MFS for circle routing

[Kodi Crescent]

I just tried the MFS yesterday for circle routing.  I have a question about how the aluminum block with the circle works that is used for cutting circles. 

Is there a router attachment that fits neatly in that and takes up the full width of that thing?  I was using a MFK 700 with the largest bushing I could find, and there was still some play between the bushing and the edges of the circle block.  I had to rig up something to clamp the router in place so that my circle wasn't all wacky.

Am I missing an attachment or some other centering device for this?  Is this not intended for use with the MFK 700?

 

[Les]

Check out Brice's MFS Manual.

 

[Brice Burrell]

You need a 30mm copy ring (guide bushing) to fit the aluminum block.  Another option if you don't have a 30mm copy ring is use any guide bushing and pinch the bushing with the width of the MFS profiles and set the length of the your diameter.  But remember you'll need to carefully measure to get the correct offset to set the length to.  Let me know if that makes sense.

 

[Jesse Cloud]

I think the MFS is meant for a plunge router, and it needs a good length of plunge to get past the jig.  Maybe you could make it work with the MFK 700, but I don't see how offhand.  It works great with the OF1400.

 

[nickao]

I find that MFS for circles kind of cumbersome and a hassle to get EXACT circles quickly. I do agree with Jesse that it sure seems like it was designed for a plunge router in mind as most circle jigs are.

If you have an MFS I guess using it for circles makes sense, but if one wants a serious circle making jig this is the best I personally have used to date:

http://microfence.com/circle-jigs-c-23.html?osCsid=9e26ead0ee3d63f595d24b4b0c706b91