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HomeAircraftHelicopterMain Discussion › mikado pinion and align motor question?
11-16-2014 04:50 AM  3 years agoPost 21
EEngineer

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TX

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But how can a head calculator provide info as to how mechanically robust one's drain train mesh is?

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11-16-2014 04:51 AM  3 years agoPost 22
Riq

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ND

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Im following along with the class, and he doesnt need a counterbearing support, hes talking about mod 5 for God sakes. he'll be fine without.
It comes down to Ron or someone chiming in about the bore on available pinions.
I like the info though, Thanks.

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11-16-2014 05:00 AM  3 years agoPost 23
EEngineer

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TX

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To condense that math....with some general theory...with regards to loads imposed...

Spur gears(simple pinions) impose a sideload determine by the depth of the gear mesh....but don't impose any axial loads...on motor/mainshaft bearings.

Pinion "modulus" is a term used to refer to the "depth" of the gear teeth.

With a spur pinion, the load is imposed on one single "tooth" at a time, as the pinion rotates....a mechanical limitation for larger helis.

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11-16-2014 05:11 AM  3 years agoPost 24
EEngineer

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TX

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To overcome this, the pinion "gurus" developed the helical pinion(the slant gear).

By the "slant", several pinion gear teeth are engaged during rotation, so that the load is "spread" over more than one tooth....and heavier rotational loads can be handled....since there is more sideload than a spur gear.

In addition, a single helix imposes an axial load...depending upon the slant direction of the helix.

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11-16-2014 05:14 AM  3 years agoPost 25
Riq

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ND

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I learned/overcame this empirically due to aligns 700e main gears.

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11-16-2014 05:17 AM  3 years agoPost 26
EEngineer

rrProfessor

TX

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To combat this axial load, the pinion "guru's came up with the double-helix pinion(the herringbone).

With the "herringbone", the axial load is neutralized by the 2 different teeth slant angles.

At the expense of the sideload being "doubled".

Which is why one might want to have a counter-bearing assy.
An assy. that supports the pinion shaft and the main shaft so that these loads don't affect the gear mesh negatively.

Are we having fun yet?.....

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11-16-2014 02:10 PM  3 years agoPost 27
tyfast27

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Dubois, Wyoming

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I know I'm learning allot! Haha Engineer do you know where I could get a bolt on counterbearing assembly for the 5003d? I can't find one on Mikado's website. It just hit me that I didn't look under the 600 though and I believe my 500 frame is also a 600 frame. I'll try that. I did go with the smaller 5 mm gear and a scorpion 4020 1100kv. I may regret this move because I do love power and the only reason I didn't go with a 6mm pinion is because I got in a hurry lol maybe the counter bearing won't be necessary unless I decide to upgrade the motor??? CANNOT WAIT TO FLY THIS THING!!!!!!

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11-17-2014 02:17 AM  3 years agoPost 28
EEngineer

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TX

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The Logo 600SX has a different CB than that of the 700/800XX.

I believe the 600SX CB is closest to what you want.

I'd call Mikado USA(toll free) and ask them what you would need.

FWIW

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HomeAircraftHelicopterMain Discussion › mikado pinion and align motor question?
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