The Shop > CNC

My desktop CNC router's first cuts

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MadModder:
So this morning I mounted the last end stop and ran the first test.
A little bit slow I guess. I could have doubled the feedrate. But hey, It's my first!  :clap:

Brass_Machine:
Nice!

Some more info on the router? Self build?

Eric

MadModder:
Thanks!

Yes it's a self build. Kind of.
There was this old guy (RIP...) I got to know through another forum, that made these kits.
He had a giant router with which he cut out parts for smaller ones. He sold the kits with MDF-parts (and HDF for the thinner parts), nuts'n'bolts, motors and motor controller.
We were quite a bunch buying kits, (9 years ago) but only a few ever assembled all the parts.
I helped him develop a newer version of the electronics afterwards, so I'm the only one having the upgrade.
The old ones don't have the enable signal to the motor controllers, so they're on all the time until you cut the power...
Aaaaaand my building pace has been very slow...

I modified the parts to my liking, painted them, assembled them, added some micro switches and electronics, shoved the cables through flexible conduit, and built this control/interface box:

Which has the PSU, a spindle relay, the break out board, motor controller (motor driver chips Allegro A3979SLP), emergency stop circuitry and everything else.
Connected with a parallell cable to the computer, running Mach3.

Here's a wider shot when I test the three axes.


It's as close to ABB robot-orange I could get.  :D

Three bipolar stepper motors (57STH41), M10 threaded rods as feed screws, and mostly backlash-free nuts out of delrin.
And the spindle motor is a Kress FME 800.

Biggles:
Nice one buddy, be interested in the details. :clap:

MadModder:
What kind of details do you want?
Spindle RPM ranges from 10000 to 30000.
Table size is 40x64cm.
X travel  is 30cm, Y travel is 49cm, Z travel is 8,5cm.
The Y length was shorter in the original plans, but my wish was to at least be able to engrave 19" front panels, and everybody agreed.
Because it's made out of wood, and the linear bearings are pipes and ball bearings, it's not sturdy enough to do metal milling. Copper laminate and aluminium engraving is the limit there I think.

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