Potty Over Crank Wall Engine

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sbwhart:
Thanks for your comments and interest Guys.

--- Quote from: Brass_Machine on January 19, 2011, 03:49:27 PM ---Nice Job Stew!!! :bow:

I am with Chris... why did you plug the cylinders?

Eric

--- End quote ---

Soldering the cylinders together is not that accurate there would be an error in the bore position, by plugged the cylinders and finding the correct location and marking it with centre drill, I was able to clock up on the centre with the wiggler and get the bore accuratly positioned.

This is a little trick you can do with castings.

Stew

Brass_Machine:

--- Quote from: sbwhart on January 19, 2011, 04:14:00 PM ---Soldering the cylinders together is not that accurate there would be an error in the bore position, by plugged the cylinders and finding the correct location and marking it with centre drill, I was able to clock up on the centre with the wiggler and get the bore accuratly positioned.

This is a little trick you can do with castings.

Stew

--- End quote ---

oooohhhh. very smart move :smart: I would have never thought that.

Eric

Stilldrillin:
Sorry Stew. Late again! Only just spotted the posting..... ::)

That's a great start you've made. Really looking forward to watching it develop! :D

Good luck! :thumbup:

(Going to read through again, now).
David D

sbwhart:
:hammer: Got right down to doing number 2 bore this morning just a mater of repositioning the angle plate on the face plate and clocking up on the centre.

And boring it out, I like to sneak up onto the size taking smaller cuts as I get closer and run the final cut through a couple of times to take the spring out of the bar, I don't worry too much about getting exact size as long as its within 0.1mm I'm happy Its far easier to make the pistons to fit.

Her we have them both done

Then over to the mill I left it set up with the stops so it should locate close to where I left it but decided to check bore position before I started the next op using a coaxial indicator.

It was went back within 0.2 so got it back on zero then first centre drill followed M2.5 tapping drill for the cylinder covers, be careful you don't end up with a hole where the air gallery will go, I did this on my first engine a built a few years back, you live and learn.

Tap M2.5 using the tapping stand to get everything nice and square.

Then drill and tap M5 on the underside to take the feet.

As it would make the cylinder a difficult shape to hold I left angling the valve port face till last.
I just angle the cylinder block 15 deg in the vice and milled off the meat.

At this point I was gasping for a cuppa so decided to leave milling the valve ports until tomorrow when I'll be fresh.

Stew

Stilldrillin:
Looking very purposeful Stew! :wave:

Almost a Dreadnaught...... :thumbup:

Well done! :clap:

David D

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