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Powermatic saw not reverse threaded

3/22/16       
Tony Member

I recently bought an old Powermatic 66 and I put the blade on last night and the nut to secure the blade is NOT reverse threaded........In 30 years of working with 10 inch saws I have never seen one that is not reverse threaded. The motor is on the left and it's a left tilting blade, I'm wondering if that has anything to do with it. Anybody else ever seen this before?

3/22/16       #2: Powermatic saw not reverse threaded ...
Mike Member

When the motor is on the right the left hand thread is necessary to keep the nut from becoming loose when it spins up. Having the motor on the left would need a right hand thread.

3/22/16       #3: Powermatic saw not reverse threaded ...
Leo G Member

If you held the nut and turn on the motor it should tighten. If that's the case then it's the correct handed thread.

3/24/16       #4: Powermatic saw not reverse threaded ...
TonyF

Tony:

In order to secure any mounting to a threaded axle, the nut/axle should be threaded such that the direction to tighten the nut is the reverse/opposite of the direction of axle rotation under power.

If it is not as Mike describes, you could jam nut (double nut) the blade. I have a feeling, however, that it is probably as Mike describes.

TonyF

3/24/16       #5: Powermatic saw not reverse threaded ...
Pat Gilbert

BTW if it is a phase motor it is easy to reverse the direction.

3/24/16       #6: Powermatic saw not reverse threaded ...
Pat Gilbert

Make that 3 phase motor

3/24/16       #7: Powermatic saw not reverse threaded ...
Mitch Suber  Member

Website: subercustomshutters.com

My Powermatic 66 is 22 years old, maybe not the same age as yours. But mine is threaded the same as yours. Motor is to the left and it too has a tilting arbor as well. Blade direction causes the nut to tighten, so basically it is impossible for it to come off.

3/26/16       #8: Powermatic saw not reverse threaded ...
Jimmy

I think if you reverse the motor rotation it's not going to cut very well....

3/26/16       #9: Powermatic saw not reverse threaded ...
Pat Gilbert

You can reverse the motor with no adverse effect.

3/26/16       #10: Powermatic saw not reverse threaded ...
Jimmy

How can reversing the rotation of the motor to reverse the rotation of the arbor not cause the blade to rotate backwards?

3/26/16       #11: Powermatic saw not reverse threaded ...
Pat Gilbert

Just flip the blade.

But there will be no damage to the bearings as they rotate equally well either direction.

3/26/16       #12: Powermatic saw not reverse threaded ...
Jimmy

And then feed from the backside??

3/26/16       #13: Powermatic saw not reverse threaded ...
Mitch Suber  Member

Website: subercustomshutters.com

Pat, I have to agree with Jimmy on what you are describing here, with reversing the rotation. I don't see how reversing rotation or the blade can possibly be done, or are you just messing with us, a little woodshop humor?

3/26/16       #14: Powermatic saw not reverse threaded ...
Pat Gilbert

No joke. If you want to change the direction of a 3 phase motor you simply switch any two wires at the connection and it will change the direction of the motor.

Of course you may have to change the direction of the blade.

3/26/16       #15: Powermatic saw not reverse threaded ...
Mitch Suber  Member

Website: subercustomshutters.com

No, I get the fact that reversing the current flow changes the motor spin. I remember learning that in science, and doing the same thing in the shop once on a shaper. But reversing the spindle rotation, does not change the orientation of the spindle threads. Also, I can't for the life of me, picture how flipping the blade helps anything. If I did that on my saw, reversing the current would mean the spindle would rotate the blade up and away from me when feeding the saw. The blade would raise the material and hurl it against the back wall of my shop, right? And if I then put the blade on backwards, it still rotates the same way, and would still pick up and pull the material way from me. I honestly can't see where this works, and sounds very dangerous. I think the confusion may lie in whether the rotation of the motor that this thread was started about, is currently correct or incorrect. I am going on the thinking it is correct, and that the original poster was just inquiring about the threading.

3/26/16       #16: Powermatic saw not reverse threaded ...
Pat Gilbert

Ok Mitch I see your point, if the motor is wired right then someone put a right handed motor on a left handed saw, seems like the only other possibility.


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