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Using round-over bits

13432 Views 14 Replies 8 Participants Last post by  Dorisz11
Hi folks--

Have a question for the site. I'm building a deck, and wish to use a round-over bit to trim the outer edge of the fascia board for the edge of the deck. I've purchased a set of Skil roundover bits (1/4, 3/8, & 1/2 inch, with axial bearings). I'm going to wind up with approx. 100 ft of fascia, and would like the final edge to be the 1/2" round.

I was taught that routing is done a bit at a time--I do a lot of dovetail work and Japanese notch construction--but I've never used a roundover bit.

My tendency is--as I'll be using a hand router--to use the 1/4" bit, then the 3/8" bit, and finish with the 1/2" bit.

Thus, the question: Is this the way to approach the problem? Would multiple passes introduce inconsistency in the work, or would it be better to just use a single bit (the 1/2") slowly and carefully? (This is treated lumber.) Either way, I'm going to look like a cinnamon donut when I'm finished.

Any suggestions would be appreciated! Thanks!

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Re: round-over bits

Hi Steve

I would suggest one bit and make a pass or two,the treated lumber likes to split out easy so I would suggest using the pocket type way, that's to say go into the stock every 6" or so to stop the splits, than go over the pocket to clean it up..on the 1st pass , the 2nd pass will give you a nice clean job..I will say don't go to slow or you will get burn marks...let the bit do it's job like it was made to do...:)


Bingo--great idea about the pockets. I was concerned about the splitting. Starting high and dropping the same bit--the normal approach to routing--didn't occur to me with three brand new bits.

Thank you, sir!

John--Bit Cleaner?

HI Steve - Welcome to the forum:)
Looks like the guys have you fixed up. Just one tip, especially with treated lumber, have some bit cleaner on hand for when you are finished. Your bits will love you for it:D
John-- what type of bit cleaner? I've never used a two part--three, if you include the axial bearing and the allen (hex) nut--router bit before. Are we thinking a nice WD-40 bath (and not a shower?). I have no idea about the care of multiple part bits!

Hi guys--

Using all of your suggestions, the roundover bit on the treated lumber worked very well.

I did make multiple passes with the same bit, and saw no splitting of the treated lumber.

As the bit-set I purchased came with an allen wrench, I removed the axial bearing, cleaned it out, and just cleaned everything with a WD-40 soaked rag. All dried, re-assembled, and ready to rout another day!

Thanks all so much!

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