Moteur oscillant double effect

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Stilldrillin:
Very nicely done, again Stew. :clap:

Love your parts stash. Building an assembly line next? :thumbup:

Pity, your open day is a little far for me.......

David D

Brass_Machine:
Nice!

sbwhart:
Thanks again Guys

Well got this off the back shelf, and made a start on the piston,con rod, and big end assy.

I'm making the piston and big end out of ally bronze which has good wear properties.

First Job skim three lengths of bar down to 10mm the same size will do for the big ends. Ally bronze is not that easy to machine its very sticky and generates a lot of frictional heat, but John advised be to use a slower RPM, and it worked a treat.

The pistons were then drilled a tapped and parted off from one of these lengths.

I'm not making the big ends to the drawing I'm going to make them square more big end shape if you know what I mean

So over to the mill and with the spin indexer mill the 10mm bars to 7mm square.

At this point thing went wrong with the first bar I was planning to drill 4mm holes along the bar for the bearings but I had too much flex in the set up even with a centre and a jack under the bar the holes were coming out all shapes,

Plan B scrap the bar off turn and mill another one up, and drill them in the vice.

With a self centering four jaw in the lathe and using a bit of 4mm rod through one of the cross holes as a stop, face, turn step, drill and tap M3, not forgetting to drill a 1.5mm 3mm dia register hole, this will help pull the con rod concentric when its screwed home.

Remove the cross bar first before turning.

Check that I'd got the correct hole centre.

Whilst I'd got the spin indexer set up I fluted a couple of bars to make knobs out of for the displacement lubricator.

Her are the con rod ends finished and a couple of lose assemblies.

Last job of the day clean the pistons a rods and glue with thread lock, I'll leave them over night so I can make a start on turning the pistons to size in the morning.

Stew

Stilldrillin:
Nice to see you're back, and producing Stew! :thumbup:

David D

sbwhart:
Cheers Dave

Things have slowed down a bit on this job:-

It's amazing how a six month old rug rat can distract you enough to keep you out of the shed. :D

Any way finished off the pistons the only pic I took was of the set up to final turn the OD to size with a nice sharp honed tool.

Then I went on and knocked out the power take off bearing housings, nothing too interesting on these I've shown similar set ups before.

Now this will interest you:- the Base Plate.

This is made from brass sheet so first job cut seven out to rough size and stick them together with two way tape, and give the bundle a squeeze in the vice.

I then milled the two opposite long sides clean and parallel.

Then with the bundle clamped together as an insurance drill the four corner holes 3mm as each hole was drilled a stuck a m3 cap screw in it just in case things wanted to move.

Then bolted the plates together this make the bundle nice a secure for milling.

Then mill down the short edges to clean them to size

Then blue the job and mark out the cuts and the rest of the hole position.

Then chain drill 3.5mm.

Then connect the chain up with a 4mm slot drill.

I struggled to get them apart so put them in a cup of boiling water to soften the glue and cleaned them off with petrol.

That's it Job done.

Stew

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