Grinder in a box! DIY grinder kit

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Docwks
I would strongly suggest not using a 1750 rpm motor with this setup. It will spin way to slow!!!

Chris
 
I concur with Chris. A 3600 rpm motor is the way to go. I have an 1800 rpm motor on mine (had already purchased it), and it works fine for the small wheel. I'm lucky to have a 3600 rpm KMG to hog with.

--nathan
 
I will take your advise on the motor speed. I have them both so I'll use the 3600 and switch out only if I need to. I also had a blond moment last night, I got my tracking, drive and idler wheels from Beaumont. Pulled out the drive wheel, very nice, Tracking Wheel also, nice, idler wheel...Holy C#$% these "CNC" made wheel had metal sticking in the shaft hole 1/4" off center. I mean I was flustered, now I'm going to have to send them back and oh I really don't need this. So I went and got my caliphers to check the other wheels, maybe the guy had been smoking crack while making my wheels.... After checking the other wheels I put the caliper down inside the idler wheel to see how far out the wheel was so I could call and give them a piece of my mind and the offending metal moved. ? Ah the light blub clicked on; it's a floating center stupid, otherwise when you tighten up the bolt the wheel wouldn't turn. Ok, so I tried to explain to my wife and she said you really need to find a hobby that doesn't add to your stress, you have way to much at work and don't need more. :rolleyes: Ok wrong person to whine too. Anyway this weekend I'll be putting it together. Wish me luck!
Bill
 
I have used a worldwide motor on my last grinder, THey seem to work well and my local motor guy sells them. It meets all the requirements
TEFC, 56c face mount, base,3 phase,2hp
I say if you can not find one cheaper you pull the trigger on it.
Big question is what VFD will you use.
Chris
 
If you use a 3 phase motor (Variable speed) then yes it is absolutely necessary unless you have three phase in your workshop (Doubtfull if its a homeworkshop).
If you opt not to go thee phase motor route and just get a single phase 2hp motor you dont need a vfd and just plumb it to 220v and its a single speed grinder.
I keep hearing good things about the Teco-100 vfd's.
Chris
 
I still have alot to learn about electronics. And all I wanted to do was make a few knives. Sheeesh. I may have to stick with a single phase until my bank account will allow for the additional expense of the VFD. Thanks for the advice, Chris.
 
Just FYI, I paid less than that, including shipping, for a new Baldor on eBay. I found that if I search on the brand - Baldor, Leeson, Marathon, whatever - I get a much better search return than if I search on the specs.


Doc
 
Man I want to build one of these grinders so bad it hurts!

I have a question about motors, looking through the thread I noticed that 56c mount, 3600rpm, at least 1.5hp+, and a VFD are recommended/needed, is there anything else to check for? I looked around for a bit to get an idea of prices and most places have a bunch of other values listed, amps, hz(?), class, and the last one brings up another question, VOLTS.

Can I use 110V and run it into a VFD and get full oomph out of a 3 phase motor, or do I need to run 220 in?

This stuff is all brand spanking new to me, but I need to learn it, the ol' 1/3hp 4x36 Craftsman ain't cuttin' it anymore!
 
vfd's (IF you purchase the right one) turn single phase 220v into 3 phase 220v.
Therfore vfd"S are only needed if you purchase a three phase motor. If you do go three phase motor and vfd you get the great benefit of variable speed.
Or go single phase motor 110v or 220v and you get a single speed motor.
Chris
 
Thanks for the info, as for a VFD I am probably just going to mimic someones setup that knows what they are doing :D

I want the variable speed, so it looks like I need to get a 3 phase motor, and a VFD(probably the Teco that a couple others are using).

Do I need to run it on 220V? If so that means I need to get a very long cord or a new outlet.

So, if I buy a motor that is:

-56c
-1.5+ HP
-3 phase
-3450 RPM

......... it will work? Do I need to even consider the other values people list of the motors? Man, buying my used Crafstman on Craigslist was so much easier :D
 
Your voltage requirements are determined by the motor. Some can be wired for either 110 or 220. Regardless which voltage you use your VFD needs to match. 220v will typically give you a lot more power but running a long extension cord in order to get it may negate some of the benefit. Pretty much any motor you find over 1-1/2 hp will require 220v.
 
I have a question about the spring. I'm thinking of moving the spring under the arm and using a compression spring. I've seen quite a few pictures of builds and everyone uses a different type of spring or multiple springs to put tension on the Tracking arm. How much tension is required? Obviously you can have too much, does anyone have specs on how much pressure you need? Thanks.
 
I've never actually measured the amount of tension, but I like the belt tight enough that it "twangs" if I pluck it.

I don't see why you couldn't move the spring and use a compression spring. It would need a support so that it didn't launch itself to the side, but I see it as possible.

Jamie
 
:)
Should get the correct motor this week and then I should be able to start lineing up the wheels.
ADJ_arm.jpg


This is the adjustment arm with a spring pin.
Grinder.jpg
 
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