New JETFAN-90, or " The sound of silence?" - Page 75 - RC Groups
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Dec 26, 2012, 03:11 PM
BOHICA!
Mike Warren's Avatar
Quote:
Originally Posted by xcz5785
Oh! I just assumed the motor and rotor needed to be balanced together. The motor is HET and it says dynamically balanced. I did not know the Jet fan came balanced. So once assemed it should be ready to go, huh?
"If" ........the big "if"...... You get your fan assembled and running and THEN find that there is a bit of vibration or resonance you can try turning the spinner in increments to fine tune to your satisfaction.
Basically just follow the directions that come with the fan......
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Dec 26, 2012, 03:21 PM
Registered User
xcz5785's Avatar
Thanks! Yes, I'm an EDF nube!
Dec 26, 2012, 06:02 PM
Registered User
Quote:
Originally Posted by Robert Belluomini
Another Jhh F4 Phil?
I have given thought to building one with the jf80 on 8S x2 of course!
No, Bob. Its a complete scratch build

I think the JHH F-4 wud be easier to do with a single larger fan this time, with current level of fan/pack development. A knife-little 5incher shud even be doable.

Cheers,

Phil
Dec 26, 2012, 10:41 PM
2018 EDF Jet Jam June 14-17
Robert Belluomini's Avatar
Yes but the sound of two fans in harmony gives me chills everytime.
Dec 26, 2012, 11:04 PM
Just having fun before I die!
BadLemon's Avatar
Hi Bob

So what do you think see below

thanks



Quote:
Originally Posted by BadLemon
It started out pretty snug but after several times on and off it slips off easy now. Do you think I oblong the adapter? I need to send Mike Warren an email and see if he has replacement adapters.


Originally Posted by Robert Belluomini View Post
How well does the adapter fit the shaft? A lot of motors have undersize shafts.
What motor?
Dec 26, 2012, 11:14 PM
2018 EDF Jet Jam June 14-17
Robert Belluomini's Avatar
I doubt you oblonged the adapter. You should be able to bring all three just into contact with the shaft check for run out and gradually tighten the set screws in a rotating pattern and check for run out.
Dec 26, 2012, 11:59 PM
BOHICA!
Mike Warren's Avatar
Quote:
Originally Posted by Robert Belluomini
I doubt you oblonged the adapter. You should be able to bring all three just into contact with the shaft check for run out and gradually tighten the set screws in a rotating pattern and check for run out.
I have "undersize" adapters for the set screw style, just shoot me a PM or email with your address and I will send you new ones of both standard and undersize.

NOTE: Beware motor shafts with a factory cut "flat" for setscrew, some are so large that the adapter cannot properly center on the shaft. For the older set screw adapters I do not recommend a flat other than a very small hand ground one of approximately 1/16" width, just enough to meet one of the grub screws.
In any case, if you have a flat on the motor shaft, locate the flat (if any) and center then tighten a grub screw in that one first......

BTW: for those so inclined, the standard for 5mm shaft is nominally 4.975mm. The undersized is nominally 4.93mm for some of the less than standard motor shafts out there = "other than Neu or HET700-60 or 700-68"
The really optimum fit would be one where the adapter has to be heated in order to slip on the shaft then shrink to fit upon cooling. No chance for slop or having to fiddle with set screw tension other than tighten them up.
-Mike
Last edited by Mike Warren; Dec 27, 2012 at 12:14 AM.
Dec 28, 2012, 07:43 PM
Fly now crash later
davecrash's Avatar
I got the mounting tabs in the mail today, thanks again Mike.
Dec 28, 2012, 07:47 PM
BOHICA!
Mike Warren's Avatar
Quote:
Originally Posted by davecrash
I got the mounting tabs in the mail today, thanks again Mike.
My pleasure
Dec 30, 2012, 09:14 AM
Banzai Institute
buckaroo's Avatar
Very good info on the shaft sizes Mike. I wish all the EDF motors we buy would come without flats such as the HET's. Hopefully manufactures will catch on. Also I believe most problems with anyone's fans are usually centered around run-out on bad fitting set screw type adapters. I wish more manufacture's would use clamp type adapters. Mike do you recommend eliminating the flat with JB weld or such when using a clamp type adapter? Thanks in advance for your help.

Dean
Dec 30, 2012, 09:27 PM
Just having fun before I die!
BadLemon's Avatar
Hi Robert

I found the problem with my fan 80mm unit the motor shaft has .005 runout in it. The funny thing is the shaft is true from the motor bearing out about a 1/4" then is off from there. I bought the motor used so I guess I should of checked it. Lesson Learned. There is a machine shop where I work so I should be able to clamp the shaft in a jig to straighten it with a arbor press and a dial inductor.

thanks for the help

Quote:
Originally Posted by Robert Belluomini
I doubt you oblonged the adapter. You should be able to bring all three just into contact with the shaft check for run out and gradually tighten the set screws in a rotating pattern and check for run out.
Last edited by BadLemon; Dec 30, 2012 at 10:01 PM.
Dec 30, 2012, 09:46 PM
Need 4 Speed!
pdawg's Avatar
Is there a U.S. distributor for this fan? I'd like to use it in my soon to be completed y/a A4
Latest blog entry: original Y/A F-18 Kit
Dec 30, 2012, 09:54 PM
Gorilla Glue Expert
PikeStaff's Avatar

Yah...


Talk to Mike at Performance EDF.
Dec 30, 2012, 10:00 PM
Just having fun before I die!
BadLemon's Avatar
+1

For Mike Warren that's him on post 1119 Here is his website

http://www.performance-edf.biz/jetfan80mm90mm.html
Last edited by BadLemon; Dec 30, 2012 at 10:06 PM.
Jan 02, 2013, 03:58 AM
Registered User
I slotted the holes in the fan mounting tabs and fitted some servo grommets to rubber mount the fan and it sounds even better than when it was hard mounted.


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