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Yes Paul - I had realised what I was missing in understanding what gap you were talking about! Now my query on your method is reduced to what rational governs the size of the uncompressed ring gap you cut in the mill before the final OD and ID are machined. Since I first read your first post I...

Ha ha Andrew - you spotted my deliberate mistake, what was I thinking of? So that would make the gap about 20 thou/inch dia - which doesn't sound enough, do you not think? Chris

Andrew - it was an approximation from your statement that the gap of a 3/4"ring was cut with a 1/64" slitting saw (before heat treatment); 1/64" is very roughly 30 thou, so 30 thou on 3/4" dia equates roughly to 40 thou/inch dia. Remember I am looking for what gap to cut the rings before the...

Having re-read the thread all through, I see Paul says the gap to machine is the same as for the heat treat Trimble method, which I can understand and helps answer my original query - I was missing something! - but what sort of gap is that/inch of bore, 40-60-80-100 thou? Andrew's 1/64" for a...

Hi Paul, I like your method of making piston rings but have a query which may sound stupid - how do you mill the gap in the rings? I am definitely missing something here. Where I'm coming from is say the bore is 1 inch dia then the ring gap is going to be in the order of 0.003". I have no way...

Hi Petertha, the touble with available books on TurboCad is that they are generally written for the Windows version which is different from the Mac version. I have asked the question on how different from my supplier and waiting an answer back. Your advices however are very kind and has given...

Sorry - when I said a Microsoft product I meant a product that can only run on Microsoft and not on an Apple OS. Similar, but not exactly the same. I appreciate that 3D starts out as 2D and then gets "expanded", for want of a better word, but folks swear by designing in 3D so every part all...

Hi - I have a MacBook Pro and use Turbo Cad Mac Deluxe V.11 I learned "Engineering Drawing", as it was then called, 60+ years ago and my CAD drawings skills are basically the same as 60+ years ago applied to a computer package. I am happy doing 2D CAD work, no worries there. There is much...

Hi Chris - I am another Chris from Somerset, other side of Yeovil to you, so not too far from Frome either. When I can I am trying to complete a 3 cyl radial aero engine, I bought it 3/4 completed from a friend of a modelmaker who was selling it on behalf of his friends widow, his friend having...

Been retired 12+ years - as other folks have said, don't know how I ever found the time to go to work. Being old brings health issues it's true, but it also means when you want to go and play you can, providing Senior Managements says so of course. My SWMBO says she never stops me going to my...

Quite agree bobden72 - I think tomitore45 felt that way too which is why he said he was bailing out................... Some people eh?!

The OP gave a lot of info before the question, that basically just said where he was coming from. Nothing more. It wasn't an invite for comment. The solitary question at the end was what needed, and gave an invite to give, a comment, or answer, on and thats what most seemed not to have...

mattb.351 - I missed it because post 3 quoted wikipedia rather than saying yep, I measured it and this is what I got! Which is what the OP asked, and only what he asked. All the rest of the comments/posts drowned out the answer. It seemed obvious to me from the long OP intro that he knew what...

The OP asked just the question: "Now to the question: Has any one ACTUALLY measured the voltage and current on a properly working, capable to start the engine, plug powered by a middle of the charge stick or single cell NiCd?" I see nothing wrong in asking that, on the basis that no question...

Jenny - really sorry to hear about your back problems, not good news at all, but you have undoubtably done the right thing for the right reason even if it doesn't seem like it right now. So sad. And there was me looking forward to your three legged Anzani radial engine build ! Take care, Chris

I have the book but I also find the website www.homews.co.uk invaluable. As Frazer says, the Grinding Rest Table write up on the website is excellent (and free!) and includes drawings last time I looked, plus there are all sorts of other interesting items there too. Well worth the look Chris

I started my engineering using a slide rule, became very quick with it too and loved using it. However, then I didn't need to use it so much and accidentally left it on a ship and lost it for ever and then calculators came along and that was that. I have one of my dads slide rules, but have...

I'm going to be following this thread along because partly it's an interesting engine being a radial sleeve valve engine, partly because undoubtably I will learn a lot (already found how to make spark plugs!) and partly because it's really quite an ambitious project build, so there will be some...

Thanks for your kind words Jenny. Am impressed with your software capability and knowledge, to me it's a black art; as a mechanical guy I am also always suspicious of anything with wires coming out of it! Yes, electronic stuff from the Far East does seem very inexpensive, how they do it for...

Having just come across this thread read it with interest as I had a similar problem. With a lathe driven by a 3ph motor controlled by a VFD fitted with a variable resistor giving outputs set from 10 to 70 Hz available at a twiddle of the fingers and a belt variator incorporated within the belt...