Re: [CAD_CAM_EDM_DRO] Machinig Ball Screws

I use cemented carbide with the ballscrew mounted in a 5c
collet. The lands on some screws are not accurate datum
points so other methods that have been mentioned (wire,
4 jaw) must be used.

The ball races can be indicated by setting up the dial indicator
on the lathe carriage with threading engaged at the ballscrew pitch.

I use a Themac J40/45 tool post grinder for the last thousandth. Just as
good results can be obtained by honing
with 120 grit abrasive paper. Tenths matter.

I mill keyways on an Index vertical mill. I usually mill two
keyways 180 degrees apart to prevent warping from internal
stress.

The biggest timesaver I can offer when machining hardened
screws is to first rough grind off the hardened outer surface
with a hand angle grinder- being careful not to go too far. Then the only
hardened area to machine is just a shoulder.

Leslie Watts
L M Watts Furniture
Tiger, Georgia USA
http://www.rabun.net/~leswatts/wattsfurniturewp.html

----- Original Message -----
From: <currinh@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, November 03, 2001 1:28 PM
Subject: [CAD_CAM_EDM_DRO] Machinig Ball Screws


> CNC Crew:
>
> I can not find the original message. Wasn't someone asking about
> machining ends on ball screws recently? Trying to temper (heat & slow
> cool) the ends in a lathe to make them easier to machine.
>
> Anyway, I'm facing the same problem and am also looking for advice.