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Fast Lad Performance . Ace Hobby . Esprit Model

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Synergy R/C Synergy N9 > Different method to dial the Fan Hub
 
 
Chuckie
Key Veteran
Location: Crofton Maryland, MHA member

I have an updated method to dial indicate the fan hub and clutch. I found the best method to get the fan hub straight was to dial indicate the inside edge of the fan hub, near to the engine bolt. I set the dial gauge to contact the inside surface not the top side of the fan hub.

In my case I noticed when the fan hub top surface outside edge was at 0.002 inch the inside edge was 0.006 to 0.009inch. I tried a number of ways to get the fan hub to less that 0.002inch but still the inside edge was way off. It's more important to get the inside edge straight as the clutch ring contacts this surface.

The rest is the same as I reported in my other post on Building Suggestions. http://www.runryder.com/helicopter/t274515p1/

I did make the screw holes in the clutch a little larger so I could move it further and get a lower number.

I was able to get the following after a spent a few hours trying all different ways to dial the fan and clutch. Fan hub surface 0.001in, fan hub inside edge 0.003, lower clutch shaft 0.003, upper clutch shaft 0.003.

Charles

Please stand by for faster service!
08-07-2006 Over year old.
 
 
wore-out-pilot
Senior Heliman
Location: Louisville, Kentucky USA

Hi Charles, Glad I got to meet you at Ircha. Well I got my kit and when I dialed the fan I got .0025 thousands and the end of shaft was about .003 thousands. What do you think?

I'm really enjoying the way its going together. I like the way the GV-1 senser is mounted. Looking forward to getting mine done.

Again it was good talking to you at Ircha.

Bill

RCRC Louisville Heli-Boys



MAKE-IT-HOT They call me aka the hammer
08-24-2006 Over year old.
 
 
Chuckie
Key Veteran
Location: Crofton Maryland, MHA member

Hi Bill,

It's good to hear your N9 build is going well. I know you'll like the way the N9 fly's. Let me know if you have any build or setup questions. I've been helping others and have posted tips so review my posts or PM me.

Your clutch runout sounds good. My heli has that same amount of runout and with the YS91/Hatori SB-16 it's very smooth with no signs of vibration in the air. Fuel tank is without foam or shaking fuel. I know it takes time to get these low numbers and wish they were lower but I don't see a problem with the heli in the air. Be sure to check the top of the clutch shaft and bend the shaft at the bottom to get the entire shaft to match the bottom runout.

I also checked other parts for runout and tired to adjust as needed, parts like the two torque tube supports, main gear on auto hub, crown gear, and clutch bell to pinion.

Good luck

Charles

Please stand by for faster service!
08-24-2006 Over year old.
 
 
PIGROLL
Senior Heliman
Location: Pig Pen

Take out your glow plug and turn starter coupling as you are watching engine and muffler and let me know if your engine is moving around.I spent two hours dial indicating and it seems impossible to keep fan from moving as you tighten the nut down.The rest of the build went smoothly but I am very dissatisfied in this coupling situation.Any ideas?????????I am sick of tap tap tapping the thing.

The cheese slipped off my cracker a long time ago
08-25-2006 Over year old.
 
 
Chuckie
Key Veteran
Location: Crofton Maryland, MHA member

Maybe the collets are bad. Others have mentioned having a hard time as you. See this link.

http://runryder.com/helicopter/t279...collets+synergy

Suggest you contact Synergy RC and ask for new collets after you try the recommendation to cut the slot in the upper collet a little larger.

Good luck

Charles

Please stand by for faster service!
08-25-2006 Over year old.
 
 
carcrasher
Key Veteran
Location: east coast

Chuckie
Thanks for the good advice. I'm sure this will work on any heli using the same mounting system. Any pics of what you did or is it to late since it's already in the heli? To dial indicate the inside edge did you use a test indicator?
08-25-2006 Over year old.
 
 
misio
Veteran
Location: ....

Quote 
I spent two hours dial indicating and it seems impossible to keep fan from moving as you tighten the nut down.


tip for you:

Try hold crank and fan at the same time when tighten nut down, this will stop fan from moving.

It will work.
08-25-2006 Over year old.
 
 
Chuckie
Key Veteran
Location: Crofton Maryland, MHA member

Sorry for the quality of the pics. They are from my crappy phone camera.

I used a Teclock dial indicator. In the web page below it came out looking good in the important accuracy and repeatability test results.

Regards,

Charles

P.S. I didn't use the hammer in the pics.

http://longislandindicator.com/indicator.html



Please stand by for faster service!
08-25-2006 Over year old.
 
 
misio
Veteran
Location: ....

