On 12 April 2018 at 13:27, Todd Zuercher <to...@pgrahamdunn.com> wrote:

> If you want to try multiple drive motors, a rack and pinion becomes a very 
> good option.

You can make quite a nice actuator reasonably easily by using a gear
on the motor spindle and a round rack running in suitable bushings.
(It is titled "1.5mod" but the table has sizes between 1.0 and 5.0 mod)

I used that arrangement back when I was much less well equipped with
machine tools by welding two short pipes together in a cross with a
pinion running in one pipe and the rack sliding in the other, both
with oilite bushings.

"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
— George Fitch, Atlanta Constitution Newspaper, 1916

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