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I want to produce fenders for R/C cars and i am really not sure about the rubber to be used. The finish is the most important, it needs to have a polished look (not rough at all) but not shiny, and black color. It has to be quite flexible and must allow glue to join the final piece with other...

thank you for your feedback Phiga, i hear you , i think the factory dont care much of what they say to me cause i dont know much of rubbers , so they think i will dig what they say

interesting, thanks

with other words, the more close to the wheels there is more torque, and the more close to the motor there is less im sure we are talking about the same thing but i still dont get your first sentence as if torque is bigger , gears should be heavier , not lighter i gues i am getting it wrong...

i am confused ,i gues you mean "divided" instead "multiplied" on this sentence "The further back in the drive line the torque is multiplied, the lighter the components can be." not sure if i am right cause my english is not so good , but it doesnt make sense to me in the way it is said

thanks for your answer RossABQ now i wonder , is there a reason in making such big reduction in the axle and not in another point in the transmission train?

i gues it is because same tooth of pinion allways mesh with same teeth of spur so any problem with a specific tooth will become bigger

thank you for your input dgallup! i see why integer values can create wear problems, but about the wear created by less than 13 teeth , why this happens exactly ? is it because not smooth mesh?

hummm ... to make a 13 teeth pinion forces me to make a huge spur which is not good for the diffbox size i am making a 1:10 scale axle so the size of teeth must be really small, but there is a limit , i cant make them too small because they are hard to manufacture and also because of precision...

13 teeth pinion, that was my next question :-)

thanks for the reply!!! 5:1 is huge reduction, i wonder how can they put gears with such ratio inside a not big diffbox .... please check this pic, i dont think there is room for more than 2:1 in there http://www.bushwacker.com/images/uploaded_images/radC068D.tmp.jpg

Hello i am triyng to find information about what would be a common gear ratio for the bevel gears inside a tipical truck / Suv Axle, i am designing a toy truck axle similar to this http://hometown.aol.de/scaleoffroad/vorderachse_2_offen.jpg any help apreciated thanks

thanks for your reply, so you saying that mixing some BR with NR wont add better resistance ? instead of that i should ask for adding carbon black?

i think i got what you mean , thank you very much

i woudnt want to abuse , but looks like you missed my last question : to use rubber compound with sulfure already on it , is exactly the same than curing the rubber with sulfure? should it cause similar properties to the final rubber part?

yeah... there is a little mess here...maybe i was not clear enough i design the tires, and pay a rubber parts company to make moulds and final pieces, then , the rubber parts company buy the rubber from a rubber material supplier to make my parts rubber part company told me that the rubber...

i aksed my rubber manufacturer about sulfure curing, they told me the sulfure it is already inside of the rubber when they purchase the material, so it is not needed to add sulfure on the cure is this normal? will sulfure inside the rubber cause the same sulfure cure properties?

thanks a million

one more question, will the sulfur cure harm the takyness of NR?

thank you tom