Craftsman 320.27683 does this look right? - Router Forums
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post #1 of 13 (permalink) Old 01-22-2018, 05:55 PM Thread Starter
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Default Craftsman 320.27683 does this look right?

This is my Craftsman 320.27683. I noticed it was making strange noises the other day (almost like a bearing was going out, the noise stopped after running full speed for a few seconds) while routing some grooves in hard maple, and when I went to change the collet and bit, I noticed the spindle was blue like it got hot, but the whole thing was cool to the touch. This certainly doesn't seem normal to me, but I never noticed it before. Any ideas?

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post #2 of 13 (permalink) Old 01-22-2018, 06:29 PM
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I’d say bearing got hot enough to scorch the shaft!
the bit was cutting the wood I presume



guess i forgot to proof read!

Last edited by Semipro; 01-22-2018 at 11:43 PM. Reason: proof read
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post #3 of 13 (permalink) Old 01-22-2018, 09:42 PM Thread Starter
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It was cutting the wood. Have you replaced this bearing before? Is it easy to do?
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post #4 of 13 (permalink) Old 01-22-2018, 10:18 PM
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It could have made a shrieking noise if the bit was spinning in the collet too. If that it was it it might have seized up enough to quit slipping when it got hot. No doubt either way is that something got hot.

The forcing cone in the armature looks quite dirty and needs cleaning. BTW, if the armature bearing is bad you should be able to spin the shaft by hand and feel tightness if it's dry or a bump if there is a chip out of one of the balls.
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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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post #5 of 13 (permalink) Old 01-22-2018, 10:59 PM Thread Starter
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I just tore it apart and confirmed the lower bearing is shot. It's very rough and had a ton of play in it. I couldn't figure out how to get it off the shaft though, even with the "router nut" removed. I assume it's pressed on somehow. There's a bearing shop like a mile from my house, I may have them make an attempt at it.

The bit was definitely NOT spinning in the collet. No evidence of spinning on the bit at all.
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post #6 of 13 (permalink) Old 01-23-2018, 02:16 AM
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It is pressed on as a rule. You can get it off by striping the router down to the armature and putting it in a vise with 2 steel bars supporting the bearing. Screw the nut back on and lay a board on the nut and tap the board with a hammer. You need a second person there to catch the armature when it breaks free. If you aren't comfortable with that then follow your own advise.
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post #7 of 13 (permalink) Old 01-23-2018, 10:38 AM Thread Starter
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Thank you! I'm most likely going to replace both bearings right away since I have it all torn apart.

Let's be real though, dead bearings after only 2 years of light use? I may end up selling this and buying something better. I don't know what yet, but probably a name brand.
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post #8 of 13 (permalink) Old 01-23-2018, 10:45 AM
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Won't hurt to change both as bearings are pretty cheap. The lower one is usually the one that fails first due to the side forces exerted by the bit.

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post #9 of 13 (permalink) Old 01-23-2018, 11:31 AM
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That failure does seem premature, I've got a Craftsman over thirty years old that has original bearings.

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post #10 of 13 (permalink) Old 01-23-2018, 12:22 PM
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I remember hearing years ago that Sears had their routers engineered to last 7 hrs. Their studies showed that the average DIYer only used their router 5 hrs in a year so they made it last 7 and gave it a 1 yr warranty. I've had to replace bearings in a couple of Porter Cable sanders and they also use cheap bearings wirthj under $1 each in bulk for one of the sanders.

No tool company makes their own bearings. I've heard there are only a few bearing makers in the world so bearings are generic and not specific as a rule. You can get a replacement that is rated for a much higher rpm than that one is and it should last for years. For that bearing to fail like it did I suspect that it was only rated for a few thousand rpm, not 25,000.

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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