Re: Rolled vs. Ground ballscrews or other screws!

George,

If you convert to ballscrews to be used manually in
preperation for CNC conversion, you may want to be
careful when climb milling. I think it can be a bit
dangerous with ballscrews because of their very low friction.


Scott


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "George Taylor, IV"
<gtaylor@m...> wrote:

> 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@s...>
> 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@s...
> > www.camtronics-cnc.com
> >
> > ----- Original Message -----
> > From: "George Taylor, IV" <gtaylor@m...>
> > 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@v...>
> > > 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
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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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> [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
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
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> >