This reveals the "tooth contact pattern". By rubbing a freshly ground blade on an accurately ground test block, the high points will be burnished and can then be seen visually. Each tooth will cut the same as the others, lessening the tendency of one or more of the teeth to fail prematurely. This distributes the spring pressure and cutting load equally and will allow for even wear. The optimum contact pattern is an equal amount of surface contact on all the teeth. How the teeth will contact the teeth of the opposing blade determines how well and for how long a blade will cut. "Tooth contact pattern" refers to the "footprint" of the blade. The scraped 3 1/4" band also has a more efficient grinding rate than a 5" to 6" band on the same diameter disc due to a higher average surface speed and more grit grinding by sitting on a more accurate and solid surface. The more even and equal the tooth contact, the better. A straighter, far less crescent pattern can be more easily achieved. Fatigue has a definite effect on the quality of result when sharpening manually and the shorter stroking distance is a definite plus to lessen errors due to tiredness. You must follow as straight as possible the hollow grinding ridge for a greater distance than on The Shop's 3 1/4" honing band. We do not expect the customer to do our quality control for us.Ī 5" to 6" honing band also makes it more challenging to produce the optimum straight tooth contact pattern. No other manufacturers test their disc surfaces before shipping. We season each disc, sharpen blades on it and then check the tooth contact pattern to be absolutely sure that the disc you receive is accurate and will make good blades immediately. All other systems on the market use an unverified disc surface. introduced a precision machine scraped disc surface that is verified, by the scraping process, a true plane, eliminating this risk. This variance of accuracy has been a contributing factor to the inconsistency in sharpening clipper blades. The showing of high or low spots (uneven wear of the surface) after some use indicates the original inaccuracy (a true surface always wears to an even curve with no high or low spots). The risk with this semi precision plane is that you do not know how good or bad it is. The usual lapping disc honing area is 5" to 6" wide and lathe cut to a semi-precision plane. Sharpened clipper blade is rubbed on test plate with equal and light pressure (about 1 lb.) in a figure eight pattern or back and forth motion.
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