Pinions

[cmgreen]

Just wondering if any one knows the difference between 64dp and 48dp, i think it means that the teeth are closer together.
But what does this mean to me, and whats best to use?

[bigred5765]

most cars off road anyway,s use 48dp its the tooth pitch you cant use 64dp if ur cars running 48dp without changing the spur gear as well,

[LEGEND]

On a 64dp pinion the teeth are closer and smaller, and have very little give so if you have a bit to much slack between the pinion and spur it has a high chance of breaking but is a little bit smoother, on the other hand, on a 48dp it has more give, perfect for offroad but not quite as smooth.

[Lee]

LEG END, 64 dp will not affect the "smoothness" of the car all it does is allow for finer tuning of ratios. for instance: Pitch Diameter The diameter of the circle on a gear determined by dividing the number of teeth in the gear by the diametral pitch. In parallel shaft gears the pitch diameters can be determined directly from the centre distance and the numbers of teeth by proportionality. Operating Pitch Diameter (Working Pitch Diameter): the diameter of the circle on a gear which is proportional to the gear ratio and the actual centre distance at which the gear pair will operate. A gear does not have an operating pitch diameter until it is meshed with a mating gear. Generating pitch diameter: the pitch diameter at which the gear is generated. In a bevel or hypoid gear, the pitch diameter is understood to be at the outer ends of the teeth unless otherwise specified. Whereas: From Gear Data Mn = normal module pitch (8) DPn = normal diametral pitch (3.175) ß = helix angle (15) z = no. teeth in gear (61) C' = operating centre distance of mesh () z1 = number of teeth in pinion (17) z2 = number of teeth in gear (61) mg = gear ratio (3.588235294) Formula: Pitch Diameter: D' (known -Mn) = (z* Mn)/cos(ß) = (61*8)/cos(15) = 488/0.965925 = 505.215mm Pitch Diameter: D' (known -DPn) = z/(DPn*cos(ß)) = (61/(3.175*cos(15)) = 61/(3.175*0.965925) = 61/3.066811 = 19.890inches Gear Ratio: mg = z2/z1 = 61/17 = 3.588235294 Operating Pitch Diameter - Pinion: d' = (2*C')/(mg+1) = lee

[notlawnomis]

Or you could just look HERE

[LEGEND]

Lee i have a question. Did you look that up or something or can you just remember it off the top of your head? Because i haven't a clue what you just wrote but if it was to say that i was a bit wrong and you looked it up then i am a bit scared. As i have bad feelings about people who try so hard to prove people wrong. It is just un-natural unless you realy don't like them.