Thread: DP of gears, whats it all mean?
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25-10-2009 #4
Every chance.
One other detail required on gears is to know the pressure angle, PA, the involute [ shape of gear tooth ] is generated at.
Modern gears are cut at 20 degrees, older gears at 14.5.
Bad news is it's really hard to measure a PA in the home shop without specialist equipment.
Good news is most machine tool maker use 14.5 and stick to it because of legacy issues.
Early Colchesters also had 16DP gears at 14.5 PA.
.John S -
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