CAD CAM EDM DRO - Yahoo Group Archive

Re: [CAD_CAM_EDM_DRO] Re: Re: Belt vs. Direct Drive

Posted by alex
on 2003-01-04 16:24:30 UTC
Granted - climb milling is a special case. I remember I broke a mill bit
even on
a huge hydraulic mill - don't remember what make, it was 25 years ago.
(this contributed to my search for a new career).
It probably can be avoided in a CAM. Don't think Bridgeport will do climb
milling.
This requires extremely rigid machine.
Alex
----- Original Message -----
From: Tim Goldstein <timg@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, January 04, 2003 1:38 PM
Subject: RE: [CAD_CAM_EDM_DRO] Re: Re: Belt vs. Direct Drive


> Maybe on all issues but climb milling. The spindle is pulling you to one
> side of the lash, the table motion is pushing you to the other. Short of
> a closed look linear encoder how are you going to have any idea where in
> the range of play you are? With a closed loop you can have severe
> stability problems and it sure defeat the cheap approach.
>
> This is not to say that it is not worth building a cheap crude machine.
> It can be a great starting point for a biginner. Just don't expect any
> miracle in software will turn it into a precision unit. Vaporware does
> not count.
>
> Tim
> [Denver, CO]
> Sherline products at Deep Discount
> Mach1 & DeskCNC with credit card ordering
> www.KTMarketing.com/Sherline
>
> > -----Original Message-----
> >
> > At 02:36 04/01/2003 +0000, you wrote:
> > >No. You still have the problem of the backlash when you
> > climb mill and
> > >it never works perfect when you do circles.
> > >
> > >Tim
> > >[Denver, CO]
> > >Sherline products at Deep Discount
> > >Mach1 & DeskCNC with Credit Card ordering
> > www.KTMarketing.com/Sherline
> > >www.KTMarketing.com/DeskCNC
> > >
> > >----- Original Message -----
> > > > In this respect I wonder if it is possible to build a very crude
> > > > machine, with a worst possible screws and backlash everywhere and
> > > > try to compensate for it in a software to the point of an
> > accurate
> > > > machine? Alex
> >
> > Tim -
> >
> > That is only because the crude approximations to backlash
> > compensation
> > start with the assumptions that:
> >
> > (a) a given program will not do both climb milling and
> > "normal" milling, and
> > (b) the backlash is constant over the travel of a given leadscrew, and
> > (c) the backlash value is accurately known.
> >
> > It would be possible to provide sufficient information to the control
> > software to allow it to do a significantly better job of backlash
> > compensation than most controls manage currently; however, the real
> > question is whether it is a worthwhile thing to do, given the
> > alternative
> > of building a better machine to start with.
> >
> >
> > Regards,
> > Tony
>
>
>
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Discussion Thread

dennis_kramer2001 <dennis.kramer@a... 2003-01-02 17:14:08 UTC Belt vs. Direct Drive Robert Campbell 2003-01-02 17:51:28 UTC Re: [CAD_CAM_EDM_DRO] Belt vs. Direct Drive Doug Fortune 2003-01-02 18:51:25 UTC Re: [CAD_CAM_EDM_DRO] Belt vs. Direct Drive Chris Baugher 2003-01-02 19:18:13 UTC Re: [CAD_CAM_EDM_DRO] Belt vs. Direct Drive Doug Fortune 2003-01-03 01:11:21 UTC Re: [CAD_CAM_EDM_DRO] Belt vs. Direct Drive Tony Jeffree <tony@j... 2003-01-03 01:17:12 UTC Re: Belt vs. Direct Drive jeffalanp <xylotex@h... 2003-01-03 01:19:14 UTC Re: Belt vs. Direct Drive torsten98001 <torsten@g... 2003-01-03 03:02:04 UTC Re: Belt vs. Direct Drive bjammin@i... 2003-01-03 07:26:21 UTC Re: [CAD_CAM_EDM_DRO] Re: Belt vs. Direct Drive Marv Frankel 2003-01-03 08:06:06 UTC Re: [CAD_CAM_EDM_DRO] Re: Belt vs. Direct Drive Garry & Maxine Foster 2003-01-03 08:27:42 UTC Re: [CAD_CAM_EDM_DRO] Re: Belt vs. Direct Drive CL 2003-01-03 10:58:51 UTC Re: [CAD_CAM_EDM_DRO] Belt vs. Direct Drive CL 2003-01-03 11:23:46 UTC Re: [CAD_CAM_EDM_DRO] Re: Belt vs. Direct Drive alex 2003-01-03 11:34:58 UTC Re: [CAD_CAM_EDM_DRO] Re: Belt vs. Direct Drive Tim Goldstein 2003-01-03 11:46:55 UTC Re: [CAD_CAM_EDM_DRO] Re: Belt vs. Direct Drive Chris Baugher 2003-01-03 12:13:01 UTC Re: [CAD_CAM_EDM_DRO] Belt vs. Direct Drive Chris Baugher 2003-01-03 18:31:50 UTC Re: [CAD_CAM_EDM_DRO] Re: Belt vs. Direct Drive jeffalanp <xylotex@h... 2003-01-03 18:43:49 UTC Re: Belt vs. Direct Drive Tony Jeffree 2003-01-03 21:51:52 UTC Re: Re: Belt vs. Direct Drive Tony Jeffree 2003-01-03 22:14:42 UTC Re: Re: Belt vs. Direct Drive bjammin@i... 2003-01-04 00:00:29 UTC Re: [CAD_CAM_EDM_DRO] Re: Belt vs. Direct Drive Tim Goldstein 2003-01-04 10:38:57 UTC RE: [CAD_CAM_EDM_DRO] Re: Re: Belt vs. Direct Drive alex 2003-01-04 16:24:30 UTC Re: [CAD_CAM_EDM_DRO] Re: Re: Belt vs. Direct Drive Ron Kline 2003-01-04 16:58:01 UTC Re: [CAD_CAM_EDM_DRO] Re: Re: Belt vs. Direct Drive alex 2003-01-04 17:33:13 UTC Re: [CAD_CAM_EDM_DRO] Re: Re: Belt vs. Direct Drive jwalters 2003-01-04 18:13:50 UTC Re: [CAD_CAM_EDM_DRO] Re: Re: Belt vs. Direct Drive Dave Kowalczyk <dkowalcz@d... 2003-01-04 18:53:19 UTC Re: Belt vs. Direct Drive Ron Kline 2003-01-04 20:11:18 UTC Re: [CAD_CAM_EDM_DRO] Re: Re: Belt vs. Direct Drive Jon Elson 2003-01-04 22:26:08 UTC Re: [CAD_CAM_EDM_DRO] Re: Re: Belt vs. Direct Drive alex 2003-01-05 15:45:13 UTC Re: [CAD_CAM_EDM_DRO] Re: Re: Belt vs. Direct Drive Jon Elson 2003-01-05 23:12:49 UTC Re: [CAD_CAM_EDM_DRO] Re: Re: Belt vs. Direct Drive alex 2003-01-08 08:12:32 UTC Re: [CAD_CAM_EDM_DRO] Re: Re: Belt vs. Direct Drive Jon Elson 2003-01-08 23:26:42 UTC Re: [CAD_CAM_EDM_DRO] Re: Re: Belt vs. Direct Drive