Re: Van Norman #12 Milling Machine

You would need a LONG cylinder so that the relative length do not change too much.

I have been playing with the idea of using very large and LONG springs for the same reason.

Another possibility is to use a short spring or air cylinder but let it work over a variable pitch pulley so the resultant force
is linear.
Bertho Boman
===============================

> From: PTENGIN@...
>
> In a message dated 01/23/2000 8:26:26 PM Hawaiian Standard Time,
> jmelson@... writes:
>
> << Unfortunately, those would be BIG gas springs. Maybe, one could come up
> with old oleo struts from aircraft landing gear. That would be about the
> right size.
>
> Jon
> >>
> Jon,
>
> How do they keep the force more or less constant on those gas springs? I
> also considered pneumatic cylinders. However, like a regular spring, the rate
> changes depending on where in the travel you are. I considered a regulator
> but then you need a compressor to admit when low and the regulator to dump
> when over pressure. Maybe if we got a really large cylinder and ran low
> pressure.....
>
> Peter
> THRD, Inc.