motor for KMG grinder

The Count,

In one of your other posts and this one you mention to get a toggle switch rated for 2hp if you have a 2hp motor:

Re the main power switch

I used a toggle switch

You could use a SPST switch, but in case the live/neutral lines are reversed on an outlet , and in general I just over build things, I used a DPST and switched both lines.

http://www.gardnerbender.com/pdf/products/Switches.pdf

Both rated at 1.5 HP which is the motor rating, if you had 2 HP motor ,you would base the switch on that.
GSW-14 is what I used

GSW10 would also work.

GSW20 is the boot cover – probably not available at the stores listed above, but automotive parts suppliers tend to stock them.

I was able to buy it locally at HomeDepot / Lowes / Home Hadware /
Canadian tire also lists it, and youcan check inventory online by selecting your local store
http://www.canadiantire.ca/AST/brows....jsp?locale=en

I used crimp on eyes to attach the wires to.
Click to expand...

Do they sell 2hp rated toggles? will GSW-14 work on mine if I'm running a 2hp motor but will be using 110ac which will reduce it to 1.5hp(according to the forums)? I didn't find anything that was rated for 2hp the gardnerbender or homedepot website..
 
work765 said:
The Count,

In one of your other posts and this one you mention to get a toggle switch rated for 2hp if you have a 2hp motor:



Do they sell 2hp rated toggles? will GSW-14 work on mine if I'm running a 2hp motor but will be using 110ac which will reduce it to 1.5hp(according to the forums)? I didn't find anything that was rated for 2hp the gardnerbender or homedepot website..
Click to expand...

I can't find any 2hp on those sites now either.


Using it at the ratings is fine,


Bigger is better if you will use the full 2hp you can get them from speciality shops.
 
I can't speak for the Count as to what he used, but the main point is to use parts that can carry the current drawn by the motor.
Most normal household switches are rated at 15 amps. A 1HP motor runs fine on these.
Heavy duty switches are 20 amps. A 1.5HP motor will run good on that.
A 2HP motor draws just about 20 amps, so you should use a switch rated at 25-30 amps.

As long as the switch and wiring are rated at around 25% above the current draw of the motor, you will be fine.

One common reason motor switches on grinders fail regularly is people use switches that are too light duty. Heavier current switches are more costly, buy money spent once is always a better choice.

While on the subject, using proper wiring size is important. Besides the risk of fires if the wire is greatly undersize, a wiring run or power cord that is just barely below the correct size may not burn up, but will create a small amount of heat and use up some of the current the motor needs. If the wiring, power cord, or extension cord to the motor get even a little bit warm, replace them with a larger gauge.
 
if you look at the kbac factory switches, they are not rated for the hp motor bring used. I believe they intertupt the circuit and don't actually carry the motor current through them. my kbac 29 that is rated for 3hp should need much more substantial wiring if the current was being carried through it.
 
The switches on the KBAC unit control electronic switching circuits with milliamps of current. The switches I am referring to are the power switch that turns the power on to the KBAC or a switch in the line to the motor.
 
Hi, I bought a stock KMG grinder from Beaumont Metal Specialties in Ohio and then bought a 1.5 hp 3 phase motor from Wayne Coe and I bought a kbac variable speed drive from another source. My grinder has 5 inch pulley connected to a 2 1/2 inch pulley which runs a 4 inch drive wheel on the KMG. I believe it runs at about 3650 surface feet per minute. I was going to buy a 2 hp motor but Wayne Coe talked me out of it saying that I could run my grinder on 115 volt power and would have plenty of power to grind knives. The motor will sometimes trip a power strip circuit breaker when heavy grinding with a flat platen but I did not have to install 220 volt wiring in my shop. That is the only advantage I can see. I am happy with the set up and have ground over a hundred blades with this setup but if you have a 220 source in your shop I would get a 2 or 3 hp motor. That being said I can grind at below 30% on the drive easily which I like to do with fine belts to keep from burning material. 1.5 hp works well for me but 2 hp would be extra special in my opinion.
 
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