Sharpening pencil tip to tri-cut

I'm heading out now but the quick answer is to take some 1/8'' aluminum plate and make a triangle with a hole in the center for a grind jig to set on a bench grinder table.

Cheers, Don

I heard that before and don't understand it. How do you stop the shaft from turning inside the jig?

I would love to learn how to do this evenly!

Quote from Dan

I heard that before and don't understand it. How do you stop the shaft from turning inside the jig?

Dan, It's really simple actually. Same concept as your cross hole drill jig that you sale. That one is based on 90 degree angles. Now we need to think 60 degree. There are many ways to do it, methods based on the tool box that one has.

Modifying the Gatku head , I would recommend that he calls them up, they spent a huge amount of time designing the performance of that tip, thusly the high cost. You might have a different issue to correct.

I could add a TRICUT to the head in a minute or so, if you decide you want to go that way, pay the [ To and Fro cost ] for shipping and I can do it.

Here is a picture of some tricut on some of my heads. This diver wanted these so he can sharpen them easier in a bouncing boat with a stone and file. He also wanted multiple heads so the deckhand could clip them on and off fast as he waits in the water for his pole.

Quote from Linghunt

Dan, It's really simple actually. Same concept as your cross hole drill jig that you sale. That one is based on 90 degree angles. Now we need to think 60 degree. There are many ways to do it, methods based on the tool box that one has.

Can you get any more vague?

Quote from Dan

Can you get any more vague?

Your Jig. You clamp spearshaft and drill a hole for the flopper pin at 90 degree angle to the drill press table. You use a set screw to hold the spear shaft.

Your drill jig is a rectangle or square, that means the corners are at 90 degrees.

Ok, now lets talk the Tricut point. All the way about a circle is 360 degrees , Divide by 3 sides for tricut so you have 120 degrees for each side as you go around the shaft.

The angle of the tricuts from surface to surface is 60 degrees. Looking down the shaft you see a triangle, a triangle has 180 degrees adding up all 3 angles. All 3 angles are the same so we got special triangle where all angles are equal and same for the sides.

If your jig was set at 60 degrees vs 90 degrees you are headed in right direction. You could also think about 30 degrees for 60 + 30 = 90.

Another special triangle in geometry is a 30-60-90 for angles. Take the 60-60-60 triangle and cut it in half to get this one.

120 + 60 = 180 , half of the 360.

If you wanted a QUADCUT point. Angles would be 90 degrees. a four sided jig like yours would work.

Hopefully this adds clarity.

I do it manually with a hand file. Actually, all my tips eventually become tri-cut. You don't have to go from 100% pencil tip to 100% tri-cut. Just sharpen the very tip tri-cut and you will have much more penetration.

Quote from Marco

I do it manually with a hand file. Actually, all my tips eventually become tri-cut. You don't have to go from 100% pencil tip to 100% tri-cut. Just sharpen the very tip tri-cut and you will have much more penetration.

You will get more life out of the tip as well.

Sorry to go off subject, but Marco your new avatar! ???

Thanks for the explanation John, but I don't get it. I need to see how it's done.

Saw on Instagram that gatku is making tri cut tips now, I'd contact them. Glad to see another pole spearo on the board!

Quote from matt hudson

Saw on Instagram that gatku is making tri cut tips now, I'd contact them. Glad to see another pole spearo on the board!

Matt, Linghunt makes the best polespears you can buy. Yes they are custom, and yes it takes a longggg time to get one once you make the waiting list for his poles, but what a pole! His tips ain't to shabby either.

I told you George... I told you. :rolleyes1:

Picture worth a 1000 words. This will be more clear than my ramble on angles and basis geometry.

The pink lines is a cross sectional slice of the tip along the Axis.

Quote from matt hudson

Saw on Instagram that gatku is making tri cut tips now, I'd contact them. Glad to see another pole spearo on the board!

I don't think he wanted to buy another tip for $60 + .

Marco method of a hand file and hitting the 60 degrees would be easier and cheapest approach.

George's pole set up took longer than most for it was a special pole designed for his specific needs and wants. I'm better now for my 4 standard pole configurations.

Custom Motorcycle part's for Perth Australia is the weekend agenda. The Bikes this guy makes are amazing, I could post a picture but that's way off topic.

Quote from Grouper

Appreciate all the info guys! I think I'll try the hand file technique Marco talked about since it's simpler AND my toolbox isn't quite up to par for making precise cuts I don't think. Linghunt your picture definitely helped after i tried to bring back my geometry skills with the perfect triangles lol :crazy:

Pictures are much better for geometry, My description was confusing without a diagram.

Yep Marco is the man for simple effective solutions.

I just got home and I'm beat, I'll put up a jig pic Sat.

Cheers, Don