Tail drive transmission

[smith512]

I started my N7 build last night and began with disassembling and reassembling the tail transmission.  I noticed on my machine the 11 tooth spur that mates up with the spur gear on the main shaft has both longitudinal play along the shaft between the gear and the bearing and it has rotational play at the drive pin (the slot in the gear that catches the drive pin is bigger than than the drive pin which allows the gear to have slop between it and the drive pin..  The rotational play I am not overly concerned with (should I be??), but should I try to shim out the longitudinal play between the gear and the bearing?  It is maybe 0.5mm of play.

Thanks!

Steve

[Kevin Dalrymple]

Steve if you want bring the gear box to the field tomorrow morning and I can look at it and see what is going on with it. Kevin

[smith512]

I will do that.  Thanks!

[Rodney Kirstine]

Someone else had asked about this on another forum.  Here was Matt's reply:

The transmission is always loaded in the same direction during flight so the amount of backlash is insignificant. If the transmission was constantly slapping forward and reverse, I would worry about it.

If you want to reduce backlash to make you feel better, the first place to start is by loctiting the 11T spur gear to the spur gear shaft. This will eliminate about 1/2 of your back lash.

Definitely have Kevin take a look and see if the feels that the play in the direction of the shaft is normal since he's available.  It's always nice to get a second set of eyes on something if you're not quite sure.