[SML] question for router wizards

[Jon Lagerquist]

If I was cutting that here I would frame up an ellipsograph to make at
least one cut, or all of them. Keeping ellipses concentric (equal
distance at each point) is trickier than just increasing the major and
minor axis, so a base on the router sounds like a good path.

It sounds like each cut is a small distance out, so a set of rings would
be easy to produce. For ease of interchangeability and mounting I might
make disks with a center hole that you could drop a guide collar into.
So a 1/2" diameter bit, a 3/4" guide collar, a 4-1/4" disk with a 3/4"
center hole and your are set.

Jon

On 12/17/2016 8:08 AM, Bill Conner via Stagecraft wrote:
> I want to router cut some ply.  The shape is composed of several
> different ellipses but shouldn't matter.  I plan to make a template of
> mdf - this is in the range of 4 x 10 feet - and I'd like to cut
> "concentric" versions of the shape all within 2-3 inches of the
> smallest.  I thought I'd make template based on stock router base and
> smallest piece, and for larger, make larger round router bases.  I
> never for a second thought this was a new idea so went googling and
> can't find anything on doing this.  Lots of different sub bases - but
> none that would follow a template on this scale. I could look at two
> rollers or pins but seems nothing would be as simple and safe and
> accurate as larger round bases.
> 
> Probably missing the obvious, but most seem much more expensive for a
> one time diy home project.
> 

-- 
Jon Lagerquist
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