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Old 08-02-2010, 09:09 AM   #1
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Default Moteur Oscillant double effet

his is going to be a batch build of a very good French design of a twin cylinder double acting revering verticle engine, these engines build up into a powerful engine that have many applications.

The drawing are available free her http://jpduval.free.fr/Plans_moteurs_vapeur_p1.htm

Its important with a batch build to keep the parts the same size as best you can, this way you can use stops to allow quick set ups.

First up the cylinders.

I dropped on a bit of brass bar at the scrappy that was close to size, so first job rough cut the to length and fly cut the section to size.



Then using the Keats angle plate, face them all off to same length.



Then on one cylinder only drill a nice deep centre for the bore position.



Now the next bit is where the Keats comes into its own, if I was just making one I could have used a independant four jaw chuck and picked up the bore position with a clock, but as I'm doing more than one this would have been a pain.

Clamps the cylinder in the Keats and with the Keats loose on the face plate, wind a centre tight into the cylinder, this pulls the bore onto the centre line of the lathe, clamp the Keats tight to the face plate.



The parallel on the face plate is their to stop the Keats slipping and to act as a counterbalance.

Thats it all you have to do is drill a ream change to next cylinder repeat, repeat,



This lost took just over an hour.



To position the rest of the holes in the cylinders, just use your vice stop so when you've got one positioned just keep changing them round until all are done change position for next hole repeat repeat, where required the holes were tapped using my tapping stand.



For the end cap holes that are on a PCD and positional relationship to the air ports I made jig, that had a small dowel that located in the air port, this is it in use.



And with a finished cylinder.



Stew




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Old 08-02-2010, 10:22 AM   #2
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Default Re: Moteur Oscillant double effet

Stew,

I am very impressed.

I'm not sure I could build one of these since I don't read French.

I'll be watching closely.

SAM



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Old 08-02-2010, 11:02 AM   #3
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Default Re: Moteur Oscillant double effet

Sam,

You don't really need to be able to read French, as long as you can work in metric or convert to imperial.

Just by looking at the French words, you can usually get the gist of what material is in use, that goes the same for German plans as well.
I do speak both languages, but not very well, just enough to get me to where I want to go, to eat well, and to find somewhere to sleep and of course, a toilet, just the basics in life.

If you still can't do it, then you only have to ask.

These engines make a very powerful but compact engine to run on steam. I have made dozens of them, slightly modified to aid production and looks, just as Stew is doing.


John

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Old 08-02-2010, 04:37 PM   #4
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Default Re: Moteur Oscillant double effet

Sam Like John

I have just enough to get buy, you'd be suprized at to how many words are similar, and how easy it is to get you self understood with simple words and gestures, I can remember buying a cast iron frying pan from a market in France and wanted to ask if it was none stick, I just said teflon and the reply came back none, we've still got the pan.

Moteur Oscillant double effet is the French Name of the Engine just think of it as Motor Oscillating Double Acting badly spelt that way you will have no problem understanding it.

Being an English speaker helps a lot most people in europe have a smattering of English and love trying it out on a native speaker.

Stew



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Old 08-03-2010, 07:40 PM   #5
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Thanks Lads

I needed some shed time today to get over the stress of taking my 85 year old Dad his 87 year old sister and my 88 year old aunt out for a drive and a pub lunch all three are hard of hearing and wear hearing aids of sorts that never seem to work right, on top of that my Dads sister has a very strong scots accent. I spent the time repeating and translating the conversations that were crossing over and getting mixed up whilst trying to drive, answering the same question time and time again like:- where are we "Buxton", two minutes later where are we "Buxton", two minutes later where are we "Buxton" two minutes later where are we " F*****g New York"

:lol:

Any way back on topic

For drilling the holes in the cylinders and keeping them all the same depth I fitted little sleeves over the drills to act as depth stops, for the smaller drill I glued the sleeves in place for the larger one a slit the sleeves and pinched the slit in slightly, to keep them in place at the set depth. You put the drill in the chuck so that the sleeve is hard up against its jaws and tighten up on the drill shank, you then simply drill the hole as far as the sleeve and thats it all the holes are the same depth.

This will give you the idea.



Next job I made a start on the crank webs, the drawing calls for two webs but I'm doing the build with three webs per engine this is one of Johns design improvements to give a more positive power take off.

Skim down a length of brass bar to 28mm and then slice off 6 mm wide discs.



I'm using a 1/16" part off blade to reduce wastage, I didn't part off all the way the last 1/8 I finished off with a small hack saw this way the disc wouldn't get trapped by the centre.

Next face off one side flip over and face to 5mm thickness, using a round nosed tool this gives a nice finish, when doing a batch try and get a real good finish off the machine this cuts down on post machining polishing.



Set up again and centre drill them rough drill and ream 4mm with a machine reamer, its not important for the hole to be concentric with the OD most of the OD will be chopped away, the critical feature is the hole centres for the crank off set, which will be tomorrows job.

Her we are doing the last one with the rest threaded on a bit of 4mm bar.



Stew

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Old 08-07-2010, 03:29 PM   #6
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Default Re: Moteur Oscillant double effet

Next op with the crank webs drill the off set holes, there will be two types 7 with one off set for the power take off and 14 with two off set for the engine crank.

First turn a mandrel with a nice fitting location diameter and a short length threaded M4, and a deep centre in the end

Then over onto the mill grip the mandrel in a chuck and with the chuck loose on the table wind a centre down tight into the centre in the mandrel, clamp the chuck firmly to the able thats it the mandrel is now accurately centered under the mill, zero your dials and off set 10mm.



Drill first off set hole 4mm in all the webs.



Put 7 aside then off set 10mm the other way and drill a four mill hole in the mandrel to take a pin, then using the first hole drilled in the web and a peg use this to locate for the second hole.



Drill the remaining webs with a 2mm hole.

Here they are all done with the mandrel



Stew

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Old 08-07-2010, 05:10 PM   #7
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Default Re: Moteur Oscillant double effet

I opened the link and had a look at all the French plans. There is some majorly good stuff on there. Some very, very powerfull twin and quad double acting oscillators. The French language is minimal. The fact that the dimensions are metric really isn't a problem for me.----Brian

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Old 08-08-2010, 06:56 AM   #8
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Default Re: Moteur Oscillant double effet

Stew

You are working through this nicely and your use of jigs is interesting. As it has 4 hole fixing for the cylinder heads I assume its this one you are doing, with Johns mods



and my attempt



I didn't find understanding French an issue either, drawings tend to be a common language.

Pete

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Old 08-08-2010, 08:48 PM   #9
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Default Re: Moteur Oscillant double effet

Hi Pete

I'm doing the verticle one with Johns mods, John has loaned me the Horizontal one for a guide, I have had it on air a couple of times and as you can expect from anything John has built it runs absolutly fantastic as smoothe as silk.

As for the use of jigs I worked in a industry that had very long production runs of products, everything was jig and tooled up to maximise output and efficiency, its something I just can't get out of the habbit of, but I do try and keep them as simple as posible, ther's no sence in taking three days to make a jig for a job that would take 1/2 a day to machine without it.

Stew

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Old 08-09-2010, 07:08 AM   #10
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Default Re: Moteur Oscillant double effet

Stew

Its a nice engine and mine runs nice and smoothly now as well. No doubt Johns just purrs.

I'm watching the thread with interest for tips on the way I should have done it, especially the main pillar as I did mine within days of my mill arriving. A case of learning on the job.

Pete




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