Machining In Your Workshop Special

[David Clark 13Participant @davidclark13]

[David Clark 13Participant @davidclark13]

Hi There

Finally finished the machining of a Blackgates Vee twin oscillating engine.

This Special has a fully detailed article about how I built this engine.

The article comprises 160 photos showing most of the machining setups used.

It was made on a Myford lathe and Tom Senior mill.

 

You can order this special from MyHobbyStore.

 

[Cornish JackParticipant @cornishjack]

Splendid!! Have had a set of castings lurking in the ‘to do’ pile for some time.

HOWEVER … Although I can log in here, when I try to order a copy the required log in FAILS with an ‘incorrect password’ box!! “Curiouser and curiouser “, said Alice.

[Engine BuilderParticipant @enginebuilder]

You need to create an account for myhobbystore. Your password for the ME site will not work.

[Sub MandrelParticipant @submandrel]

Great stuff David,

 

But does it work

 

Neil

[David Clark 13Participant @davidclark13]

Hi There

Not yet, Nearly ready to test. Need a couple of o rings.

Gave up trying to fit the graphited string. Everything is free and it turns well.

Happy with the machining operations. Will add an ‘I would do this differently next time’ box at the end of the article. This is only dimensionally, not machining.

Under pressure to finish writing it up so it can go to press. Will have more time to play next weekend. Hope to put it into the loan section at Sandown.

regards David

[Cornish JackParticipant @cornishjack]

Ah ha!!, thank you, Engine builder

Foolishly thought that  having a link to the thing on here would make access straightforward.

Methinks Alice was right!!

[John OlsenParticipant @johnolsen79199]

Never mind the O rings, if you put enough air on it the leaks won’t matter! Remember they will more clearance on a job like this too.

 

I think graphited yarn is to make you feel like you have tried rather than to actually acheive much. Bit like the Dunstall muffler on my old Triumph, you were supposed to wrap the inner perforated tube with fibrelass to absorb the sound, but whenever I checked there was never any in there. Didn’t take long after repacking for the crackle to come back in the exhaust either.

 

 

I saw an interesting variation on the oscillating idea this weekend, a little three cylinder radial, with fixed cylinders, and little valves pivoted at much the same place as the cylinder would have been, and using a fork onto the crankpin to operate them. Gives the same sort of timing. Downside is the steam (and exhaust ) connections have to be flexible, since the connection is directly onto the moving part of the valve. With a bit of ingenuity I’m sure that expedient could be avoided.

 

regards

John

 

 

[Sub MandrelParticipant @submandrel]

Bit like the Dunstall muffler on my old Triumph, you were supposed to wrap the inner perforated tube with fibrelass to absorb the sound, but whenever I checked there was never any in there.

 

My wife thought a poor cat  had been sucked into her Vectra’s exhaust – it turned out to be fibreglass blowing out of it. I tried driving it and every so often you would lose power, then there would be a pop and it started working OK again.

 

Neil

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