Motor Shimming

[jmiceli11]

I decided to go with an Actro 24-4 on the advice of a fellow Mikado Freak. He indicated that the motor needs shimmed because of a small amount of up and down play, and desvribed how to do it. I'm having a hard time envisioning it. Does anyone have pictures of thier shimmed Actro?

Thanks,
John

[OICU812]

I do not have a picture, but it is simple. All you need do is take off the c-clip you see on the Actro Motor shaft, place shim(s) to the inner race above bottom bearing and put c-clip back on and test for vertical play. Add or subtract shims as necessary to get no play. The shims I used were the Infinovation t-rex 600 damper shim kit that readyheli sells. I have also recently been informed the spindle shims from a Raptor 30/50 heli work as well for this purpose.

[jmiceli11]

I thought that the inner diameter of the shim,6mm, are wider than the shaft, 5mm. Is this okay?

Thanks for your help OICU812.

[OICU812]

OOOOppps sorry I was thinking of the 32-3!!!! The 24-4 is a 5mm shaft of course doh!! :arggg:

SO with that being said just find a shim .1-.3 in thickness and give that a go, of course with an inner diameter of 5mm, then all you really got to do is ensure it is not rubbing the outer race of bearing, if it is just file the outer diamter down with a small hobby file or dremel "carefully".

Now all this being said I should mention. If the washers/shims are not easily accessable to you or you do not have a hobby pile of crap like I do laying around you can also use some 609 or 690 retainer on the inner race of bottom bearing and leave it to set overnight and that will certainly hold it firm as well until a bearing change is in order.

[jmiceli11]

I found some shims at McMaster Carr that come with an inner diameter of 5,6, and 8mm and are 0.1mm thick. I measured the shaft and it is 6mm wide above the C-clip and 5mm wide below it.

Is the Actro 32-3 an 8mm shaft?

Thanks again OICU812,

John

[OICU812]

Yes the 32-3 is an 8mm shaft, it tapers down to 5mm where you put on the pinion. I am glad you got some shims, right on man. Better to do it right off the bat and not deal with any failures due to movement.

:smokin:

[Wenlock]

The 24-5 also has an 8mm shaft.

Anyone needing shims for an 8mm shaft might like to know that Hirobo part #2506-035 is an 8x12x0.1 shim washer. It's a perfect fit over the bearing - the o/d is small enough to clear the outer race. There are 10 shims in a pack.

[OICU812]

The 24-5 also has an 8mm shaft.

Anyone needing shims for an 8mm shaft might like to know that Hirobo part #2506-035 is an 8x12x0.1 shim washer. It's a perfect fit over the bearing - the o/d is small enough to clear the outer race. There are 10 shims in a pack.


If you "request it" then it does yes, otherwise the more "common" 24-4 is a 5mm shaft and 5mm running shaft.

[eltavito]

Jmiceli11,
So the shims you needed for the 24-4 need to be 6mm inner diameter?

[dahld]

The fact that I'm posting this will probably result in me having a problem I don't now have, but here goes. I have a new Logo 600 with an Actro 24-4. Yes, there was a slight amount of end play when I installed the motor. However, the herringbone pinion and main gear locks the motor shaft in place vertically, thus no up and down end play. I don't know how this is will affect the motor in the long run, but the main gear still looks brand new after 22 flights so far. The instructions said to set zero backlash, which I did, and there is still no play in the gears. Everything's running real smooth so far (knock on wood). Hope this adds something of value to the discussion.

[Ticidytoc]

Since I'm the rebel I decided not to shim the Actro I'm playing with. The movement in the motor was so minor IMO. I looked at the movement in the gear and it was about the same as the movement in the motor. The pinion seems to be holding up fine as well.

[MrMel]

Its all about getting it "right", in other terms, the motor will force its way to a certain point, so if that align up with what you set the pinion to its Ok.
but if you lets say push the motor down and put on the pinion, then you are in trouble.

Im too is of the belief that shimming isnt really needed, it simplifies things, but not really required.
I bet the motor wont run at its max efficiency when its shimmed out of center though.

[Daniel Jetschin]

The 24 actro series does have 6mm shaft where the bearings run on and then tapers down to 5mm. There are some with internal 8mm too, like the 32 series. Important, glue the shaft into the bottom bearing using green loctite (shaft glue) plus installing shims to take out the play as mentioned. otherwise the hardened bearings will groove into the regular steel shaft.


Dan

[eltavito]

Daniel,
Are you currently flying the actro 24-4?

Occy

[OICU812]

Hmmm I got to thinking about this, the Actros are 6mm at the bearing that is correct. Hmmph I was thinking of running the 24-3 on my flybar 600, anyone know of somewhere to get some 6m shims...?

[Daniel Jetschin]

Yes I do

Shawn I just put in some 8mm, not perfect but works :shock:

[OICU812]

8mm you say :shock:, I sent you pm dude.