Re: [CAD_CAM_EDM_DRO] 18 ft. router

Bring the wood into the house to get it down to 8% moisture or so, and the
seal it with west systems epoxy as soon as you make the parts. Won't
eliminate moisture uptake (nothing will) but it is the best way to slow it
down.

Brian

----- Original Message -----
From: "Douglas Pollard" <dougpol1@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, February 02, 2004 8:26 AM
Subject: [CAD_CAM_EDM_DRO] 18 ft. router


> I am in the process of building a large router out of oak as I already
have
> the material. Some on this list felt that expansion and contraction would
be
> a problem and I agree. I am thinking that I could put a rotary encoder on
> each axis with a piano wire running the length of the axis with a couple
of
> turns around the encoder. This would measure the expansion and contraction
> of the machine and I could enter this factor into my cam program to
> compensate.
> I plane to use rack and pinion drivers with the rack attached at one
end
> only to the machine. I am expecting that in this way the rack will not
> expand with the machine.
> The Y axis will only be 6ft so expansion will be much less than the
> 18ft. axis. Watcha all think.
> Doug Pollard
>
>
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