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Alternate use for Dado Outside blade

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Forum topic by dalec posted 10-22-2010 06:11 PM 1046 views 0 times favorited 6 replies Add to Favorites Watch
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dalec

613 posts in 3355 days


10-22-2010 06:11 PM

Topic tags/keywords: question

I am looking at cutting a few slots for some spline joinery. I am not quite ready to buy a rip saw blade to get a flat bottom cut. Can I use a single outside dado blade to cut a flat bottom groove and is it safe to do so.

Thanks,

Dalec


6 replies so far

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Scott Bryan

27251 posts in 3288 days


#1 posted 10-22-2010 06:24 PM

This should not be any problem. Basically you will be just cutting a 1/8” dado. I have done this to cut miter keys for boxes.

-- Challenges are what make life interesting; overcoming them is what makes life meaningful- Joshua Marine

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knotscott

7223 posts in 2842 days


#2 posted 10-22-2010 06:33 PM

Charles McCracken from Freud has recommended against this method. Most dado sets have an offset side clearance that are intended to work using both cutters as a pair, with a specific right/left designation. The inside edge has little to no side clearance, which means the wood could bind badly and kick back at you. It likely depends on your particular dado set, but I’d take a good look at the overhang on your outside cutters to be sure before proceeding.

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

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dalec

613 posts in 3355 days


#3 posted 10-22-2010 06:36 PM

Thanks Scott.

Appreciate the quick response. Nothing like finding a no cost alternative.

Dalec

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dalec

613 posts in 3355 days


#4 posted 10-22-2010 06:40 PM

Maybe not so safe after all.

I have been thinking about taking the plunge and getting a rip blade that will cut flat bottom grooves for spline that I can use to do some ripping also. Do you have any recomendations on a rip blade?

Dalec

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knotscott

7223 posts in 2842 days


#5 posted 10-22-2010 08:33 PM

For splines I assume you’ll want a 1/8” kerf? If so, several of the 20T to 24T flat top grind (FTG) rip blades will do nicely…Infinity 010-050, Amana RB1020, Freud LM72, older DeWalt DW7642/DW7124, CMT 201.024.10. Holbren’s got the CMT for ~ $37 shipped if you use “woodnet10” or “SMC10” discount code.

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

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dalec

613 posts in 3355 days


#6 posted 10-22-2010 09:05 PM

Knotscott,

I checked my dado outside blade and found the side clearance pretty much does not exist, so I am definitely in the market for a FTG rip blade. Thanks for the blade recommendations.

Lumberjocks is a terrific place learn and to get answers to specific woodworking questions!

Dalec

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