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DW621 Router variable speed problem

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Forum topic by 404 - Not Found posted 06-15-2012 01:34 PM 1010 views 0 times favorited 4 replies Add to Favorites Watch
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404 - Not Found

2544 posts in 2434 days


06-15-2012 01:34 PM

There’s a circular magnet on top of the armature of this router that has something to do with how the variable speed works. Long story short, it’s worked itself free, was making a horrible noise and speed selection no longer works.

I’ve whipped out the magnet to stop the grating noise (I need to use that router to finish something off as well), so the question is, is there an adhesive I can use to bond the plastic casing of the magnet onto the tip of the metal shaft of the armature?

The magnet is insulated by the plastic casing it’s held in, so I don’t think conductivity is an issue. It’s just a friction fit, no splines or anything – and the second time this has happened – I bought a replacement magnet to fix it the first time, but that fix has only lasted a few months.

Any suggestions would be appreciated.


4 replies so far

View Tennessee's profile

Tennessee

2410 posts in 1979 days


#1 posted 06-15-2012 01:48 PM

As you well know, the magnet has to be centered so the electron module can pick up the rotations to adjust speed. You can see the plastic casing in the exploded drawing I found online, and I think it does act as somewhat of an insulator from the armature shaft, maybe to keep the shaft from slowly depleting the magnetism of the magnet. I would roughen up the plastic and sand the shaft end, and possibly go with the gel style superglue? It has a better holding capability than normal superglue.
Short of that, a long dry time epoxy might do the trick if it can get a grip on the plastic after it’s sanded. It would seem that it gets hot in there, so the five-minute type epoxy would probably shrink, crack and fail.

I just took another look at the diagram, you can bring up pics, looks like the magnet has a hole in it? Could you tap and thread it on? Just a wild thought.

-- Paul, Tennessee, http://www.tsunamiguitars.com

View Tennessee's profile

Tennessee

2410 posts in 1979 days


#2 posted 06-15-2012 02:20 PM

The plastic base in the picture seems to be nylon. I didn’t think J-B Weld would stick too good to nylon. Maybe I’m wrong.

-- Paul, Tennessee, http://www.tsunamiguitars.com

View Tennessee's profile

Tennessee

2410 posts in 1979 days


#3 posted 06-15-2012 02:30 PM

I guess this is why one guy in a cabinet shop told me one time they strictly stay away from most variable speed models of all brands. Failure rate too high.

-- Paul, Tennessee, http://www.tsunamiguitars.com

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404 - Not Found

2544 posts in 2434 days


#4 posted 06-15-2012 03:20 PM

Thanks for the replies. I will see if I can get JB-Weld in an auto factors next time I’m in town.
Until then, it’s full speed (the only speed) ahead with the router.
I will have to get another magnet anyway as on further inspection, the friction where it worked loose has melted the top casing on to it. Seems like a poor design for this component in such an expensive little router.

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