cutting flatspot help.....
 

I've got a lehner Basic XL motor. Could you please tell me, is it really neccessary to cut a flatspot, the pinion seems to stick on the spindle quite well anyway. My problem is I don't have a dremel, I've tried to file the shaft, but because the lehner shafts are hardened steel it doesn't work.....any help would be welcome....

yes 99.9% of the time u need a flat spot go to the hardware store and get a grinding stone 4 a drill less than 4 bucks and start looking 4 a good price on a dremel

There is no need for the flat spot, I have had zero problems with the pinion coming loose thus far.

If the set screw is big enough to allow ample torque, the flat spot isn't necessary.

I have roughened up the shaft slightly with some sandpapers. Gonna use a bit of loctite (blue stuff), hopefully should be fine. Thanks for the help guys. I'll report on how it performs.

Don't glue the pinion on the shaft.. It can be a pita to get it off, when you dropped too much LT on it..

That's happened to me once already.....got a 16t pinion permenently fixed on one of my titans. I meant just glueing the grub screw to the pinion. Thanks for the help though

well, I tried numerous times, but it seemed no matter what I did the pinion gear kept coming loose! I'm using a robinson pinion (the one's mike sells) - anyone know why this is happening. Or should I just give in and make a flatspot. If so, is this the kind of thing I should be using? http://cgi.ebay.co.uk/ws/eBayISAPI.d...980323021&rd=1
The only thing I'm slightly concerned about is, brushless motors don't offer much resistance (basically none), so won't the motor spindle just spin around with the grinding stone...?

again thanks for your help guys! :)

Thats really odd, I haven't even used loctite, and I'm running robinson pinions also and they stick just fine, I haven't even noticed a difference between my brushed ones with flat spots. Are you using a hex tool to tighten that thing down or just the flimsy L looking tool?

The best way to put a flat spot on the shaft in my opinion is to take a pair of needel nose pliers put a peice of a rag around the shaft against the end of the can grip it with the pliers. Then take your dremal and make your flat spot. The flat spot only needs to be about 1/16 -1/8 wide and about half the lentgh of the shaft.

that's how I do it, too.

GREAT MINDS THINK A LIKE:eek:

:)

I stripped the set screw on a pinion cause I put a little too much muscle into it...I had to cut it off....with a Dremel. Dont know where I would be without my trusty Dremel...you dont have to get a Dremel brand either, you can get cheap rotary tools almost anywhere now...

stripped thread or a stripped head?