Gallery, Projects and General > The Design Shop

Should I or shouldn't I ?

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awemawson:

--- Quote from: Meldonmech on December 21, 2013, 04:23:56 AM ---
    Modifying the lathe may devalue it, if at any time you want to sell it.

                                                                                                                Good luck whatever you decide   Cheers  David

--- End quote ---

If he keeps the old bits he's not got a problem from that p.o.v.

Andrew

tekfab:
Thanks for the various inputs,  I've decided to stick with the 8tpi .
I could now do with a arithmetic check please. From what I have read and referenced for Acme standard thread 8tpi depth of thread is 0.0725" am I correct ? I will be using a purchased form tool for the exterior thread but grinding up a tool for the internal and as I've never ground an acme tool before any helpful tips will be much appreciated.

Mike

rotorhead:
Hi Folks,

Happy New Year to All.

Funny this thread has come up, as I've had a similar conundrum regarding modifying the cross slide leadscrew on my Son's Bantam 800.

To start with the details, thread is 9/16"dia x 5 x 2 start lh acme, i.e. 200 thou divs on dial.

E-bayed for bits, they price ranged from ridiculous to insane, scrubbed that.

The nut was worn as was the leadscrew (reason for replacing http://madmodder.net/Smileys/default/doh-45.gif).

To cut a very long story short, we bought a 5/8" x 10 lh acme tap, some internal and external acme 10 tips, and left and right toolholders, also a 1/2" x 10 rh acme tap for a topslide nut replacement.

I also had to grind a 3/16" woodruff cutter for the splined section, just doing that incurred making a grinding jigs for the Clarkson.

I used EN16T 5/8" bar for the cross slide screw.

I should have added that in going this route I've halved the dial readout, so what is dialled is what's taken off, far better for my Son anyway, although I'm not having a pop at anyone, this is a tool to be used, not an artefact.

Pics below tell the tale....

BaronJ:
Very interesting.  I had need for a leadscrew to drive a quadrant a while back.  I re-purposed the worm and nut from a broken B&D work table.

bertie_bassett:
rather then cutting your own internal threads, would it be any easier to mold a acetal/delrin 'nut' around the actual shaft?, should give pretty good accuracy from what iv seen/heard

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