CAD CAM EDM DRO - Yahoo Group Archive

Re: X-Y Table, Rotary Table for CNC INFO

on 2003-01-17 06:30:04 UTC
Hi guys,

murphreys law will show up pretty soon.

if you are threading, the part/table will lift if not held in place.
ditto for drilling thru holes or uplifitng milling cutters. so now
you would also need antibacklash on your inclines. It would be much
easier to make the Z move.

Dave




--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Marcus & Eva" <implmex@a...>
wrote:
> Hi Les:
> Sounds a bit like a screw that has been unrolled from around its
> shaft!!! : )
> Best way for this approach might be a pair of wedges mounted on
linear ways
> tipped up at an angle.
> Kind of like a ballscrew unrolled from around its shaft.
> Do you think four linear ways and one ballscrew would be cheaper
than 4
> ballscrews, nuts pulleys and timing belt?
> What about rolling it uphill on wheels (bearings)?
> This thought experiment is starting to show some promise!!
> Cheers
>
> Marcus
>
> ----- Original Message -----
> From: "Les Watts" <leswatts@a...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Thursday, January 16, 2003 2:11 PM
> Subject: Re: [CAD_CAM_EDM_DRO] Re: X-Y Table, Rotary Table for CNC
INFO
>
>
> > Dave,
> >
> > You're right about stubby ballscrews being very expensive.
> >
> > Most of the real cost the nut, end machining, and end bearings.
> >
> > So a 5" ballscrew might cost almost as much as a 5 foot one!
> >
> > You mentioned punch dies.
> >
> > What if you used 3 or 4 sliding bearing columns like many
> > die sets but performed z axis with 3 or 4 corresponding
> > sliding wedges (actually linear cams)? The wedges would
> > translate a single horizontal motion into an accurate
> > "parallelogram" type vertical motion. Perhaps using cam
> > follower bearings with strong spring preload. I have seen
> > some machines made this way.
> >
> > Just trying to think of how to get the cost out of something
> > that you could just bolt on and go... or optionally bolt
> > on a simple fixed spindle structure later.
> >
> > Les
> >
> > Leslie Watts
> > L M Watts Furniture
> > Tiger, Georgia USA
> > http://www.alltel.net/~leswatts/wattsfurniturewp.html
> > engineering page:
> > http://www.alltel.net/~leswatts/shop.html
> > Surplus cnc for sale:
> > http://www.alltel.net/~leswatts/forsale.html
> > ----- Original Message -----
> > From: <david_mucha@y...>
> > To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> > Sent: Thursday, January 16, 2003 8:36 AM
> > Subject: [CAD_CAM_EDM_DRO] Re: X-Y Table, Rotary Table for CNC
INFO
> >
> >
> > > Hi Les,
> > >
> > > I think a simple adapter on the fine feed of most mills would
be very
> > > easy. just mating gears with a slip connector, like a reverse
ring
> > > gear. I think there are similar units for shaft alignment.
> > >
> > > remove for easy manual. all it would need is one mount for
torque
> > > and then just software home setting.
> > >
> > > Seems much easier than a rising table.
> > >
> > > My punch dies with ball screws are EXPENSIVE in short strokes.
I
> > > think the ridigity would make a power Z better tan a power
table.
> > >
> > > imho.
> > >
> > > Dave
> > >
> > >
> > >
> > > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Les Watts"
<leswatts@a...>
> > > wrote:
> > > > Hi Marcus
> > > > Hmmm I guess 4 short ballscrews with timing belt or something.
> > > > Kind of like my wood planer.
> > > >
> > > > It would have to be rigid, but it might be so small that it
would
> > > not
> > > > be too heavy.
> > > >
> > > > Just daydreaming really... people often ask if I can design a
> > > > small cnc with good accuracy for an arbitrarily low price...
> > > > but the price usually turns out high. Manufacturing even small
> > > > machine tools in the US is a pretty rough proposition....
consider
> > > > Bridgeport, South Bend, et al. But one can do it for a hobby
> > > > with no problems! As a business I only build machine tools
> > > > for internal use and that has worked out ok. Of course I do
> > > > design some production machine tool components, but
> > > > the development cost is pretty high for my customers.
> > > >
> > > > Les
> > > >
> > > > Leslie Watts
> > > > L M Watts Furniture
> > > > Tiger, Georgia USA
> > > > http://www.alltel.net/~leswatts/wattsfurniturewp.html
> > > > engineering page:
> > > > http://www.alltel.net/~leswatts/shop.html
> > > > Surplus cnc for sale:
> > > > http://www.alltel.net/~leswatts/forsale.html
> > > > ----- Original Message -----
> > > > From: "Marcus & Eva" <implmex@a...>
> > > > To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> > > > Sent: Wednesday, January 15, 2003 11:10 PM
> > > > Subject: Re: [CAD_CAM_EDM_DRO] X-Y Table, Rotary Table for
CNC INFO
> > > >
> > > >
> > > > > Hi Les:
> > > > > Were you thinking of a four poster bed type of setup
with a
> > > central
> > > > > screw?
> > > > > Or maybe four timed screws with encoders or steppers slaved
> > > together?
> > > > > I suppose you could chain drive them or belt drive them
from one
> > > stepper
> > > > > too.
> > > > > That could work pretty well I think, if you used good hunky
> > > frictionless
> > > > die
> > > > > bushings and pins.
> > > > > I'm thinking of the kind that have sleeves with balls in
them;
> > > the ones
> > > > > that are used for big punch dies.
> > > > > You could make the base wide enough that the pins hang over
the
> > > edges of
> > > > the
> > > > > mill table as they come through the base plate.
> > > > > That way you wouldn't lose too much height under the
spindle nose.
> > > > > Gonna be a pretty heavy accessory unless you make the base
out of
> > > > aluminum.
> > > > > Cheers
> > > > >
> > > > > Marcus
> > > > >
> > >
> > >
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> > > List Mom
> > > List Owner
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> > >
> >
> >
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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
> >
> >
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> >
> >

