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Potty Over Crank Wall Engine

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sbwhart:
Hi Nick

I measured, then tried them for fit just a little bit of clearance.

Stew

sbwhart:
I bet you're wondering where I've bin with this, well had a few days out over the weekend spent in windy Cornwall.

Got a bit done over the last couple of days made the nuts for the glands.

Not much to these except try and make them in one go to get the thread concentric with the bore and to ream the bore.



Also lapped the port face nice a flat using a bit of fine wet and dry on a flat surface, this is so the slide valve makes a nice seating onto it.



I cut all the studs to length I'm just waiting for some stud lock to be delivered to fix them in place.

Made the slide valve, I made both valves in one piece saves setting up. Start by milling a bit of bar to size then as a guide mark out the recess.



Then over onto the mill I like to work from the centre out but any way you're happy with will do its really quite easy if you've got a DRO I made slide valves without the DRO and you really have to be carful how you manage the back lash or you can get it all wrong. The first cut only has to be correct as you deepen the pocket you can finish the cut short it won't matter a jot it's only the edge that does the work. Just work clock wise around the pocket so you're not climb milling.

First done



Second done



Flip it over and do the back

Slot for rod



Check that depth is good



Slot for cross bar.



Then cut it in half to make the two, and mill to length and don't forget to lap the face nice and flat same as for the cylinder.



Next I tried out my new mini vice to make the cross bar this is made from a bit of 1/4" square mild steel again make the two together.

Put the bit of bar on a flat plate put the vice over the top of it tighten vice that the bar gripped nice and level,



Then transfer the little vice to the big vice drill and tap.



And thats the slide valve done and fitted.



Stew

Stilldrillin:
Stew.
That last pic sums it up nicely!  :clap:

Coming together, and looking well.....  :thumbup:

David D

GWRdriver:
Stew,
I haven't checked on you in a while . . . I like your work.

Bogstandard:
This project is coming along very nice Stew.

Those tiny vices are a nice bit of kit when it comes to swinging around those 'unholdable' bits that need machining. I basically got laughed at when I first showed mine being used, but I had the last laugh when I showed it being used with a cutter almost as big as the vice cutting away at a miniscule sized part.

John

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