See if you can get this one, 0,0005' it is much easy to read



I purchuse my on ebay

http://cgi.ebay.com/INDICAL-I-D-CAL...1QQcmdZViewItem

http://cgi.ebay.com/ebaymotors/PREC...018826704QQrdZ1

http://cgi.ebay.com/TEST-DIAL-INDIC...1QQcmdZViewItem



and I will try this way



this way your reading will be more on the dot.

Hope that helps


PS: I can do for you for one off those 611 in the back LOL
08-25-2006 Over year old.
 
 
Chuckie
Key Veteran
Location: Crofton Maryland, MHA member

"Try hold crank and fan at the same time when tighten nut down, this will stop fan from moving."

Don't hold the fan. As you can see in one of the pics you should use a crank locking tools as you don't want to touch the fan or fan hub when tightening the engine nut. Hold the crank with the tool and tighten the nut.

The other thing I do is take my time and tighten the nut only 1/8 a turn at a time after getting the nut a little snug. Then I put pressure on top of the hub with my hand to move it in the right direction. I see the dial read less than 0.001 or as low as possible then remove the back plate and using the lock I tighten 1/8 turn. I put the back plate back to hold the connecting rod in the right place the check the fan runout. If you tighten the nut too much at once the fan will be off if you're unlucky.

I haven't tried or needed to tap the fan hub with a hammer. If the collets are way off no amount of hammering will help.

Chuckie

Please stand by for faster service!
08-25-2006 Over year old.
 
 
Chuckie
Key Veteran
Location: Crofton Maryland, MHA member

Nice one misio.

Charles

Please stand by for faster service!
08-25-2006 Over year old.
 
 
PIGROLL
Senior Heliman
Location: Pig Pen

Thanks all.Can someone who has determined that they have correctly dialed in,please remove glow plug and turn engine and look for movement of muffler so as I can get on with build?

The cheese slipped off my cracker a long time ago
08-25-2006 Over year old.
 
 
carcrasher
Key Veteran
Location: east coast

Movement of the muffler? how so? Is it moving up/down or side to side?
08-25-2006 Over year old.
 
 
Chuckie
Key Veteran
Location: Crofton Maryland, MHA member

pigroll,

I'm working on my machine tonight and the clutch shaft is very straight so no movement can be seen in the motor/muffler when I turn the motor over. If yours is moving then the fan hub/clutch must be off by very large amount.

I also spent some time getting the motor to sit straight and true in the side frames. I didn't install the clutch bearing block and measured the distance between the clutch shaft and each side with the motor and fan shroud lightly tightened in place, at the top of the frames. I was able to get 10.03mm and 9.98mm distance from each side. If I turn the motor the reading change by 0.003inch I guess.

I checked the fan shroud for clearance and also the back lash in the main gear. In addition I installed the clutch bearing block and made sure there was very little up and down play in the clutch bell when the bolts were tightened.

Regards,

Charles

Please stand by for faster service!
08-25-2006 Over year old.
 
 
PIGROLL
Senior Heliman
Location: Pig Pen

Thank you Chuckie,

The cheese slipped off my cracker a long time ago
08-25-2006 Over year old.
 
 
PIGROLL
Senior Heliman
Location: Pig Pen

Carcrasher,It is just easier to see if you are watching exhaust side for movement and the movement is a type of full circle as I turn engine.Bigtime.

The cheese slipped off my cracker a long time ago
08-25-2006 Over year old.
 
 
misio
Veteran
Location: ....

This is the way am doing:

- use some lube on fan and cutlets
- crank down fan nut with some medium force wile holding crank ( OS crank locking tool is very nice)
- mount all on dial stand and check run out
- mount crank locking tool and rest on flat hard table, use rubber or plastic hammer to top fan ( watch for plastic fins ) the hole idea is to give a small top on fan only but is very important to secure crank
- Check run out again and again tap fan tilt you get good run out.
- Hold fan ( am using MA fan tool, it may work on synergy too. If not you can make one) and crank, crank down.
- Mount fan on stand and check run out.
- Repeat process off checking run out and cranking down until you get good run out



If you hold fan the way I do it will same you a lot off time.

Hope that helps
08-25-2006 Over year old.
 
 
Droid
Elite Veteran
Location: Deep down in the Southwest- UK

When i installed my fan hub i used a turned down socket that was not quite interference fit inside the hub, kept everything straight and true!! No DTi required

Quotes may have been changed for my own amusement
08-31-2006 Over year old.
 
 
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Synergy R/C Synergy N9 > Different method to dial the Fan Hub
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