Discussion Thread

Larry Braden 2003-01-14 19:49:01 UTC X-Y Table, Rotary Table for CNC INFO Les Watts 2003-01-14 19:58:52 UTC Re: [CAD_CAM_EDM_DRO] X-Y Table, Rotary Table for CNC INFO doug98105 <dougrasmussen@c... 2003-01-14 21:00:26 UTC Re: X-Y Table, Rotary Table for CNC INFO ccq@x... 2003-01-15 01:56:46 UTC Re: [CAD_CAM_EDM_DRO] X-Y Table, Rotary Table for CNC INFO david_mucha <david_mucha@y... 2003-01-15 08:02:26 UTC Re: X-Y Table, Rotary Table for CNC INFO Drew Rogge 2003-01-15 08:17:24 UTC Re: [CAD_CAM_EDM_DRO] X-Y Table, Rotary Table for CNC INFO Les Watts 2003-01-15 09:47:45 UTC Re: [CAD_CAM_EDM_DRO] X-Y Table, Rotary Table for CNC INFO Marcus & Eva 2003-01-15 19:04:57 UTC Re: [CAD_CAM_EDM_DRO] X-Y Table, Rotary Table for CNC INFO Les Watts 2003-01-16 03:32:29 UTC Re: [CAD_CAM_EDM_DRO] X-Y Table, Rotary Table for CNC INFO david_mucha <david_mucha@y... 2003-01-16 05:36:16 UTC Re: X-Y Table, Rotary Table for CNC INFO Les Watts 2003-01-16 14:06:39 UTC Re: [CAD_CAM_EDM_DRO] Re: X-Y Table, Rotary Table for CNC INFO Marcus & Eva 2003-01-16 19:30:57 UTC Re: [CAD_CAM_EDM_DRO] Re: X-Y Table, Rotary Table for CNC INFO ballendo <ballendo@y... 2003-01-17 02:17:03 UTC Re: X-Y Table, Rotary Table for CNC INFO Les Watts 2003-01-17 05:39:55 UTC Re: [CAD_CAM_EDM_DRO] Re: X-Y Table, Rotary Table for CNC INFO Les Watts 2003-01-17 05:54:53 UTC Re: [CAD_CAM_EDM_DRO] Re: X-Y Table, Rotary Table for CNC INFO Ray Henry 2003-01-17 05:57:45 UTC Re: Re: X-Y Table, Rotary Table for CNC INFO david_mucha <david_mucha@y... 2003-01-17 06:30:04 UTC Re: X-Y Table, Rotary Table for CNC INFO Les Watts 2003-01-17 07:11:54 UTC Re: [CAD_CAM_EDM_DRO] Re: X-Y Table, Rotary Table for CNC INFO alex 2003-01-17 07:31:02 UTC Re: [CAD_CAM_EDM_DRO] Re: X-Y Table, Rotary Table for CNC INFO Larry Braden 2003-01-17 11:10:14 UTC Re: X-Y Table, Rotary Table for CNC INFO Les Watts 2003-01-17 13:10:11 UTC Re: [CAD_CAM_EDM_DRO] Re: X-Y Table, Rotary Table for CNC INFO ballendo <ballendo@y... 2003-01-17 20:15:28 UTC Re: X-Y Table, Rotary Table for CNC INFO ballendo <ballendo@y... 2003-01-17 20:18:34 UTC Re: X-Y Table, Rotary Table for CNC INFO Ray Henry 2003-01-18 10:24:37 UTC Re: Re: X-Y Table, Rotary Table for CNC INFO Andrew Werby 2003-01-18 13:00:12 UTC Re: X-Y Table, Rotary Table for CNC INFO ballendo <ballendo@y... 2003-01-18 22:18:48 UTC Re: X-Y Table, Rotary Table for CNC INFO turbulatordude <davemucha@j... 2003-01-19 06:52:44 UTC Re: X-Y Table, Rotary Table for CNC INFO Les Watts 2003-01-19 07:38:28 UTC Re: [CAD_CAM_EDM_DRO] Re: X-Y Table, Rotary Table for CNC INFO Doug Fortune 2003-01-19 08:59:32 UTC Re: [CAD_CAM_EDM_DRO] Re: X-Y Table, Rotary Table for CNC INFO Marv Frankel 2003-01-19 10:15:25 UTC Re: [CAD_CAM_EDM_DRO] Re: X-Y Table, Rotary Table for CNC INFO ballendo <ballendo@y... 2003-01-22 05:31:55 UTC Re: X-Y Table, Rotary Table for CNC INFO