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| Benji Builds a Stuart 10v (slowly) |
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| raynerd:
Great job Benji - it is coming along nicely! That is also good news that Jasonb has said about Harold Halls photos. His articles in ME was very helpful to my build so it is great he has put them on his website. Chris |
| benji:
Thanks for that tip with the bar Jason, I'll do that next time I machine a cylinder. Harold Hall's website is very useful, bigger pictures make things a lot clearer. His method of using jigs and fixtures is definitely helping me. Not much to report, ended up hunting for a coal hod on monday which seemed to eat into any "play" time I had set aside oh well... I have a question regarding the bottom cover, the drawing calls for a 5/32" reamed hole. I'm planning to make a d bit reamer from some 5/32" silver steel, does an initial hole of 3.9mm sound about right? seeing as I reckon 5/32" is 3.97mm and I only have metric drill bits. Mark |
| Bluechip:
What's a 'coal hod' ?? Use to see bricklayers with sort of 'boxes on poles' climbing ladders. No idea what a coal hod is though .. :scratch: Interesting engine .. I have a 9H set of castings aquired with the S7. Up in the roof space at the moment .... er ... maturing. Yes, thats what they're doing .. Dave BC |
| Jasonb:
I'd allow a bit more metal for removal so drill 3.7 or 3.8. You can also make a reamer from your silversteel, cut it diagonally across so the cut is about 4 times the dia long and then harden it. Rub the cut on a sharpening stone to hone it to a fine finish and then pass it through the hole with the lathe running at slow speed in this case I would drill 3.8 Jason |
| madjackghengis:
Hi Mark, looks like the build is going along pretty well, are you painting as you go? The initial bits assembled look like they're covered in wrinkle paint. The ports were a more important issue than the ends of the cylinder, but you can always make allowances with the valve and timing. IMHO, I'd say you could use the 3.9 drill, if you used a reamer such as described by Jason, they work well, but do prefer minimal metal removal. I'd say you've got it going along pretty well so far, all in all, of course we're all waiting with baited breath to see and hear it running. By the way Dave, what you're doing with your castings is called "seasoning", because all castings need to settle, and quit their adjusting to the conditions of earth after the heat of casting, it makes them more accurate and less liable to warping while machining. I suspect a "coal hod" is something you use to carry coal up a ladder so you can fill your stove or fireplace by dumping coal down the chimney. :poke: :lol: mad jack |
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