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Author Topic: Coupling  (Read 1514 times)

DaveB

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Coupling
« on: March 28, 2021, 12:49:32 pm »

I hope someone may be able to help me, i have 2 motors which were taken out of the Model Slipway Trent i intend to use them in a tug i am refurbishing, for some reason my mind has gone blank and i cannot work out the thread size on the output shaft. Does anyone out there help please.
Dave B
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rnli12

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Re: Coupling
« Reply #1 on: March 28, 2021, 01:13:07 pm »

Probably 4mm
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DaveB

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Re: Coupling
« Reply #2 on: March 28, 2021, 03:29:57 pm »

I managed to find a battery for my vernier and the overall shaft is 6mm diameter so i assume it would have a m6 thread.
Thanks
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John W E

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Re: Coupling
« Reply #3 on: March 28, 2021, 04:14:45 pm »

if a 6mm nut doesn't fit on de shaft - me thinks - it could be ye old English size - BA size.


possibly 2BA


John
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Shipmate60

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Re: Coupling
« Reply #4 on: March 28, 2021, 04:25:49 pm »

If you use silicone tubing instead of a huco type coupling ir will fit over 6mm shaft without a coupling end.


Bob
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DaveB

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Re: Coupling
« Reply #5 on: March 28, 2021, 05:29:06 pm »

Thanks for the information everyone, i'll have a play and get a coupling sorted out.
DaveB
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John W E

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Re: Coupling
« Reply #6 on: March 28, 2021, 05:41:42 pm »

HEY BOB/DaveB


THE BRIDGE HAVE JUST RANG DOWN AND THE ENGINE ROOM TELEGRAPH IS SHOWING AN EMERGENCY FULL ASTERN - WE ARE GOING TO HIT THE CANAL SIDE AGAIN


are we sue or even sure (the main engines are vibrating hard in reverse) its 6mm thread on this shaft?   if it is, its going to be an oddball, because, a lot of propellers are tapped out 5mm and its normally a 5mm shaft.  So, in old English size it possibly may be an OBA size - but - doubt it.


Try a 5mm nut on first.
 
John
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SteamboatPhil

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Re: Coupling
« Reply #7 on: March 28, 2021, 07:17:08 pm »

As John has said I would go 5mm as I also have never heard of any motor using 0BA (ye old stuff that I still use  {-) )
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RST

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Re: Coupling
« Reply #8 on: April 01, 2021, 10:58:20 pm »

I've not come across many motors with a threaded shaft either. Perhaps a pic might help? Is it the old MFA belt drive set-up?  Were they called "olympus drives" or something like that?
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tonyH

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Re: Coupling
« Reply #9 on: April 02, 2021, 10:03:42 am »

Someone hasn't put a 1/4 inch thread on a 1/4 inch (6.35mm) shafted 850 type motor have they?. I'm thinking out of turn here because I've no idea whether you can turn 1/4" thread on 1/4" stock or whether it has to be bigger. :-)
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John W E

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Re: Coupling
« Reply #10 on: April 02, 2021, 10:42:47 am »

As far as I know, motor shafts tend to be hardened steel - (something like silver steel) - and extremely difficult to put a thread on - unless its been annealed pre-hand. 


I have seen some motor shafts with threads on them, but, they tend to be of the larger sized motor e.g. 240 volts, something like 3 horse power industrial type motors.   I did a quick search on the model that DaveB has extracted the motors from, and, they look like the majority of people who built these models fitted something like the 500/600 style canned motors in them.


So, unless DaveB can come back and verify what motors they are, we are all guessing at the moment.


As far as the MFA olympic belt drive system is concerned, yes it is a 6mm thread on the end of the output shaft.   


John
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DaveB

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Re: Coupling
« Reply #11 on: April 04, 2021, 08:35:52 am »

Hi Everone
I'm sorry i sent everyone off on a tangent i should of explained about the motor being the belt drive  system. John had it right and many thanks for deciphering my question.
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dmh12345

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Re: Coupling
« Reply #12 on: April 16, 2021, 08:40:04 pm »

Not sure if I have done this correctly. Can anyone help with a coopling for a vintage diesel engine fire tender. Looks like 1/4"thread to prop then a ball with a pin through it at the other end. Apparently not made anymore:
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warspite

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Re: Coupling
« Reply #13 on: April 17, 2021, 11:57:10 am »

Is that not a dog coupling, the ball with a pin through it ( there should be a mating part on the motor) this type allows misalignment but by only a marginal amount
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