Re: Need advice: MaxNC or Sherline or other or nothing

Hrm, I'm not sure I'm up to the job of manufacturing something so
complex. I mean, I would like to do it, but such a huge project is a
little out of my range right now. I did notice that the cost involved
was high, but likely well worth it considering what you get out.

I think, however, that I will go with a Taig mill. The 5.5" Y travel
is a >little< disapointing, but hopefully I can work around it. I
also remember seeing a page a long time ago about a bloke with a
sherline mill who separated the column from the base, made a few
mating/reinforcing parts, and slightly increased his Y travel (by
allowing more clearance to the column). Does anyone have any
recollection of the guy/modification I'm talking about?

But yeah, I think a Taig Mill, and then I'm not exactly sure what
I'll do for the CNC component yet... It looks like my options are:
1) MaxNC Closed Loop kit, w/ double stack motors. I hear the MaxNC
motion is resonably good, and its the rest of the mill hardware thats
a little iffy...
2) Taig CNC kit (If theyll sell me the parts, I found a deal on a CNC
ready Taig mill thatll save me a couple hundred...). Benefit here is
that they have 200 oz-in stepper.
3) IMService Kit-1 closed loop servo kit; not too expensive, and
servo motors, but they dont list their motor specs,which makes me
think they might have low accuracy encoders and low torque motors.
4) possibly some sort of ebay hardware. I would be up to wiring my
own controller and making some NEMA 23 adapter plates on the FADAL.
I'll probably enlist the help of my electronics-savvy buddies for
this...


If I do "compromise" and use a machine with ACME leadscrews, am I
going to get screwed up when trying to do circular interpolation?
That is, if I am cutting a circle, will it go crazy and wander
out .010" or more at the apex's (apecies?) of the circle relative to
X and Y ? I ask because I do plan to do a large amount of circular
interpolation.

Again, any advice or input is openly welcomed and would be greatly
appreciated.

Thanks,
Andrew Pullin

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "notoneleft" <ger21@c...>
wrote:

> Check out http://www.5bears.com
>
> Gerry
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "CrazyDudeII"

<apullin@h...>

> wrote:
> > Do you know of any good plans or sets of drawings out there for a
> > benchtop sized mill? I have thought before about fabricating
> > everything from scratch, but I fear that there would be too many
> > mechanical details I mightn't be able to get right (gibbs,
> spindle),
> > along with the difficulty of wiring up all the servo drivers (I
> > suppose I should use Gecko drives?)
> >
> > Thanks,
> > Andrew
> >
> > >
> > > [If you're up to fabricating things on a Fadal, then I think
> you'd
> > be better
> > > off designing and building a mill from scratch; you'd end up

with

> > just what
> > > you wanted, not a kludge of your parts and another solution's
> > inherited
> > > problems.]
> > >