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mini lathe mods and accessories

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Darren:
This is in ref to a mini lathe that has a square drive thread....so as you say should give no problems if it is a slower disengage.

But I can see your point if a normal thread is used for a leadscrew, do any lathes use this type of thread on the leadscrew?

John Hill:
Guys, my discomfort regarding the slowly disengaging lead screw is as the nut halves begins to move away there is less bearing surface to carry the load and this slowly decreases until the half nuts eventually  'pop' out of engagement.  I feel this will damage the half nuts by rounding the surface and eventually (maybe when the lathe is 100 years old, maybe sooner) the threads of the half nuts will be so rounded they wont stay in engagement.

Just my tuppence.

Darren:
That's a valid point John H...well pointed out... :thumbup:

bogstandard:
Darren,

You will find that most leadscrew threads are in fact trapezoidal (acme shaped) rather than square, so what I was saying about the angles relates to those as well. As they are just like normal angled threads, but with the pointy bit cut off the top.

Also what John states about wear is a very valid point.


John

Darren:
I didn't realise acme was trapezoidal, thanks for pointing that out

I'll shut up now..... :)

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