RunRyder RC
WATCH
 1 page 743 views POST REPLY
03-29-2005 02:51 PM  13 years agoPost 1
Dr. Fibinotchi

rrKey Veteran

Sioux Falls SD

My Posts: All  Forum  Topic

Getting a engine back from Hanson and wondered if anyone had any pics of doing a dial indicate with a gasser for runout. I want it as smooth as possible. Looking for a little help a I have never dont it before.

-Cody

If you want others to be happy, practice compassion. If you want to be happy, practice compassion.

PM  EMAIL  GALLERY  Attn:RR  Quote
03-29-2005 03:42 PM  13 years agoPost 2
mrNoodles

rrProfessor

Borlänge, Sweden

My Posts: All  Forum  Topic

It works the same way as on a nitro engine.
Balance the fan on a hi-point balancer or equal first.

Then add a small amount of thin oil on the crankshaft, makes the fan 'slide in position' easier.
Add Loctite on the bolt holding the fan, tighten it and check with dial indicator.
If the runout is to big either loose the bolt and the fan and turn the fan ½ a turn on the shaft or tap carefully tap on 'its high side'.

It can take some time to get it right.

DrBen has wrote a great post about fan alignment.

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
03-29-2005 05:22 PM  13 years agoPost 3
cdrking

rrElite Veteran

Seattle

My Posts: All  Forum  Topic

I just don't understand how there can be any adjustment with the collets being tapered.

What are you actually adjusting?

Jeff

PM  EMAIL  GALLERY  Attn:RR  Quote
03-29-2005 05:56 PM  13 years agoPost 4
Dr. Fibinotchi

rrKey Veteran

Sioux Falls SD

My Posts: All  Forum  Topic

hmm.
well I could fill a page trying to understand how I understand it, but Its a dial on the side of the fan that measures the runout. See Agrav8's century pred build. Its goes into more detail on that thread.

Its the 'wobble' no its not just bolt on and fly....lol. If you do you are asking for more trouble. I had mine done by a guru when I bought my heli, but now its time for me to learn and do it with the new engine.


I was looking for a little more on the MA instead of the pred mechanics.

things to look for etc.. tips tricks on the motor part.

-Cody

If you want others to be happy, practice compassion. If you want to be happy, practice compassion.

PM  EMAIL  GALLERY  Attn:RR  Quote
03-29-2005 06:39 PM  13 years agoPost 5
mrNoodles

rrProfessor

Borlänge, Sweden

My Posts: All  Forum  Topic

I just don't understand how there can be any adjustment with the collets being tapered.
If the shaft and fan was 100% correct no dial indicating would be needed, but since non of them are, its about fitting them together as good as possible.

My Zenoahs shaft had 0.02mm run out, got the fan down to the same.

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
03-29-2005 08:26 PM  13 years agoPost 6
cdrking

rrElite Veteran

Seattle

My Posts: All  Forum  Topic

So my question still stands. What are you adjusting??????

Jeff

PM  EMAIL  GALLERY  Attn:RR  Quote
03-29-2005 09:38 PM  13 years agoPost 7
mrNoodles

rrProfessor

Borlänge, Sweden

My Posts: All  Forum  Topic

The runout!?

The runout may vary depending on how the fan is rotated when putting on to the shaft, so its a trial and error mission.

You can also 'tap down' (no gorilla torque used here) the side of the fan that is 'high' when checking it on the inside of the fan hub with a dial indicator.

Here´s a great and explaining post by Dr.Ben.

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
03-30-2005 12:09 AM  13 years agoPost 8
Dr.Ben

rrMaster

Richmond, VA, USA

My Posts: All  Forum  Topic

I just recently dialed a fan on a gas engine for a friend of mine. The design of the shaft on the engine does not allow for a lot of tapping as you go. The shaft is a single taper, and the fan is machined to fit it. There are no collets.

So, what to do?

First, you do need to rotate the fan a bit to find the best spot. Fortunately, this procedure is fairly predictable because you can keep track of where the fan is on the shaft. It's a giant PITA on the glow engines because you have two collets to keep indexed as well as the fan itself. That's why I don't do that on the glow engines unless something is way the heck off. If the fan on the gas motor starts going down at a thou or less, a few taps as you go and before the nut is tight will improve the runout by about a quarter thou a maybe a little more. You can forget trying to tap out a thou or more of runout. It won't happen. Fortunately, the cranks seem to be machined pretty well, as are the fans. I had to fiddle for about an hour before I ended up with abut 3/4 to 4/5 thou runout on the gas fan I did. It's not the 1/4 thou I can get on the glow engines, but it's pretty good considering the limited ability to adjust the fan as it goes down. The tolerance of the machine work on the crank and fan mean everything here.

Ben Minor

PM  EMAIL  GALLERY  Attn:RR  Quote
03-30-2005 03:36 AM  13 years agoPost 9
Dr. Fibinotchi

rrKey Veteran

Sioux Falls SD

My Posts: All  Forum  Topic

ok to make sure I understand.
runout must be dont on the inside of the fan collet and outside?

It is dial indicated so if the fan was laying horizontal or flat the dial indicator is measuring the runout of up and down movement of the fan as it goes round and round (dial part on top of fan).

Not the in and out of the circumfrunce of the fan dial indicated from the side correct?


inside the collet this is measuring the shaft more then? What would you do if you where off just pull off rotate and try again correct?


I understand the how to read a dial, but am unsure if I am correct on where to look and why.

-Cody

If you want others to be happy, practice compassion. If you want to be happy, practice compassion.

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 743 views POST REPLY
 Print TOPIC  Make Suggestion 

 3  Topic Subscribe

Tuesday, July 17 - 3:34 am - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online