- Joined
- Jun 23, 2016
- Messages
- 30
I just finished restoring a 1966 Clausing 5914. I rebuilt the drivetrain and the rest of the machine but am not so thrilled with the amount of noise coming from the Reeves drive system. It works, and is very smooth, but above 1,000 RPM this machine is just too loud for my taste.....so, I'm looking at alternatives.
My first thought was to use the original Rueland 2hp motor with a Teco L510 VFD, keep the countershaft and use a 2-step pulley system w/ idler using micro-v belts. With this motor/vfd combination it seems like 30-90hz would be the range to avoid torque/hp loss and heat build up in the motor (at low RPM) so a two step pulley system seem necessary.
Recently I became aware of, and ended up purchasings a 3hp Marathon Black Max Inverter Duty Motor and a Hitachi WJ200 VFD. If you're not familiar with these motors they can be run down to almost 0 HZ while still maintaining 100% torque and run at 120hz while maintaining 100% HP. The motor is TENV (totally enclosed non-ventilated) so overheating while running at low Hz is a non issue. This style of motor seems perfect for the 5914 and would eliminate the need for a dual pulley system.
To further reduce the noise I'm also planning to do away with the cogged timing belt. It's just too loud. I replaced the stock belt with a new belt and that was even louder. I have already purchased a new spindle/countershaft pulley and will just turn down the cogs and machine in the grooves for the poly-v belt. Much quieter/smoother.
Initially I was thinking to keep the countershaft assembly but after looking at the pulley ratios from the counter shaft to spindle (3.625" Countershaft/6.125" Spindle) I'm realizing that with a 20hz to 115hz motor range my pulley ratio from motor to countershaft is basically 1:1 (~360rpm to 2000rpm @ spindle). Now I'm thinking of just going direct drive and bypassing the clutch/brake since the Hitachi WJ200 supports an external braking resistor (35ohm 400w = $35) If the VFD can stop/start the motor as fast as the clutch/brake why keep it?
Has anyone does this type of setup? Micro-V belt conversion with an Inverter duty motor 20-115hz running direct drive with a braking resistor hooked up to the VFD? This seems like the ultimate solution for the 5914. Dead silent drivetrain, full torque at low speeds, full torque HP at high speeds and a system that can stop on a dime without the rattling clutch discs.
Is there something I'm missing here? I would expect to see more people doing this but haven't run across much. Is it that the cost of the Black Max motors + WJ200 is so high? Any input appreciated.
My first thought was to use the original Rueland 2hp motor with a Teco L510 VFD, keep the countershaft and use a 2-step pulley system w/ idler using micro-v belts. With this motor/vfd combination it seems like 30-90hz would be the range to avoid torque/hp loss and heat build up in the motor (at low RPM) so a two step pulley system seem necessary.
Recently I became aware of, and ended up purchasings a 3hp Marathon Black Max Inverter Duty Motor and a Hitachi WJ200 VFD. If you're not familiar with these motors they can be run down to almost 0 HZ while still maintaining 100% torque and run at 120hz while maintaining 100% HP. The motor is TENV (totally enclosed non-ventilated) so overheating while running at low Hz is a non issue. This style of motor seems perfect for the 5914 and would eliminate the need for a dual pulley system.
To further reduce the noise I'm also planning to do away with the cogged timing belt. It's just too loud. I replaced the stock belt with a new belt and that was even louder. I have already purchased a new spindle/countershaft pulley and will just turn down the cogs and machine in the grooves for the poly-v belt. Much quieter/smoother.
Initially I was thinking to keep the countershaft assembly but after looking at the pulley ratios from the counter shaft to spindle (3.625" Countershaft/6.125" Spindle) I'm realizing that with a 20hz to 115hz motor range my pulley ratio from motor to countershaft is basically 1:1 (~360rpm to 2000rpm @ spindle). Now I'm thinking of just going direct drive and bypassing the clutch/brake since the Hitachi WJ200 supports an external braking resistor (35ohm 400w = $35) If the VFD can stop/start the motor as fast as the clutch/brake why keep it?
Has anyone does this type of setup? Micro-V belt conversion with an Inverter duty motor 20-115hz running direct drive with a braking resistor hooked up to the VFD? This seems like the ultimate solution for the 5914. Dead silent drivetrain, full torque at low speeds, full torque HP at high speeds and a system that can stop on a dime without the rattling clutch discs.
Is there something I'm missing here? I would expect to see more people doing this but haven't run across much. Is it that the cost of the Black Max motors + WJ200 is so high? Any input appreciated.