Couplings

From sail to nuclear

Moderators: Admhawk, gingyer, brianc

Couplings

Postby garym on Wed Mar 18, 2009 10:36 pm

Well guys, took delivery of a couple of 500s motors and 2 x 15a viper marine ESC's yesterday only ordered them late Sunday night, big thankyou to Cornwall Models Boats fantastic service.

I have a problem, the universal couplings (brass and red plastic) make a hell of a racket when turning. My shafts are reasonably well aligned with the motors, although not spot on. I have also oiled them lightly but they are still noisey, any pointers please.

Gary
Take care, Gary.......
User avatar
garym
Admiral
 
Posts: 632
Joined: Fri Mar 13, 2009 9:23 am
Location: Aberdeenshire

Re: Couplings

Postby gingyer on Wed Mar 18, 2009 11:13 pm

WOOOOHOOOOO lvjb
It is not just me having this problem

I am wondering if the couplings are not aligned when being drilled in the factory
and that is causing the noise on mine :evil:

Will ask brian to post the couplings he uses
some rubber things fvjfo
Colin
User avatar
gingyer
Moderator
 
Posts: 1399
Joined: Wed Oct 31, 2007 12:01 am
Location: Glasgow

Re: Couplings

Postby Stu on Wed Mar 18, 2009 11:28 pm

I had this problem with one of my shafts on churchill, I aquired a new one from a different shop to replace it and it worked fine not a problem so i think colin maybe right with it being manufatured incorrectly.
Stu (Forum Admin)
User avatar
Stu
Administrator
 
Posts: 1010
Joined: Mon Oct 29, 2007 8:08 pm
Location: Lincolnshire

Re: Couplings

Postby Madrob on Wed Mar 18, 2009 11:50 pm

Ive seen a few at shows that seem to use a bit of rubber hose
Rob
User avatar
Madrob
Admiral
 
Posts: 1645
Joined: Mon Oct 29, 2007 11:42 pm
Location: Yorkshire

Re: Couplings

Postby Stu on Thu Mar 19, 2009 12:09 am

Alot of people use the rubber tubing with jubilee clips as rob has said, I would have to think you would need to be spot on mind otherwise you could put the shaft out of balance, on the upside it would possibly create a weak link so if the propeller became fouled it would go there first.
Stu (Forum Admin)
User avatar
Stu
Administrator
 
Posts: 1010
Joined: Mon Oct 29, 2007 8:08 pm
Location: Lincolnshire

Re: Couplings

Postby brianc on Thu Mar 19, 2009 12:35 am

Hi Guys,
The couplings that Colin is talking about that I use,I got from fleabay and they work pretty damned well....... fvjfo
I would recommend them,here`s the link........
http://rover.ebay.co.uk/rover/1/710-673 ... dZViewItem
measure once ...then measure again.
________________________________
Brian.

Once Navy...Always Navy.
User avatar
brianc
Moderator
 
Posts: 2525
Joined: Mon Mar 24, 2008 3:13 am
Location: Dumbarton Scotland

Re: Couplings

Postby Madrob on Thu Mar 19, 2009 12:54 am

Aye thats what ive seen
Rob
User avatar
Madrob
Admiral
 
Posts: 1645
Joined: Mon Oct 29, 2007 11:42 pm
Location: Yorkshire

Re: Couplings

Postby TheLongBuild on Thu Mar 19, 2009 1:06 am

brianc wrote:Hi Guys,
The couplings that Colin is talking about that I use,I got from fleabay and they work pretty damned well....... fvjfo
I would recommend them,here`s the link........
http://rover.ebay.co.uk/rover/1/710-673 ... dZViewItem



Mustangmark....aka Tango..aka MMb , Watch it, he'll have you buying a foggey as well.. :mrgreen:
Buy it , Build it (Over an extended period of time) , Play with it.. :twisted: Larry
http://www.runcornmodelboats.co.uk
User avatar
TheLongBuild
Rear-Admiral
 
Posts: 374
Joined: Tue Oct 30, 2007 12:01 am
Location: Cheshire

Re: Couplings

Postby brianc on Thu Mar 19, 2009 1:08 am

Doing a little experiment with the T22,
Fixed the motors in with silicone....a ready made flexible mount,(I`d already done it with my sons corvette and the thing runs totally silent)using this as a mounting and the rubber couplings should hopefuly make for a very quiet install.
I`ve just done a motor replacement on the corvette and it was a right pig to get out,so I think it should be strong enough,I`ll let you know how it goes :wink:
measure once ...then measure again.
________________________________
Brian.

