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Using Circular Saw Blades on a Table Saw

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Forum topic by CharlieM1958 posted 11-23-2009 10:15 PM 16345 views 3 times favorited 38 replies Add to Favorites Watch
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CharlieM1958

15714 posts in 2941 days


11-23-2009 10:15 PM

This may be a dumb question, but….

This review happened to catch my eye, and it got me to thinking (usually not a good thing). Since probably more than 90% of my cuts are on material less than 1” thick, is there any downside to using a 7 1/4” blade in a table saw?

I’m not talking about for everyday general purpose cutting… I have a Forrest WWII that I’m quite happy with. But if I wanted a couple of special purpose blades (plywood, thin kerf, etc.) it would be cheaper to purchase the smaller blades.

I was just wondering if there was a particular reason not to do this, other than the obvious sacrifice in maximum cutting depth.

-- Charlie M. "Woodworking - patience = firewood"


38 replies so far

View degoose's profile

degoose

7049 posts in 2077 days


#1 posted 11-23-2009 10:19 PM

Charlie… dont know for sure but I believe that the motors are set for max rpm for the diameter of the blade and if you reduce the diameter you have a different speed at the tooth… if that make sense.

-- Drink twice... and don't bother to cut... @ lazylarrywoodworks.com.au For lovers of all things timber...

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PurpLev

8476 posts in 2371 days


#2 posted 11-23-2009 10:21 PM

theoretically I would think that the depth of cut is the only factor, however. the larger blades are also heavier which contributes to a more stable cutter, which would result in a cleaner cut – theoretically speaking.

another thing to consider is the rotational speed – I’m not sure of the numbers, but I think that a TS turns faster RPMs than a circ-saw, which might shorten the life of the circ-saw blade if used on a TS. but I really am too lazy to look up the RPMs for the machines right now.

all in all – I think it’s doable, but why not just use a good full size blade – there are some good ones out there that dont break the bank…

-- ㊍ When in doubt - There is no doubt - Go the safer route.

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CharlieM1958

15714 posts in 2941 days


#3 posted 11-23-2009 10:35 PM

Larry, you’re right….obviously the larger the diameter, the faster the tooth speed. I’m not sure how that would translate into cut quality.

Sharon, I hadn’t considered different motor RPM’s.

-- Charlie M. "Woodworking - patience = firewood"

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Alonso

946 posts in 1961 days


#4 posted 11-23-2009 10:49 PM

I’ve been using D0724X/A 24T from Diablo for a long time with no issues at all for some ripping and crosscutting, in fact yesterday I got D0760X/A “Ultrafinish 60T” to cut some venner plywood and I totally love it, like the review says, not much noise, less dust and cleaner cuts. I never thought I should not use a 7 1/4” blade on the TS

-- The things I make may be for others, but how I make them is for me.

View jeffreythree's profile

jeffreythree

38 posts in 1899 days


#5 posted 11-23-2009 10:50 PM

I use a classic Delta Homecraft TS and good 7-1/4” saw blades are a LOT cheaper than good 8”. Thinner kerf too. I keep one 8” around for those times I need the extra cutting depth. I also used it on my previous Delta Shopmaster (all I could afford) and the smaller blade would breeze through what the stock sized 10” had no chance of cutting. Under a certain dollar amount, I think a TS should come with a smaller blade. They just don’t have the power to run a full cut with a 10” blade.

-- My Etsy store: http://jtcwoodcrafts.etsy.com

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Dan'um Style

13179 posts in 2706 days


#6 posted 11-24-2009 01:01 AM

go for it Charlie … I’ve used smaller blades many times and the only downside is depth of cut

-- keeping myself entertained ... Humor and fun lubricate the brain

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webwood

619 posts in 1973 days


#7 posted 11-24-2009 01:17 AM

my dado head is 8”

-- -erik & christy-

View Dick, & Barb Cain's profile

Dick, & Barb Cain

8693 posts in 3022 days


#8 posted 11-24-2009 01:18 AM

I don’t think going smaller should hurt.

I think a smaller thin kerf would be more stable than a large thin kerf.


Dado blades are smaller in diameter, so I don’t see no harm.

-- -** You are never to old to set another goal or to dream a new dream ****************** Dick, & Barb Cain, Hibbing, MN. http://www.woodcarvingillustrated.com/gallery/member.php?uid=3627&protype=1

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teenagewoodworker

2727 posts in 2491 days


#9 posted 11-24-2009 01:25 AM

yep i use small blades all the time. go for it!

View Mark's profile

Mark

1787 posts in 1997 days


#10 posted 11-24-2009 01:46 AM

i don’t personally understand the point in putting a 7 1/4” blade in the table saw. I understand for thinner cuts and cheaper prices but you won’t get the height you want if you’ree cutting a thick piece or a long pitch angle. And those blades get so dull so quickly. I personally have the 10” freud (diablo i think its called [the red blade]) and i don’t regret buying the beauty.

-- My purpose in life: Making sawdust

View David Craig's profile

David Craig

2135 posts in 1832 days


#11 posted 11-24-2009 01:57 AM

Not a stupid question at all Charlie. Before posting my comment to the review, I tried finding any info I could online. I guess my concern was the RPM, the depth of cut, and the stability of the blade. Kind of like routers. If I have a table mounted router, my preference is a 1/2 inch shank because I am pushing the wood into the blade, not the other way around. When you run wood into a cutting surface, the stress is much greater. To me, that is one of considerations taken into account when they design the size and shape of the blades in question. Yes, a dado blade is smaller in size than some circular saw blades, but look at the thickness and the quantity of the cutters. They are substantially weighted. I personally do not see much gain in going with circular saw blade even with a price savings of 10-15 bucks. Wood magazine had quite a list of tablesaw blades with a lot of life and quality for around a thirty dollar purchase. The blade would last longer and the cuts would be more precise, and you wouldn’t be limited to a cutting depth of just over an inch. Just my humble opinion :)

-- There is little that is simple when it comes to making a simple box.

View Alonso's profile

Alonso

946 posts in 1961 days


#12 posted 11-24-2009 01:58 AM

I think is very simple, if you need the thin kerf but height is not a problem go with a small blade, if height is an issue, then go with the standard 10”, I second Mark I do also have the 10” Diablo full kerf, it is a great blade.

-- The things I make may be for others, but how I make them is for me.

View Beginningwoodworker's profile

Beginningwoodworker

13347 posts in 2396 days


#13 posted 11-24-2009 02:04 AM

I have try it, but I rather use a 10’’ blade.

-- CJIII Future cabinetmaker

View Mark's profile

Mark

1787 posts in 1997 days


#14 posted 11-24-2009 02:09 AM

Good choice for a blade alonso :) the diablo is worth the cost

-- My purpose in life: Making sawdust

View knotscott's profile

knotscott

5563 posts in 2098 days


#15 posted 11-24-2009 02:52 AM

Charlie – The teeth on smaller diameter blade make a tighter arc than those of a 10” blade, which translates to the equivalent of a steeper hook angle. It should be fine for ripping, but I suspect it’ll be a mixed bag for ultra fine ply cuts. Most plywood blades have a fairly low hook angle. Smaller blades will work, and may even be easier to spin, but I doubt they’ll cut as cleanly on a critical fine cut. Keeping the height on a smaller diameter blade low should help some, but I don’t think it’s worth passing up a good blade for.

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

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