lathe?

[CCasket]

Thanks again for the great tutorials Mr Pete. I have a question though, how would one go about cutting an internal ACME thread? Same as an internal "V" thread with the exception of the different compound angle appropriate to ACME form?

[mrpete222]

@CCasket Yes--just set compound 29 to left & use an acme tool.

[mce1919]

Thank you

[ahz123]

When you say, "an even number of threads" with respect to the thread dial, don't you really mean, "an integer number of threads"? That is, wouldn't a 13 TPI thread use exactly the same thread dial rules? Now, there are some whacked-out threads on my lathe such as 5.5 or 5.75 TPI. I believe these require more restricted use of the dial.

Anyway, I very much appreciate your videos.

[goward3]

Thanks for the ACME series! I appreciate all the detail. If you're actually going to do this stuff you need the detail to make the cutters. You are an awesome teacher! I wish I could have been in your class. Thanks again!!

[mithigarcha1]

thanks a lot , i was waiting for part two ,,wish granted -thank you tubalcain ..keep up the good work

[coriander2]

"Doesn't this guy ever cut any metal...." ha! LOL.

I've never cut an acme thread, didn't realise it was so complicated.Thanks for posting

[mrpete222]

Thanks. Very interesting. I guess there's more than one way to do it.

[alpho52]

Old Southbend instructional movies cutting an acme_thread.mp4

Hi tubalcain...In this old southbend video here on YouTube [link above] they cut an acme thread without setting the compound on 141/2 deg? The tool bit is square to the work, and all cuts are fed in by the crossfeed only...What's up with that? PS I enjoy all your videos, YOU ARE THE MAN!

[sandwon]

Thanks. I have to cut some A C M E Threads.

Maybe tommorrow

Now I have a Better insight of the Process Thanks too you.

God Bless You.

[sawbj]

thanks.fore good videos pete .love them bjorn sweden

[mrpete222]

THANK YOU!!

[harleyghost]

I can not tell you how much I enjoyed watching these videos. I recently cut my first acme thread (1/2" 10 TPI) for a project. I just wished I could of watched these 1st. You are a good teacher. Thank you

[mrpete222]

Yes--just the appropriate tool.

[apowellz]

Thanks - very satisfying to see the results. Now out to the shop to try it for myself.

[schneidp20]

I look forward to each and every one of your videos. I may never have a need for an acme thread, but I can still learn a lot from the setup. Thanks again!

[steveBB30]

Would ACME internal threads be cut much the same as other internal threads, but with a tool with appropriate angles?