RE: [CAD_CAM_EDM_DRO] ball screw preferences

Curious you picking two ball screws.

I've just stripped the ball screw on my big mill. Those I have stripped in
the past were always one track with a bit of pipe to return the balls from
one end to the other.

Now I have it apart, my machine uses two ball nuts, each runs the balls in
one turn with a junction to drop the balls one turn. They do this five times
in each ball nut. But the ball nuts come together with a taper face and a
sprung steel ring with tapered faces between on a clamp, tightened to zero
the back lash.







Dr. Mark Vaughan Ph'D. B.Eng. M0VAU

Managing Director

Vaughan Industries Ltd, reg in UK no 2561068

Water Care Technology Ltd, reg in UK no 4129351

Addr Unit3, Sydney House, Blackwater, Truro, Cornwall, TR4 8HH, UK.
Phone/Fax 44 1872 561288

_____

From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Aubrey Laughlin
Sent: 09 March 2007 04:21
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] ball screw preferences



Billy:

I got my ballscrews and nuts from McMaster Carr. I got two-per-axis and put
a spring between each two. A hose clamp and a piece of aluminum angle holds
it all together. Here's a picture:
http://www.cooknwit
<http://www.cooknwithgas.com/CNC_Mill/2_16_07_Mill_Xaxis.JPG>
hgas.com/CNC_Mill/2_16_07_Mill_Xaxis.JPG

The springs are valvesprings from an old lawnmower engine - nothing fancy.
The ballscrews and ballnuts are the cheapest in the McMaster Carr catalog
(website) and are 5/8" units.

Scott Laughlin
Omaha, Nebraska
http://www.cooknwit <http://www.cooknwithgas.com/CNC_Mill/CNC.html>
hgas.com/CNC_Mill/CNC.html

----- Original Message ----
From: Billy Stringfellow <bstringf@comcast. <mailto:bstringf%40comcast.net>
net>
To: CAD_CAM_EDM_ <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
DRO@yahoogroups.com
Sent: Thursday, March 8, 2007 7:07:10 PM
Subject: [CAD_CAM_EDM_DRO] ball screw preferences

Hello

I have started building a small cnc mill .Iam at the point that

i must select stepper motors and ball screws,

The table is a Enco milling table

I need 3 ball screws and nuts about 2o " long.

I am seeking advice about the screws and motors, remembering this

my first CNC build. It will be 4 axis ,one for a dividing head.

Does anyone have experience with rolled screws.

Help:o)

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