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Forum topic by gmussell posted 02-12-2014 03:01 AM 1000 views 0 times favorited 12 replies Add to Favorites Watch
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gmussell

17 posts in 1812 days


02-12-2014 03:01 AM

I am going to get a radial arm saw for my shop. I was wondering about the length of the cross cut. Can they all cut the same width board? Can a 12” cut more than a 10”?

Thanks
George


12 replies so far

View BilltheDiver's profile

BilltheDiver

250 posts in 2351 days


#1 posted 02-12-2014 11:12 AM

Yes, but the 12 will also cut a thicker board. I have a 10” I received in the late 70’s and still do 99% cf my crosscuts with it. Get good instructions on how to set it up and spend the time to do it.

-- "Measure twice, cut once, count fingers"

View Fred Hargis's profile

Fred Hargis

3947 posts in 1959 days


#2 posted 02-12-2014 12:20 PM

There are (once in a while) a few Dewalts show up called “long arm” saws, and they have a much larger cross cut capacity.

-- Our village hasn't lost it's idiot, he was elected to congress.

View Loren's profile

Loren

8313 posts in 3114 days


#3 posted 02-12-2014 12:42 PM

They vary. If you want to crosscut wide cabinet sides
you’ll need a larger than normal saw, like an old DeWalt 14”
saw. You can put a smaller blade on a big saw and get a
little more capacity that way.

There are also large capacity saws made by Omga and other
makers. You’ll have to look at the used market.

View bigblockyeti's profile

bigblockyeti

3668 posts in 1187 days


#4 posted 02-12-2014 12:57 PM

The travel of the head is what will dictate the width of board you can cut, and they’re not all the same. You should be able to find specs online for any machine, new or old, that you’re considering. In theory the 12” saw with the same travel will have less width capacity due to the fact the fence would have to be 1” closer to you to make up for the blade’s larger radius. I ran into this problem years ago putting the correct 18” blade on an old DeWalt from a 14” blade that we had at the time. While I could now cut through 6”x material, the fence had to be moved 2” closer to the operator due to the increased blade radius. One other thing to think about is what blades are in your shop now? I’ve got over 40 10” blades and zero 12” blades, if I were to pick up a RAS it would make sense for it to be 10”.

View Bill White's profile

Bill White

4456 posts in 3426 days


#5 posted 02-12-2014 03:43 PM

I miss mine. Just didn’t have the room.
Good setup and a good blade is the key.
Bill

-- bill@magraphics.us

View gmussell's profile

gmussell

17 posts in 1812 days


#6 posted 02-12-2014 04:22 PM

Thanks for all the great info. This is one of the ones I was considering:
http://denver.craigslist.org/sys/4304700277.html

There are a bunch of them out there. This one is 12 inch, with a 110/220 motor. Another thing to consider, what about the arbor size? I can’t find any info on it. If it is 1” does that mean that I could not use the 5/8 arbor blades. I am mainly thinking about the holes on my dado blades.

thanks

George

View patron's profile

patron

13538 posts in 2807 days


#7 posted 02-12-2014 04:43 PM

10” blade all have 5/8” holes
12” have 1” ones

when i got an ras
i set it to square
and leave it alone

http://lumberjocks.com/projects/21465

for any angle cuts i use jigs or fences
that register to the table
for dado groves
i made a sled to raise the work
so the back fence doesn’t get messed up

http://lumberjocks.com/patron/blog/11083

nothing worse or more dangerous
than a table and fence
all cut up from moving the arm and leaving the table and fence
trashed
and getting the saw back to a 90* set again

my 10” saw cuts to 15”
for shelves at 16”
i just ‘lift’ the work the last bit

best of luck with your purchase
work safe

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View bigblockyeti's profile

bigblockyeti

3668 posts in 1187 days


#8 posted 02-12-2014 04:51 PM

Just checked online and the DeWalt 7790 is listed as having a 5/8” arbor, so you should be good to go with that saw. If you need a 12” blade with the 5/8” hole, they do exist, just shop around.

View gmussell's profile

gmussell

17 posts in 1812 days


#9 posted 02-12-2014 06:08 PM

10” blade all have 5/8” holes
12” have 1” ones

This is what I was thinking. I have seen post where people talk about using 10” blades one a 12” saw, how is this possible if the arbors are different?

This saw is listed as a 12” saw, yet is has a 5/8 arbor??

thanks

George

View Minorhero's profile

Minorhero

372 posts in 2071 days


#10 posted 02-12-2014 07:06 PM

I own and like the 7790. I use a spacer to take the 1” arbor down to the 5/8 size. They sell spacers exactly for this purpose and they are suitably cheap (like 10$ or less).

Blade travel depends on the saw not the size of the saw if that makes sense.

Either way a RAS is only as good as the table. Just putting down some hardwood or plywood will produce pretty terrible cuts in short order. Search Mr Sawdust Table. There are instructions available to build a reusable and truly fantastic table.

View darthford's profile

darthford

532 posts in 1390 days


#11 posted 02-15-2014 08:04 AM

Here’s my restored 1952 Rockwell/Delta Multiplex 40-B, it takes 12” or 14” blades and she will cross cut 16” of 1-1/16 thick stock with the 12” Forrest Chopmaster blade I have installed now. Table is 24”x48” a sandwich of 3/4 ply with a Sapele hardwood center. I clamped and pressed this table down flat onto my table saw table with lots of weight so its quite flat but if I had to do it over I would have used Russian Birch ply vs the Lowes junk. Still it came out nice I’m happy with it.

Last night was my first attempt at dialing it in and making a test cut. Across a 4 inch board I’m .003 out of square, vertically I’m about .002 out of square so I have a touch of adjustment yet to perform. Dang the thing is a bit intimidating at first that big blade really spins. It cut the Sapele like it wasn’t there.

View Fred Hargis's profile

Fred Hargis

3947 posts in 1959 days


#12 posted 02-15-2014 01:03 PM

That Dewalt is one of the more excellent saws available. You cannot do better. Once tuned, it will cut with laser accuracy, and return to 90º with precision after you swing the arm around. The key is the solid cast iron arm, later models were “value engineered” and much of the precision was lost. Should you buy it, I have a pdf file that would be of use in tuning it, I can e mail it if you want/need.

-- Our village hasn't lost it's idiot, he was elected to congress.

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