Hi N/a.

You do not show, in your profile, what router you own.

Can't you just buy the cutters in 1/4" or 1/2" shank to suit the jig.

If you have a 1/2" router, I think you can buy reducer sleeves from 1/2" to 8 mm

Wealden Tool Company Limited Collet Reducer Sleeves

 

That's a pretty small router for cutting dovetails. Did a quick search but didn't find anything about it being able to take an 8mm collet.

Dovetail jigs demand a lot from routers and bits, you might want to consider using a router with more power and a 1/2" collet with an 8mm collet available or an adapter to reduce 1/2" to 8MM.

HTH,
Bill

 

Leigh jigs require 8mm shank bits. A collet reducer is available from Leigh and many other sources. It reduces 1/2" to 8mm and it works fine. I agree though about the power of the router. I just bought a 2 1/4 hp router and what a difference from my 1 1/2hp.

 

Lee Valley also makes an 8mm collet adapter since some bits seem to be only available in 8mm. I've got a couple and the only problem is trying to figure out if that's a 1/4 or 8mm shank (my eyes aren't what they used to be, neither is my brain.)

 

My superjig is about 5 years old, and came with 8mm Leigh bits and a 1/2" to 8mm reducer. Third party 1/4" shank bits are available but the reduced shank cross section makes them a lot less rigid and more prone to chatter, which is not good for a system as good as the Leigh.

 

Try here, Collets & Tool Holding - Collets and Adapters - Soigeneris.com

 

16 PC 8mm Shank Dovetail Router Bit Set for Leigh Jig | eBay


===