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HomeAircraftHelicopterHelicopter Main Discussion › 8mm pinion
06-08-2014 08:18 PM  4 years agoPost 1
jim bateman

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carrollton TX

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Hey guys, where do I get a 11T 8mm hole pinion for a Mod 1 align 700?
straight or angled.

600 Nitro Jim

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06-10-2014 04:57 AM  4 years agoPost 2
JEEPWORLD2002/2

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Blue Bell, Pa

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Worse case buy a 6mm n bring it to a machine shop n have them lathe out the pinion to 8mm

Trex600n,Trex500,MR25,MikadoLoGo5003d/KDE,Goblin 380XNova,CastleCreations,Ys,JR XG8,Tags Mini XBus Dmss//FAA# FA3NYC9TAP

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06-10-2014 02:32 PM  4 years agoPost 3
Heli_Splatter

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USA

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You have to be careful here drilling a pinion hole too large will cause the pinion gear to collapse under stress. If it is not a standard stock item, I would be hesitant to proceed with this idea.

I would suggest that it might be better idea to turn the motor shaft in a lathe to a smaller diameter instead of drilling the pinion. This would not be a difficult operation for anyone with a lathe.

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06-10-2014 03:28 PM  4 years agoPost 4
AirWolfRC

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42½ N, 83½ W

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If that's a mod-1 pinion, forget it.
On a 11T mod-1 pinion, the pitch diameter is 11mm.
The diameter to the bottom of the tooth profile is less than that.
. . . and you want to put a 8mm hole in that ? ?

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06-10-2014 06:05 PM  4 years agoPost 5
jim bateman

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carrollton TX

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I thought of turning it down to a 6mm, my concern is that it might break at the transition under pressure.

600 Nitro Jim

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06-10-2014 07:53 PM  4 years agoPost 6
[X]Outlaw

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Trinidad and Tobago

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Turn it down to 6mm but with a taper to the major 8mm diameter. In other words don't turn it up to a 90* shoulder.

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06-10-2014 11:09 PM  4 years agoPost 7
earlwb

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Grapevine, Texas

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I thought that the folks were using motors that used higher voltages and larger pinion gears than 11 tooth ones. With 10 or 12 cell Lipo packs I did not think you could use a pinion that small on the motors.

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06-10-2014 11:22 PM  4 years agoPost 8
Heli_Splatter

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USA

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What end result are you trying to accomplish here? What is driving this mod?

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06-11-2014 05:14 PM  4 years agoPost 9
jim bateman

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carrollton TX

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What I'm making is a flying can 12ft tall and 5ish ft across, with two 10,000w, 500KV Nue motors, 12 cells.
Go to you tube and type in "hang can test 100% power", that test was with two 1250kv align 600 motors with six cells.

600 Nitro Jim

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06-11-2014 05:30 PM  4 years agoPost 10
earlwb

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Grapevine, Texas

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Oh OK, I see what you are doing.
That is a pretty cool machine to get working then.

Yeah I also think that you'll need to shave a little off of the motor shafts to fit the pinion gear.

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06-11-2014 06:17 PM  4 years agoPost 11
jim bateman

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carrollton TX

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Yah, I ordered the motors from "Nuemotors" around 1 year ago, and I just got them a few weeks ago, now it looks like I need to send them back to get the shafts reduced. This sucks.

What are the chances of the shaft breaking at the transition?

600 Nitro Jim

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06-11-2014 06:46 PM  4 years agoPost 12
[X]Outlaw

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Trinidad and Tobago

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Pretty low once its cut with a taper to transition to the major Dia.

Take a look at the shafts from Scorpion's 45xx series motors. These are 10mm shafts that are reduced to 6mm to fit the pinion. These shafts have a taper from 6mm to 10mm.

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06-11-2014 06:54 PM  4 years agoPost 13
jim bateman

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carrollton TX

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WOW, A 10mm down to a 6mm, maybe this will work.

600 Nitro Jim

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06-11-2014 07:41 PM  4 years agoPost 14
Heli_Splatter

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USA

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Turning the shafts down is not a big deal, ask around, someone knows a machinist close by.

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06-11-2014 08:04 PM  4 years agoPost 15
AirWolfRC

rrProfessor

42½ N, 83½ W

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In the neighborhood of 24,000 rpm for the motor is pushing it . . . no ?

Why don't you get a lower KV motor and use a larger pinion ?

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06-12-2014 04:02 AM  4 years agoPost 16
jim bateman

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carrollton TX

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I'm sending the motors back to Neutronicks Thursday.
Hopefully Mikes hobby shop will still be there to test in.

Keep an eye on you tube for more testing, it will be titled something like "can test", give me around a month to retest.

600 Nitro Jim

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