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Need a blade recommendation for finger joints - 1/8"

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Forum topic by JustJoe posted 384 days ago 530 views 0 times favorited 6 replies Add to Favorites Watch
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JustJoe

1554 posts in 538 days


384 days ago

I want to make some boxes with small finger joints – the thickness of a regular sawblade, not 1/4” or fatter so the dado set is out of the question. Looking at all my blades it seems that none of them leave a perfectly flat bottom. I guess some of it is due to the set of the teeth but the amount seems to vary greatly blade to blade. My think-kerf blades are very pronounced – they leave almost a V-shaped bottom. I’ve got an older 1/8” rip blade that I can just make out the name Freud on – it is close but still leaves a bit of a V.

So are there any regular blades out there that leave a flat bottom? I’ve got a Sears, Lowes, Home Depot fairly close, or could drive an hour+ to the woodcraft or Horror Freight. Doesn’t have to be an expensive blade – I’ve got ways of dealing with tear-out and the cuts themselves will only be about 3/16” deep. All I need is a flat-bottomed kerf.

thanks
Joe

EDIT: If no such beast exists, does anyone have that HF saw blade sharpener and can it be used to flatten the top profile of the teeth?

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6 replies so far

View TheDane's profile

TheDane

3423 posts in 2163 days


#1 posted 384 days ago

Joe … Freud makes flat-top rip blades in both thin and regular kerf. I have one (packed away somewhere in storage) that I used to make finer joints … did a great job.

-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"

View knotscott's profile

knotscott

5143 posts in 1875 days


#2 posted 384 days ago

Gerry’s got it. You need a blade with a flat top grind (FTG)....no other grind will leave a truly flat bottom. Those are mainly found on dedicated 18T to 24T rip blades. There are 1/8” full kerf and 3/32” thin kerf versions available. Freud, CMT, Infinity, Delta Industrial, Amana, Ridge Carbide, and others have them available.

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

View pintodeluxe's profile

pintodeluxe

3025 posts in 1313 days


#3 posted 384 days ago

Freud 50 tooth combo blade is what I use for finger joints. Full kerf with every 3rd tooth flat ground.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

View AlbertaJim's profile

AlbertaJim

47 posts in 929 days


#4 posted 384 days ago

I have not measured them but also the outside cutters on a dado set have flat tops & I think are 1/8”.

-- My Boss was a carpenter

View JustJoe's profile

JustJoe

1554 posts in 538 days


#5 posted 384 days ago

Thanks for all the quick responses. Knowing what term to search for made it a bit easier. I went through the Freud site and found four 10” ripping blades with a FTG. Amana had another three. I’ll take the list into town tomorrow and see if any of the box stores have them. If they don’t, I’ll look up in Tucson when I go up next Monday.
CMT only had them in the 8 and 12” sizes. I looked at the Infinity and the were a bit pricey. Since at least one of the stores sells Delta tools, I’ll see if I can find a chart of their blades just in case.

thanks again – you saved me a lot of googling.
Joe

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View gfadvm's profile

gfadvm

9540 posts in 1190 days


#6 posted 384 days ago

Just another option: router table with 1/8” spiral bit.

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

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