View Full Version : Belt Grinder
11-22-2010, 10:55 PM
Just came across this when looking for other stuff.
YouTube - KMG belt grinder Demo part 1 (http://www.youtube.com/watch?v=BYllaxuzMk0)
I see there's people making there own, like in this link.
Anyone know where to find info about building one of these?
YouTube - Belt Grinder (http://www.youtube.com/watch?v=lRUCHNZMwuQ&feature=related)
11-23-2010, 08:48 AM
That's really cool. I have a couple of old vacuum cleaners that have good motors, was considering something simular. Not sure of the RPM on a vacuum cleaner, but it might be too fast.
For now I just use my Black and Decker belt sander mounted in the vise with the belt facing up (mounted upside down). Works for small parts.
11-23-2010, 12:57 PM
I was looking at those bench top belt sanders when I came across those.
I don't know if a vacuum motor will be enough, looks like most are using 1-2hp motor like on an air compressor, there was one guy that used a bench grinder motor.
The guy in the second link said he'll try to get some info out there but he's been busy.
I'll keep an eye out and if I find anymore info I'll post it.
11-23-2010, 01:18 PM
that thing is a TOOL!!
11-23-2010, 02:04 PM
Knive making websites is where I'd look. I have seen many plans there in the past. ( no links right now)
11-23-2010, 02:05 PM
2"x72" Grinder plans (http://forum.blademag.com/tm.aspx?m=646)
11-23-2010, 03:59 PM
that is a project worth building, a setup like that with interchangeable wheels and platen will allow you do do a lot of different grinding / polishing operations.
11-23-2010, 09:31 PM
Thank you Bradrock, didn't think of looking there.
Pirate, yes it appears to be a multipurpose tool. There was one guy showing how he can swap out belts to grind off rust, then smooth with finer grits, then to a polishing belt to get a nasty looking railroad spike to look like it was chromed.
11-23-2010, 11:55 PM
The belt grinder in the vid appears to be a fairly sophisticated machine for a home-built project. I have used industrial belt machines with serious HP and they are a real treat to carve on steel, wood, whatever. They can also grab your work and launch it high velocity out the door or imbed it in the wall !!!! OOPSSHIT !!!
My friend had a great belt sander in his machine and fab shop. They are a real asset in a welding facility. I had a small 3/4 hp bench machine with a 4 inch wide belt x 5 ft. The opposite end had an 8 inch grinder/buffer wheel. Sometimes I'd install an 8 inch x 1 inch abrasive deburr fiber wheel on that end. Those wheels are a primo item for surfacing metal (but spendy). I recalll that the machine was an Enco item at a reasonable price 20 years ago.
11-24-2010, 07:28 PM
If you don't want to make one and don't want to spend too much, Grizzly has a 2x72 knife maker's belt grinder (http://grizzly.com/products/G1015) for $450. They used to sell reconditioned ones with full warranties on E bay.:dunno:
11-24-2010, 10:18 PM
VD did you look at the second video? On most of the home builts, the most sophisticated looking part are the pulley things that the belt runs on.
Here's another one done cheap.
YouTube - 2" by 72" Homemade Belt Grinder (http://www.youtube.com/watch?v=L8ss_PZDWP0)
YouTube - 2" by 72" Homemade Belt Grinder Part II (http://www.youtube.com/watch?v=_mF0WEeHlxw&feature=related)
11-25-2010, 04:15 AM
Yes, I saw the Grizzley machine in their catalog in my library.
My ancient Enco catalog shows the 3/4hp belt and wheel grinder (8 inch wheel). That was $239.99 back in the day (1995). The 3/4 hp was plenty for a small home shop for gunsmithing, machinery and tooling fab.
Yes, the second vid shows a simpler homebuilt belt grinder. U-tube vids are a hassel for me to down-load on a dial-up into an over-loaded PC. It does take machinery to build other machinery. Welding is also needed.
I have seen kits for homeshop machines like this. Those may have been in the adds in HSM magezne ("Home Shop Machinist" ...)
The beefy beltgrinders create steel "fur" like steel wool which can catch fire and/or short out switches and wiring. Be sure to ventillate the debris so it doesn't get into your machinery, house, etc.
Thanks for the links Coils.
11-25-2010, 08:20 AM
Were I work has a tool like that mounted on a stand that they sharpen Tig torches tungsten electrode mounted in a hand held drill. It works great for the electrodes, but the drills burn up due to the sanded off tungsten getting into the brushes. Lots of uses for one so inclinded, but the belts get expensive when people who abuse the tool tear them up!
11-25-2010, 09:32 PM
I understand what you mean about the "steel fur", I seen one guy suggesting to put a bucket or pan of wtaer under it to catch the filings.
OK, understand the dial-up thing. :D
Never thought to look into the price of belts, have to do that next.
11-26-2010, 01:10 AM
The belts can be spendy depending upon the size and the type of abrasive. My 4x48 belts were about $1.50 each (AlOx) and the silicon carbide or zirconium almost double that price. I believe that those old prices have doubled these days. The trick is to take care of the belts. I always got coarse grit belts which would break down into finer grit. Change out the belts as needed and save the finer grits for later.
Hope you all had a great Thanksgiving Holiday today. I over-turked but had a great get-together with family here in AZ.
11-26-2010, 03:51 AM
The air gets pretty nasty when using one of those.
I use a Kalamazoo Industries 4x36. Motor says its a half horse, but its a baldor half horse which is like a import 1 1/2 horse.
You really want to not just vacuum the dust up while sanding, but also eject the air to outside. If you ever run one for a long time (like 6-8 hours) you get a better idea of how much dust is really coming off of the machine. Its a ton of really nasty burnt metal dust.
If you have a specific need for a belt sander, nothing else will really do.
If all you need to do is sand and deburr parts, a disc sander is the way to go. I usually wound up tearing strips off the belt by getting too aggressive feeding workpieces into it. The disc doesn't care. And despite the difference in working area, the discs seem to last longer, too. And they're much cheaper.
I resisted the disc sander for many years, now I can't see how I did without it.
11-27-2010, 09:35 PM
Those humble 4 or 4.5 inch Harbor Freight disc sanders are a real convienience. Equipped with fiber cut-off type discs they can do many tasks. I have a small adapter stand for mine that serves as a mini chop-saw. The abrasive flap pads are great for grinding down rough metal surfaces to a nice satin smooth finish. The as-cast iron surfaces on a Clausing lathe I'm restoring smooth out very well and thus need little to zero bondo filler.
These grinders handle a different type of work vs the belt sanders/grinders. They are great for detail stuff as opposed to structural fab work or large flats.
11-28-2010, 07:44 PM
Check out this link below. They have a great collection of photos/links/plans for DIY grinder builds. I'll get mine done someday..
11-29-2010, 02:41 AM
Thanks for the link Rocster. Lots of cool belt grinders.
11-29-2010, 10:02 AM
Yes, thank you Rocster