Gear mesh- how to set

[Westwind]

Well I finally got all the parts together on my new to me E325 SE, tunes in all the servos and adjusted the push rods as needed. I got her out side and spun her up... heard a some alarming noise and shut down. too late, i forgot to check the the mesh and now I need to replace both the big and small gears. So now that I'm going to replace the gears are there any other part that might need replacing due to the mishap. Also what is the best way to set the mesh

[michael_fly_more]

Hi
ive got to know how much back lash just by rocking the gears feeling and listen

but i used to run a bit of paper between the 2 gears ie main and pinion gear
when it comes out the other side should be a nice sharp crinkle in the paper with sharp edge to each crinkle
to tight it will rip the paper to loose and it wont leave a sharp edge
once done just rock the main gear back and forward should be very little back lash

try in a few spots by turning the main gear round as often there be a high spot
if so find the high spot where there is least or no backlash and just back the motor off very very slight
some parts there be more back lash but this will be ok as you dont want to bind the gear on the high spot

if unsure just do the paper trick in a few places

go fly have fun

[collective itch]

Just put it tight, then back it off a tad, so you can rock it back and forth a tad. To loose it and you'll strip a tooth. To tight and it will bind. I come from rc cars, so I knew the way to do it. Basically you want minimal back lash, without it binding.

[chris jones2.4]

You don't want a too tight gear mesh, when the gears run together, it causes friction and
the material expands causing it to become extremely tight but to loose and any torque going through it just shreds iit straight away, like ssaid before, tight and back it off slightly

[helijohn]

i used to run a bit of paper between the 2 gears ie main and pinion gear
when it comes out the other side should be a nice sharp crinkle in the paper with sharp edge to each crinkle
to tight it will rip the paper to loose and it wont leave a sharp edge
once done just rock the main gear back and forward should be very little back lash

try in a few spots by turning the main gear round as often there be a high spot
if so find the high spot where there is least or no backlash and just back the motor off very very slight
some parts there be more back lash but this will be ok as you dont want to bind the gear on the high spot

if unsure just do the paper trick in a few places

go fly have fun

+1.

That is what I do. You have to find the tight spot mesh wise which I mark with a chinagraph pencil or such. I move the motor/pinion in tight with paper in beforehand at the tight spot before locking it up - it's a bit like using a feeler gauge - so you know there will be clearance. Then, after tightening, I run paper through as has been described to check the mesh. Also it depends on what size heli it is as to how thick the paper needs to be but in general I use printer paper cut in to strips (because I know I'll probably use at least four or five strips before I'm done). You do get the feel for play but by putting paper in before tightening you have a start point.

[Westwind]

Thanks for your input guys, sounds like the same principle a my rc cars. could the destruction of my gears be caused by incorrect throttle curve. Ie to much torque with high pitch angle? What is the best way to figure out the throttle curve? Or am I way off base?

[cjcj1949]

You should start it smoothly and slowly. Your esc should have a soft start to help you.

[tourerjim]

How did you do both gears.??? assuming your referring to main & auto rotation gear

[Westwind]

I started up slowly and before I got lift off she started making a bit of a bagging sound. Then typed over when I chopped the throttle.

[tourerjim]

Sounds to me the gears stripped when she toppled, the noise must of been from some sort of mechanical fault.???

[helijohn]

Well I finally got all the parts together on my new to me E325 SE, tunes in all the servos and adjusted the push rods as needed. I got her out side and spun her up... heard a some alarming noise and shut down. too late, i forgot to check the the mesh and now I need to replace both the big and small gears. So now that I'm going to replace the gears are there any other part that might need replacing due to the mishap. Also what is the best way to set the mesh

The Mini Titan is a great small heli, once you are sorted I am sure you will love it.

You should start it smoothly and slowly.

Yes so true, I was always told we don't want any surprises!!!