Attaching a 9in disc to 2x72

Justin Schmidt

Justin Schmidt

Joined
Feb 18, 2016
Messages
2,209
So i need a 9in disc set up. But im broke. From what ive seen the biggest cost is getting a new motor and vfd. Both of which most 2x72 have. So im wondering if there is a way attach the disc to the drive wheel. Has anyone done this? How would i even go about it?
 
F2CF4684-6DEA-41FD-9BCE-AF269E8F838B.jpeg
This is a photo of what I used for 3 years. I had a Neilsen disc assembly attached to the keyed end
of the 5/8” shaft. I thought I would use the chuck end to hold a buffer or scotch disc but never did.

It worked great, but after a while I wanted to just walk up to a disc sander and do a quick touch up so went with a independent disc.
 
I know both, Coote and Hardcore have disc attachments for their grinders, a bit different but similar in concept I believe.

Here's the Hardcore:
dga-p_1.jpg

For better pics: http://www.trick-tools.com/Disc_Grinder_Attachment_for_Hardcore_Billet_Aluminum_Grinder_DGA_P_1252


Here's the Coote:

alumsanddisc.jpg


For more info: http://www.cootebeltgrinder.com/accessories.html

Don't know if that helps but it might give ya some ideas...




~Paul
My Youtube Channel
... (It's been a few years since my last upload)
 
Last edited:
Thanks guys. So in theory i can get a rod and blocks like ones sold at kmg. One end in the drive wheel, the other in the disc and it SHOULD work. I may just try this.
 
The big advantage if you are on a budget is that you get to use a motor and vfd that you already have. Just keep safety issues in mind as you don’t want fingers or blades getting caught between belts and wheels!
 
Yeah thats exactly my thinking. For all the parts through Beaumont metal works its only 150 bucks that's including the reverse switch. So after i get some funds i may do this. File guide is #1 on my priority list thougj
 
On your grinder I would do it the way Jonathans posted. You'll need a tool arm, two pillow blocks, a plate to mount them to the tool arm, a drive wheel like any 2x72 drive wheel (OBM fiber works), a keyed 5/8" shaft and a disc.

Then you'll need to figure out a work rest but you can probably use the other tool arm for that.
 
I added one to my KMG after a shop visit to Bing’s. Another great idea I got from him...

Anyhow-my motor is mounted under my bench and I had a belt running up through a hole I’d cut in the bench top. I took off the drive shaft for the grinder and bought a longer one to use for this project. My grinder sits on the left end of my bench, so it worked well to have the disc off to the left, over the end of the bench. I got a pillow block and used that to help support the shaft and a buddy helped me match up the new drive shaft to hold the disc I bought. I ordered and put in the reverse switch for my VFD and now I have a disc sander that I can use with the same motor and VFD. It’s pretty great. Whenever I use it, the 2x72 belt is off.

Jeremy
 
valknut said:
Yeah thats exactly my thinking. For all the parts through Beaumont metal works its only 150 bucks that's including the reverse switch. So after i get some funds i may do this. File guide is #1 on my priority list thougj
Click to expand...
You just complicated simple thing ....... buy when you can ! REAL disk sander with rest tool and L/R switch :thumbsup:
 
valknut said:
Thanks guys. So in theory i can get a rod and blocks like ones sold at kmg. One end in the drive wheel, the other in the disc and it SHOULD work. I may just try this.
Click to expand...

Not sure what parts you’re talking about on Beaumont’s page, but I’d like to know. I don’t have a disc sander, other than on an old craftsman 2x42. If you could put up a parrots list and where you got them I’d definitely appreciate it. Good luck.
 
Mine is certainly a real disc grinder and at least for my shop set up, it’s not in the way nor does it cause any issues. The only potential “problem” for me with the placement is a wall to my left as I’m using the disc. If I had something long, I could run my elbow into the wall. If I remember right, Bing’s set up had the disc on the same side as the drive wheel for the 2x72-off to the right as you’re standing in front of the grinder. He had the Nielsen multi-disc system on his.

I got the longer shaft I think from MSC, can’t remember where I got the pillow block and VFD switch. I may have ordered the aluminum disc from Beaumont... I made a table to use with it if I want, but I don’t think I’d have a problem buying a separate table and fabricating up a way to attach things if I really needed. I just rarely use a table on it. If your shop layout works and you don’t have the funds for another motor and VFD, this is a great option. Just my $.02.


Jeremy
 
kuraki kuraki why do you think that way is better? Just curious
Natlek yeah i kniw its "easier" to just go buy one but on a military disability paycheck i dint have those Kind of funds.
JG heres what im thinking right now:

VFD forward/reverse kit
5/8 precision drive shaft
5/8 pillow block (idk if i need 1 or 2. Probably 2)
9in bevel disc

Idk if im allowed to put prices so i left those out for now.
In my non machinist mind im thinking it should work
Motor-> drive wheel-->12in shaft--> pillow blocks(set in middle of said shaft) -> 9in disc
Ill have it so the disc is hanging off the table so there's no clearance issues.
Only issue i see is belt changes are gonna be 1 second longer
 
I guess because I would prefer to put the disc tool arm on every time I wanted to use it, over looping a belt around a permanently mounted disc every belt change. Also to utilize the second tool arm for a disc work rest rather than building one on your table.

Either way will work.
 
I can totally understand the annoyance of having to loop belts over the disc. Fortunately that’s not a worry for me since my disc is on the other end of things. A dedicated disc grinder would be I think the “best” option if a guy has it. One problem for me that this helped with was also my limited space. Trying to fit all my crap in my garage is sort of like playing a really messy game of Tetris. So for me, the cost savings as well as some of the space savings made it well worth it to gain the tool.

Jeremy
 
I would skip what you are planning, buy a forward/reverse switch, add a 1 or 1.5hp footed 56c motor with a 9” disc and add a on-off-on switch to switch between your 2x72 and the disc. The difference in cost between pillow bearings and a shaft vs a surplus motor is not enough to warrant the extra work. I know you are on a budget. This should be an affordable step up and give you more versatility.
 
Ive thought about that too but seems the wiring if a nrw motor plus a switch seemed more of a PIA than putting a shaft and pillow blocks together
 
Wiring a switch is easy. I wired my switch to an outlet i mounted on the side of the VFD instead of hard wiring my 9” disc. I have a second 2”x72” that I switch out for the disc. I can plug any 3 phase 1.5/2hp equipment into my VFD so I now run three machines off of one VFD.
 
Brian Ayres said:
Wiring a switch is easy. I wired my switch to an outlet i mounted on the side of the VFD instead of hard wiring my 9” disc. I have a second 2”x72” that I switch out for the disc. I can plug any 3 phase 1.5/2hp equipment into my VFD so I now run three machines off of one VFD.
Click to expand...

See to me that sounds like a huge PIA. Im not good with electronics at all unless theres a video that breaks it down barney style.
 
You must log in or register to reply here.
Back
Top