Homebrew_PCBs

--- In Homebrew_PCBs@y..., "Tim Goldstein" <timg@k...> wrote:

> No, your question would not be considered off topic on the
> CAD_CAM_EDM_DRO group. It directly deals with the design and

building of

> a hobby CNC machine.

Thanks Tim, thats good to know.

> No direct experience with anti-backlash acme screws or a machine

based

> on linear bearings and rods, but I have done some PCB drilling on my
> Shoptask and on my Bridgeport. My resolution was on the Shoptask at

the

> time was .00025" and that worked out just fine. I would actually

venture

> a guess that you could get by with resolution in the .0005" - .001"
> range.

I've been doing some searching (see links below) and although I
havent yet found many Hobby PCB Routing/Drilling sites but the
commercial ones gave me some needed info. One unit that sells for
$6k+ uses 0.00025" resolution and says MIT, NASA, ATT... use their
products. With that in mind I agree that 0.0005" to 0.001" resolution
would be fine for hobby use. I'll probably start using the Gecko 201
drives I bought from you (10 microstep, info for others) and then use
it to make my own Drivers (probably L298 based) for this unit. It
will probably double as an engraver. Something else to play with. :)

I've also been emailng with Alan Marconett KM6VV whos also a member
of both groups.

>For the spindle I am a big fan of using a collet style Foredom
> flexshaft hand piece. This lets you mount the motor remotely so you

have

> a small light spindle on the machine and gives you a spindle speed

of

> 15,000 - 20,000 RPM depending upon the motor and handpiece you use.

It

> worked well for me when I used one in my Shoptask. I am now using a
> Precise 40,000 RPM spindle in the Bridgeport and that works even

better,

> but can be a little spendy.
>
> Tim
> [Denver, CO]
> Back-up CAD_CAM list mom

This is more of a For The Fun Of It Project and won't see a lot of
use so i'll be sticking to the RTX. But I agree that for frequent use
and greater speed the Foredom Flexshaft would be a much better option.

This project is also to get some Hands On experience with CNC,
Stepper Motors, Linear Motion, CAM Software... before I build my CNC
router, which is the reason I bought the Gecko's.

Thanks
mike

http://www.majosoft.com/

http://www.mutronic.de/e_diadrive2000.htm

http://www.pcbmilling.com/

http://www.morris.com.au/technical/w_nc.htm
Links at bottom for more

http://www.uslink.net/~cybercir/cir7.htm

http://www.geocities.com/CapeCanaveral/Lab/9643/TraceWidth.htm

http://www.industrycommunity.com/myforum/jw_childers/

http://www.aracnet.com/~gpatrick/

http://www.drillbitcity.com/

http://www.drilltechnology.com