Stubborn Nut...not me, the tool. - Router Forums
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post #1 of 14 (permalink) Old 10-16-2014, 07:55 AM Thread Starter
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Default Stubborn Nut...not me, the tool.

I have an old 8 1/2 inch Craftsman radial arm saw on which the blade needs changing. Try as I might, I cannot loosen the nut on the arbor. Can someone tell me if this might be reverse threading on the arbor, in which case I have succeeded in tightening this to the point where it is now fused together. Given that there are only two possibilities i.e. clockwise vs. counterclockwise you'd think I could have figured this out on my own...but no. Can anyone help?
Thanks in advance.
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post #2 of 14 (permalink) Old 10-16-2014, 08:10 AM
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My 10" was left handed threads. Might try a little torch applied heat.

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post #3 of 14 (permalink) Old 10-16-2014, 08:22 AM
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The blade usually spins in the direction opposite the thread direction. Looking at the saw from the front: if the nut is on the left, its probably reversed. On the right, it's probably not reversed (like a table saw).

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post #4 of 14 (permalink) Old 10-16-2014, 08:30 AM
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To add to what Phil said they are designed so that if the blade slips it will try to tighten the nut. So imagine the blade slipping and trying to spin the nut with it and then turn the opposite to take it off.

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post #5 of 14 (permalink) Old 10-16-2014, 11:09 AM
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My Craftsman radial arm has left handed threads. Every radial and miter saw I have ever seen has them.
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post #6 of 14 (permalink) Old 10-17-2014, 06:23 AM
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I think saws always have threads reversed so the blade doesn't try to loosen the nut in use as already described. I'd try some penetrating lubricant and let it soak in awhile first. If you use heat after lubricant, use a heat gun--cheap at Harbor Freight, not an open flame. You'll need to lock the blade to start with so it doesn't turn when you work the nut. Could use a wooden clamp for that. Any movement is going to reduce the torque on the nut.
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post #7 of 14 (permalink) Old 10-17-2014, 08:59 AM
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Hi Bob welcome
I don't like to put heat on things like that. My guess is a impact gun will spin it right off. You may have to trigger it a few times to get it done.
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post #8 of 14 (permalink) Old 10-17-2014, 09:18 AM
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+1 - Left-handed.

So do you have the thin wrench that goes on the nut behind the blade?

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post #9 of 14 (permalink) Old 10-17-2014, 09:33 AM
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Quote:
Originally Posted by NH Bob View Post
I have an old 8 1/2 inch Craftsman radial arm saw on which the blade needs changing. Try as I might, I cannot loosen the nut on the arbor. Can someone tell me if this might be reverse threading on the arbor, in which case I have succeeded in tightening this to the point where it is now fused together. Given that there are only two possibilities i.e. clockwise vs. counterclockwise you'd think I could have figured this out on my own...but no. Can anyone help?
Thanks in advance.
hold a regular bolt up to the shaft and look to see if the threading is the same...
see if there is a L or an R on the end of the shaft...

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post #10 of 14 (permalink) Old 10-17-2014, 10:08 AM
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Quote:
Originally Posted by MAFoElffen View Post
+1 - Left-handed.

So do you have the thin wrench that goes on the nut behind the blade?
Yes, thats what I was going to ask, mine (Craftsman too) has two wrenches and is lef-handed thread.

Good luck.
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