All Replies on PC 890 router - unexpected increase in depth of cut

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View trsnider's profile

PC 890 router - unexpected increase in depth of cut

by trsnider
posted 12-02-2018 03:08 AM

6 replies so far

View wichman3's profile


97 posts in 1422 days

#1 posted 12-02-2018 03:23 AM

Based on your observations and the symptoms, I would say that the collet is worn out and is not clamping the bit properly anymore. Replace the collet.
I had this happen to a Dremel I was using as a router and replacing the collet fixed it.

View Hammerthumb's profile


3055 posts in 2776 days

#2 posted 12-02-2018 03:29 AM

I agree with the above comment.
Also, make sure the bit is not bottomed out in the collet prior to tightening. This could also have the results of a climbing bit.

-- Paul, Duvall, WA

View TheFridge's profile


10859 posts in 2287 days

#3 posted 12-02-2018 03:37 AM

Ditto. An upcut spiral bit probably doesn’t help if that’s what you have.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View JAAune's profile


1881 posts in 3118 days

#4 posted 12-02-2018 04:07 AM

It could be a dirty collet too. They should be kept clean. Scrubbing the inside with a brass or bronze tube brush and bit cleaner solution works well.

-- See my work at and

View trsnider's profile


213 posts in 2811 days

#5 posted 12-02-2018 09:18 PM

Ok 2nd collet slipped also, not as much, but still slipped. Guess I’ll go to the store tomorrow and buy a new one. Shucks, I hate going to the store. :( or not so much. :)

View BurlyBob's profile


7689 posts in 3067 days

#6 posted 12-03-2018 01:05 AM

Another thought. Perhaps if you might consider roughing up the shaft of the router bit to improve the collet’s hold on the bit. I had a similar problem with a dovetail bit in my 890 router. If you can find some one with a sandblasting cabinet to shoot the shaft, that might be enough solve your problem.

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