2x72 Grinder Build Questions

G

gatorforge

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Jul 2, 2010
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Hello and thanks in advance.

I'm looking at building my first 2x72 and will likely build or buy the GIB style frame.

I intend to install a 2hp 3 phase motor, and would like to install a vfd.

If I only have 1 phase running into the house, does the vfd handle the conversion, or do I need a separate inverter (electronics are my weakness)?

What are the best wheels to use for this set up if I intend to run a flat platen?

Does one typically buy a tool rest or is that a make your own project?

With the Polar Bear Forge GIB 2.0 flat platen set up, do you need a separate arm to actually hold the platen, or does it bolt right on?



Again thanks in advance.
 
Do you have access to 220 single phase where the grinder will be?
If you do, then the teco fm-50 will take single phase in and power your 3 phase motor.
I don't know if you can get 2hp from 110.
Also you're going to need to protect it from metal dust if you go this route.
I recently did this with the help of some of the guys on here.
 
VFDs can either be 3phase in to 3phase out, or 1phase in to 3 phase out. USUALLY, the 110/220VAC powered VFDs are single phase in... just make sure you're aware, especially if ordering used.

Like Josh said, you probably won't find a 2hp VFD made for a 110VAC feed, so make sure you have a 220 outlet, or can hardwire to a 220VAC breaker.

For running a basic KMG style flat platen, 2" wheels on either end will suffice. In fact, you may be just as well off to buy the platen from KMG, although, I think there may be a couple of cheaper options of ebay as well, wheels included. Some makers like to make a rotating platen which will typically use a different sized contact wheel on either end. If you want to grind profiles using the wheels, opt for poly or rubber wheels on either end.

As for tool rests, I usually make my own, as I can make it to what ever size or configuration I want.
 
If I only have 1 phase running into the house, does the vfd handle the conversion, or do I need a separate inverter (electronics are my weakness)?
The VFD converts single phase household power to three phase for your motor.

What are the best wheels to use for this set up if I intend to run a flat platen?
Beamont Metal Works makes the best wheels, I got a set of wheel off of ebay from vwjackstraw. They are very well made and I highly recommend him.

Does one typically buy a tool rest or is that a make your own project?
You will have to make a tool rest.

With the Polar Bear Forge GIB 2.0 flat platen set up, do you need a separate arm to actually hold the platen, or does it bolt right on?
You will have to furnish the 1-1/2" sq. tool arm. The flat platen bolts onto the platen assembly of the kit, but you have to fabricate the mounting brackets and flat platen.
 
Thank you all for the input. One last question, what is the ideal rpm for the motor? I have seen quite a few people in the 1700 range, but some seem to be running 2500+.
 
gatorforge said:
Thank you all for the input. One last question, what is the ideal rpm for the motor? I have seen quite a few people in the 1700 range, but some seem to be running 2500+.
Click to expand...
I run a 1-1/2hp 3ph 1750rpm motor with a KBAC-27D VFD set at 2X so that I double the speed of the motor. This set up works great for me.

Here is a good thread on the subject that has advise from some very knowledgeable knife makers:
http://www.bladeforums.com/forums/showthread.php/1020613-Yes-another-grinder-motor-question
 
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