Moteur oscillant double effect

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sbwhart:
This should solve the "Mystery of the Third Hole" Dave. That sound like a title for a B movie. :D

First job make the mandrel for the slitting saw. I like to make the washers at the same time this way they are custom made for the mandrell and work a lot better.

Her it is, along with the 1mm thick slitting saw I'm going to use John gave it to me a while a go its very good quality, thanks John.

You can see the benefit her of making the washers for it to give a good clamping area.

To set the webs up I used the two dowel method again to get it level, but this time as I've got to remove the dowels I only set up two webs at a time.

And her we are cutting through into the third hole.

That's it it took about 30 minutes to slit all 14.

This should show what the third hole is for, It's make the web into a pinch clamp to hold the journals in place.

Stew

Stilldrillin:
Pinch clamp Stew? Doh.... :doh:

Thanks! It all makes sense now..... ::)

Met a friend of yours, today....... :thumbup:

:D

David D

sbwhart:
Someones bin the Manchester Musium of Science and Industry, hope you enjoyed it Dave, did you catch them running the engines, I've bin a few times and only seen them running once, and thats when they were getting ready for a visit from "toby jug ears Charlie".

Made a start on the Standards, the drawing calls for 20mm square brass, I failed to find a supplier to sell me the small qty I wanted, most had a miniumum order qty of 500 kg, Macmoddels had 7/8" in stock and as its close I had a run out to collect it and save the postage.

Cut to length with a hack saw the bar end with the chamfer looked as though it might not clean up.

Then with a self centering four jaw and a back stop, face them all off to the same length.

The chamfer didn't clean off :bang: :bang: :bang: but it looks like it just might be fit for use after milling to size.

Using a fly cutter mill to 20mm square, to do this I first roughed two side to give a square of about 20.8, then set the mill to take a cut down to size, locked everything and at this setting skimmed the remaining sides to get all to the same size, I like to work on the + side so the sizee I have is 20.2.

The chamfer just left a slight witness this can be my keaper.

Next some hole drilling, First thing I did was scribble up a crib sheet, so that I don't get mixed up. Then using an edge fider first centred the mill up on the centre line of the bar, then again with the edge fnder found the end of the bar, and moved the table onto the 4mm hole position, and made this my datum position so everything was zeroed up.

First hole centre then drill undersize to leave a wisker for a 4mm hand reamer.

Now for the steam ports, this is just a mater of chasing arround the datum + and - on the cordinates first with a centre drill then a 2.2mm drill.

Then x and y back on zero and off set to bring you to the bearing coordinate.

Centre drill then roughing then 1/2" drill.

And finaly finish off with a 13mm hand reamer:- I'd tried this drill combination out first on a bit of scrap brass to make shure i got a good fit on the bearing.

Just a trial fit of the few parts to see how it looks.

I've got the rest to do now but that a job for tomorrow

Stew

sbwhart:
Well not much to show for new set ups as I've spent the morning machining the rest of the standards. With the vice stops all that's required is to keep loading the standards to the vice making sure that they are hard up against the stop and down on the parallels.

This is the stop in use.

And this is them all drilled

Not finished yet another four sides to drill but not quite as complicated.

This bits off Topic :offtopic: but I'd show you a pic of the most useful bit of kit I have.

The humble two inch paint brush.

It changes this

Into this in seconds

Keeping the work area clear of swarf is critical, trapped swarf will move the job off datum and throw it out of square, and if its between the vice jaw and the job it will mark the job.

When doing repeat parts an operation that requires multi tools I like to keep the tools easy at hand in a box along with all the other bits required.

The six inch rule is for a quick check that the first hole is going in the right place if that ones right all the rest will be.

And the small lead hammer is it tap the work down onto the parallels the lead gives a dead blow, that stops the work jumping back off the parallels its something to do with the way the lead absorbs the energy of the blow, I think it can be explained by one of Mr Newton's Laws but my physics is not up to a better explanation.

Stew

Bernd:
Yer right Stew. Those two inch brushes help a lot in keeping the area clean.

Reminds me to that I need to replenish my supply. I occasionally loose a bunch of bristtles when the brush gets caught be tween cutter and work. :doh:

Bernd

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