PC 890 router - unexpected increase in depth of cut

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Forum topic by trsnider posted 12-02-2018 03:08 AM 922 views 0 times favorited 6 replies Add to Favorites Watch
View trsnider's profile


168 posts in 2612 days

12-02-2018 03:08 AM

Topic tags/keywords: porter cable router 890 depth of cut problem router

I have a Porter Cable 890 router in an 8901 router base mounted (upside down) in a router table. While cutting dados for drawer fronts this afternoon I noticed that the depth of cut increased so much (more than 3/16”) that the bit was almost coming completely through the drawer side. I thought that the bit was loose and had worked up while cutting but that wasn’t the case. The bit was still firmly seated in the collett. I then thought the clamping lever was loose however it was as tight as it could go while being able to completely close.

Now I’m at a lose as to what caused the depth of cut to increase so much without an obvious cause. Any ideas?

Is there a reasonably priced router better suited for mounting in a router table than the PC 890? I’m getting pretty fed up with this one.

6 replies so far

View wichman3's profile


96 posts in 1223 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


2989 posts in 2577 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 2088 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


1872 posts in 2919 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


168 posts in 2612 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


6889 posts in 2867 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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