Re: 1800 ipm router..

Dan,

I think you're probably right, and Mariss posted on my DIY-CNC group
about some other engineering based speculation regarding motors.

How much nicer to just be given the answers to these basics?

It's kind of like seeing a racecar win a race and then being told,
when asked what's under the hood, "It may change, so we won't say"

I hear from the grapevine some feel I'm trying to get Ron to reverse
engineer his product for us/me.

No need there. I have enough knowledge to design my own, and as we
can see from Dan and Mariss's post's, reverse engineering
without "help" is easy to do. Beside's that, Ron's goals and mine
would seem to be at opposite ends of the CNC continuum.

I do want to point out one thing about drive methods; we often
assume that all lead/ballscrews are gonna be something like the
common 10 or 5TPI. But that's not necessarily the best choice in
many applications. (Never forget that MANY more ballscrews are used
for their reduced friction than for their mechanical accuracy in
positioning. So the "common" sizes may not have much at all to do
with CNC apps. But rather come from what works well for an
actuator/positioner.)

You can get excellent efficiency from a leadscrew with high helix
(large lead). This reduces rotational speed needed, and the
increased efficiency provides compensatory gains in the area of
torque multiplication, which you've given up by going with the high
lead in the first place.

IOW, consider that a high lead screw could attain these speeds
economically. There are more than a few commercial machines which
use a high lead screw drive.

Dennis Bohlke had such a design on his super-tech website when he
was first starting out.

I'm pretty sure Grummy at Data-cut goes into this a bit in his
planset as well.

Nookind.com is a good place to study the realities of lead and ball
screws.

Hope this helps,

Ballendo

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Dan Mauch" <dmauch@...>
wrote:

>
> It would have to be rack and pinion drive. . With a 1" PD pinion

the travel

> would be
> 1800/3.1416=572 RPM so with a servo motor and a 3/1 reduction the

motor

> would only have to run about 1718 RPM.
> A ballscrew or rotating ball nut wouldn't make much sense from a

mechanical

> efficiency point of view.
> My bet is on a rack and pinion
> Dan Mauch
> low cost stepper and servo motors.
> cases for Gecko drives
> kits and assembled 3-4 axis drives
> www.camtronics-cnc.com
> www.seanet.com/~dmauch
> ----- Original Message -----
> From: "ballendo" <ballendo@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Saturday, May 20, 2006 9:57 PM
> Subject: [CAD_CAM_EDM_DRO] Re: 1800 ipm router..
>
>
> > Could be.
> >
> > So far he's dodged my request for answers about the drive setup,
> > saying the details may change before release, and be therefore

moot.

> >
> > I just want to know what is driving what I'm looking at in the

video;

> > I care not what the final version is/will be. just tell us what's
> > being used in the video...
> >
> > Ballendo
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "David Bloomfield"
> > <davidbloomfield@> wrote:
> >>
> >> My bet is that he's using timing belts with servos. It seems

almost

> >> too quiet for any other type of drive system
> >>
> >
> >
> >
> >
> >
> >
> >
> > Addresses:
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