Elec Motor spinning

From time to time it would be handy to have a small metal cutting bandsaw.
I was noticing that my wood bandsaw has the drive pulley exposed underneath
which conveniently is two speed so has an unused space for another belt. It
would be possible to rig up another motor with gearing to get the blade
speed into the proper range. So the question is - can I just rig up two
motors and apply power to the one for the speed needed or is free spinning
the other motor bad for it somehow? And I do realize that hot metal chips
in sawdust can be a bad thing and recognize the need to clean it out
thoroughly before switching over.
Thanks.
Steve.
Reply to
SteveF
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Why bother with a second motor? Use an intermediate step pully and gear the motor that is there down. Two benefits: 1) Cheaper, 2) Increased torque for cutting tougher materials.
Reply to
TheAndroid
Or put on a 3 phase motor and a VFD.
Gunner
The two highest achievements of the human mind are the twin concepts of "loyalty" and "duty." Whenever these twin concepts fall into disrepute -- get out of there fast! You may possibly save yourself, but it is too late to save that society. It is doomed. " Lazarus Long
Reply to
Gunner
The slow speed motor would bne badly overrevved when using the high speed motor. You'd have to apply a one-way clutch to that motor to keep it from being a grenade under there.
-- Why do penguins walk so far to get to their nesting grounds?
Reply to
Bob May
It will work fine as long as you don't overspeed the either motor more than 2X it's rated speed when the other is running. This precaution is to prevent possible rotor damage. Spinning a unpowered motor has no effect other than some additional bearing wear which should not be an issue in your case.
Randy
Reply to
R. O'Brian
Now that it's been pointed out I would be spinning one motor REALLY fast. Thought about the VFD but would need to run it around 2-4 Hz to get things slow enough. Found a parts diagram for the Delta metal/wood saw and they just use two step pulleys with huge changes in diameters so I might see if those could be retrofit to my saw.
Thanks all. Steve.
Reply to
SteveF
do a google search on >one-way clutch< [I get 175k hits] you only need one to keep the slow speed motor from being driven. Most likely your local bearing supply has one in stock.
Reply to
F. George McDuffee
Don't know what Delta saw that is, but I've got a 14" Delta wood/metal saw. It has a gearbox as well.
4-step pulleys on the motor and on the gearbox input shaft allow any of four geared speeds for cutting steel, brass, etc. For wood (or aluminum), a large pulley on the wheel shaft is driven by one of the steps on the motor pulley.
To switch between wood and metal you change to a different belt and then throw the gearbox engagement lever.
To get steel cutting speeds with pulleys, you'd probably need a jackshaft to step it down twice. Plus, you need a lot of torque - which might cause a belt to slip.
John Martin
Reply to
John Martin

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