RE: [CAD_CAM_EDM_DRO] DenverCNC?

Tim,

Most of my experience has come from 1/2 step drives so some of my comments
may not be relevant to a micro stepping drive.

I am sure that the DenverCNC system and the 114oz/in motors have been
thoroughly tested by yourself and others, and has been found to be a good
match with the Taig mill.

Therefore I shall stand (or sit) corrected.

Cheers,


Peter Homann
mailto:Peter.Homann@...
Adacel Technologies Limited,
250 Bay St, BRIGHTON, 3186, AUSTRALIA
http://www.adacel.com <http://www.adacel.com>
Telephone +61 (3) 8530 7777, Facsimile +61 (3) 9596 2960
Mobile 0421-601 665

> -----Original Message-----
> From: Tim Goldstein [mailto:timg@...]
> Sent: Tuesday, 28 October 2003 11:00 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: RE: [CAD_CAM_EDM_DRO] DenverCNC?
>
>
> > Derek,
> >
> > My suggested motor rating comes from being involved with the
> > taigtools list for a number of years. A lot of people have
> > done there own Taig conversions and those that have used the
> > larger motors (~200oz/in) seem to be the happiest. Also the
> > fact that Taig supply these motors on their CNC mill gives you a clue.
> >
> >
> > Peter Homann
>
> Peter,
>
> I was also a big proponent of 200 oz/in motors on table top machines.
> What I have found is that my experience was based on the then current
> state of hobby drives with half step controllers. Now that I have gone
> to microstep drives I am amazed at how well the smaller motors are able
> to drive the mill. With the new experience I have revised my advise. You
> can now get a very solid and reliable CNC setup on a Taig or a Sherline
> with a good quality motor just over 100 oz/in if you use a microstep
> drive and at least a 10X over voltage on the drive (meaning you are
> using a current limiting drive). Now if you have high inductance motors
> or are using a 1/4 or half step controller I still agree with the 200
> oz/in suggestion. As I have learned I have found that there is far more
> to making a solid and reliable system than just specifying a motor
> holding torque. Motor inductance, over voltage, microstepping, pulse
> stream pacing, and more all enter into the picture. There are also cases
> where I have gotten better performance from a smaller motor than a
> torquier motor because of the higher inductance of the beefier motor.
>
> Bottom line is that one parameter does not define whether a system will
> be reliable or not.
>
> Tim
> [Denver, CO]
> Sherline & Taig products at Deep Discount
> Mach1 & DeskCNC with credit card ordering
> www.KTMarketing.com/Sherline
> e-mail me at Timg @ KTMarketing.com for items not yet listed
>
>
>
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