Re: Cutting forces and Acetal nuts

--- In CAD_CAM_EDM_DRO@yahoogroups.com, JanRwl@A... wrote:

> In a message dated 9/28/2003 7:04:03 PM Central Standard Time,
> arvidpublic@h... writes:
>
> > to be <$1000. So, does this sound reasonable?
> >
> IF you can get most of your hardware and lead-screws essentially

FREE of

> charge! If new ball-screws, those, alone, for this size of a

Router Table can

> approach $1000!

Yes, I am aware that ballscrews are way up there, so that's why I
want to go with ACME and acetal nuts instead.


I have never done anything with servos, so I can't comment,

> there. But if you designed with appropriate Size 34 bipolar

steppers and GOOD

> chopper-drives, those alone would be MORE than $1000!

The motors will be servos (not steppers) of some kind, surplus, and
I'm expecting to pay about $500 incl shipping for two or three of
these (without drivers/amplifiers).

>
> Linear "ball ways" and THK linear bearings, or even Thomson "Class

L" round

> ways and linear ball-bearings for such can be at least several

hundred for this

> size of a project!

I have "precision" round ways and linear ball bearings for the
largest axis already, but I want to evaluate these before I invest in
linear guides for the rest of the axes. (I have to find a way to
mount these rigidly enough - perhaps I will sacrifice some travel and
add a support in the middle of the ways in addition to at the ends.)


I built an "X-Y router" with a working-area of 1.5 x 3

> meter, and a Z-travel of about 300 mm, with a 3.5 hp. 3Ø-400 Hz

router (and

> power-converter/generator), large Superior Electric steppers and

driver-boxes,

> Thomson round-ways and linear bearings, and NOT counting the table-

frame

> itself, I was "out" $35,000. New (professional) stuff like this

costs money FAST!

> Jan Rowland
>

Thank you for your input! Now I can feel really proud if I manage to
build an acceptable system on my budget :)

// Arvid