Little confused on circular saw blade sizes? - Woodworking Talk - Woodworkers Forum
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post #1 of 15 Old 07-12-2020, 05:53 PM Thread Starter
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Question Little confused on circular saw blade sizes?

I need a metal cutting circular saw blade for my DeWalt 18v XRP circular saw. I found a 7Ē metal cutting blade stored away in my shop, but itís too big. Then I found a 4 ĹĒ blade but the arbor hole was too big probably for a grinder. I used to think all circular saws used the same blades or at least I've never run into this problem before.

Iím not going to use it much and only to cut Gal Metal roofing so I donít really want to spend a lot of money. Iíd be amazed if I make more than 20 cuts so I want it cheap.

Anyone have any recommendations for a metal cutting blade for a DeWalt XRP circular saw?

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post #2 of 15 Old 07-12-2020, 06:39 PM
where's my table saw?
 
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Your saw's abor is critical ....

Without know the size of your saw's arbor, it's difficult to recommend a saw blade. The 18 V XRP is the type of battery.
https://www.dewalt.com/products/powe...saw-kit/dc390k


Here's what I found for a standard 7 1/4" corded circular saw:
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Last edited by woodnthings; 07-12-2020 at 06:42 PM.
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post #3 of 15 Old 07-12-2020, 07:08 PM Thread Starter
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Quote:
Originally Posted by woodnthings View Post
Without know the size of your saw's arbor, it's difficult to recommend a saw blade. The 18 V XRP is the type of battery.
https://www.dewalt.com/products/powe...saw-kit/dc390k


Here's what I found for a standard 7 1/4" corded circular saw:
YouTube
It says XRP right on the saw itself so I assumed that was the type of saw. Anyway it looks like saw blade size is 6 ĹĒ maximum and Iím not sure what the arbor is, but it looks like the same as my worm drive saw.

Below is very similar to what I got, but newer model.


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post #4 of 15 Old 07-12-2020, 07:33 PM
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https://www.dewalt.com/products/acce...-arbor/dwa7762


DWA7762 Ferrous Metal Cutting
arbor 5/8 in
dia 6-1/2 in
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post #5 of 15 Old 07-12-2020, 07:45 PM Thread Starter
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Quote:
Originally Posted by TomCT2 View Post
https://www.dewalt.com/products/acce...-arbor/dwa7762


DWA7762 Ferrous Metal Cutting
arbor 5/8 in
dia 6-1/2 in
Thanks, but it says "NO PRODUCTS FOUND" when I check the boxes so I guess i need an off brand blade.

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post #6 of 15 Old 07-13-2020, 06:27 AM
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Originally Posted by Sleeper View Post
Thanks, but it says "NO PRODUCTS FOUND" when I check the boxes so I guess i need an off brand blade.

Unless you're boycotting Amazon they have that DeWalt blade along with four other brands at about half the price.
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post #7 of 15 Old 07-13-2020, 08:52 AM Thread Starter
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Quote:
Originally Posted by HoytC View Post
Unless you're boycotting Amazon they have that DeWalt blade along with four other brands at about half the price.
Thanks, I just saw one for $10 at Amazon that I believe will work.

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post #8 of 15 Old 07-13-2020, 09:11 AM
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I think galvanized roofing would be ferrous. That's a 4" diameter blade, cutting aluminum. I suppose there's a chance it would fit on the saw, but I'd find a 6-1/2" blade that cuts ferrous metals.
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post #9 of 15 Old 07-13-2020, 09:33 AM
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I’ve cut metal roofing with a used blade turned backwards.

Cut from flat (back) side, lightly dress with file, be sure to paint edges.

Yes, guys it works!
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post #10 of 15 Old 07-13-2020, 09:44 AM
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Quote:
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Thanks, I just saw one for $10 at Amazon that I believe will work.

No, try this one:


Little confused on circular saw blade sizes?-ba-blade.jpg
Or this:


Little confused on circular saw blade sizes?-freud-blade.jpg
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post #11 of 15 Old 07-13-2020, 12:58 PM Thread Starter
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Quote:
Originally Posted by Dave Mills View Post
I think galvanized roofing would be ferrous. That's a 4" diameter blade, cutting aluminum. I suppose there's a chance it would fit on the saw, but I'd find a 6-1/2" blade that cuts ferrous metals.
Thanks, I was have trouble finding a 6 1/2" blade for some reason and then just now found one.

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post #12 of 15 Old 07-13-2020, 01:04 PM Thread Starter
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Quote:
Originally Posted by DrRobert View Post
Iíve cut metal roofing with a used blade turned backwards.

Cut from flat (back) side, lightly dress with file, be sure to paint edges.

Yes, guys it works!

I originally was thinking of that but all my blade are 7 1/4 and they didn't fit this cordless saw. I wanted to use the cordless because its for a shed far from any power and I wanted to make the cuts on site so I wouldn't cut wrong.

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post #13 of 15 Old 07-13-2020, 01:20 PM
where's my table saw?
 
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Was it actually "cutting"?

Quote:
Originally Posted by DrRobert View Post
Iíve cut metal roofing with a used blade turned backwards.

Cut from flat (back) side, lightly dress with file, be sure to paint edges.

Yes, guys it works!

It may have made a kerf from friction since the teeth were not actually "cutting" as if they were facing in the proper direction. Abrasive wheels work by abrading away the material rather than cutting it away. I use a cut off wheel a lot in my angle grinders:
https://www.amazon.com/DEWALT-DW8426.../dp/B005B8LU2I
It's not the same as a grinding wheel, it's much thinner, about 1/16" thick.

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)
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post #14 of 15 Old 07-13-2020, 03:19 PM Thread Starter
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I built a prefab metal building 45 years ago that was 125' x 30' and when I laid out the foundation I was about Ĺ in out of square. I was running out of time because the concrete truck was already on its way and I didnít think it would mater that much because of the size so I left it.
The walls and girders all bolted up fine, but when I got to the roof the steel panels were looking more like a saw tooth. The property manager said I should just cut it straight afterward with a reverse saw blade and it worked like a charm. Nobody knew except me and the manager.

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post #15 of 15 Old 07-14-2020, 02:39 AM
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I also turn the blade backwards when cutting sheet metal. I use blades that have at least 40 TPI in my 8-1/4" Skilsaw.
Wear eye and hearing protection.
mike
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