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2nd Sep 2019, 05:19 PM #1Intermediate Member
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- May 2016
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- AU
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- 30
Cutting a 2mm pitch 3/8 acme thread
So I'm up to cutting the thread on the replacement compound feed screw.
Putting the gearbox in 2mm pitch mode works for a normal triangular thread, but looks way too small for the acme thread.
Should I be using a different pitch or feed rate for acme thread? The gearbox mentions 50 or 20 stud gear. Which one is that?
I haven't done a lot of threading to date. I'm also going to put a forward and reverse switch on the lathe as I don't have a threading dial.
Any pro tips?
Martin
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2nd Sep 2019, 07:27 PM #2Most Valued Member
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- Jun 2007
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- sydney ( st marys )
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Take the 20 off the stud and take the 50 off the screw, put the 50 on the stud and the 20 on the screw, engage the 50 with the 80 and the 45, use the 20 as the spacer on the screw.
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2nd Sep 2019, 07:32 PM #3Intermediate Member
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- May 2016
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- AU
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Awesome, easy to understand instructions that directly answer my question.
Thanks Pipeclay.
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3rd Sep 2019, 09:59 PM #4Member
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- Nov 2015
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- Brisbane Australia
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- 85
This You Tube clip might be helpful
https://www.youtube.com/watch?v=df-7...ature=youtu.be
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6th Sep 2019, 06:24 PM #5Intermediate Member
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- May 2016
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- AU
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- 30
So thanks to the help of pipeclay I set up the change gears, ground a hss tool, and had a go at cutting the acme thread.
I was happy with this for my first go. I'll cut another one for practice before I have at my blank.
Before I do, though, I really need to get a fwd/reverse switch. Rolling the chuck backwards after each pass got old pretty quickly. Anyone in Melbourne got a source for this kind of switch gear? I'm running a 1hp single phase motor through a DOL switch. Any issues I should consider?
Martin
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10th Sep 2019, 10:31 PM #6Most Valued Member
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- Oct 2010
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- melbourne, laverton
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- 1,910
star wheel
if your in melbourne you can borrow my star wheel if you like.
aaron
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11th Sep 2019, 03:52 AM #7
Hi Guys,
If a star wheel is what I think it is, I made one using an old washing machine drum pulley.
21022015-01.JPG 21022015-05.JPG
You tighten the nut to expand the collet inside the lathe spindle.
Another turning job.Best Regards:
Baron J.
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11th Sep 2019, 10:13 AM #8Most Valued Member
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- Jun 2007
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- sydney ( st marys )
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I maybe wrong but I think the Star wheel mentioned is referring to the Thread Chasing Dial.
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11th Sep 2019, 10:31 AM #9Senior Member
- Join Date
- Oct 2010
- Location
- NSW
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- 177
No wheel at all on my version. I made the expanding collet and use my cordless drill to reverse back to the start of the thread.
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11th Sep 2019, 10:34 AM #10Intermediate Member
- Join Date
- May 2016
- Location
- AU
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- 30
I thought it was a reference to the giant ferris wheel down at Docklands.
I'll probably make something like that expanding arbor. I think I actually have something like that from an old washing machine myself! I like to use these bits and pieces so that I can prove that keeping it was worthwhile, despite what others in my household might say...
Unless I find a fwd/reverse switch first. Or buy a thread dial from Mal.
Martin
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11th Sep 2019, 06:42 PM #11
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15th Sep 2019, 11:28 PM #12Most Valued Member
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- Oct 2010
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- melbourne, laverton
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threading dial
as usual pipe clay was on the money.
i was talking about a threading dial.
aaron
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29th Sep 2019, 01:44 PM #13Senior Member
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- Aug 2012
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- Greenmount, W.A.
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- 70
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- 272
It is Sunday, so brain not engaged yet, but.........
Hercus Compound screw is a Left Handed thread. The photo showing the two threads are different hands or are they?
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29th Sep 2019, 01:51 PM #14Most Valued Member
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- Jun 2007
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Yes the Cross Slide screw and Compound screw are different, they are Left and Right handed.
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1st Oct 2019, 08:07 PM #15
Acme or Trapezoidal
I am curious Acme threads are imperial only.
The metric version is trapezoid.
Not much different to look at but the metric screw has 15 degree flanks and a included angle of 30° not 29° like a Acme thread.
Are they really Acme threads with a 2mm pitch?
MarkI've become a tool of my tools.
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