Author Topic: engine for deal sawing machine  (Read 330 times)

Offline mike mott

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engine for deal sawing machine
« on: August 04, 2019, 06:03:57 PM »
Just like a number of other folk on this forum I am guilty of the same thing! more than one project.

After looking at the drawings i have yesterday of other things I began wondering what the innards of the Deal sawing machine engine looked like and since i dont have a drawing other that the three views I showed in the old plate.

here is a conjectural scheme I have started of the valve mechanism at a scale of 1 1/2 inches to the foot the valve travel appears to be .347" and the cylinder bore I am thinking is around 1" and a stroke of 2"



and without the old section



I am wondering about the valve slide size, and would like to here what the members who are knowledgeable in this area think. as I think it would make for an interesting model.

Mike
« Last Edit: August 04, 2019, 06:11:49 PM by mike mott »
If you can imagine it you can build it

Offline crueby

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Re: engine for deal sawing machine
« Reply #1 on: August 04, 2019, 07:23:34 PM »
Hi Mike,
That would be a great project!
I have a couple of short write-ups that I collected several years back on valve port proportions, they are attached to this post, some good rules of thumb in them for standard d-valves.

Did a search on that machine, have you seen the writeup it has in the Appletons Dictionary? Starts on page 336, same plates as you show but with details in text.

https://books.google.com/books?id=H3wt6nG0wooC&pg=PA336&lpg=PA336&dq=%22macdowall%22+steam+powered+sawing+machine&source=bl&ots=VxZMq1Q3AC&sig=ACfU3U161VPuq8z7H91UfosYmcrZnnal8A&hl=en&sa=X&ved=2ahUKEwjDhaig7enjAhXkqFkKHZ1CDYIQ6AEwCnoECDAQAQ#v=onepage&q=%22macdowall%22%20steam%20powered%20sawing%20machine&f=false

Chris

« Last Edit: August 04, 2019, 07:45:08 PM by crueby »

Offline mike mott

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Re: engine for deal sawing machine
« Reply #2 on: August 05, 2019, 06:17:41 PM »
Hi Chris, thank you for the links I shall read through it all before proceeding. The write ups on the D valves looks to be interesting I have the stuff that Martin Evans wrote in his Book Locomotive Valve gears. The one you linked to seems to be more comprehensive for the theory part.

Good bedtime reading.

Mike
If you can imagine it you can build it

Offline doubletop

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Re: engine for deal sawing machine
« Reply #3 on: August 20, 2019, 08:34:25 AM »
Mike

Check out Don Ashton's web page. http://www.donashton.co.uk/ he's a bit of a guru on this subject.

Dons book available here https://www.camdenmin.co.uk/search?q=ashton

Then try the Dockstader simulations http://www.billp.org/Dockstader/ValveGear.html

or the Wallace simulator http://www.avocetconsulting.com.au/modeleng/

Plenty to keep you occupied for a while?

Pete
?To achieve anything in this game, you must be prepared to dabble on the boundary of disaster.? - Stirling Moss