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HelicopterEngines Plugs Mufflers Fuel › Dial indicating Clutch
08-01-2013 02:04 PM  4 years agoPost 1
datidun

rrKey Veteran

N Ireland

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Looking for the correct info on how to Dial indicate a Clutch shoe,i have it all setup and the Dial point indicator is at 0 on the Clutch,realizing the shoe itself does not have to be done and the Glow plug is out,i got my info from Raptortechnique which seems to be good info but does not mention the following, but my question is when turning the clutch does the percentage have to stay on the positive side as in +1 or +2 or can it move back to the negative side,thanx.

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08-01-2013 02:32 PM  4 years agoPost 2
Heli 770

rrProfessor

USA.

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If your dial is 0-10 and set at 0 you'll only get the high side reading. With a 10-0-10 and set at 0 you can get pos. & neg. readings from 0.

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08-01-2013 03:04 PM  4 years agoPost 3
Pistol Pete

rrProfessor

Seffner, FL

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https://rc.runryder.com/helicopter/...1/?p=3517968#RR

I know its not the same heli nor engine but great info either way.

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08-01-2013 04:00 PM  4 years agoPost 4
unclejane

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santa fe, NM, USA

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+1 to Dr. Ben's info. It's worth mentioning that the clutch at the shoes is going to be out of round by some amount normally, so getting values there wont help you.

Checking the runout of the engine crankshaft and then along the edges of the fan is the most productive place.

I always just assemble them, check it by eye on the bench and plug 'er into the heli. And I receive my payment in kind every time . But that's due to laziness in general. If you really need the system on the gnat's a$$, dialing it in is the way to go....

LS

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08-01-2013 04:53 PM  4 years agoPost 5
datidun

rrKey Veteran

N Ireland

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Thanx for the info i wish there was a video on this,so i know what im doing properly instead of guessing,i thought it had to stay on the positive side,if it goes back from +2 to -1,then the run out is not good,im concentrating on the Raptor Clutch and the Align one,i cant find anything irrelevant on Youtube.

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08-01-2013 05:02 PM  4 years agoPost 6
unclejane

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santa fe, NM, USA

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The important measurement is the spread between the max and min values, not their center. You can start the measurement from the highest measured point on the surface if you want to and just see how far down it goes. In other words, just put the dial on the surface, zero it out and go.

I also agree that checking the crank runout by itself is a useful measurement and is a good place to start. I've had motors with as much as 2 thousandths of runout measured at the center of the machined surface. On a plank, who cares, but in a heli that can create quite a buzzer of a situation....

LS

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08-02-2013 08:44 AM  4 years agoPost 7
datidun

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N Ireland

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I still dont understand,the run out can be from 0.1 to 0.3 according to Raptortechnique but it does not say which side,starting at 0 moving the Dial clockwise,the reading goes to 0.2 and then back to -0.1 is that run out wrong or right.if one needs to dial something in,it should at least say the reading should be +0.3 or close as possible.

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08-02-2013 01:00 PM  4 years agoPost 8
unclejane

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santa fe, NM, USA

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That's a total of .3 units (surely not tenths of an inch, tho?). the spread in magnitude between .2 and -.1 = .3. So you're within limits.... I'm assuming you're talking about thousands of an inch here, anyway.

LS

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08-02-2013 01:39 PM  4 years agoPost 9
jake21

rrApprentice

ontario canada

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You dont need to 0 the indicator if You can count to 3. It doesnt matter which way the indicator goes as long as it doesnt move any more than 3 thou. Just bolt the clutch on and it will be fine.

The only way to not crash is up

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08-03-2013 09:16 AM  4 years agoPost 10
datidun

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N Ireland

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Ok thanx Jake thats what i was looking for,so the Dial reading can move in either direction and will try to get it below 0.3.

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08-04-2013 01:47 PM  4 years agoPost 11
JuanRodriguez

rrProfessor

The Villages, Florida

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You mean, below .003 I hope !

Been there, done that and old enough to know better.....

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