Shark413

iTrader: (24)

Regarding the set screw that holds the pinion on. Here is some info you may or may not be aware of. There are several different flavors of set screws, there are round, cupped, knurled, pointed, etc. For RC applications the cup set screw seems to be the most common. It has a small depression in the end that forms a cup on the end of the screw, this creates a circular cutting surface that digs into the shaft and helps hold it in place. The reason it is used for RC is because it provides good holding power without too much damage to the shaft. There is a variation of the cupped screw called the knurled set screw that is bascially a cupped screw with some raised points that provide a slightly more secure grip. The set screw with the highest grip is the pointed set screw, but it also causes the most damage to the shaft surface which could make the pinion more difficult to remove. One common cause of a cupped set screw not holding the pinion on is after repeated use the cup is basically smashed flat and no longer cuts into the shaft (see the last picture) so use a new screw if your pinion seems to slip.


Cupped set screw


Knurled set screw


Pointed


Cup screw that has been smashed flat from use


Actual photo of a new cup screw

jasonwipf

thats great to know!

tom_chang79

iTrader: (13)

Some really good info there Shark413, thank you!

cheldan

iTrader: (4)

Thanks for the info, Shark413

Duster_360

iTrader: (21)

Good info, thanks for posting!

Shark413

iTrader: (24)

Your welcome guys, I learn a lot on these forums so when I can I am glad to share the knowledge as well.

tom_chang79

iTrader: (13)

Keep it coming bud... I appreciate any and all infos of these kinds... You learn something new everyday. With an awesome forum like this, there's tons of knowledge to share amongst ourselves!!!

100 points of kudos to you!