On Dec 6, 2020, at 10:27 AM, tom@... wrote:

?Hi Jonathan!?

I haven't had a chance to use the Aigner/Felder circle cutting jig quite yet, but here are my impressions based on handling it:

-- Jig is made out of machined baltic birch -style plywood and steel.?
-- Jig ships in three basic parts: Primary part of the jig, a support piece, and a wrench
-- Primary part of the jig attaches to aluminum table extension (Aigner or Felder) via a steel bar that slides into the t-slot, fastened through the top of the jig using the supplied spanner wrench
-- The support piece uses a pair of magnets to fasten to the cast iron top. I've seen some photos that indicate that, at least at one time, there was a version that attached to the Aigner or Felder mounting bars, so there may be multiple versions out there
-- The spanner wrench has a little steel tube welded on to the top, which holds the hardware for fastening the material to the jig, either a sharp brad point, or a 8mm stud. Either hardware is fixed to the jig via a threaded stud.?
-- The jig can be flipped upside down to accommodate different feed directions. For instance, the jig can swing "left-to-right" for a band saw, or "right-to-left" for a shaper or edge sander.?
-- Using the Felder aluminum table extension (1m), it looks like maximum cutting diameter is in the ~48"-50" range, at least on my saw. I'm aware that the Aigner table extensions can be linked together, so with that setup your diameter is limited by your available shop space.....
-- I primarily intend to use this jig on my band saw, but I can see some interesting uses with a shaper and/or oscillating edge sander.?

I hope this helps!

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Tom Gensmer
Heritage Home Renewals, LLC
Minneapolis, MN

On Dec 6, 2020, at 1:43 PM, tom@... wrote:

?Philip, the trick is getting the blade into the material to make the cut. Having a fixed, sliding t-nut would require cutting the square blank to the exact finished diameter, then perfectly centering it on the t-nut. There are numerous circle-cutting jigs on the market, most of them have some sort of "swing" element that sweeps the work into the blade, then rotates around a fixed point. This allows you to slightly oversize your square blank, and being perfectly centered is less critical.?

The appeal to me of the Aigner/Felder jig is how simple it is, and how well it integrates into the table extensions. The other candidate I considered was the Carter jig, but then I'd be tied to only using on a band saw (with standard 3/8"x3/4" miter slot), whereas the Aigner/Felder jigs works on any machine you can mount a table extension to (bandsaw, edge sander, shaper, router table, etc....). Everybody's wants/needs are going to be different, for me it was more than worth it to buy the ready-made solution.?

https://us.feldershop.com/en-US/en-US/en-US/en-US/Sawing/Accessories/Bandsaw-accessories/Circular-cutting-device-Circular-mill-facility.html?force_sid=mttpv6438efkmn9dpo94516vg1
--
Tom Gensmer
Heritage Home Renewals, LLC
Minneapolis, MN