What a difference! I used this jig to sharpen the chain on my 18" Craftsman chain saw. Yesterday, it was burning its way through wood; today, it cuts like butter. This saw has never cut this well, even when the chain was factory fresh. I had even purchased a new Oregon chain, which also did not cut as well.
Easy to use - but be aware that you have to buy the correct round files for you chain, and also a flat file for filling the blade guides. This kit has the file handle, so you only need the files, which run about $7 for two. You just clamp it to the rivets of the chain and to the bar, set the depth, and then file. The only tricky part is setting the depth - just make sure you are not bottoming the file out below the cutter and you are golden. After filing a few cutters, you'll get the hang of it. Doesn't hurt to have a backup chain, however - first sharpen the one that cuts the worst, and by the time you get to your "good" chain, you will be an expert.
I don't do a lot of cutting, and thought I could avoid the whole chain saw sharpening Zen, but you really have to learn it, as the blade goes dull after only an hour or so of cutting. So if you want to use a chain saw, you really do have to learn how to sharpen the chain yourself, or purchase several chains and find a good sharpening shop. If you have your chains shop-sharpened, however, you won't be able to touch them up in the field, due to differences in the sharpening grinders used in professional shops.
Once you set the correct angles with this jig, you can touch up the chain easily by hand, using the same file.
Don't file too much - it is easy to file away half of your cutter if you are not careful. Just a few strokes (3-5) will do it.
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