Tooth de-setter

tawilson · July 30, 2023, 12:07:16 PM

While you're at it invent one that mounts to a bench beside my sharpener so it desetts just before it gets pulled through. I've made a couple feeble attempts at it and will gladly pay. Lol.

fluidpowerpro · July 30, 2023, 12:21:07 PM

What has been the challenge?
Does the sharpener have enough power to also pull the blade through the de-setter?
Also, I have found it works better to push the blade through my de-setter, not pull it.

Crossroads · July 30, 2023, 12:29:47 PM

Any thoughts on why it would work better pushing instead of pulling? It seems like the opposite would be true because there would be no side to side deflection when pulling.

fluidpowerpro · July 30, 2023, 12:41:43 PM

It seems that the blade wants to ride up a little if I pull it. When I push, it stays down. I'm thinking if I build more, using larger diameter ball bearings would help. Currently they are 1 3/8" diameter.

tawilson · July 30, 2023, 04:46:10 PM

The advance mechanism pushes downward so I don't think it would be a problem with the blade riding up.

terrifictimbersllc · July 30, 2023, 04:53:13 PM

The blade moving up or down depends on roller tilt.

fluidpowerpro · July 30, 2023, 05:03:11 PM

My rollers are parallel with no tilt. Just to see if my theory is correct, I already ordered some larger diameter bearings to modify with and try out.

Ljohnsaw · July 30, 2023, 06:07:26 PM

So I just manually pull mine through. If it starts riding up, I tip it up which pulls it down as it enters. Picture it, it seems backwards but it works.

fluidpowerpro · July 30, 2023, 06:21:33 PM

I'll try it.

fluidpowerpro · July 30, 2023, 06:30:28 PM

Terrific, considering what LJ said, did you mean tilted towards the entering blade? When you said tilted. I was thinking in relation to each other.

Ljohnsaw · July 30, 2023, 07:20:26 PM

So as the blade is passing from left to right, the right side is up just a tad higher. The entering side is a little lower and continues to want to go lower as it passes by.

If it doesn't go quick enough, I sometimes reverse the tilt and direction for a few inches and resume.

fluidpowerpro · July 30, 2023, 08:12:15 PM

So that would mean if the rollers are tilted slightly towards the entering side, that would be the same? Correct?

Crossroads · July 30, 2023, 10:35:45 PM

Try rotating the tool 180° and see if the blade still wants to climb

Dan R · July 31, 2023, 12:53:24 AM

When I set a blade before sharpening if the dial indicator shows more than the desired amount I simply bend the single tooth back and then reset that tooth. Can't take credit for that way saw it on YouTube Mr Robert in Mississippi if I remember correctly
Dan

Ljohnsaw · July 31, 2023, 01:47:57 AM

Quote from: fluidpowerpro on July 30, 2023, 08:12:15 PM
So that would mean if the rollers are tilted slightly towards the entering side, that would be the same? Correct?

I suppose. Seems easier to put things on straight and plumb than some precise but very small angle.

Chuck White · July 31, 2023, 08:54:35 AM

My desetter is set up so that when I pull a blade through it, I pull with my left hand and my right hand raising or lowering the blade will determine if the blade stays down in the rollers or rises!

Lowering or raising the right hand determines what happens at the rollers!

Pulling the blade, you'll have more control of the blade than pushing, and pushing the blade can cause you to kink or break the blade or get yourself cut!

terrifictimbersllc · July 31, 2023, 10:26:24 AM

Quote from: fluidpowerpro on July 30, 2023, 06:30:28 PM
Terrific, considering what LJ said, did you mean tilted towards the entering blade? When you said tilted. I was thinking in relation to each other.

Tilting, as in The bolts that the bearing are mounted on, are not exactly at 90° or maybe that under the forces operating, that the bearings are not quite parallel to the blade being pulled through. Tilt, also as in raising the blade up or down, while pulling it through, as has been suggested above, or as crossroads, suggested, turning it around and pulling it through the other way and seeing then that the blade wants to move down. If one does want to use the setter in the opposite direction, it might be necessary to invert the blade, so that one can continue to pull it through the teeth pointing backwards.
I was not suggesting fabricating a setter With adjustable angle or drilling the holes for the bolts that the bearing bolts are on at an angle. I was just pointing out that bearing/roller tilt can determine whether the blade wants to move up or down as it goes through the rollers. I agree that you have to adjust your pull so that the blade wants to stay between the rollers, that you need to be pulling, rather than pushing, and that you had better have gloves on.
Also, I don't think that the motor or pusher on the BMT 200/250 are robust enough to stand up very long to the force needed to de set teeth, by pulling rhe blade through one of these desetters mounted in-line. At least not on .055 blades.

fluidpowerpro · July 31, 2023, 01:09:43 PM

You guys were right. Just a little tilt of the blade and I can pull it through.
Thanks!

Cedarman · August 01, 2023, 06:38:03 AM

To see if the desetter will bring a wayward tooth back with the rest try bending a couple teeth about 5 to 8 thousandths out. Then pull through the desetter and see if the set on those teeth match the normal teeth. You could do this with an old broken blade and try different amounts of overset.
I've had an old WM desetter for many years. Rarely use it. Like to use my hand setter with the dial to check the set in my blades before sharpening.

fluidpowerpro · August 01, 2023, 12:09:14 PM

Ok, I tried what you suggested. I used a piece of broken blade and bent one tooth so it was way overset. I then put it in the de-setter, snugged up the rollers and passed it through 1 time.

I didn't measure. As a visual, I used a small machinist square held up to the blade. In the one picture you can see that it's overset.
In the other picture you can see that the tooth has been bent back.
Sorry, I know the pictures are at slightly different angles. It's hard to hold the phone and square at the same time. Either way, I think you can still see the difference.

I know using the square is not precise, but I have found this method to work well to spot irregular teeth.
I think as a rule of thumb, the set should be about 1/2 the blade thickness, so if you hold the square right, I can gauge the set to see if it's about 1/2 the material thickness.

* I would welcome any comments about using this method.