Torque and slowing down an AC motor ?

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I'm wanting to slow down occasionlly a bandsaw we have. I've already
used an idler pully to slow it down so that it is at the correct speed
for cutting brass but I sometimes cut nickle silve or steel and it goes
too fast for them and ruined the blades.
So my idea was to use an SCR to find the speeds for cutting these
other materials. But if I slow down the motor by 75% to 60% how is
this ging to affect the torque?
Would a different low horse 110 motor be better than another for this?
Ken