Re: [CAD_CAM_EDM_DRO] Linear rail & ball screw size suggestions

In a message dated 10-Apr-02 23:56:45 Central Daylight Time, js3mc@...
writes:

> In regards to your experience with trim routers, is it worthwhile or should
> I go with a larger router to begin with? Cost of
> the router is not the issue just size. Maybe that should not be a concern
> at all. How was the Makita better? What was is it used for on you machine?<<
>

Jay: Laminate-trim routers are "just as good" as "big ones"; just smaller,
less hp. If your loading will not exceed the smaller motor's capacity, that
would be MY choice, if a "universal" motor (the kind with brushes and sparks)
is used. Perske makes smaller 400 Hz. versions, but I haven't looked at
their catalog in over a decade, so I don't know if they have "anything new",
now. The smaller ones I recall were rectangular-housing motors, not round,
like those larger than one or two hp. Their rotary freq. converters were
huge, and they also sold "static" versions, but somehow, I think the rotary
ones are the better choice, if $$ is not the prime factor.

In an "ordinary universal-motor router", Makita is simply vastly better
workmanship than just about all U.S. makes, with the possible exception of
the red Milwaukee motors, which seem "just as good" (but very expensive for
"same size"!!!)

The machines I made were for routing 8 mm. ctr.-to-ctr. slots with a carbide
7/32" dia. straight bit (solid spiral, up-cut bit is vastly better!) in wood
for making pipe-organ keys. There are 122 such slots in a keyboard (61 on
top, 61 on bottom), and many round holes, too, and I used the router for the
holes, too, using half-wave "AC" (single 10-amp Si. diode in series with
router motor), as "router speed" is not necessary to drill holes. These
machines had a single axis (movement of router was "West to East" only), the
motor stopping on fixed (indexed) centers for each location. The workpiece
(unfinished keyboard) fastened to the table below "jiggled" 8 mm. "North to
South" to make the slots as the bit came down.

Lemme know if further questions! Jan Rowland Old Troll with
attitude

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