Once Navy...Always Navy.
User avatar
brianc
Moderator
 
Posts: 2525
Joined: Mon Mar 24, 2008 3:13 am
Location: Dumbarton Scotland

Re: Couplings

Postby brianc on Thu Mar 19, 2009 1:16 am

TheLongBuild wrote:
brianc wrote:Hi Guys,
The couplings that Colin is talking about that I use,I got from fleabay and they work pretty damned well....... fvjfo
I would recommend them,here`s the link........
http://rover.ebay.co.uk/rover/1/710-673 ... dZViewItem



Mustangmark....aka Tango..aka MMb , Watch it, he'll have you buying a foggey as well.. :mrgreen:


Gonna get me one of those new fangled smokey things for my Sloop at the North East Show next weekend :wink:
measure once ...then measure again.
________________________________
Brian.

Once Navy...Always Navy.
User avatar
brianc
Moderator
 
Posts: 2525
Joined: Mon Mar 24, 2008 3:13 am
Location: Dumbarton Scotland

Re: Couplings

Postby mcduck on Mon Aug 17, 2009 7:45 pm

I have had the same problem, I have taken mine to the pond several times and the last time started getting a vibration from the shafts took out the motors span them and quiet, fitted a spare shaft done the same with the universal joint on and it had a distinctive vibration. I have been looking into trying other ways, is it possible to use Wire Flexible couplings ?

Antony
User avatar
mcduck
Warrant Officer
 
Posts: 132
Joined: Wed Feb 25, 2009 2:22 am

Re: Couplings

Postby garym on Mon Aug 17, 2009 8:52 pm

Antony, I overcame the problem by gently tapping the brass joining luggs with a hammer, this tightened them and all is fine now, give it a try......

Gary
Take care, Gary.......
User avatar
garym
Admiral
 
Posts: 632
Joined: Fri Mar 13, 2009 9:23 am
Location: Aberdeenshire

Re: Couplings

Postby mcduck on Mon Aug 17, 2009 9:10 pm

I will give it a go.
If there is any more ideas i would also welcome them as an option.

Thanks
User avatar
mcduck
Warrant Officer
 
Posts: 132
Joined: Wed Feb 25, 2009 2:22 am

Re: Couplings

Postby snowwolflair on Mon Aug 17, 2009 9:30 pm

The only thoughts I have is the way I do it and I dont seem to get trouble.

I like to use the double universal jointed huco couplings on 4mm shafts. I put the two ends on the motor and shaft on their own first and spin them up and adjust them until they dont vibrate. Even flash on the plastic can affect this. If they are double sided tapped I use two grubs for ballance rather than just for tightness. Once they run smoothly I fit the centre part which is the two universal joints and a brass joiner and I adjust this till no vibration. Takes about an hour. I then dab thin cyano onto the centre joint where the brass joiner is as this can move at high rotations.
David
User avatar
snowwolflair
Admiral
 
Posts: 1891
Joined: Mon Feb 04, 2008 1:47 pm
Location: Windsor

Re: Couplings

Postby shipmate60 on Wed Sep 16, 2009 10:51 pm

Mark will make any size.
His website is: http://marksmodelbits.ieasysite.com/index.htm

Bob
User avatar
shipmate60
Leading Hand
 
Posts: 47
Joined: Fri Nov 02, 2007 12:04 am
Location: Southampton

Next

Return to Propulsion


Who is online

Users browsing this forum: No registered users and 1 guest