Re: Sanity check for homebrew CNC milling machine

Chris, Future (www.tslots.com) and 8020 (www.8020.net) have 2"x2" T-
slotted extrusions for 1/2 the price you mention. Their price lists
are on line.

The "not much more" was refering to total project cost. Seems like a
mistake to spend so much money on motors, drives, bearings, screws,
etc. then use MDF for the machine frame. I think the weight of the
MDF alone for the bridge will kill the performance of the machine not
to mention any other issues.

~petev

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Chris Cowley
<rotorheads@e...> wrote:

> i completely agree with your logic...
> but the best price i have seen for the extrusions is about $50

each. 4

> foot length if i recall. thats a long way from 10 bucks worth of

MDF...

>
> any more competitive sources?
>
>
> C Cowley
>
> On Wed, 2003-10-08 at 19:27, vavaroutsos wrote:
> > Arvid, take a look at some of the designs offered from the likes

of

> > www.campbelldesigns.com and others if you haven't already. I

think

> > you could build a better machine from aluminum extrusions for not
> > much more money than MDF. You want the rigidity on the bridge,

but

> > not the weight as F=MA.
> >
> > I have the following drive/servo motors for sale that seem like a
> > better match for your system, especially considering the

efficiency

> > or you leadscrews:
> >
> > 4 Yaskawa SGDA-04AS servo packs, 4 SGMP-04A3A4 servo motors, 4
> > DP9320089-2 servo pack to motor encoder cables, and programming
> > software for sale. All are brand new. The motors are 400W

(0.53HP),

> > 3000 RPM continuous, 4500 RPM max, 181 oz/in continuous, and have
> > 2048ppr encoders. You can get more info at www.yaskawa.com or

contact

> > me and I can email the specs in PDF format (large file). A power
> > supply is not needed with servo packs as it's built in. $1300

takes

> > everything.
> >
> big bandwidth saving <snip>