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[4] Avoid unscrewing the bolt completely, or else it could fall off or be difficult to reinstall
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The table in Illustration 26 lists the v'w value for different wheel specifications and whether the process is roughing or finishing Illustration 26: Dressing intervals based on the specific chip volume v'w For spur gears, the formula for v'w is as follows: Whereas ae = total radial infeed (mm) v'w = removed material per mm wheel (mm3/mm) zb = face width of gear (height of gear) (mm) z = number of teeth ground until dressing cycle (number) For the v'w of helical gears, the helix angle β has to be considered together with the face width to calculate the total length of the grinding gap: Whereas ae = total radial infeed (mm) β = helix angle of gear tooth v'w = removed material volume per mm wheel width (mm3/mm) zb = face width of gear (mm) z = Number of teeth ground until next dressing cycle (Number) Example: dressing after several tooth gaps z for a spur gear ae = 0.15 mm v’w = 3,000 mm3/mm zb = 371 mm (face width) After rounding off, in the above case, one would grind fifty-three tooth gaps and start a new dressing cycle
