Potty Popcorn Engine

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sbwhart:
Before milling the guide out I had a little corrective work to do, when I did the lose assembly I found that the nuts on the cylinder cover stopped the guide sitting down, so I set it back up in the lathe and cut the 24mm dia 2mm deeper.

To Mill out

First up I blued the guide up and using the spin-idexer marked it out, and cross hatched the bits to cut away.

Milling it out doesn't call for exact presision, you're trying to get a neat visual effect, the origonals were cast so they would have had inperfections.

On the mill first mill across the end keeping it short of the corner, this is so I would have room to run the cutter and take advatage of the horizontal power feed,.

Then mill down to the line.

Using a 14mm dia ball nosed cutter clean out the corner.

Now I had a nice flat platform to sit on to do the other side.

I swung the vice round 90 deg again so I could take advatage of the power feed, and milled out 68mm gap. For some time I was trying to figure out the best way to grip the job to machine the 10mm wide support, that bolts to the bearing stand, whilst doing this op I realised that the solution was stearing me in the face, all I had to do was mill into the the edge until it cut through into the bore.

So that you have this.

It is now a simple matter to use an hack saw to finish the job off.

1/2 hr work with files to blend every thing in and you have this.

Its not quite finished yet I'm unshure how the crank will clear the end of the Guid I may have to but a dog leg bend in it, I'm going to leave this untill I've got more bits arround me.

I didn't quite get the depth of some of the drilled holes correct I was short from both ends with both the 20mm holes don't know what I did wrong probably a maths error. but it won't be any detriment in fact it will just mean the cross head will be supported over a longer distance.

Stew

madjackghengis:
That's some awful pretty work there, Stew, pretty complex and intricate, if I do say. I also thoroughly enjoyed the information sharing of all those chiming in about the soldering issues, I think that's one which needs lots of attention, as we each end up on different ends of the issue, and it's not all the same, but critical issues in some, and pretty clear and straight forward in others. Very nice work on the crosshead guide, looking much closer to a working engine. :jaw: :beer: Cheers, mad jack

Rob.Wilson:
:clap: :clap: :clap: i do like the way you made the trunk guide Stew .........clever ,,very clever :med:

Rob

Jasonb:
Looking good Stew, did you get any movement in the metal when you cut the side away as bright bar does have a tendancy to do things like that when you remove more from one side than the other?

J

sbwhart:
Thanks Jack/Rob/Jason.

Jason:- I was wondering about that also, just taken the part round to John's to borrow his spring bars to measure the bore but would you believe it he'd passed them on to a friend just the other week, so I'm going to measure them up using some small calipers its the only way I can reach in.

I'll pass the result on.

Stew

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