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Machine Shop and Tool Talk

Large Grinder Question!


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  #1  
Old 03-11-2014, 07:01:09 PM
930dreamer 930dreamer is offline
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Default Large Grinder Question!

I'm looking at this grinder, seller doesn't know what size it is, data plate is unreadable. He tells me it is currently wired for 240v single phase( by an electrician) and will slowly start and build up to working speed.

I can't imagine this being a single phase grinder but who knows. I'd need to see how many wires it has. I have several pieces of three phase equipment that I run on a rotary phase converter, will/can a three phase grinder run on two legs of 240v? Thanks all.

edit: A rpc runs on two legs of 240v but most of my rpc's need to be spinning almost to operating speed to start.
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  #2  
Old 03-11-2014, 09:44:17 PM
J.B. Castagnos J.B. Castagnos is online now
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Default Re: Large Grinder Question!

He may have added a capacitor to start - run it. It would probably produce 2/3hp.
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Old 03-11-2014, 09:57:23 PM
JerryLee JerryLee is offline
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Default Re: Large Grinder Question!

It may be a squirrel cage motor. They have low starting torque and are often used on fans in residential AC systems. AC fans have very low mass so they are easy to get up to speed. A bonus is that they typically run smoothly and quietly.

That's a nice looking grinder. I wish I had it in my shop.
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Old 03-11-2014, 11:04:55 PM
930dreamer 930dreamer is offline
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Default Re: Large Grinder Question!

I'm waiting for more pictures, I think the seller stated it had no capacitors? Maybe the reason for the slow starting? I'd hate to slip and get a tool in the wheel- need two tool rests.
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Old 03-12-2014, 12:11:03 PM
ChipTosser ChipTosser is offline
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Default Re: Large Grinder Question!

My guess is: that it has a motor starter. That's a mighty high load motor, not to be 3p . I'm guessing 3-5hp, if the persons load factor is not balanced it will start slow. That can be contributed to not having enough capacitance in their rotary conversion, if using a converter or too small of a motor driving the convertor, or they are using a static convertor, that is not sized properlyl.
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Old 03-12-2014, 04:52:11 PM
sasquatchm sasquatchm is offline
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Default Re: Large Grinder Question!

Sweet old grinder, built to last centuries!! Beauty!!
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Old 03-12-2014, 06:40:43 PM
930dreamer 930dreamer is offline
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Default Re: Large Grinder Question!

Quote:
Originally Posted by chiptosser View Post
My guess is: that it has a motor starter. That's a mighty high load motor, not to be 3p . I'm guessing 3-5hp, if the persons load factor is not balanced it will start slow. That can be contributed to not having enough capacitance in their rotary conversion, if using a converter or too small of a motor driving the convertor, or they are using a static convertor, that is not sized properlyl.
No converter used, single phase 240v.
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Old 03-12-2014, 07:54:55 PM
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Default Re: Large Grinder Question!

I never looked at the data plates on them, but I have used a couple big old grinders like that many many years ago that were always pretty slow to start up and also took forever to come to a stop again when you shut them off.

They were Very Smooth running though.

I'd love to have one of them, but currently don't have the electric capacity to run one. My whole house (and garage) only has 60amp electric with 4 screw in fuses. Have to tap into the electric range plug in to use my old welder.
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