| Gallery, Projects and General > How do I?? |
| Lathe HP motor upgrade? |
| (1/4) > >> |
| Chazz:
So, there I was, taking a facing cut off of a 6" dia. x 1.5" thick 6061 round stock to make an adapter plate to mount my 3", 3 and 4 jaw chucks to my rotary table when low and behold, sniff, sniff, :zap: I smell that 'electrical' burning smell. Quickly, I reached for the E-Stop, oh wait, my 9 x 20 import doesn't have an E-Stop, so I turn it off. Anyway, after 3 1/2 years my Rong-Fu .75 HP motor bit the biscut! :palm: :doh: So after some research, is there anything I should be leeary of by beefing the motor up from .75HP to 1.5HP? Thanks, Chazz |
| kvom:
Be leery of another Chinese motor. If you were to get a 3PH motor and a VFD you'd have a variable speed reversing lathe without changing pulleys or gears. |
| Chazz:
Actually, I'm looking at 'U.S. Motors' 1.5HP, 220 3 Phase 'Accu Torq' vector drive and a Temco VFD (CF12?) featuring single phase 220 in to 3 phase 220 out + an additional analogue input on the VFD so if the day comes to CNC the Lathe, the motor (spindle) can be controlled by the CAM software. I was more concerned about the casting, etc with a 100% increase in power. I did purchase new spindle bearings rated at ~ 8,500RPM with grease and 12,500RPM with 'oil bath'. Cheers, Chazz |
| Chazz:
I forgot to add, with the VFD, I don't have to buy a big honkin' 100LBS Rotary phase converter! :headbang: Cheers, Chazz |
| andyf:
I'm a bit puzzled. Have you let the smoke out of the motor itself, or just out of the terminal box shown in your pic? As to power, I replaced an AC 1/3 HP one on my small milling machine with a DC one from a running machine/treadmill, so I could use a simple variable speed drive. The replacement is 2HP, according to its label, which really is overkill. It has had no adverse effect on the mill, but if I tried using a 1" slot drill to chomp out a 1/2" deep slot in one pass, something would give. I don't ask the machine to work any harder than I did with the smaller motor; it simply isn't rigid enough. Andy |
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