I never understood why the Harrison motor bracket is supported with the long "adjustment" screws underneath. My motor is certainly not heavy enough to tension the belt by weight alone. The design almost seems to be upside down. And getting the motor tensioned and horizontal is another challenge. My motor is 1.5HP and it has never lacked grunt even at hight speed (1500 rpm spindle speed by means of a double size drive pulley) but it's powered by an industrial grade inverter with advanced torque control. The Harrison-fitted 2-speed machines (2000rpm max spindle speed) had 3HP motors from new. Cheers
@MJBEngineering
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Stupid design. A better option would be a captive plate that moved up and down with those screws. Might stay square and level then! I may look into new rubber mounts to reduce vibration. The new motor is a fair bit louder than the old motor. I could balance the motor which would help. I came across a good firm some years back at a trade show called AV Industrial - specialise in anti-vibration mountings. Yep that is the reason I went with the 3.0HP, the two-speed motors are definitely a big upgrade. Don't get me wrong there was nothing wrong with the 1.5HP motor, but I sometimes have to knock 50mm stock down to top hat shapes which means a lot of passes at 1.0mm DOC. Last night i took a few 1.5mm cuts with no problems. I have ordered a 90mm taper lock pulley which should be arriving at my bearing supplier today, this will give me 1000RPM instead of 750RPM which will be more than ample and should not interfere with changewheels nor cause much drop in torque. I have a Mitsubishi D700 inverter to fit to this lathe at some point - more for jog control. That'll be another video.
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