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Hardened tooth, damaged tooth gets tuffer and file won't bite and bounce above tooth surface. That will damage cutters on file. You easily see it on file without magnifying and feel it. A file that go easy is not working right.

I tried that chalk thing. I don't like it. it fills up the gullets of the file were I want metal. To prevent them to get dirty fast I dry of the crap on a cloth after each tooth. One stroke to clean cutter, rotate file 1/3 and file tooth, out with cloth, repeat. Lift file on back stroke. I use a...

Most I meet that have a hard time getting the chain sharp as they don't take time to fully understand the shapes and sharpness needed. Their interest in filing is limited to if it cuts or not. Its all about goals and limits, when are you satisfied? I am never satisfied. I want to keep learning...

I can see its handy for harvesters with lots of poser to pull chain. But for saws a good hand filed chain is the best. I hand file harvester chains too.

Willard. I remember you telling us about a test you made of saw chain that was before Oregon sold it was it 73LP or LG? I think it was a chisel chain...

You Know the history of these brands. Partner Jonsered and Husqvarna is the same after 1979. The teams merged and got assigned projects in all brands within Elux. Pissed many off pretty good. The partner guy that did the first attempt of this system and cracked the Ideas was later on Jonsered...

If you look in profile of a chain it is a bit like: ( If it is more like: C You get a beek that dull fast. The more flat it is like ( or even I the sharper edge is needed to be and the longer it will hold edge. A thin edge is not the same as a sharp one.

Angles is less important than edge. If it is not sharp it will not cut anyway... Once it is sharp angles you choose will help you keep the edge.

When I file for hard wood and use Oregon 73LPX chain I file with 20 instead of 25. I have file with 5,5mm file and a tad higher in tooth and file parallel to op plate. It gives a bit less hook and a more durable corner. Same with 21LPX If i use 21BPX I file with 25 as rek and 10 as rek. but hold...

There is a big difference in a cut surface and one from grinding. It is not comparable as it is very different. You can file a metal surface so even that they stick together. You can grind/sand it, but it is takes more time and effort in several steps and mistakes are easily made. In Husqvarna...

I have Disston saws.. Some of then did use 3/4 chain, but I doubt they were used in 1980. The 100 I don't know pitch but it looks like the KB6. It has 9/16 I think. I had a DA-211 with 3/4 inch Oregon chisel chain from '55 something.

I understand the confusion in terms. I got hung up on the pitch rather than type of cutter. I can't think of 3/4 chain on any one man saw. Not even listed as option. There was on two man saws, I have it on some, but not on any of the one man saws. Could it be another pitch like 3/8 ,404 7/16...

Perhaps you mean 3/8 chain? Chisel chain has 90 degree angle on side plate with a sharp corner. Semi chisel somewhat rounded a bit more tolerant to crap and filing angles. also preferred when limbing as it will not grab when pulled along trunk of tree. Chipper is very round and hard to find...

But what saws did they run to feed the 3/4 chain? Semi or not it still wants 30hp or so to function properly. It is mostly used on mashines were the hydraulic engins are way beond that. Any chance I could get a pic of that air injection system? It was a former Partner Engineer that got cred for...

3/4 chain on a saw?

Sounds like every sales pitch I heard for grinders in general over the years. Get a grinder and your worries go away. It is just as much knowledge needed to run a grinder as it is to use a file. If it is square grinder or not it is still a machine and still a disc that grinds, same metal...

This is not going to get better. The more I try test and learn, the more I see how little I have known in past when I was working with saws. I also get reminded frequently I have a lot to learn yet and there is no limit to how good it can be.

Well, lets put it this way.. What if you could save 50% of the costs of bars/chains/rim's the saw, would that be interesting? Many go out of their way to get a bit cheaper purchase price or save a dollar/gallon on bar oil so to me it is very surprising nor more is interested in getting it...

abrasion: The effect of an abrasive: scratches, removal of surface, etc. http://en.wikipedia.org/wiki/Abrasion That would be more the affect you get from acids or sand paper other grinding tools that is not cutting. No, I don't think that is correct. Slice a sliver sounds more accurate. Cutting...

Filing vertical.