Question on buying this surface grinder

[projectnut]

This is where I got my SPC, quite happy with it.

WNY Supply Online store for static phase converters

phaseconverterusa.com

I've heard it claimed that, because the motor is only powered on 2 of the 3 legs when using an SPC, it can affect finish of the grind. Of course, I've also heard that claim for lathes, but I'never noticed it.

I would agree. My surface grinder came from the factory with a single phase motor and it's worked fine since 1954. The spindle is belt driven rather than direct drive.

 

[Brento]

This is the motor for the grinder.

 

[DavidR8]

This is the motor for the grinder.

That looks exactly like the motor plate on my Parker Majestic. For what it's worth I ran it off a 120v 15A outlet with a 120v -->240v VFD.

 

[Brento]

I am fine with running 220 or 240 but bc i cant do 3 phase. I just need help on finding a vfd to use.

 

[DavidR8]

I am fine with running 220 or 240 but bc i cant do 3 phase. I just need help on finding a vfd to use.

I've had excellent luck with Teco, but have also heard good things about Hitatchi, Durapulse, ABB.

 

[mksj]

VFD Teco, L510-201-H1-U, 1 HP, 230 Volts, 1 Phase input $168. Issue with 120V input VFD's is they usually are plugged into GFCI sockets which will trip when used with VFD's, but if you wanted to use 120V socket, then that model number would be L510-101-H1-U which runs around $20 more.

Teco-Westinghouse, L510-201-H1, 1 HP, Variable Frequency Drive 230 Volt, 1 Phase Input, IP20, at De

Purchase Teco L510-201-H1-N 1 HP Variable Frequency Drive from Dealers Electric

dealerselectric.com

 

[7milesup]

Hey Brento.
I have a Bridgeport 815 surface grinder which I run off of 220 single phase. I purchased this VFD from Amazon however, it is a rather el-cheapo one. Mark (@mksj ) has some excellent recommendations for you.
The power requirements for a surface grinder are very low. The largest draw is during startup of course. When I am doing any grinding, the amp readout is a fraction of the motor rating. It has been a long time since I looked at it but I want to say that I saw something on the order of 2.0amps when running. I feel that the SG manufacturers put a 1hp grinder on these small ones because that was what was available.
I should also mention that having a VFD programmed for a soft start on the SG is really nice, just don't program a brake into it because that would not end well.

 

[Brento]

Well idk how to do any of that stuff @7milesup it will be new for me and i may have someone on here talk me through it step by step. I will be running my own electric. I am fine running 220. It doesnt need to be 110. I just need something to convert from 3 phase to single phase. @mksj

 

[7milesup]

I just need something to convert from 3 phase to single phase

I believe that may be the other way around

Let us know when you are ready, there is a ton of knowledge on here.

 

[Brento]

Anyone with grinder experience can you tell me what type of dressing sticks i will need? I have quite a few diamonds but supposedly that is just for trueing a wheel and i need dressing sticks to dress a wheel after. This grind is coming with a Norton Brake Controller truing device.