When those chisel teeth get rounded over their not going to bite until they have the sharp point again. If it's just couple, no big deal, if a lot of teeth are rounder over you lose a lot of the tooth to get it to saw good. Steve
When the chisel gets rounded over, hand file it at about 10 degrees to removed the damage and get it sharp again. Over the course of the next 4 or 5 sharpening's, it won't get fully sharp to the point, but it will still cut. After the 4 or 5 sharpenings it will be back to the original 25 degrees with a nice sharp point. I've filed by hand for several years and I can do it well, but after trying the Timberline, I'll never go back. The only time I use a hand file now is to touch up a cutter that has been rocked, and I follow my procedure above for that.
I've never purchased the 2in1 file because I set my rakers at different heights depending on the saw. My 024 and 026 are at the stock height of .025", but I on my 036 saws I drop them down to .035" to .040". I use the 024 and 026 for limbing and bucking stuff that's under 6" to 8". The 036 saws are used to fell trees and buck everything else. I run 18" bars with .325 chain on all of them. My 036 saws run a 9 pin rim, and the saws have more than enough power in this configuration, but they do pull HARD into the wood. To me, a full chisel chain doesn't offer much advantage if the rakers are only .025" It's not as grabby so it's nice for limbing, but the whole idea is that it penetrates into the wood a lot easier than a safety chain or semi chisel. In order to realize the benefit, the rakers really need to be dropped at least a little bit so that you're putting the saved power to work.
I run full chisel chain on everything. Full chisel chain needs to be sharp to be appreciated. If hand filing, it's worth giving the cutters 2-3 strokes every time you fill the gas tank. I work by myself and time is important to me. The faster it gest done, the less it wears me out, and the safer I am. I generally sharpen after ever other tank of fuel. I generally cut shagbark hickory that I've skidded from the woods to the pasture so it's got some dirt in it. After a tank of fuel, I can tell a slight difference in performance. After 2 tanks, the difference is noticeable. Not to be disrespectful, but at that point it feels like its' cutting like a safety chain. I haul 2 cords of hickory logs at a time on my equipment trailer and that takes about 2 tanks of fuel to cut a load of logs to length. I buck them into firewood at the house where it takes 3 or 4 more tanks of fuel, but my work shop is only 60 ft away equipped with a work bench, vice, work lights and POWER
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When I used to do everything in the woods, I had the bed of my '93 F250 diesel set up with side rails so that I could stack an entire cord in the bed. I would normally cut and stack the bed full, and then cut an stack at least another cord in the woods so that it was ready for me to load on short notice. I had a mount bolted to my tailgate that would accept the base plate that my 8" bench vice is mounted to in my work shop. The base plate installs with 1/2-13 bolts so a scrench fits them just fine. I ground slots in the heads so that I could screw them most of the way in with a screw driver. Now that I use my equipment trailer, I've welded a couple of 2" receivers onto the tongue. My 13K winch mounts on one. The other one holds a bracket that I welded out of 2" square tube. It has a cheap 6" Harbor Freight vice bolted to the top. Works great for sharpening a saw in the woods if needed.