Centering bit in bushing - Router Forums
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post #1 of 14 (permalink) Old 04-18-2012, 02:08 PM Thread Starter
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Default Centering bit in bushing

I am trying my hand at floating tenon joinery.

I have a DW621 plunge router which seemed to have a very nice bushing design. The the metal ring that holds the bushing is press fit into the router base. There is no adjustment possible. However, because the metal ring is pressed into a resess in the actual metal base of the router I assumed that it was centered on the shaft.

Unfortunately, the bit is not centered on the bushing and there does not seem to be a way to adjust it.

Am I missing something?

Has any run into this problem?
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post #2 of 14 (permalink) Old 04-18-2012, 04:19 PM
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Quote:
Originally Posted by peb687pmr View Post
I am trying my hand at floating tenon joinery.

I have a DW621 plunge router which seemed to have a very nice bushing design. The the metal ring that holds the bushing is press fit into the router base. There is no adjustment possible. However, because the metal ring is pressed into a resess in the actual metal base of the router I assumed that it was centered on the shaft.

Unfortunately, the bit is not centered on the bushing and there does not seem to be a way to adjust it.

Am I missing something?

Has any run into this problem?
Hi Peter - Welcome to the forum

Picture would be handy as I'm not familiar with that router but it sounds as if the base plate itself needs to be centered. To do this you would install the bushing and centering pin then loosen the screws holding the base plate to the base and move the base plate until it's centered. The issue could be that the mfg elected to use flat head screws with cone shaped countersinks which will pull the plate back out of alignment as they are tightened. The fix here is to bore the screw holes slightly larger and then counterbore the holes and switch to pan head screws. I'm sure there is a more detailed procedure in one of the stickys but that's the general idea.

John Schaben

The problem with experience is I usually get it immediately after I need it.
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post #3 of 14 (permalink) Old 04-18-2012, 06:06 PM Thread Starter
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Default Bit centering

Quote:
Originally Posted by jschaben View Post
Hi Peter - Welcome to the forum

Picture would be handy as I'm not familiar with that router but it sounds as if the base plate itself needs to be centered. To do this you would install the bushing and centering pin then loosen the screws holding the base plate to the base and move the base plate until it's centered. The issue could be that the mfg elected to use flat head screws with cone shaped countersinks which will pull the plate back out of alignment as they are tightened. The fix here is to bore the screw holes slightly larger and then counterbore the holes and switch to pan head screws. I'm sure there is a more detailed procedure in one of the stickys but that's the general idea.
I know what you are saying. On my other routers, the bushing goes in the baseplate, which can be adjusted. On the DW621 the bushing ring press fits into the cast aluminium base of the router, not the phenolic removable base plate.

Initially I thought that this was a good idea because the centering was controlled by the manufacturer. Unfortunately, it is not centered and I cannot see a way to adjust it.

When I get home I will take a picture.
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post #4 of 14 (permalink) Old 04-19-2012, 02:27 PM Thread Starter
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Default Here are some pictures of what I am talking about

As I hope you can see from the pictures, the metal ring that hold the bushing press fits into the housing. As far as I can tell there is no adjustment.
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post #5 of 14 (permalink) Old 04-19-2012, 02:29 PM Thread Starter
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Default Here is another picture

For some reason this picture did not attach.
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post #6 of 14 (permalink) Old 04-19-2012, 02:41 PM
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Hi Peter

Pickup a Milescraft base plate and get right around that error on your DeWalt.

Amazon.com: Milescraft 1201 Base Plate / Bushing Set for Routers: Home Improvement

==




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post #7 of 14 (permalink) Old 04-20-2012, 07:46 AM Thread Starter
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I took a look at the Milescraft baseplate and I had a few thoughts:
1) It seems to be a better fit for bases that are round, the DW621 is more rectangular.
2) I really like the dust collection feature built into the DW621. I am afraid that I would lose that ability with the Milescraft plate.
3) I am already tooled up with bushings and mortise jigs for the DW621 and I am do not want to retool and respend if I don't have to.
4) And finally, I was hoping to hear from some one who has a DW621 that could possibly shed some light on why the shaft is not centered in the machined base of the rougter. Initially I felt that it was a good design because there was no adjusability in the bushing ring. Who better to align the shaft than the manufacturer? So, I can't help wondering if I am missing something.

Anyway thank you for the replies.
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post #8 of 14 (permalink) Old 04-20-2012, 09:11 AM
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Hi Peter

You're Welcome

Below you will see a shot of the 611 DeWalt with a MilesCraft base on it,the round plate and it fits just fine and you will not block you pickup system and the real plus you can use up to a 2" OD bit without removing the base plate or your guide system..

==



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post #9 of 14 (permalink) Old 04-20-2012, 09:13 AM
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Not missing anything. Centricity is guess & x golly with your system.
Sometimes right on, however, and I've inspected many 621's from many countries of origin.
Take the guess work out of it? Then investigate an adjustable plate.
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post #10 of 14 (permalink) Old 04-20-2012, 06:35 PM Thread Starter
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Well, you make a good case. I will take a closer look and the Milescraft system.
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