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Author Topic: Farish worm gear spacing - help needed  (Read 1028 times)

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Online Snowwolflair

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Farish worm gear spacing - help needed
« on: February 24, 2020, 03:42:43 PM »
Does anyone know the distance between the axle centres and the motor centre on a classic pool Farish locomotive.

 It has to be around 6.5mm but as I am making a gearbox it would great to be sure.

Can anyone help?




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Re: Farish worm gear spacing - help needed
« Reply #1 on: February 24, 2020, 06:46:09 PM »
I'm having a play to see if it is possible to convert an old Farish loco with a coreless motor.




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Re: Farish worm gear spacing - help needed
« Reply #2 on: February 24, 2020, 08:32:35 PM »
I'm having a play to see if it is possible to convert an old Farish loco with a coreless motor.




A great idea. I'd be interested in buying at least one if it's 3D printed.
How would the rear of the motor be fixed to the chassis?

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Re: Farish worm gear spacing - help needed
« Reply #3 on: February 24, 2020, 09:18:45 PM »
Once i'm happy with the shape and prove it works I will list it on Shapeways.  I need to do it that way as it will need to be a polythene type plastic which Shapeways do.  Looks like 7-8 a unit but i'm removing mass so that might go down.

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Re: Farish worm gear spacing - help needed
« Reply #4 on: February 24, 2020, 09:34:53 PM »
@Dr Al  would be the holy grail on this..



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Re: Farish worm gear spacing - help needed
« Reply #5 on: February 24, 2020, 09:44:44 PM »
@Dr Al  would be the holy grail on this..

Sir Gawain surely  :)

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Re: Farish worm gear spacing - help needed
« Reply #6 on: February 24, 2020, 09:50:26 PM »
Cutting away the unnecessary plastic it looks better.

Shapeways are indicating about 5.50




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Re: Farish worm gear spacing - help needed
« Reply #7 on: February 25, 2020, 12:11:09 AM »
And removing that extra bulk will maybe leave more space for a dcc decoder, which will be much easier to fit with a motor that is isolated from the chassis.

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Re: Farish worm gear spacing - help needed
« Reply #8 on: February 25, 2020, 12:21:21 AM »
Almost there with the shape. I need to pick up the tube adaptor to fit the worm gear and test it next so I can make the final adjustments.

Yes, it will be possible to hand trim it further to get a DCC chip in if its tight.



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Re: Farish worm gear spacing - help needed
« Reply #9 on: February 25, 2020, 12:39:26 AM »
The other option is to print in bronzed steel.  At 15 from Shapewys the extra weight might be worth it on a DCC 0-6-0 but the screw fixing would need to be insulated with a plastic tophat.

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Re: Farish worm gear spacing - help needed
« Reply #10 on: February 25, 2020, 08:41:41 AM »
 Looking very good! I might well consider that for converting some of my locos.

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Re: Farish worm gear spacing - help needed
« Reply #11 on: February 25, 2020, 05:39:53 PM »
These videos used a print straight out of the printer without any modification.




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Coreless replacement motor for Farish early chassis
« Reply #12 on: February 25, 2020, 09:59:14 PM »
Very sweet, not had a Farish loco of this era behave this well under DCC and very little noise.


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Re: Farish worm gear spacing - help needed
« Reply #13 on: February 25, 2020, 10:17:19 PM »
I have ordered up some sample parts in various materials and finishes from Shapeways to see what will give the best results.  This will take a few weeks and in the interim I'm going to convert a number of my white metal kit built models all which labour under poof Farish motors.

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Re: Farish worm gear spacing - help needed
« Reply #14 on: February 25, 2020, 11:15:37 PM »
The other option is to print in bronzed steel.  At 15 from Shapewys the extra weight might be worth it on a DCC 0-6-0 but the screw fixing would need to be insulated with a plastic tophat.
Hopefully we're talking about the Farish motor which was used in the nearly all the later Poole locos and the revised Chinese locos not just 0-6-0s
Ian

 

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