a Jerry Howell "duplex vacuum" stirling engine build

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saw:
Nice :thumbup:

DaveH:
Very nice :clap: :clap: :clap:
:beer:
DaveH

madjackghengis:
Well, I haven't got a lot done since last time, but thought I'd better get it down while I can. I took the marked out stanchion and put it in the mill vise, to use a milling cutter to hand trace the lines of the stanchion.

it worked, but left lots of swarf, and lots of room for improvement, so I traced it onto the other stanchion and used my bandsaw to cut to the line, it needed some odd work, cutting, turning it over to see the lines and back at it again, and the two sides are close to the same, close enough for the filer.

here is the one side as I used to scribe the other side, having to scribe on the flat side, with the pointy side being down for working on the saw.

bolted together with pins to get the alignment, and screws sticking down to keep it parallel with the filing machine table.

I didn't like the way the file fit, it wasn't straight but skewed a bit, so I removed to cap/screw holder and opened the hole in it up for the file to seat against the shaft as it should.

cleaned some of the filings off while it was open, just to lighten it up a bit.

back together working much better. if the file is not going dead up and down, it pushes the work away, as well as putting a slope on the edge, it cuts much faster with the file in line with the shaft.

with a bit of copper to keep the vise from putting a flat on the top, the two stanchions are in the milling vise for a much needed hole to open up and give some air to the framework.

ready to drill a hole through both stanchions

here is the hole, had to move it around a bit as the pilot hole was not well centered, so I did the final hole with a 3/4 in end mill

With that, it is time to finagle room for screw heads when there isn't any, so I used my drill/driver, a counterbore bit for #10, went in at an angle, and moved it up to vertical while spraying it with WD-40, doing it for all four holes. The large hole in the center was needed to minimize the amount of flesh that had to be removed for the one pair of screw heads. From here, it got washed, about an hour with a roll of 320 grit paper, used to clean up the filing machine lines, and will end with 600 then polished, when all is running.

twisting the driver into vertical to get the head clearance needed

screwed to the top of the cylinder, looks like just a bit more and the stanchions will be done

another view of the stanchions, just need to round off the back ends, to follow the curve of the cylinder, and debur, and then on to more parts. That's it for now, but should be getting to the lapping part soon, just need to find the right soft tissue to use for a lap, plastic, wood, something to take the paste as it's only brass to be lapped. thanks for watching, and for all the comments and ideas, cheers, :beer: mad jack

saw:
Wow it's looking realy good :D

Dean W:
Looking great, Jack! Another Mothers fan, I see.. :thumbup:

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