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How the serrators cut - First, serrations are made up of peaks and valleys but since it's only the peaks that touch the comm (if the valley touches the comm, there are no serrations left) this is what we concern ourselves with.
Second, I'm listing the serrations on the different cutters and brushes by the number of serrations per inch measured from peak-to-peak.
Also, I found that the "stack" of serrations on a brush can start in a peak or a valley The only brushes I found that start with the peaks were the T#4500's and the T#4455. Nothing strange there-they are the same compound. The only difference is the standup vs. laydown comfiguration. The number of serrations per inch indicate how "fine" or "coarse" the serrations are but not how many are necessarily on each brush.
Since the dictionarys don't list the word "Serrater" we can make history here. Do we spell the tool that makes serrations a "Serrater" or "Serrator" . I'm not an English teacher but I say "Serrator", just looks better. If anyone out there knows any contradictory rule in English that says it would be proper to spell it the other way, let me know.
So whipping out a magnifier and a steel machinist scale I did some measuring. Here are the results.
The main point of the serrations is to transfer power to the comm without the extra "drag" from the extra surface area. The brush with serrations has a faster "brake-in time" and also does not require as heavy a spring to do the same job, as a full brush. So, it is easier on the comm, but still produces the same or better results. Also, as a bonus, it produces more RPM's, because of less drag (friction).
Last edited by glgraphix; 05-26-2007 at 11:25 AM..