Moteur oscillant double effect

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sbwhart:
Nice bit of kit their Dave to big for my shed though.

I've got a stool like that in my shed, but I'm not a hard nut.

Spent a bit of time making the jig to drill the holes in this gland thingy

Here we are with a drilled part.

Thought I'd point out a few design features of the jig.

The base is relieved so that it sits flat.

The plain diameter clears the job to give the drill guide location thats concentric with the job.

Make sure you can hold the jig safely, my first attempt was made with a noggin of steel from my scrap box than I realized my fingers would be close to the drill as it came through the job, I thought Ill just after be careful, but then thought my time would be less painfully used making a new one than waiting in the ER room.

Stew

madjackghengis:
Nice work there, Stew but if you don't leave some blood on it, how will forensics ever know they are your engines? From the way your log is going, I should get on the same project myself, and have a pile of small engines to pass around at Christmas for all and sundry. I'm really looking forward to seeing them together and all running at the same time. Beautiful work aided by well made jigs, they definitely make the difference in this build. :thumbup: :bow: mad jack

Dean W:
Neat thread, Stew. Took me a few days to catch up, as I came in late. Glad I got to it!
Lots of neat parts and neat machining tips. You run a good show!

Dean

sbwhart:
Thanks Jack/Dean

Jack I try to keep the red stuff off the floor :D

To finish this part off

Mount back stop in the head stock and face to length turn register to 10mm dia*1mm length, then using the two wire trick mill the flats for a nice match on the cylinder.

Here they are with one in place and studs in place that will take the gland seal.

Now for the other end, this cap is only 3.5mm thick with no through centre hole so its not to easy to jig up, time for another approach:- Turn 17mm dia, a goodly length, enough to make all the caps plus a bit. Then over to the mill, using the PCD feature of the DRO drill the holes full depth of the drill.

Back to the lathe turn up 10 mm register and part off, repeat repeat repeat, until no more holes left then back onto the mill drill four more holes full depth of drill again back to lathe etc etc, I got 7 parts out of each cycle so it was nice and quick.

Then mill the flats as before, and her we are all finished.

Getting a good collection of parts still quite a few to go though.

Stew

sbwhart:
:nrocks:

I've not done an update on this for over a week, reasons being a short holiday, domestic duties, and I was beginning to repeat myself, lot of the bits required similar techniques with stops etc, so I just got on with making bits until something interesting came along.

The rotary valve is the interesting bit :D

I've gone away from the drawing with this one because John tipped be off that the drawing put the arm in a awkward position, and he added a stop to the movement.

The first job was to drill and part off some brass, then mill a 5.5mm slot across the middle.

This slot becomes the reference feature for the position of the air ports, so to get this location correct I first turned up a mandrel and with this on the rotary table milled a location key in it for the slot.

Like this

The valve was then fastened to it and using the rotary table and a 2mm slot drill the ports and the stop slot milled.

When using a rotary table its all to easy to get lost, so with a soft pencil I mark the degrease on the scale I want to work too.

Her they are with the crib sheet I used.

And here's a box of bits.

I've got enough bits to do a trial assembly to see how it all fits:- The base and take off is from Johns spare box.

I'm going to have to do a bit of bling work soon.

This job is going on the back burner for a couple of days, its the club Gala next week (18th Sept) so I want to see if I can get my boiler finished and some of my model polished up to add to the show, if any of you Guys live in the South Cheshire area the club is located between Crewe and Nantwich behind the Peacock Pub, if you want to drop in and have a look round and a ride on one of the locos.

Stew

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