Blackgates Twin, machining the standard

Blackgates Twin, machining the standard

This topic has 3 replies, 3 voices, and was last updated 19 October 2024 at 14:40 by Benedict White.

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19 October 2024 at 12:30 #760166
Benedict White
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@benedictwhite51126
I was at the Midlands model engineering exhibition yesterday and bought the last Blackgates twin from there.

Having got it home, I am looking at the standard, thinking about the best way to machine it. It looks like they, in their machined kits, did it on the lathe presumably in a 4 jaw chuck.

Is that what people have done?

If so, was it the first operation or did you square the base first to take the casting taper off first?

Also, I presume that prior to putting it in the 4 jaw chuck you need to find the centre if the crank journal so as to drill and ream it to make sure the crank runs at 90 degrees to the port faces?
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19 October 2024 at 13:13 #760180
Frank Gorse
Participant
@frankgorse
If you look at ‘Model Engine Maker’ website and search for ‘twin oscillators’ there’s a long correspondence that will answer all your questions and more. Sorry I don’t know how to do a link.
19 October 2024 at 13:26 #760186
Ramon Wilson
Participant
@ramonwilson3
Hello Benedict,

Several years ago I rebuilt an example of the Blackgates Oscillator from a previiously poorly made example. I described this on Model Boat Mayhem here https://www.modelboatmayhem.co.uk/forum/index.php/topic,53472.msg553724.html#msg553724

You may feel that the info helps you as the machining ops are described

Hope it helps – Tug
19 October 2024 at 14:40 #760197
Benedict White
Participant
@benedictwhite51126
Many thanks Frank and Ramon, very helpful.

The link to the “Model Engine Maker” thread is here, and covers both the Blackgates and Stuart osciltors where you can turn the Blackgates standard and and Blackgates and Stuart cylinders in the lathe.
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