Gordon Ward on sat 10 sep 05
The vacuum adjustment is usually accomplished with a bleeder valve
anywhere between the vacuum cup and the pump. Here is an article on
building a vacuum chuck for a lathe which might give some ideas. This
fellow has a cheap source for a vacuum pump if you don't want to use or
don't have a deairing pug mill.
http://www.beaverpondstudio.com/Vacuum_Chuck.html
Gordon
On Sep 10, 2005, at 11:31 AM, jesse hull wrote:
> Why not just "dial down" the OUTPUT of the pump?
> You don't need a pump that can be switched in terms of
> how much it "pulls". If you're building your own, the
> parts you'll more than likely be using are
> PVC/Irrigation components normally used on municipal
> supply water hose systems. You can get pieces at
> horticultural centers or, e.g., Home Depot that would
> allow you to increase/ decrease the flow the pump is
> allowed to push out. Using a simple device like this
> will do away with settings altogether, working more
> like an infinity switch.
>
> ~_jessehull_.
>
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