Author Topic: A Tandem Compound Mill Engine  (Read 22614 times)

Offline Admiral_dk

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Re: A Tandem Compound Mill Engine
« Reply #180 on: February 22, 2023, 12:25:48 PM »
Another part ticked of the list  :ThumbsUp: and I'm sure you will apreciate it later, that you used a lefthand thread in one end - as it give infinite adjustability without disassembly  :cheers:

Per

Offline vtsteam

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Re: A Tandem Compound Mill Engine
« Reply #181 on: February 22, 2023, 03:00:47 PM »
Fine looking parts, and great to see a filing button used to help make them! A love to see traditional hand work methods, and their results. :ThumbsUp: :ThumbsUp: :popcorn: :popcorn: :cheers:
Steve

Offline cnr6400

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Re: A Tandem Compound Mill Engine
« Reply #182 on: February 23, 2023, 12:24:44 AM »
 :ThumbsUp: :ThumbsUp: :ThumbsUp: :popcorn: :popcorn: :popcorn:
"I've cut that stock three times, and it's still too short!"

Offline ettingtonliam

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Re: A Tandem Compound Mill Engine
« Reply #183 on: February 23, 2023, 03:25:45 PM »
Another method I've used when I didn't have a suitable left hand tap/die, was to cut one end 40 TPI and the other end 32TPI, so turning the rod gave a differential adjustment between the ends of approx 5 thou.

Offline steamer

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Re: A Tandem Compound Mill Engine
« Reply #184 on: February 24, 2023, 12:17:44 AM »
It's coming along swimmingly!

Dave
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Damned ijjit!

Offline deltatango

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Re: A Tandem Compound Mill Engine
« Reply #185 on: February 24, 2023, 04:50:44 AM »
Thanks for looking in, everyone!

The adjustment of the valve gear is likely to be tricky enough without having to dismantle everything to change the length of links. The use of different threads on each end is a new idea for me - thanks. In this case though I may need a couple of mm of adjustment.

On the original drawings the ends of the rod ends were left square across, but this looked a bit crude, so I rounded them off. This is one place where I think it is easier (and more satisfying) to use hand methods, the time taken to set up the rotary table etc. etc. just doesn't seem worth it.

David
Don't die wondering!

 

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