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Started this project some time ago. Managed to loose any drawings I made so pretty much starting from scratch with some pieces I'd already built.
My sawmill uses a 1 1/4 wide band saw blade. There are places that sharpen them but having to take them there then go get them would get old real quick. Commercial grinders are available but don't fit my pocket book. So here we go.
I had the grinding head built, used the motor and wheel from a chainsaw sharpener. The case was cut out on the plasma table so there had to be drawings.
The head moves up and down to follow the tooth profile, on a set of bearings at the back.
Made the blade guides this week from some mystery stainless that I had. Machined reasonably well.
The blade will slide between the two side plates. The gap is adjusted with those two brass assemblies, the outer jaw is spring loaded against the adjustment. The back of the blade rides on two sealed bearings.
Need to machine a little off the top of the guides to get to the bottom of the gullet.
A 12volt gear head motor will advance the blade and that aluminum disk will be a cam to raise and lower the grinding head as it follows the tooth profile.
The pivoting arm will connect the two via an adjustable link to the head. The adjustment will set how much is ground.
Still working out how to determine the shape of the cam. Present thought is to make a dummy grinding wheel that can rest on the blade. As I advance the blade just mark the rollers position on the cam, then machine to the marks. I made the follower arm with a 3 to 1 advantage to make the cam less sensitive. The teeth are only about 1/4 deep so the cam will have a 3/4 inch lobe. Will see how it goes.
Thanks for watching
Greg
My sawmill uses a 1 1/4 wide band saw blade. There are places that sharpen them but having to take them there then go get them would get old real quick. Commercial grinders are available but don't fit my pocket book. So here we go.
I had the grinding head built, used the motor and wheel from a chainsaw sharpener. The case was cut out on the plasma table so there had to be drawings.
The head moves up and down to follow the tooth profile, on a set of bearings at the back.
Made the blade guides this week from some mystery stainless that I had. Machined reasonably well.
The blade will slide between the two side plates. The gap is adjusted with those two brass assemblies, the outer jaw is spring loaded against the adjustment. The back of the blade rides on two sealed bearings.
Need to machine a little off the top of the guides to get to the bottom of the gullet.
A 12volt gear head motor will advance the blade and that aluminum disk will be a cam to raise and lower the grinding head as it follows the tooth profile.
The pivoting arm will connect the two via an adjustable link to the head. The adjustment will set how much is ground.
Still working out how to determine the shape of the cam. Present thought is to make a dummy grinding wheel that can rest on the blade. As I advance the blade just mark the rollers position on the cam, then machine to the marks. I made the follower arm with a 3 to 1 advantage to make the cam less sensitive. The teeth are only about 1/4 deep so the cam will have a 3/4 inch lobe. Will see how it goes.
Thanks for watching
Greg