Re: spindle counterweights

Correct me if I'm wrong but things in motion tend to stay in motion
whether in a straight line or a loop. You can use springs but need to
build an arm that changes the angle, thus spring rate through it's
travel. The best example would be on the lines of what is used to
balance a car hood. Or air cylinders on late model hatch backs. Look
at the geometry used to maintain a constant spring rate. That is what
I did on my Z axis. I have 12 inchs of travel which float prefectly
balanced. Keep it simple,... And remember the wheel was already
invented. My camera's broke, can't send a photo. Sorry

--- In CAD_CAM_EDM_DRO@y..., "Smoke" <smoke@t...> wrote:
> If you design the Z axis properly using a cable it will work just
fine.
> The cable should be fixed at both ends to BOTH the cutting head
assembly and
> the counterweight, thereby forming a 360 degree loop. This would
eliminate
> the counterweight acceleration/deceleration problems encountered on
the
> other machine being discussed.
>
> Smoke
>
> > I just joined this group after following it for a couple of weeks.
> > I'm in the process of assembling a CNC router. The Z
> > axis will be fairly heavy as I plan on using a 3 1/4 hp router
head.
> > My plan is to use a pneumatic cylinder to balance the weight on
the Z
> > axis. The cylinder will be connected to a small surge tank. The
> > pressures will be controlled by a regulator with pressure guage.
> > Hopefully the system will be tight enough so that an external air
> > supply will not normally be required. Has anyone tried this
system
> > and/or do you have any alternate suggestions? Bob Lemon
> >
> >
> >
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