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HelicopterMain Discussion › RunOunt help again please
12-30-2009 01:39 PM  7 years agoPost 21
heli-cuzz

rrElite Veteran

Pittston, Pa. USA

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i guess guys are sanding it down where the hub meets the motor so it will kinda tilt. But dont know which measurement to use top or side of hub
I understand how that method would work with a hub that is adjustable.
The TZ hup screws onto the crankshaft leaving no play for adjustment.
Also, by sanding an angle at the engine side will require more force to get it seated correctly. Most likely it will cause damage to the engine bearing/s in the process from overtightening.
Here's a link to maybe help you understand different types of runout.
http://www.aerotech.com/products/engref/runout.html

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12-30-2009 03:21 PM  7 years agoPost 22
S Bell

rrApprentice

Nova Scotia Canada

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Or just take that one to the machine shop and have them true it up by removing a thou or so on the od and the face.
The problem still lay in the ID of the fan and screw holes for the clutch. The clutch seats inside the bore of the fan hub.
So if you did machine anything of any importance it would be the ID and the top face, but then the inside hole would be too big to center the clutch boss. You are also left with elongating the holes in the steel clutch and using a filler so things don't shift once correctly positioned. I like to keep the my process simple when possible, but you can skin cats differently.

The bending stress does not seem to load the bearings from my experience, it goes into the crankshaft thinner area above the bearing inner race. You can check this with the piston removed. If you relieve the lower section of the fan hub (the smooth area seating above the bearing inner race before the threads) with sandpaper the effect is reduced and distrubuted somewhat due to the long arm. Granted I have not corrected for 16 thou but with 8-10 it worked fine.

Stephen

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01-02-2010 04:05 PM  7 years agoPost 23
heli-cuzz

rrElite Veteran

Pittston, Pa. USA

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Dial indicating

I dialed my TZv2 90 fan/hub/clutch mounted on a YS91. When I first put it together. I rushed it with no intentions to continue building until I checked the runout.
I finally pulled the engine to check the runout.
My 1st reading was .003 I turned the clutch shoe 90 degrees and checked. The 2nd reading went up to .005.
I turned it another 90 degrees equalling 180 from the 1st .003 reading and it jumped to .008
I did one last check with a final 90 degree turn of the clutch shoe and it is less than .001
It seemed that I had made a mistake somewhere. I checked and re-checked with the same results as above.
I even re-checked this morning it still is less than .001 Its almost deadon accurate to 0.
Maybe I got lucky but this baby is good to go.
I checked the OD diameter of the clutch shoe at the mounting bolt positions and also checked it at the silver ring where the starter shaft enters the one-way clutch. All readings coincided with one another.

No tilt-a-whirl action. The runout was 0 there.

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HelicopterMain Discussion › RunOunt help again please
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