Re: [CAD_CAM_EDM_DRO] Rolled vs. Ground ballscrews or other screws!

Not true. Acme ballscrews are 45% efficient whereas ballscrews are about 90%
efficient. Thus it would take half as much torque to turn a ballscrew than a
acme leadscrew. The only problem withj ballscrews is if you don't have some
king of a pulley drive ratio they may actually backspin in a manual cut on
the axis not being manually turned. I've never seen a acme leadscrew back
spin.
Dan Mauch
low cost stepper and servo motors.
cases for Gecko drives
kits and assembled 3-4 axis drives

www.dmauch@...
www.camtronics-cnc.com

----- Original Message -----
From: "George Taylor, IV" <gtaylor@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, September 19, 2005 10:55 AM
Subject: Re: [CAD_CAM_EDM_DRO] Rolled vs. Ground ballscrews or other screws!


> Andy,
>
> I'm not an expert, and I havent put ballscrews on my Bport (yet) but a
> tool
> & die maker friend "warned" me that when I do, the screws will be tighter
> in
> manual mode than the acme's. Specifically, I think he meant when you
> first
> start to turn the dials. Perhaps after they get rolling its easier?
>
> George
>
> ----- Original Message -----
> From: "Andy Wander" <awander@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Monday, September 19, 2005 9:26 AM
> Subject: RE: [CAD_CAM_EDM_DRO] Rolled vs. Ground ballscrews or other
> screws!
>
>
>> Juan:
>>
>> The nut won't wear the screw as fast as the screw will wear the nut. But
> the screw will wear.
>>
>> And the friction n a well-fitting acme or other leadscrew will be greater
> than in a ballscrew.
>>
>> Andy Wander
>> Verrex Corporation
>>
>> -----Original Message-----
>> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of juan gelt
>> Sent: Sunday, September 18, 2005 9:18 PM
>> To: CAD_CAM_EDM_DRO@yahoogroups.com
>> Subject: Re: [CAD_CAM_EDM_DRO] Rolled vs. Ground ballscrews or other
> screws!
>>
>>
>> that's a new thought to me. i can see how rolling
>> could produce less wear over the long haul.
>> but i can't see how a brass nut is gonna wear down a
>> steel screw very fast. and a leadnut and backlash nut
>> are consumable parts, no?
>>
>>
>>
>>
>>
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>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
> aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it
> if you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
> sister site to the CCED group, as many of the same members are there, for
> OT subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
> DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
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> Yahoo! Groups Links
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