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P M Research No 4

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Ian McVickers12/07/2023 21:01:30
261 forum posts
117 photos

Hi all,

Ive finally managed to get my PM Research No 4 nearing completion and running on air.

Video here https://youtu.be/e2f2Lar4r8M

I still have drip feed oilers to make for the stand,probably similar to the other 2 and was also thinking about a lid for them.

This was definitely a challenge to machine especially the stand. I will probably put the flywheel back on the lathe and redo it as I`m not happy with the finish and see about improving it. There is also a bit of wobble on the fly wheel due to the crank not being perfect but I will blame it on it being in 5 pieces and a pain to get true.

JasonB13/07/2023 06:52:58
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25215 forum posts
3105 photos
1 articles

Looks to be running well. Regarding the crankshaft it is usual to make them from 4 pieces with the shaft full length and then cut out the middle of that once it has been assembled which helps keep the shaft straight.

Ian McVickers13/07/2023 18:02:39
261 forum posts
117 photos

Thanks Jason.

I assembled it as per the drawings and it was straight after assembly but isnt now. Its not out by much so maybe when I redo the flywheel I might attempt to straighten it out.

Just noticed the spelling mistake in the thread title, can this be fixed?

Blue Heeler21/07/2023 07:32:29
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342 forum posts

Very nice build of a No4.

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