Dear BobL and co, a question on raker angles.
- Thread starter KiwiBro
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Jimmy in NC
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Length determined the width available for that cutter to cut. Differing lengths would be less than desire able.
On crosscut (and most other saws) one of the key steps in sharpening is 'jointing' the teeth: making sure that they are all the same height (or in an intentional arc) so that they follow each other in the cut.
Another key step is 'setting': which provides clearance, and makes sure that they are all cutting the same width kerf.
With modern chainsaw teeth, joining and setting are 'automatically' controlled by the length of the cutters, due to their trapezoidal shape. This was one of the claims in Joe Cox's original patent.
So if your cutters are all different lengths, your chain will jump around, not all of your cutters will participate equally, and you will get a rougher cut.
Philbert
Another key step is 'setting': which provides clearance, and makes sure that they are all cutting the same width kerf.
With modern chainsaw teeth, joining and setting are 'automatically' controlled by the length of the cutters, due to their trapezoidal shape. This was one of the claims in Joe Cox's original patent.
So if your cutters are all different lengths, your chain will jump around, not all of your cutters will participate equally, and you will get a rougher cut.
Philbert
It depends on what you mean by all "over the show".
Cutter length affects cutter height.
Higher cutters will tend to grab more wood and grab more often than other cutters.
Remember the chain porpoises in the cut so only about 1/3rd of cutters do most of the cutting in any one pass, so lower cutters will still cut but not as much or as often.
If most of your longest/highest cutters are either all left side or all right side, then the bar will move in that direction which means rising or diving in the cut - not good and should be fixed
If the longest/highest cutters are randomly scattered around the chain it won't matter.
Longest/highest cutters wear more so will show more glint so if you touch up to remove glint you will naturally remove more metal from the longest cutter.
I stopped measuring cutter lengths about 3 years ago but if a cutter looks a bit longer than others I will give it a couple of extra swipes.
AT sawyer
ArboristSite Operative
Find your shortest tooth and sharpen it. Make a length gauge from a stop nut and bolt and fit it to your short tooth (drilling out a little of the stop nut's plastic sleeve will let you finger tighten this jig). Sharpen all other teeth to the same gauged length. Chain will run smoothly. Obviously if you have one really bad tooth/short tooth, skip it and joint to the next longer one to preserve chain life.
It is like filing a crosscut saw, but without the swaged rakers.
It is like filing a crosscut saw, but without the swaged rakers.
macstrange
ArboristSite Operative
Great idea!!!! I like to think I have a pretty good eye, but this little jig would sure come in handy.Find your shortest tooth and sharpen it. Make a length gauge from a stop nut and bolt and fit it to your short tooth (drilling out a little of the stop nut's plastic sleeve will let you finger tighten this jig). Sharpen all other teeth to the same gauged length. Chain will run smoothly. Obviously if you have one really bad tooth/short tooth, skip it and joint to the next longer one to preserve chain life.
It is like filing a crosscut saw, but without the swaged rakers.
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