Pipe and Bolt Engine Mod-Up

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RussellT:
Hi Steve

I feel your pain. It is the nature of machining stuff that parts are often ruined when they're nearly finished. :med:

As an aside I've run out of round nails - I'm trying to imagine what they'll say when I go down to the shop with a micrometer - probably something similar to what they say when you start querying the wall thickness of their pipe fittings.

--- Quote from: vtsteam on January 26, 2015, 11:25:16 AM ---I think the challenge is going to be maintaining steam (or air) tightness around the screw threads

--- End quote ---

Did I not mention that it's designed to leak and work as an air bearing as well? :lol: More seriously that's why I chose a fine thread bolt.

Once I'd had the idea for this engine then I thought it had to be tried, but the closer that gets the more doubts I have about whether it will work.

Russell

shipto:

--- Quote from: vtsteam on January 26, 2015, 11:49:55 AM ---Shipto, don't stop now, man.....

--- End quote ---
Was only joking I am finding it fun to work around the problems.

vtsteam:

--- Quote from: RussellT on January 26, 2015, 01:11:13 PM ---Hi Steve

I feel your pain. It is the nature of machining stuff that parts are often ruined when they're nearly finished. :med:

As an aside I've run out of round nails - I'm trying to imagine what they'll say when I go down to the shop with a micrometer - probably something similar to what they say when you start querying the wall thickness of their pipe fittings.

--- Quote from: vtsteam on January 26, 2015, 11:25:16 AM ---I think the challenge is going to be maintaining steam (or air) tightness around the screw threads

--- End quote ---
Did I not mention that it's designed to leak and work as an air bearing as well? :lol:

--- End quote ---

I like it!!! :lol: :lol:

You know, might not entirely be a joke -- it might just be a little faster because of it... fun not knowing what will happen in advance..!: :thumbup: :beer:

Shipto, :thumbup: :thumbup: :thumbup: :thumbup: :thumbup: :beer:

awemawson:
Sorry to hear of your pipe cap problems Steve. Would you not do better to use a (larger) pipe plug of the solid variety? Such as:

https://www.fastenal.com/web/products/details/4203559

Bet you wish the rules let you use a bit of iron bar :ddb:

vtsteam:
It would have been Andrew, but I didn't know it wouldn't work at the time I bought them. The earlier cap wasn't cored out the same and had enough meat. Different manufacturer, I guess.

It was borne out today -- stopped at another hardware store further out of town while stocking up on kerosene and LP gas for the storm. Bought a couple more 3/8" pipe caps, and indeed they weren't relieved behind the threaded portion.

I also wanted to get rid of chatter, and had an idea on that score. When I got home, I switched the 3 jaw spindle for my milling spindle which has a 5/8" socket and 2 set screws. Then I turned the unthreaded end of a piece of 3/8" (nominal) pipe nipple to 5/8" to fit the socket. This gave a sort of 'collet chuck" and arbor to mount the pipe cap on, with much less overhang and weight than the 3 jaw had.

The turning went really well this time -- no chatter and these newer pipe caps were nice soft grey iron -- cut like butter. So that seems to have been the problem before -- bad pipe caps -- for engine building purposes at least! I might go back and by some more of those caps next time I'm in the area. They were only $1.79 each. Cheap for a piston.

The storm has held off so far this evening, so I was able to drill the new piston for a wrist pin. I used bit of brazing rod for that, and a few minutes ago was turning the crankshaft and watching the piston move up and down. Fun! :ddb:

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