Re: [CAD_CAM_EDM_DRO] router designs

In a message dated 14-Aug-01 14:35:34 Central Daylight Time, alexg@...
writes:

>
> Do you have any more pictures from the other side of the table ?? Sadly,

no. I made prints for my album here, but DELeted them in computer-memory and
camera-card.

> did you drive the X axys ? I could not figure out by the picture. The
> X-axis is driven by a lead-screw in the rear of the box, just below the
> top-surface. you can see the X stepper-motor on the rear-right corner of
> the box.

> drive just at one side ? The X-screw, behind, as described above,
> is driven

from the right-end, only, as I said. The Y-axis-support rails (hard round
shafts) are supported by linear bearings at both ends, as you can
see, and the Y-stepper-motor is on the rear, behind the rear
bearing-pillow-block with the cable plugged into a junction-box (black) at
the top. That Y-screw is visible to the left of the left shaft-way. The
Y-motor is not really visible, but is directly connected to this Y-screw on
the rear, behind the alum. block in the rear.

Doesn't the table stop at the other side ? I do not understand this
question. The X-Y table (white, top of the box, under the quill) is only
what you can see in the photo. The X-axis stops against the X-stepper-motor
on the right, and a "block" on the left, behind, out of view.

The Y-axis obviously stops on either alum. block holding the
X-linear-bearings and the Y-way-shafts.

The drill-motor is a 115 V, 400 Hz. "aircraft instrument motor", which turns
at 12,000 RPM. 95 Watt. So, just enough torque for drilling with carbide
PC-board drill-bits, all of which have 1/8" (3.175 mm) shanks. The little
blue motor atop the quill is a 72 RPM "Slo-Syn" motor which is the "Z-feed
motor", causing downward (drilling) feed about 5 mm. travel.

The 400 Hz. power for this 12,000 RPM motor is developed by means of an
inverter-circuit with self-made 400 Hz transformers. A simple square-wave
oscillator drives "push-pull" power-transistors which "feed" this
transformer. The output is 115 VAC/400 Hz, but this is not very
"high-fidelity" sine-wave, but the little motor doesn't care!

If you have specific questions about this, feel free to e-mail me off-line.
I do not reliably "visit" the CAD_CAM_ site every night.

Jan Rowland



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