Acme Threads

[dallen]

HELP I got one of these

   

so whats the best way to cut ACME THREADS???????

[EdK]

(09-26-2012, 01:11 PM)dallen Wrote: so whats the best way to cut ACME THREADS???????

Very carefully.

I know, probably not the answer you were looking for but I couldn't resist.

Ed

[dallen]

your saying I can't hog the bit in really deep and go hog wild and to a 3 TPI in one or two passes

I had pretty much figured this would be a really slow process specially since here in about ten minutes is going to be the first time I have tried ACME threads. but gotta learn some time.

and I already found out that I get to make a new protractor for y HF grinder so I can get the bit closer to the wheel (didn't get protractor with grinder)

will post pictures tomorrow

[doubleboost]

http://www.metalworkingfun.com/showthread.php?tid=842
John

[stevec]

(09-26-2012, 02:59 PM)dallen Wrote: your saying I can't hog the bit in really deep and go hog wild and to a 3 TPI in one or two passes

Three theads per inch? I'm dying to know what's it for and what's the OD?

[dallen]

threads are for nothing, I just want to learn how to cut acme threads and the 3 was the spot on the gauge that the bit fit when I ground it.

What you might call a self inflected school project for extra credit, cause if I can cut em correctly I'll know more tomorrow then I did today.

And I already screwed it up three times. wrong pitch for the width of the bit, bit loose in holder and slipped, and one other but I can't remember now.

So I'm still learning cause I don't know how to do it right.

[doubleboost]

(09-26-2012, 04:39 PM)dallen Wrote: threads are for nothing, I just want to learn how to cut acme threads and the 3 was the spot on the gauge that the bit fit when I ground it.

What you might call a self inflected school project for extra credit, cause if I can cut em correctly I'll know more tomorrow then I did today.

And I already screwed it up three times. wrong pitch for the width of the bit, bit loose in holder and slipped, and one other but I can't remember now.

So I'm still learning cause I don't know how to do it right.

Once you have cut the thread we need to see a nut that will screw on to it (that is the hard part)
Have fun
John

[dallen]

heres a shot of the threads that I did today as you can see I messed em up see that little ridge on the right flank. thats from grinding the bit wrong to start with then taking it out and re grinding it and picking the thread back up and not going deep enough to clean it up.

Boost I learned to use big stuff to learn on its easier to see the high spots and grind em out so the nut will fit. Hadn't thought of that but whats a bolt without a nut, so have to make one of them to another nights homework. and here I was planing on casting a new protractor for my Harbor Frieght Grinder in the morning.

anyway heres the picture

What you see is part of a junk steering adjuster that a friend wanted me to copy, The part that I was cutting acme threads on was welded into a piece of two inch tube and is froze on the 1" thread from dirt getting into it. I was going to make a part for the press I have been working on and decided that since it was junk I would try the acme thread bit.
   

[EdK]

David,

What the hell, you learned something from the experience and that's what counts. Some day I'll tackle an acme thread.

Ed

[dallen]

Well Ed the dog made me do it, little slave driver just won't give me a moments rest get one thing done and he finds something else to keep me out of his hair Now Doubleboost says I gotta make the nut too you see what I get my self into