making a disk grinder

SteelSlaver

SteelSlaver

Joined
Feb 17, 2007
Messages
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I have been doing some serious Overtime at work and want to spend some on making a disk grinder. I have a spare 2hp reversible motor. I would like to make a stand with the motor underneath and on a pivot with a 4 pulley stack. Then on top mount a shaft on pillow block bearings and have a 9" disk on one end and a 12" the other. Mount a adjustable table I have laying around on the 9" end. My questions are.

Source for the disks. I could make them but, would prefer to spend time in other ways. Didn't grizzly have a separate steel 12" disk for sale. Can't find it in catalog.

Can I just use a couple pillow bock bearings or do I need to use some kind of thrust bearing in the set up. If so what is a god one and a way to mount it. I know there are some make a disk how to threads, but, search doesn't show them.

Thanks again Jim
 
Jim, look up the manuals for the Grizzlies that have the appropriate sized discs and note the part number for the discs. Call Grizzly and ask them prices for the parts.

Rob Frink @ Beaumont Metal Works sells both flat and beveled 9" aluminum discs.
 
Bet you could find a disc on Ebay for a good price, might wanna check that out.
 
Hello Jim,

Here are some pictures of the disk sander that I put together a few years ago. Just used plain pillow blocks and the disk came from Rob at Beaumont.

Hope this helps.

Take Care
Charles

knives2151.jpg

knives2155.jpg

knives2152.jpg
 
i made mine by taking a large speaker apart and removed the magnet from the speaker. there is a washer and what looks like a hub. i put that in the lathe, drilled and then reamed a hole. i attached that to a shaft that was indicated in and trued it up. once i had this done i marked it out for 4 countersunk head machine screws, attached my aluminum plate and trimmed off the excess on a bandsaw after i marked out the radius. i then finished turning the od and trued up the face. i have picks if you wish to see the backside.
 
Hey Thanks for all the information and sources. I am going this route mainly because I want to be able to reverse the disks. I was just wondering anyone knows if the Grizzly 12" disk can be rewired for reverse. If so I might get one of those and add a reverse switch. But. It doesn't look like builtng one would be to bad. Thanks again Jim
 
Hey Charles thats pretty sweet set up, thos e look to be the aluminum disk that Rob has correct.

I purchased 2 of the flat steel disk Rob made and have just a single disk set up at the moment but plan to build about the same grinder Charles shows in his second picture.

I had my disk grinder under the bench and torn down, was using the VS for something else. When I started building folders I found it to be irreplaceable for flatting parts.

Charles how much are one of those brakes?

Spencer
 
Hey Spencer, yes they are the aluminum disk from Rob.

I'm not sure what you are asking the price of when you are talking about a brake, if it is the thing with the red handle that is a reversing switch.

Charles
 
Sorry my bad yes the reversing switch, also did you turn your own shaft on the second grinder?

Thanks
Spencer
 
ib,
If you can afford it go for the Variable speed. It works so much better. If Either of my discs went down I would not hesitate to do it right and make a variable. Step pulleys are ok but if you have 220v a VFD is the way to go. The motor was off EBAY got 2 for $150 delivered 3ph 1hp and 1.5hp. VFD was also EBAY fodder for $125 and I made the disc myself from $65 in materials so for $265 I had a Killer Variable Speed Reversible Disc grinder. I use 9x11 sheets and trim them on the disc. Easy and Cheaper than precut discs. As I have mentioned before, I do all my grinding on the disc. I do not even own a belt grinder. This is how I learned and love it.

Chuck
 
The shaft was purchased as you see it but I had to cut the keyways.

Chuck you are correct about the variable speed, when I find a good deal like you did on the motors and drive this one will be variable.

Take Care
Charles
 
Charles, that's a great loking machine!!!

It looks like you have some of the early aluminum disks ...back when the Hub was welded on. Boy, those were tough to make. As much as I tried...I just couldn't get comfortable welding aluminum.

Thanks for posting those terrific photos.

Sincerely,
Rob
 
Like Mike said, you can buy them as spare parts. I got a 9" aluminum disk from Harbo Frieght for 9 bucks. I just called parts and asked them for a replacement disk for a 6x48 belt + disc sander on their website. The disk has a hole through the center for the shaft, so that is one downside compared to some of the more expensive, completely solid surface ones.

Overall it's a nice disk for 9 bucks.
 
I think I am going to built one like Charles with 2 disks and use a shaft. I will get run it with the steps and keep my eyes open for a good 3ph 1hp and get a VFD. Not to spendy for 1 hp motors. I just got my vfd for the 2hp I am going to mount on my KMG. Just time right now with all the work. Trying to figure out the directions too. LOL
You would think there is a simple diagram with the thing to connect 1ph 220 to a 3phase motor in the manual. Later need sleep.
 
ib,

You can run all your motors from the same VFD. I run my disc, mill and buffer all from the same unit. Just need to set up plugs. It can be a pain to change the plugs but since I am the only one working the inconvenience is worth the control.

Chuck
 
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