>
>
> Bill,
>
>
>
> That's an excellent idea. But it would take something with considerable
> density. In the system I've been working on I was planning on running a
> cable down through the column, through the bench top, to a cluster of 4"
> PCV tubes arranged vertically. I'd been planning on filling the tubes
> with lead shotgun shot, which would give me the ability to precisely
> adjust the weight (I was going to use a cluster of tubes rather than a
> single tube so that I can keep the vertical dimension down). Looking at
> the volume of a standard 25 pound bag of lead shot, I'd guess that there
> wouldn't be room for 2+ bags (actually, the volume of same) inside the
> column – but that's such a good idea that I'll do some measurements and
> report back.
>
>
>
> In the meantime, another problem would be keeping an internal weight
> from rubbing against the sides of the column. Anyone have any ideas?
>
>
>
> Rob
Well Rob, I was actually considering how to counterbalance the head on
my Sears & Roebuck drill press! This has a tubular column that is
reasonably well finished inside. Having a good supply of lead on hand I
thought to cast a counterweight in the form of a cylinder that loosely
fitted the tube. This provides the additional advantage of a pneumatic
damper on the head movement! Since I have a floor drill press the travel
available is enough to allow for half the weight and double the travel!
The secret to this approach is in a thin, flexible, cable with enough
strength to do the job! I have not seen the inside of a minimill column
but I suspect that there might well be enough height to let a weight
have twice the head travel! Take some measurements and let us know!
Bill in Boulder
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