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Home Model Engine Machinist > Building Them > Plans > Can I scale up the John-Tom Poppin plan

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Old 02-10-2018, 09:37 PM   #11
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Frazer,

Glad to be of use to someone

John


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Old 02-12-2018, 08:58 PM   #12
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Quote:
Originally Posted by Blogwitch View Post
Frazer,

Glad to be of use to someone

John
John, I had to look it up, but I knew there was a phrase to describe your comment...self-deprecating.
Come on man, I always appreciate your posts.


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Old 02-13-2018, 10:59 PM   #13
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R,
Most probably because I haven't actually shown any build posts for a long time, and relying on my very poor memory and my archive to answer questions.

But all is not lost, I had two very good friends come over last weekend and they managed to get lots of heavy stuff moved out of my shop into storage boxes, allowing me to actually get into my shop without falling over, so expect me to start doing things soon.

I only have a month of radiography and then I should be given the go ahead by the medicoes...

John
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Old 02-14-2018, 01:13 AM   #14
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First John, it's good news to hear, secondly I've read quite a lot of your previous posts and have learned a lot from them so really please don't beat on yourself like that. Thirdly I'm looking forward to travelling down to your shop sometime this year so you can show me the ropes first hand how to turn a a few lumps of different metals into a beautifully crafted machine fit for a king all in good time of course.

I have to say though veering back to the topic, that I find this thread amusing in that I recently came across the poppin plans and was wondering how to go about scaling these type of engines. The twin flywheels of the poppin appeal to me
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Old 02-14-2018, 01:46 AM   #15
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You say you cringe at the thought of the 2 56 tapped holes, I'd say just use 8BA as there not far off the same size, and they are just been used for fixings as opposed to a critical thread type as used on steam fittings. There also more likely to be in your toolbox
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Old 02-14-2018, 11:02 AM   #16
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Thats good news John,
Why not use 2mm sized bolts much cheapness and easily available in Europe. I think I used 10BA on my Poppins as youre tapping cast iron its not to difficult
One mod I make when building Poppin or any similar engine is to spigot the cylinder into the frame just save faffing about getting the location right
cheers


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