3-wing bit tongue-groove balance issues - Router Forums
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post #1 of 23 (permalink) Old 01-28-2012, 06:45 PM Thread Starter
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Default 3-wing bit tongue-groove balance issues

Hello,

I am new to work working generally. I have a single speed Ryobi 1/4 shank router that I have mounted in a table I built. Because it's 1/4'', I had to go with a 3-wing bit to make tongue and groove boards. I am having some balance issues.

The trouble began when the tongue for the groove was ever-so-slightly too narrow. Being a dumb guy, I thought that I may remedy this problem by messing with the washers placed between the blades and bearing. Well, now the balance of the bit is off and I can't seem to fix it. What is the best way to remedy this problem while hopefully also enlarging the tongue just enough to make the fit snug? Using the bit with one blade instead of two does not throw the bit off balance.

I'd paste the URL of the bit I am running but I can't do that until I have made ten posts. If one goes to amazon and types in "BOSCH 84623M 1/4-Inch Shank Tongue & Groove Router Bit 3-Wing With Bearing", this is the bit I am running.

Thanks,
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post #2 of 23 (permalink) Old 01-28-2012, 11:24 PM
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From the looks of things it seems the blades need to be lined up, are you using the original shims and bearings that came with the bit? Honestly I would think it wouldn't matter if the two blades didn't line up, but evidently something is different. This bit IS designed to be used as a single and double cutter, right? Same bit to make the tongue and the groove?

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post #3 of 23 (permalink) Old 01-29-2012, 01:26 AM
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Hi Philip,

You said "I thought that I may remedy this problem by messing with the washers placed between the blades and bearing".

I have a question for you.

What do you mean by messing with the washers?

Mike

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post #4 of 23 (permalink) Old 01-29-2012, 01:51 AM
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Hi Philip,

If you did not bend, file, sand or other wise deform the washers then I would take everything apart and clean everything, making sure you don't have something between the washers, bearing, or bblade. If there was anything that kept the top blade from seating properly it could cause it to wobble like an adjustable dado blade and cause vibration.

Make sure you are have enough shank in the collect and the bit is not bottomed out in the collect.

Mike

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post #5 of 23 (permalink) Old 01-29-2012, 12:48 PM Thread Starter
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Thanks for the feedback.

Jack: The bit is designed to cut the tongue and groove. The blades were not lined up perfectly when I first used the tongue function, with no wobble then. I have all of the same washers/spacers that came with the bit, although there are about five I think (some of terribly thin thickness) and I have lost track of the original order.

By messing with the washers I mean this: there are about five washers of varying thicknesses. I don't have a micrometer but I would venture a guess that they range from 1/64 to 1/128 of an inch thick. There was also a fatter washer that I think was originally between the final blade and the nut that held the assembly together. To make the tongue a bit ticker to fit more tightly into the groove, I removed the tiny washers and placed in the larger washer. I believe the wobble began at this point. I immediately shut off the router and placed the little washers back between the blades and the bearing (the bearing is original, also) to find that the bit was now wobbling with the tiny washers also. I didn't alter any of the washers in any way.

Thanks for the help,

Mike: now that I think of it, the blade may be bottomed in the collet. The next time I'm in the shop I will back it out a sixteenth and give it a try.
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post #6 of 23 (permalink) Old 01-29-2012, 01:55 PM
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Hi phillip

The washer are made just for that type of job,they can be bent a little bit and the cutter will flat them out, make sure the nut on the top is on right and you have a washer under it..(thicker washer than the shims)

That bit is a normal 3W T & G bit set..if you get a wobble take it down to parts and start over from sq. one, a good way to set it is by using brass bars (Key stock ) they are dead on the norm..you can also use a good drill bit but with care..and a playing card to over set it by a little bit..

Hope this helps

Amazon.com: BOSCH 84623M 1/4-Inch Shank Tongue & Groove Router Bit 3-Wing With Bearing: Home Improvement




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Last edited by bobj3; 01-29-2012 at 01:59 PM.
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post #7 of 23 (permalink) Old 01-29-2012, 02:37 PM Thread Starter
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Do you mean to use a playing card as an additional shim? I will keep the larger washer out of the mix, will the order of the smaller shim washers matter? for example: blade - 2 washers - bearing - three washers - blade? The bit came with five washers.

Thanks,
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post #8 of 23 (permalink) Old 01-29-2012, 03:03 PM
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HI Phillip

The playing card is just use as a gauge place it on top the cutter put the shims in place then move it around a little bit it should come out free of the cutter and side back in the same way once you have that done put the wrench to it and check it one more time..

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Originally Posted by wingman View Post
Do you mean to use a playing card as an additional shim? I will keep the larger washer out of the mix, will the order of the smaller shim washers matter? for example: blade - 2 washers - bearing - three washers - blade? The bit came with five washers.

Thanks,



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post #9 of 23 (permalink) Old 01-29-2012, 03:53 PM Thread Starter
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I'm not sure what I'm supposed to be gauging. Distance between blades?
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post #10 of 23 (permalink) Old 01-29-2012, 06:29 PM
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Right on


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Originally Posted by wingman View Post
I'm not sure what I'm supposed to be gauging. Distance between blades?



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