The Shop > Tools
Lead screw size?
websterz:
I need to make a new set of half-nuts for my HF 7x12. Cheap folks that they are the Chinese had only installed the lower half of my half-nut but I got on with it because I wasn't too worried at the time. Well, the half that I got is wearing out...cheap Chinese iron you know, and my power feed is beginning to slip. I recently had 200+ pounds of century-old cast iron delivered by a friend of mine in the form of a junked out upright piano harp. The material is fantastic...cuts like butter! Anyway, I am going to take advantage of the bounty and make a proper SET of half-nuts for my lathe but I have no idea what the leadscrew size and pitch is. Anyone know off the top of their head? All I know is that it is an Imperial, not a metric screw.
:proj:
Darren:
16tpi I believe http://www.littlemachineshop.com/Reference/change_gears.php
Metric is 1.5mm pitch
websterz:
--- Quote from: Darren on September 11, 2009, 06:35:50 PM ---16tpi I believe http://www.littlemachineshop.com/Reference/change_gears.php
Metric is 1.5mm pitch
--- End quote ---
hmmm...I may be removing that and putting a 5/8-16 ACME on in it's place.
Bernd:
websterz,
My 8 X 20 Grizzly has a 16tpi. I wondered why I couldn't cut a good Imperial thread.
The lathe is going to go through a total rebuild. I've already started on the frame al Bogstandards fix of (i think it was ) Darren's lathe. Not going to put threading capabilities on it though. I have the Logan lathe for that.
I was also thinking of going for an ACME thread but maybe 1/2-20. Might even try to cut my own using the Logan.
Unfortunatly right now I'm to busy with "need to do stuff" that doesn't include playing in the shop. :(
Bernd
No1_sonuk:
--- Quote from: websterz on September 11, 2009, 06:47:42 PM ---hmmm...I may be removing that and putting a 5/8-16 ACME on in it's place.
--- End quote ---
If you're going to replace it, I would suggest making the right-hand end longer through the bearing if you can.
Doing that means you could more easily add a separate fine feed and/or CNC motor, handwheel, etc. :thumbup:
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