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Seeking tip for plunge routing

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Forum topic by Echofive posted 541 days ago 773 views 0 times favorited 5 replies Add to Favorites Watch
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Echofive

90 posts in 1886 days


541 days ago

I bought a 2 1/4” cove bit, designed for making crown moulding. It is serving my purpose. I want to make a simple plunge cut with my router. I have done a couple of prototypes, and I’ll add a picture to help.
 photo IMAG0630.jpg

I’m getting tear out. Nothing drastic, but enough to tarnish the potential elegance of the project. I’m making several bumps downward and taking small shavings instead of just slamming the router down and trying to make the cut all at once. Due to the diameter of the bit, I’m keeping the speed under 20,000 rpm’s.

I’m just looking for some tips on how to avoid the tearout in maple. Wetting the grain? water? linseed oil? any help is appreciated.

-- Chip, Massachusetts


5 replies so far

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Howie

2656 posts in 1557 days


#1 posted 541 days ago

Maple is tough. Other than slowing the bit down to about 12k and making very very light plunges that’s about all I can add. I don’t think wetting or oil will help(I could be wrong)

-- Life is good.

View William's profile

William

8977 posts in 1477 days


#2 posted 541 days ago

I’ve never been able to NOT get tearout like you describe in the harder woods.
Can it be hand sanded to get rid of the tearout?

Other than that, here is the one solution that worked best for me.
It isn’t perfect, but it works better than using nothing at all.
Clamp a piece of quarter inch thick hard wood over where you’re making the plunge cut.
Use whatever type clamp you need to assure it is clamped down as tight as possible.
Now make your plunge cut through this waste piece and into your work piece.

-- http://wddsrfinewoodworks.blogspot.com/

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Cosmicsniper

2199 posts in 1793 days


#3 posted 541 days ago

You might try some mineral oil…or changing your name. ;)

-- jay, www.allaboutastro.com

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Howie

2656 posts in 1557 days


#4 posted 541 days ago

Jay, have you been sniffing the mineral spirits again? (G)

-- Life is good.

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Echofive

90 posts in 1886 days


#5 posted 541 days ago

It seems the mineral oil might help by “softening” the wood fibers. The piece in the picture above didn’t have tear out, but the 6 additional pieces are getting small tear out, like it’s ripping out blocks of fiber. A few of them I can be sanding out, but I don’t want to do any drastic sanding. This is a beautiful piece of tiger maple and its a shame to ruin it. I appreciate everyone’s comments.

Oh, BTW, Sniper… my name is 50/50. It goes against me in my wood working, but my real job is in semiconductors making computer chips. Good tip, though. ;)

-- Chip, Massachusetts

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