Sharpening Bandsaw Blades - What works for me
Rob-Would, could you give some detail on your band saw blade sharpening method using the diamond hone in a Dremel tool. Is there a reasonable method for adjusting the set?
Hi Wayne !
I just saw your request for more info about blade sharpening.
I can tell you what I do that works for me....I don't know how this method would adapt to sharpening blades of different manufacturers, but the same method would likely be acceptable.
First, the blades I use most in my two bandsaws (both saws are 14" w/risers; one an old Delta metal/wood saw [28-300], and the other a reconditioned Jet [JBS-14MW]) are the "Woodturner" blades from Highland Woodworking. These blades are 3/8" - 3 tpi with some set. Sharpening takes place while the blade is still in the saw and under tension; unplug the saw to be sure it can't start accidentally. I also use a leather glove on my left hand to move and hold the blade during the sharpening procedure.
The sharpening equipment I use includes a corded Dremel tool (variable speed) fitted with a 5/32" diameter diamond chain saw sharpening stone "burr"; obtained from Lee Valley - item number 77J81.11; $6 for a set of 3). The rotary tool is set to run at about half-speed while I am sharpening. At first, I built a small cradle for holding the Dremel tool in a horizontal position that was able to slide on the table surface so that the grinding stone was kept at about 1.25" above the band saw table. I now "free hand" hold the Dremel which seems to go faster for me than when I had the tool in the jig.
For indexing the sharpening angle, I place a piece of 2" wide masking tape on the table/throatplate and mark lines from the blade that are about 30 degrees off the bade on each side to serve as reference marks to position the stone along those axes.
I first mark a "start-stop" stripe on the blade with a black Sharpie marker to establish beginning and ending points for sharpening. Holding the blade with my gloved left hand, I place the spinning diamond stone into the gullet of the tooth to be sharpened, and touch-up the inside curved portion of the cutting edge of the tooth for 1-2 seconds, maintaining the approx. 30 degree angle. I first sharpen all teeth with the same side set (skipping opposite set teeth as necessary) since it is easier to hold the Dremel in one position and just advance the blade until you've gone around the blade once on that side. Then switch to the other 30 degree line, and sharpen the opposite set teeth going all the way around on that side. The amount of time it now takes me to sharpen the approx. 315 teeth on a 105" blade is typically about 15 minutes. When the blade performance shows signs of dropping off, a quick touch-up brings the blade "back to life". I've been doing this for over 4 years without much problem. I think it's cut my blade costs to about half along with repairing broken blades*.
Given that the Highland Woodworking Woodturner blades already have some set, I have never tried to adjust or modify the set of a bandsaw blade. To do this, I assume some adjustable jig would have to be built, and would need to be done off the saw to provide consistent results from tooth to tooth, and to allow it to be done in both directions.
Some of my friends say my doing all this is just evidence that I'm "cheap"..... given the cost of blades, multiple sharpenings stretches the life of the blades quite a bit, allows them to continue to perform well, and saves money overall.
*If blades break in use (and are not twisted) I braze them back together with silver solder, and get even more life out of them; I usually do this in groups of 2 or 3 broken blades at a time, saved up over period of many months so I can repair them as a batch at one time when I set-up the blade repair jig. ( Maybe I AM cheap ? ? )
I hope this helps! Let me know if you need any further explanation....
Rob Wallace