Bosch MR 23 and Milescraft Turnlock base?
I have a Bosch MRC23/MRP23/MRF23 router, and a Milescraft Turnlock base. They do not obviously fit together.
Before I start experimenting and mar the base plate to where it is no longer returnable, has anybody successfully mounted this base centered (and solidly) on this router?
Of course, I could try drilling new holes, but it would also be nice to know if anybody here has succeeded (or failed, more importantly) to do it that way.
Also, about maximum cutter diameter in a brass guide bushing: The manual lists 1/4" as the max cutter size for a 3/8" guide bush specified to have a 5/16" ID. It does just fit with minimal margin, but given the slack in all the moving parts between base and collet (not to mention pressure put on the guide bushing and its plastic frame), is this really safe, or should I leave more room to avoid the risk of having the bushing's nose ripped out by the bit?
One reason this is a bit more difficult than it ought to be is that this box (to be a kitchen radio with stereo tweeters and a single bass) is already glued together, and I decided at the last moment to change to slightly larger wideband speakers. Those wideband speakers have a very inconveniently shaped basket, and my 5-cut 3-diameter hole setup is already the easy way out.
I've had my new MRC23/MRP23/MRF23 router for 3 months now and somehow haven't gotten around to any of the things that would require its use.
At the same time, I got the Milescraft Turnlock template guide bushing base, and hadn't attempted to mount it yet.
Now I've suddenly got a need to make several round holes for loudspeaker chassis, and due to needing several close but different diameters on the same hole (and already having roughly cut smaller holes (for different speakers) which I now need to enlarge to fit bigger speakers), and not having built a circle jig yet, I thought I'd make one circle template and use different guide bushing (and cutter) diameters to achieve the various slightly different diameters.
(I also figured I might be able to use one of the many mounting holes in the Milescraft base for use as a circle guide pin. This is quite small stuff, with diameters from 71 to 93 mm, so no way to use the circle pin sucker that comes with the Bosch edge guide).
So I went and calculated the different guide bushing offsets from my max diameter downward. Then I looked at the guide bushings that come with the base and found that their sizes do not range all that far...
but I found that the rabbeting cutter in my bit set will substitute for the single larger diameter, while all the other diameters are close enough to 1/8" apart, so that will work.
So I go to install the Milescraft base, and none of the holes seem to obviously match the Bosch bolt locations, though some of the slots might.
I unbolted the Bosch base, to find that the bolts are very short and none of the bolts included with the base are M4.
As a last resort, I look at the included short story about the man named Manual, which does not list this router. "Go to the website to see the latest application guide", which is the same and doesn't list it either.
Now 3 slots, assuming they allow centered placement, may not make for very solid mounting, and I know I'll end up scratching the base (which is still utterly returnable at this point) if I try. Has anybody used this base on this router, with existing holes or by drilling new ones?
Last edited by achoox4; 04-08-2013 at 04:16 PM.