M Power's CRB7. - Router Forums
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post #1 of 13 (permalink) Old 03-12-2017, 02:34 PM Thread Starter
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Default M Power's CRB7.

In routing small circles it says drill a 1/4" or 6mm hole. I have several 1/4" bits and done of them are the same even the good Lee Valley bits. The Lee Valley lipped brad point bits come the closets to working for what I need. The shim that M Power furnishes is way less than any 1/4" hole that I can make. I have been trying to figure how to make a bigger shim but nothing has worked so far. I thought maybe you guys might have a fix. I have six holes already drilled that it won't fit so I really need to figure out something.

Don in Murfreesboro,Tn.

Measure once cut twice and it's still to short.
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post #2 of 13 (permalink) Old 03-12-2017, 03:11 PM
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Disclaimer: I don't have one but I looked up the manual for you. By shim, I presume you mean the pivot pin. and when you say it is "way less than any.... 1/4" hole..." how much less. They suggest a 1/4" or 6mm hole for the pivot. Have you tried a 6mm bit - 6mm is slightly less than 1/4". Failing that, you must have other bits at your disposal, smaller than 1/4"???
Now, if you've tried all of the above, and are actually trying to make another pivot pin, I can't help with that.

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post #3 of 13 (permalink) Old 03-12-2017, 03:19 PM
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Don
I think your worry about something that is not problem just drill a 1/4" hole cut the circles, make a test circle I think you will find no problem with circle, if was to tight you have trouble spin it around
Also I lost my pin just used a small screw, I drill small hole into the project and screwed the crb7 plate down no problem

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post #4 of 13 (permalink) Old 03-12-2017, 03:36 PM Thread Starter
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I don't have a 6MM bit. I wish they would go one way or the other with measurements. MM or inches I don't care just so long as it's inches. I might try a test circle but I will get a 6mm bit. Recon they are all different sizes?

Don in Murfreesboro,Tn.

Measure once cut twice and it's still to short.
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post #5 of 13 (permalink) Old 03-12-2017, 04:17 PM
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Don,

I'm not in my shop, so I can't measure my CRB7 pin. What is the diameter difference between the pin diameter and a 1/4" drilled hole? .020" maybe? That means that the pin will fit in the hole very loosely, but gravity should hold the CRB7 in place. When you cut the circle with the router, and the slop between the center hole and CRB7 pin can cause the router to be off position by 1/2 of the diameter error between the pin and the hole, or .010". Are you really trying to cut a circle that accurately with your CRB7 and router?

I guess I should get back to my shop and take these measurments myself to understand your problem, but to me, you are worrying about a problem when one doesn't really exist, at least not in woodworking accuracys.

Charley
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post #6 of 13 (permalink) Old 03-12-2017, 04:28 PM
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Don
Crb7 made in the U.K. That the reason for 6mm
What Charley said ,what I meant, do not think you will even notice in finish project

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post #7 of 13 (permalink) Old 03-12-2017, 04:50 PM Thread Starter
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I agree that puts it in a different light. .01 isn't much. It just looked a lot more than it really is.

Thanks

Don in Murfreesboro,Tn.

Measure once cut twice and it's still to short.
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post #8 of 13 (permalink) Old 03-12-2017, 08:36 PM
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I just measured my pin and it's 5.94 mm. I used it the first time for two holes a couple days ago, 8 1/4" and 3" radii. A 1/4" hole worked great (but next time I'll probably notice the slop). I did happen to use a Lee Valley brad bit, but I can't imagine that's the key, unless your other bits are dull or bent.

Rob
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post #9 of 13 (permalink) Old 03-12-2017, 09:15 PM
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I have always used a 1/4" bit to drill the pilot hole for the CRB7 pivot and had no problems.
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post #10 of 13 (permalink) Old 03-13-2017, 01:30 AM
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Like others have said, I'm not sure that it matters but if all the pins are the size that Rob measured then a 15/64 drill bit would be very close to the right size.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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