Introduction: Diamond Grit Pedestal Grinder for 12$

Picture of Diamond Grit Pedestal Grinder for 12$

How to add an inexpensive diamond grinding element to your existing pedestal grinder.
- I use it for sharpening tungsten for TIG welding, but it's also good for sharpening lathe bits and drill bits.

Step 1: What You'll Need

Picture of What You'll Need

* You must have a pedestal, or bench grinder which receives at least a 4 inch grinding stone or wheel.
* Go to Harbor Fright ;) and get the replacement blade for their Chainsaw sharpener for 10$ US.
* While your there, in the same section, get the 2$ pack of Saw Blade Bushings so we can match the arbor to the blade.
* Last, you need a 2 crescent wrenchs, and a screw driver with a Phillips head

Step 2: Take It All Apart

Picture of Take It All Apart

* Unplug your grinder
* Decide which side of the grinder you want open, and to have the diamond blade on it.
* Take off the side plate, to expose the grinding stone.
* You will need to wedge something in between the stone and the housing, while you loosen this nut with a wrench. ( I used the handle of a second wrench)

Step 3: Adapt

Picture of Adapt

* Figure out the size of the shaft.
-This one is 1/2 inch
- The hole in the center of the diamond wheel is about 3/4", and will not sit well on this arbor.
* I used 2 of the Reduction Bushings to make this hole smaller, and more closely fit the 1/2 inch shaft of my grinder.
*First I used the 3/4 to 5/8 bushing, then inside that I used the 5/8 to 1/2 bushing.
* place them all on top of the existing stone, over the shaft. (pic 2 & 3)

Step 4: Center the Blade

Picture of Center the Blade

* Now we need to try to center this blade.
- my grinding stone is 6 inches around +or-, and the Diamond blade is 4 inches at its outside diameter.
* I took a Combination square blade and made a few marks at about 3/4 with a paint marker to use as a guide.
I just held the ruler on the guard at 3/4 then pulled back a bit for the thickness of the marker, and away from the stone so's not to grind the ruler, and turned the stone by hand making marks every inch or so.

Step 5: Tighten Up

Picture of Tighten Up

* Hold the Diamond blade inside of your marks, and tighten the nut down by hand, but make sure it holds the blade from falling out of center, and the washer is flipped so it puts pressure on the bushings. (pic 2)

Step 6: Nuts

Picture of Nuts

* Finally, wedge something into the grinding wheel again, and Tighten the nut down with a wrench.

Step 7: Stand Back and Test It

Stand back... and turn it on!
- watch to see how centered the blade is, and if it's too far out, you could make the adjustment.
- The better centered it is, the less vibration it will make, and safer it will run.

⏰ Running and using the grinder without the cover is not as safe as with the cover plate on, so be extra careful.
If you get a finger caught in there, you probably won't get it back.

This was my first solution to making a tungsten grinder for TIG welding. Later I mounted a Dremel with a diamond blade thru my welding table. ( see my other Instructable)
I use either one depending on its closeness to me!

Tanks and Bombs!

Comments

jacko622 (author)2016-12-26

Just FYI, it's Harbor Freight's item 98862, " Replacement Wheels for the
120 Volt Circular Saw Blade Sharpener".

MrMetal (author)2016-10-04

Neat idea and good explanation. I would caution, however, that the cupped washers on either side of the grind wheel need to be one third of the wheel diameter and equal in size. The reason is to keep the clamping forces on both sides of the wheel in line with each other. Tightening the nut with unequal washers puts undue stress on the wheel and could break it

You could keep the centering bushings in place by placing a couple flat washers with 1/2 inch I.D. on the spindle before putting the cupped washer in place to fill up that space. Just make sure that the cupped washer presses against the wheel and not the flat washers.when the nut is tightened.

steelshell fab (author)MrMetal2016-10-04

Thanx Mr. Metal! sometimes the full solution is just outside. I wasn't sure how to get pressure on both area's.
This would solve both problems.
I'll add a step to this next time I'm in the shop.

mrceeky (author)2016-10-03

Very nice constructable which is quick and very inexpensive to make. Great for sharpening lathe tools and drill bits.

Modern Rustic Workshop (author)2016-10-02

Neat, and I like the resourcefulness of using harbor freight items which don't usually go work a bench grinder.

BeachsideHank (author)2016-10-01

I can see this being useful for sharpening brazed tip metal lathe tool bits, nice post. ☺

I just used it to sharpen a drill bit! it's a nicer sharpen with fine grit, and the grit last a lot longer!

About This Instructable

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Bio: Owner, Operator of Steelshell Fabrication
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