Re: [CAD_CAM_EDM_DRO] Air assist on Series II knee?

Hello Tim
I suggest there is a air or hydraulic cilinder driven by a air converter
to counterbalance the weight of the knee.
This is the feature you find in many machines to ease work and
the z motor. You adjust the presure to the point that the knee is free floting.
Good Luck
Sven Peter

Tim Goldstein wrote:

> I snuck in a little more time tonight working on Bridgett. Got the X axis to
> travel the full length. Found I have a problem with the sliding metal
> shields on the right side. They want to fall away from the table when doing
> a positive X move and don't want to move together real well when doing a
> negative X move. Looks like the part that is suppose to be screwed to the
> table is just floating loose and causing the problem. The X axis is also
> doing about 30 ipm with the Camtronics at 3 or so amps and 24 V. Got the Z
> axis moving also. I didn't hook up the air to the knee as the hose from the
> regulator to the fitting at the bottom of the knee pedestal has deteriorated
> to the point that it is broken in many places and has enough crack that a
> screen door is more air tight. Not a big deal to replace. The Camtronics
> controller had the knee moving up without air at about 15 ipm. I am pretty
> impressed as the voltage and amperage is set real low. Well, this leads me
> to my question.
>
> How does the air assist on the knee work? Looking at the pedestal there is
> the air fitting entering the base at the back. at the top of the pedestal
> there is a fitting with the lubricator line and a about 3" diameter
> accordion covering going all the way to the top of the knee ball screw and
> it contains the ball screw. Poking at the accordion covering very gently all
> I can feel underneath is the ball screw. Is there an actual cylinder in this
> thing somewhere? When I replace the airline and apply air will a coaxial
> cylinder magically rise surrounding the ball screw?
>
> Tim
> [Denver, CO]
>
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