blackened router bit

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Forum topic by toolie posted 06-02-2013 10:58 PM 1267 views 0 times favorited 7 replies Add to Favorites Watch
View toolie's profile


2094 posts in 2466 days

06-02-2013 10:58 PM

i had to route a slot in a dril press table which was 3/4” plywood topped with 1/4” MDF. this is what the bit looked like after the routing:

when i routed a wider slot in the underside of the 3/4” plywood base with a larger router bit,it didn’t blacken, so i’m guessing it’s somehow related to the MDF. any thoughts and suggestions for cleaning the subject bit?

-- there's a solution to every just have to be willing to find it.

7 replies so far

View JustJoe's profile


1554 posts in 1876 days

#1 posted 06-02-2013 11:02 PM

a few things you can try – maybe slow down the router speed a tad or take multiple passes instead of going full-depth or use a dado-bit instead of a straight bit.

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View gfadvm's profile


14940 posts in 2528 days

#2 posted 06-03-2013 01:32 AM

As far as cleaning that bit, I soak mine overnight in bug and tar remover from the auto parts store (even my bearing bits). Works great. I put about 1” of the remover in a small jar and replenish as needed. I clean all my bits every time I use them and have never changed out my cleaning solution.

You could also soak non-bearing bits in Simple Green like I do my sawblades.

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

View jusfine's profile


2422 posts in 2764 days

#3 posted 06-03-2013 01:38 AM

Did you pre-drill a hole or use that bit to plunge through? I have had the same thing happen when plunging that style of bit.

-- Randy "You are judged as much by the questions you ask as the answers you give..."

View Rick_M's profile


10634 posts in 2218 days

#4 posted 06-03-2013 05:24 PM

I had an old bit worse than that, soaked it in citrus degreaser for about a minute and wiped the black off.


View DS's profile


2824 posts in 2258 days

#5 posted 06-03-2013 09:20 PM

Slow down RPM and/or speed up the feed speed.
In other words, you need a higher chip load to carry off the excess heat.

The larger bit you used on the backside had a higher chip load and didn’t burn.

-- "Hard work is not defined by the difficulty of the task as much as a person's desire to perform it.", DS251

View NiteWalker's profile


2736 posts in 2415 days

#6 posted 06-04-2013 10:20 AM

With MDF you want to take shallow passes, don’t move the router too slow, and have good dust collection. As said, those mdf dust particles heat up and char your bits.

I use rockler’s blade a bit cleaner. Smells like oranges, not harmful to skin really and lasts a long time. I’ve been using the same bottle for 6+years. I use it at full strength and just pour the used cleaner back into the bottle.

-- He who dies with the most tools... dies with the emptiest wallet.

View toolie's profile


2094 posts in 2466 days

#7 posted 06-05-2013 02:33 AM

seems the lack of dust collection on the mdf was probably a significant contributing factor. so that’s item one to address with a good bit cleaner being item 2.

-- there's a solution to every just have to be willing to find it.

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