Grinder electrical question

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DCbladeworks

Joined
Nov 27, 2020
Messages
15
Hello, hope this is the right spot for this question.. in the middle of shopping for a 2x72, based on my research I looked i to having 220 ran to my shop to give me more options, the quote I received will allow me to get the 220 installed. The electrician asked what configuration of receptacle I wanted and I couldn’t answer that. What type/ configuration of 220 plug comes with or most commonly used on a 220 motor for grinders? Sorry for the long winded question. Thanks for any help
 
So Im looking at a 2hp 3 phase 56c 1800 rpm tefc motor and a kbac 27d vfd, will this set up plug in to that 220 outlet and give the full 2hp and variable speed? Thanks.
 
Yes, a 20A outlet is more than enough for a 2 HP grinder. You can run the KBAC 27D on 110V with the same motor, that will give you 1.5 HP. You could start with that and see if you really need the extra power. I have that setup and see no need to go to 220V.

If you plan to add more 220V equipment in the future (welder, heat treat oven, air compressor etc.), it might make sense to put a small subpanel in your shop instead of just a single outlet.
 
Ok that makes sense, so running 110 with a 2 hp motor will I be getting a full 1.5 hp? I think 1.5 will be fine for my needs and getting the 2 hp gives me future options, i just dont want to produce less than 1.5 going with 110 after buying a 2hp motor..
 
DCbladeworks said:
Ok that makes sense, so running 110 with a 2 hp motor will I be getting a full 1.5 hp? I think 1.5 will be fine for my needs and getting the 2 hp gives me future options, i just dont want to produce less than 1.5 going with 110 after buying a 2hp motor..
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The KBAC 27D is the only drive I am aware of that can get 1.5 HP on 110V. As long as you use that drive, you can change between 110V and 220V by changing a couple of jumpers. I have a Leeson 2 HP motor on a KBAC 27D and run it on 110V.
 
You will be happier with220V. I had 110 in the older shop and when I finally ran 220 out it was like I had a different machine. You can also plug a HT oven into the 220V socket, as well as a welder. If you get a Coal Iron press someday, you will really like the 220V model over the 110V one.

All of these devices can be run on 110V, but they work better on 220V.
 
Thanks for all the great info... i continue to research and get all the info possible to make the right choices, Im on the hunt for a used Leeson or Baldor motor, in my searches and comparisons I came across 2 import motors, Ironhorse and Techtop. Both seem to be the in the top for import motors.. techtop has a following as a top tier Chinese motor if there is such a thing, they have aluminum bodied ac motor that is highly touted by some but I cant find any hard data on Aluminum VS steel or cast iron bodied motors for knife grinding purposes. Anyone have any input as to pros or cons to a aluminum motor with all else being equal such as power, rpm, phase etc? Below is a pick of the techtop.
 
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Thanks for all the great info, Ive decided to bite the bullet and have 240 ran to my shop and go with a 2hp motor, now the rpm question, i will be running a vfd most likely the kbac 27d, knife makers and grinder builders are mixed on which rpm motor to go with, im aware the speed can be doubled with the vfd, i wont be hogging a ton of metal as I use the bandsaw to cut out my blades, would like the speed and torque for some profile clean up but want to get slow enough to polish and form handles, drive wheel size is still open. So which rpm motor would be best to go with?
 
There are many posts about 2-pole vs 4-pole motors on the forum, see e.g. here for a detailed post. To summarize, the 4-pole (1800 rpm) motors have more power at lower speeds. That said, there seem to be a whole lot of people that happily run 2-pole (3600 rpm) motors, so I tend to think there probably is not much of a difference in practice.
 
DCbladeworks said:
Thanks for all the great info... i continue to research and get all the info possible to make the right choices, Im on the hunt for a used Leeson or Baldor motor, in my searches and comparisons I came across 2 import motors, Ironhorse and Techtop. Both seem to be the in the top for import motors.. techtop has a following as a top tier Chinese motor if there is such a thing, they have aluminum bodied ac motor that is highly touted by some but I cant find any hard data on Aluminum VS steel or cast iron bodied motors for knife grinding purposes. Anyone have any input as to pros or cons to a aluminum motor with all else being equal such as power, rpm, phase etc? Below is a pick of the techtop.
Click to expand...
On your question about Techtop as an aluminum body motor - never heard of them, and never used an aluminum body motor. I'd like to hear comments pro 'n con on aluminum also. Do you have a link to Techtop motors at a decent price? I only found one place and they were EXPENSIVE there. >$500 for a 2hp 3 ph aluminum body motor vs <$200 for a 2hp 3ph Ironhorse motor.

2 pole vs 4 pole - I'd go by price for in use I doubt seriously you'll ever know the difference in using them.
 
I'm a electrician by trade. Took over my two car garage for all my hobbies years ago. I have a 100amp service in the garage. I installed a 220v circuit for my home made heat treat oven. I certainly have the knowledge and money to wire my grinder as 220V. But I have a KBAC drive NR grinder and just wanted to get it up and running quick. Three years later I still can't see why I need to run 220v to it as it does every thing I need on 110v. Your mileage may vary.
 
The only way I can answer that question is to suggest if you ever get a chance to use the same grinder on 220V for an afternoon, you would see tge difference. I agree that for most tasks it works fine on 110V, but for heavy hogging you will really enjoy the extra 1/2HP you get on 220 ( assuming it is a 2HP motor).
 
DCbladeworks said:
Thanks for all the great info... i continue to research and get all the info possible to make the right choices, Im on the hunt for a used Leeson or Baldor motor, in my searches and comparisons I came across 2 import motors, Ironhorse and Techtop. Both seem to be the in the top for import motors.. techtop has a following as a top tier Chinese motor if there is such a thing, they have aluminum bodied ac motor that is highly touted by some but I cant find any hard data on Aluminum VS steel or cast iron bodied motors for knife grinding purposes. Anyone have any input as to pros or cons to a aluminum motor with all else being equal such as power, rpm, phase etc? Below is a pick of the techtop.
Click to expand...
Don t worry about that .I use aluminium/cast iron body motor all my life , nothing is wrong with both of them . All my grinder use AL housing motor .
This is Techtop motor ............
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Reading the motor bible on dcknives its written the motor shafts of at least 2” is preferred, all the motors Im finding in the range I want have 1 7/8 shafts Im assuming thats close enough for most drive wheels but we all know what assumptions get you when you are a budding expert. Cant find anything definitive so Im asking the real experts. Am I good with a 1 7/8 shaft?
 
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