Re: Digest Number 315

Darrell,

Constant contouring does most of what you are asking for. CncPro has
constant contouring.

Bob

----- Original Message -----
From: Darrell <dgehlsen@...>
To: <CAD_CAM_EDM_DRO@onelist.com>
Sent: Tuesday, January 18, 2000 2:11 PM
Subject: Re: [CAD_CAM_EDM_DRO] Digest Number 315


> From: "Darrell" <dgehlsen@...>
>
> Well said Ron.
> What is needed for us stepper hold outs is a G code that would allow us to
> have the program ramp the steppers up to speed and then not ramp down and
> back up between moves until a G code is given telling the control to begin
> ramping again.
> What this would allow is servo like motion for moves like a tool path that
> is a square with the corners radiused so that the path is a line followed
by
> a tangent arc followed by a line tangent to that arc etc.
> It would also work with the situation where the G code is a large series
of
> very short segments that have a very small direction change such as an arc
> that has been interpolated into line segments. All that would be needed to
> make it work in this case would be a lead in and lead out move long enough
> to get the steppers up to speed before starting into the short segments.
> Bridgeport BOSS 5 and 6 have just such a G code called Deceleration
Override
> so it must not be that hard to do.
> Darrell
>
> ----- Original Message -----
> From: Ron Ginger <ginger@...>
> To: <CAD_CAM_EDM_DRO@onelist.com>
> Sent: Tuesday, January 18, 2000 11:24 AM
> Subject: Re: [CAD_CAM_EDM_DRO] Digest Number 315
>
>
> > From: Ron Ginger <ginger@...>
> >
> > I think this servo vs steppers is getting a bit nuts- It is a fact that
> > there are many thousands of systems in service with stepper motors that
> > do a very good job. This ranges from tiny motors moving ink jet printer
> > heads to big ones movnig industrial size tables under big machines.
> >
> > If the motor is run within its design limits, it does NOT loose steps.
> > PERIOD.
> >
> > Jon described the situtation where a servo system 'hits the wall' and
> > breaks a tool or some such and says the servo doenst loose it positon-
> > so what, the tool is broken, the work is likely ruined anyway.
> >
> > Trying to take a stepper and make it into a servo is a waste of time and
> > effort. If you want a system that can be built within the design limits
> > of a stepper, it will be considerably cheaper, simpler, more stable in
> > operation and probably longer lived than servos. Just use good steppers
> > and carefull enginering and strt making parts.
> >
> > If you want the highest possible speed, then the job equires servos, so
> > bite the bullet and buy the servos and amps and controllers and get on
> > with it.
> >
> > Trying to make a stepper into a servo is about like trying to make a
> > flying automobile, sure it could be done, but why bother.
> >
> > ron
> >
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> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
discussion of shop built systems in the above catagories.
> To Unsubscribe, read archives, change to or from digest.
> Go to: http://www.onelist.com/isregistered.cgi
> Log on, and you will go to Member Center, and you can make changes there.
> For the FAQ, go to http://www.ktmarketing.com/faq.html
> bill,
> List Manager