Help Building My Own 2"x72" Belt Grinder

R

Rebel_42MDx

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Apr 19, 2016
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Hello I am new to the forum. I've been bitten by the knifemaking bug and wish to proceed with slowly acquiring components to complete a 2x72 grinder.

I was able to obtain the following variable speed control device locally: Penta KB Power NEMA-4X/IP-65 Drive DC Motor Speed Control T79842 (MODEL 9338) for under $100.

My question is--what motor should I select to use with this variable control device?

I believe the max HP is 1.0 and that it will run at 3/4 HP using 110 current.

Will the 1.0 HP motor from automation direct work with this device?

Thanks in advance for any help with selecting the proper motor.

Reb
 
I believe a 1hp may be a tad undersized, I mean it will certainly grind and any grinder beats no grinder (in my opinion). Do you have a plan for the frame? I'm currently building my second grinder. I'm following the plans here http://dcknives.blogspot.com/p/2-x-72-belt-grinder.html?m=0

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If that's a DC controller, won't you need a DC motor to match it? It might be a bit harder to find a motor to mach, most of us are using 3ph AC motors.
 
Automation Direct does carry DC motors, and I don't see why it wouldn't work. 1 HP (or in this case, 3/4) is a little light for somethings, but still better than nothing.
 
Thanks for the input. I think I will seek a 3 phase set up. Right now I'm looking at the Oregon Blade Maker chassis. I've seen them run one with a variable speed Porter Cable grinder but I'd much rather set up a proper motor and controller. I'll see if I can find a similar controller in AC. Thanks, Reb
 
Rebel_42MDx said:
Thanks for the input. I think I will seek a 3 phase set up. Right now I'm looking at the Oregon Blade Maker chassis. I've seen them run one with a variable speed Porter Cable grinder but I'd much rather set up a proper motor and controller. I'll see if I can find a similar controller in AC. Thanks, Reb
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From an electrical standpoint I don't see any harm in using a DC setup, you just need to make sure you don't accidentally pick up a AC motor for it. I totally agree with Knife to a Gunfight- its a bit under powered, but for the price, its hard to beat and is lightyears ahead of a HF 1x30 or files and a guide.
 
I run a 110v 1hp motor on my grinder (that I re purposed from an old table saw). If you don't gorilla the blanks and let the belts do the work it will "work". I'm more worried about duty cycle on the 110v than anything. If I don't take a break and let the motor cool it will trip the thermocouple.

I would like to upgrade to VFR and 240v or 3ph 2hp motor when im not grinding on my front walkway. But 110v has advantages for those of us without a dedicated shop/garage area... :(
 
I put a 5 horse 220v 3450 rpm motor my sander build. I had the motor already otherwise I might have bought a smaller one like 3hp. I really like the speed and power though and if I was going to build again I would definitely go for high horsepower and high rpm. I have a 3 step pulley to give some speed range up to 7250 sfpm.
 
Dang son! That's a lot of horses for a grinding machine. ;)

Personally, I just built my own grinder and went with a 2HP 1800 RPM with a KBAC-27D AC drive set to 2x speed. I don't see myself really ever needing more than that, or being able to stall it very easily, if at all. The highest most guys will go is 3HP due to VFD costs once you go higher than that. Truth be told, 1.5HP is probably enough for most direct drive grinders, but if you're grinding on larger pieces and really pushing in, it's nice to have a little extra power.
 
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