RE: [CAD_CAM_EDM_DRO] ball screw preferences

You can buy �pre-loaded� ball nuts from various manufacturers. They are
preset to allow for the maximum variation in lead error and rigidity.

One ball nut is mounted to a bracket that is mounted to the moving portion
while the other nut is loaded to produce the rigidity required for the
application (the expected reaction force of against the slide or moving
portion). There are standard formulas used to determine the preload.

R. Wink





_____

From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Mark Vaughan
Sent: Friday, March 09, 2007 6:00 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: 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: HYPERLINK
"mailto:CAD_CAM_EDM_DRO%40yahoogroups.com"CAD_CAM_EDM_-DRO@yahoogroups.-com
[mailto:HYPERLINK
"mailto:CAD_CAM_EDM_DRO%40yahoogroups.com"CAD_CAM_EDM_-DRO@yahoogroups.-com]
On Behalf Of Aubrey Laughlin
Sent: 09 March 2007 04:21
To: HYPERLINK
"mailto:CAD_CAM_EDM_DRO%40yahoogroups.com"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:
HYPERLINK "http://www.cooknwit"http://www.cooknwit
<HYPERLINK
"http://www.cooknwithgas.com/CNC_Mill/2_16_07_Mill_Xaxis.JPG"http://www.cook
nwit-hgas.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
HYPERLINK "http://www.cooknwit"http://www.cooknwit <HYPERLINK
"http://www.cooknwithgas.com/CNC_Mill/CNC.html"http://www.cooknwit-hgas.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>
HYPERLINK "mailto: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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yahoo.com/dir/-?link=list&-sid=396545367

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