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HomeAircraftHelicopterCentury Radikal G20-30 N640 Hawk Predator › predator fan/clutch runout question
01-19-2010 02:14 PM  8 years agoPost 1
flyinfriend

rrApprentice

North American continent

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Hi,

I dial indicated my fan to less than .001.

I installed my clutch shoe trying all four possible positions and I end with .010 when I dial indicate at the rim of the needle bearing at the center of the clutch shoe.

It seems I am at the mercy of however the bearing was pressed into the clutch shoe. Is this the case? If so is this going to cause issues? I can't believe I get the fan to less than one thousandth and then the clutch installs at 10 one thousandths. Is this a bad clutch shoe? Should I send it back?

Thanks for any advice,

Tom

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01-20-2010 01:55 PM  8 years agoPost 2
rotaryfalcon

rrApprentice

S.E. USA

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Just for the heck of it read the clutch at the solid part of the perimeter of the shoe. I was amazed that I got .001 on the fan right off. Reading the clutch at the soild perimeter yeilded the same reading in all 4 positions(.001). This was the easiest fan/clutch set up I have done in a while.

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01-20-2010 03:27 PM  8 years agoPost 3
flyinfriend

rrApprentice

North American continent

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Hi rotaryfalcon,

I did measure that as well. If I remeber correctly I had about .003 - .004 difference measuring on the outside opposing sides of the clutch show (not on the expanding shoe section). I am amazed that the bearing inside the clutch can be giving me such an extremely bad runout reading of .010 when my fan is under .001.

Thanks for your reply,

Tom

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01-20-2010 05:52 PM  8 years agoPost 4
rotaryfalcon

rrApprentice

S.E. USA

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Seems the commom one way is in a "sheet metal" housing as opposed to the cast/machined housing of a normal ball bearing( cant look at mine as the heli is finished). I dont know if I would trust the reading on the outer rim of the one way. There have been posts here(or maybe in the gasser forum) on reading a 10mm insert placed in the one way. That seems more trustworthy if the insert is true. You are probably pertty close on the run out reading the rigid part of the perimeter. If it reads the same or very close in all 4 positions you can just about assume it is that going to be the run out. Also check the clutch in the area of the 4 bolt holes for any machining burrs around the holes, fan also.

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01-21-2010 04:49 PM  8 years agoPost 5
jschenck

rrProfessor

La Vista, NE.

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I personally have never measured the one-way in the middle of the clutch. If you want to measure that runout I'd suggest that the only really accurate way would be to put a startershaft in it and measure the startershaft runout but even that would be tough to get the startershaft to grab evenly all the way around the one-way like it should under normal operation (with bearings supporting the top half of the shaft).

Measure the runout of the clutch itself on the solid side. Best I could get on the last setup was .002" with the 4 positions available. I was able to get it near zero runout by putting a small piece of aluminum foil between the clutch and the fan hub to 'push' the clutch over just slightly. Great results! I'm getting to redo it since I forgot to put the fan shroud base on <dangit!>

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