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| Lathe HP motor upgrade? |
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| Chazz:
Hi Andy, the smoke was out of both the starter box and motor. The motor shaft no longer spins freely. :( I'm puzzled too, :scratch: I've never seen a 2HP motor run on 115v, unless (depending on the wiring) you are only using 1/2 the motor and actually only getting 1HP? Here in North America (I think) a typical 115V outlet can deliver 1200watts? and a 2HP motor uses 1500watts? (not an electrican type) Cheers, Chazz |
| andyf:
Sounds well fried, Chazz. We get much more oomph out of each 230V domestic socket here in the UK - up to 13A, or about 3kW. Our modern wiring regulations allow numerous such outlets in a ring circuit with a 30A circuit breaker in the "consumer unit" on the assumption that 30A in total (nearly 7kW) is unlikely to be exceeded. If my 2HP DC motor, badged "Leeson, Wisconsin" and in much smaller letters "Made in China" really is 2HP (about 1.5kW) output, and due to general losses in the speed controller and motor it actually takes 3kW input, then it is just about on the limit for its socket outlet (and the 13A fuse in the mains plug). But as I said, I only use a fraction of the available power, and the controller incorporates a soft start, so it probably never draws more than 1kW. :zap: Treat my remarks with caution; like you, I'm not an electrician. Andy. |
| John Hill:
Chazz, I am sure you can draw more than 1500 watts from your domestic supply, typically for things like a clothes dryer and radiant heaters. But to answer your question, I doubt an increase in motor size will cause you any problems provided you dont work your machine any harder than before. The most likely frustration, in my opinion, will be related to getting the new motor onto the mountings intended for the smaller one. |
| 75Plus:
--- Quote from: Chazz on October 13, 2011, 02:03:13 PM --- Here in North America (I think) a typical 115V outlet can deliver 1200watts? and a 2HP motor uses 1500watts? (not an electrican type) Cheers, Chazz --- End quote --- In the US the standard wiring for 115 V outlets is 12 ga. copper wire rated at and protected at 20 amps, fuse or circuit breaker. This would actually handle 3 hp but it would be pushing the envelope. |
| kvom:
--- Quote from: Chazz on October 13, 2011, 12:29:48 PM ---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 --- End quote --- I can't say I'd want to spin many lathe chucks very fast on a chinese rongfy type lathe. My 10ee does go up to 4000 but the fastest I've ever tried is about 2500 with a collet chuck. The motor/VFD combination sounds good. |
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