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Re: bandsaw blade question

PostPosted: Thu Nov 01, 2018 6:42 pm
by Bob Francis
Mark Fogleman wrote:A diy Shinto rasp?



I lie this idea!

Re: bandsaw blade question

PostPosted: Fri Nov 02, 2018 1:42 pm
by Alan Carruth
I knew I should have taken a pic right away. I'm kind of busy today and tomorrow, but will see what I can do.

Re: bandsaw blade question

PostPosted: Fri Nov 02, 2018 1:57 pm
by Bryan Bear
Thanks, take your time, I won't be sharpening blades anytime soon.

Re: bandsaw blade question

PostPosted: Sat Nov 03, 2018 5:54 pm
by Alan Carruth
you should know by now that you NEVER say 'take your time' to a luthier!! EVER! You absolutely need it last week, or yesterday at the very latest! 'Take your time'. You'll never get anything from a luthier with that attitude! :P

Re: bandsaw blade question

PostPosted: Sun Nov 04, 2018 1:24 am
by David King
I sharpen my thin kerf bandsaw blades freehand in a bench vise filing straight across with a diamond coated chainsaw file. I use the 1/8" dia but a 9/64" dia would be better. The round file does add a bit more hook to each tooth over time and this hook can grab the wood in a way that will take your breath away, usually with a loud bang. Not really an issue except with very small or short items that you can't get a firm grip on. Filing the 3/4TPI x 105" blades takes me about 20 minutes by hand. My vise holds 5" at a time or about 18 teeth, 4 strokes per tooth, mark the last tooth with a sharpie and slide the blade to do the next 5".

Re: bandsaw blade question

PostPosted: Sun Nov 04, 2018 9:37 am
by Alan Carruth
One of the first jobs I had when I got aboard the ship in the Navy was sharpening a half dozen bandsaw blades by hand off the saw. The big advantage of doing them on the saw is the time saved in not having to demount an remount them. There are round burrs made for Dremel tools and the like for sharpening chain saws that deepen the gullet, but the setup would be a little trickier an they would take a bit more time. Also, I get a lot of blades with hardened teeth that chew up files in a couple of strokes.

Re: bandsaw blade question

PostPosted: Mon Nov 05, 2018 1:33 pm
by Alan Carruth
So here's a picture of the jury-rig in question. The set screw is pulled back out of the way, since this is a 3-4 tooth blade. Note that the holder for the Dremel pivots left and right: it leaves a slight burr on one side of the teeth that tends to pull the saw in one direction, and having it at a very slight angle helps minimize the drift. The original purpose was, of course, for sharpening left-center-right tooth sets, but I've never done that. The little block on the front of the sled originally held a lever that pushed the blade up when the sled was pulled back. It didn't work well and I took it off. It would be pretty straightforward to put in a vertical angle adjustment and some other refinements, but this has worked well enough for a decade and more.

Alan

sawsharp.jpg