Harrison M350 lathe - Need manual. Results 1 to 7 of 7 Thread: Harrison M350 lathe - Need manual. Thread Tools. Show Printable. M250, M300, M390. M250 Lathe An Operating, Service & Parts Manual is available for the M250 Now out of production, the M250 of 145 mm (5.7') centre height was designed to appeal to schools, training establishments, repair shops and those needing a strong, properly-built but compact lathe for light production work.

I acquired a nice Harrison steel lathe this week(new toy! ), and other than still trying to find the best way to move the 1600+ lb beast -into- the shop, I also have to change the motor, as it is equipped with a 3 phase, 550 volt motor right now. Question is, what's the equivalent 110/120v motor, in amps, please? The 3ph/550 motor is rated at 1.67 amps, which looks to be about 1 to 1-1/2hp. But today's motor horsepower ratings are so skewed, I ignore all hp numbers and only go by the motors' amp ratings when comparing. I know that a 220/240v motor pulls half the amps that it would at 110/120v, but can't remember if the amp draw drop is linear or what as we continue upward in voltages, as well as 3phase VS single phase, and whether or not that makes a difference in actual motor HP. Since I need to find or buy a motor for this thing, I'd rather get the right one the first time.

Posts: 787 Joined: Fri Jan 06, 2012 12:08 pm. You confirmed my math, as I calculated I will need a motor rated at 8.3 amps at 110v, which here is about a 1/2 HP motor. Why do you think the existing one is around 2HP? A 1/2 HP motor does seem small for this size lathe(it's a Harrison M250; 11' swing, 30' bed), which is why I'm second-guessing my math. I'd rather not bring any transformers into my shop; they take-up space(of which I'm running out of!), create heat and I've never met one that didn't hum. Besides, motors are cheaper and easier to find.

Once I know for sure what I need, I'll put the 3ph motor up for sale or swap on the local swap lists in hopes that someone can simply swap the motor I need for the one I don't. Posts: 787 Joined: Fri Jan 06, 2012 12:08 pm. If you're correct, and I think you are now that I've read-up further, then I need a minimum 7.2 amp/220v motor to replace the 3phase one. THAT will cost more than anticipated. Paragon partition free. And now the VFD you mentioned begins to make more cost-sense(and having read-up a bit on them just now, I also see they are not transformers or anything like that).

Can you elaborate further on the 2kw FVD, please? Will I get the same power(HP/torque) from the motor, or is there a loss? I appear to be getting conflicting information in my early reading on the subject. Posts: 787 Joined: Fri Jan 06, 2012 12:08 pm. I do have some experience with VFDs, as I have used them for test rigs where we needed vairable speed. In theory, they should give full torque at any speed, but guess that is a truth with some mod's to it, even if this is where they really excel. I also notice they are used more and more as 3 phase converters, where 3-phase is not available.