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

Dan,

Thanks for the clarification. I have been meaning to go ballscrews in
preparation for CNC. I usually lock the axis I'm not moving, so you have
convinced me that it's OK to do that while still manual.

George

----- Original Message -----
From: "Dan Mauch" <dmauch@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, September 19, 2005 2:11 PM
Subject: 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?
> >>
> >>
> >>
> >>
> >>
> >> Addresses:
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> > URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> >
> > 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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> Addresses:
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timg@...
> Moderator: pentam@... indigo_red@... davemucha@...
[Moderators]
> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
> 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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