DIY Bench Grinder to Belt Sander Conversion With Templates
Intro: DIY Bench Grinder to Belt Sander Conversion With Templates
This Instructable will show you how we turned a bench grinder into a belt sander!
You can check out the entire build video on Youtube linked above. (We would also appreciate a like and sharing if you think it's worth it :))
This bench grinder has served us well over the years, but we needed a sanding configuration that allows us to quickly remove more material when working with metal and the stone discs just don’t cut it.
We decided to retrofit this guy instead of buying a proper 2x72 belt sander because 1) 2x72 belt sanders are way out of our budget and 2) we don’t have the shop real estate to accommodate the footprint.
STEP 1: Disassembling the Bench Grinder
In order fit the retrofitted components, we removed the guards and the wheel from one side of the grinder. This process is a little different from grinder to grinder, but just a few phillips bolts to take off the guard and a locking nut to remove the grinding wheel. The locking nut on the shaft is left handed threads so the saying is backwards " righty loosey, lefty tighty"
It doesn't matter which side you choose to retrofit, we wanted to keep the wire wheel and it worked well for our shop.
STEP 2: Templates
We modeled everything on Fusion 360 and printed the sketches to scale, so we can use as templates.
There is a PDF of the templates if you want to try the retrofit your own! The only modification is the mounting hole locations vary from grinder to grinder, so use your old shield to transfer the hole locations.
STEP 3: Cutting Out the Shapes
Using spray adhesive, we stuck the templates onto 3/16” steel plate and roughly cut them out with our angle grinder and cut off wheel as well as our bandsaw for the finer cuts.
STEP 4: Drilling All the Holes
Moving over to the drill press, we drilled out all the mounting holes using a small bit as a pilot, then drilling them to size with a step bit. The remaining material for the slots were removed with the band saw.
We removed the sticky paper and did the final shaping for all the pieces with a flap disc.
STEP 5: Tracking Roller Hinge
To make the mounting bracket for the top pulley, we cut out a small square and drilled a hole in the center. Using a bolt to align the hole from the bracket with the pivot arm and a nut as a spacer in between we welded a make-shift hinge. Just two small tacks on either side is enough.
STEP 6: Dry Fitting All the Pieces
With everything prepped, we can dry fit all the pieces.
The first thing is securing the main body by the three bolts…. Unfortunately I didn’t measure the hole spacing correctly when modeling, so we were off a bit. Using the guard that we removed earlier as a template, we marked where we needed to elongate the holes and filed them out.
STEP 7: Backing Plate and Rest.
After bolting everything up, we cut a few square pieces to use as the backing for the sander as well as the rest. We first aligned the backing and tacked it into place then positioned the rest making sure it's perpendicular to the backing plate and tacked that in place. Once we were happy with the position, we removed it from the assembly and welded them completely.
STEP 8: Final Assembly
After everything cooled down, we sprayed a quick coat of paint and assembled everything onto the bench grinder.
Following the anticipation of turning the grinder on with all the components, we were thoroughly disappointed.
One major item we didn't account for in the beginning was the power of our bench grinder. It was news to us, but our Craftsman is rated at 1/6hp and with all the added rotational mass, it never got up to full speed let along grind anything.
Luckily after searching through Offerup we found someone down the street selling a 1hp grinder with a super heavy duty stand for a steal, so we scooped that up!
STEP 9: Disassembly!
The only modification we had to do was re-drill the mounting holes since the 1hp grinder had a larger hole spacing.. Similar to before, we used the guard as a template to get the correct spacing.
STEP 10: Final Assembly
This time around, we took paid extra attention to the spacing of the pulleys making sure to use extra washers where needed so that they're all on the same plane. We just used a straight edge against the faces of the pulley to check this.
STEP 11: A Functional Belt Sander!
After tightening everything down, we had a functional belt sander!
What a difference a 1hp unit makes, it eats through steel like it's butter.
Thank you for reading our Instructable!
If you liked the project, don't forget to share it. Comments and feedback are always welcome.
You can check out our other projects here on Instructables as well as our Youtube channel IMEE MADE.
33 Comments
Jeffrey1970 3 years ago
dand3d 3 months ago
JosephC93 1 year ago
volvorod 3 years ago
Why build something that cost way more than buying it - and isn't any better?
If you already own a bench-grinder, and have some scrap plywood (or can get it cheap) then this is a nice build. Otherwise - not really.
I can buy this for about 45 USD here in Sweden (Included picture).
With that said - nice build though. 🙂
AND - it's ALWAYS FUN to build stuff! 👍 🙂
Justlearning4now 3 years ago
imee made 3 years ago
Justlearning4now 3 years ago
imee made 3 years ago
BakerBoy7 3 years ago
I did felt that the instruction seemed to miss the assembly of the backing plate and rest plate, (once I saw the downloadable template this made a little more sense but this could be improved). Also not sure why the tracking roller hinge is required.
imee made 3 years ago
The hinge is just a solution to adjust the tracking of the belt. Since the whole assembly can be a little off plane, using a bolt to dial in the pitch of the tracking roller helps keep the belt centered in relation to the pulleys.
kmpres 3 years ago
1. How to make the band move upwards rather than downwards;
2. How to reduce the speed of the motor;
3. How to make the parts without requiring a welder and other exotic tools.
I don't have the budget, nor space for the added tools (welder, angle-grinder, bandsaw, etc.) that I'd need to make your metal one. I figure the first problem can be handled by moving the grinding platform to the rear - essentially assembling the parts in mirror image. The second problem will require a Variable Frequency Drive which can get expensive. The last problem will require the most thought, but I thank you for the inspiration.
rhyspsmith007 3 years ago
kmpres 3 years ago
imee made 3 years ago
1. Yes, assembling in a mirror image would solve the problem - essentially working from the back side of the grinder so the belt direction is upwards.
2. Harbor freight has an inexpensive router speed controller like this: https://amzn.to/3iTVIHz which might work, but I don't have first hand experience with that
3. You can build everything with plywood using the templates provided. Some dimensions may need to be adjusted to account for the added thickness. Another solution would be to mark all the welded joints and ask a local muffler repair shop to weld the pieces for you. I've asked a few shops throughout the years before getting my own welder and most of the time they are more than happy to help if they're not super busy.
Good luck on your build!
solargroovy 3 years ago
kmpres 3 years ago
I bought the Harbor Freight device some years ago but it didn't work at all. Very poor quality control so I don't recommend it. I ended up designing my own circuit and fitting it inside the HF box. Works for incandescent lights and corded electric drills but not much of anything else.
Thanks for the link. Mr. Fielding is very knowledgeable and gives good, clear overviews of motor and speed controller types in his videos.
rhyspsmith007 3 years ago
That said, I have a couple of safety issues.
Please mention that the back plate & tool rest are as close as possible to the belt, as it minimizes deflection & the risk of snatching. Also mention that when using any power tools, clamps are much better than hands at securing the workpiece- I have scars to prove it!
Well done though
robbied 3 years ago
For those looking to build a variable speed one, find a second hand 3 phase motor, and get a cheap VFD from ebay. Any motor from 1.5hp to 3 hp will work.
christhomaskinnell 3 years ago
imee made 3 years ago