32x40 H Gas Engine

[Brian]

Back to work again on the little engine.
I have separated the piston blank and mounted it on a Morse collet ready for machining,
the liner has been roughed out and is waiting for the cylinder barrel.
   

starting work on the blank for the barrel what appeared to be mill scale turned out to be a stop in the casting causing a flaw through the bar, a call to the supplier got a new bar in the post pronto and a big apology.
   

Looking around for something to do I did the valve timing diagram Just another thing out of the way.
   
I have changed my mind about the crank case an have decided to make it from 10mm alloy plate.
So i am now twiddling my thumbs waiting on the postman again

Brian.

[Brian]

The replacement iron has arrived and chips are flying, milling out the blank for the barrel. not long now and we will be into serious machining.up to now the tolerance has been ,25mm that is about to change.
Brian

[DaveH]

I'm ready

DaveH

[EdK]

Ed

[Brian]

O K so now we have the blank size within .002" of spec , the lump at the top will be the rocker arm support.
Hang on you have not got the updated drawing. this is changing as we go along.
   

I think that's it hard to read these thumbnails.
now the pic
   

This was then marked for the center of the bore to take the liner.
   

Then carefully set up in the mill and a pilot hole drilled.

   

Finally opened up to 12mm,

   

That's all for now

Brian

[Brian]

Latest picture. And I am sorry to tell you that the hole is not right, It is supposed to be 38mm and its only 37.99.

   

Next job is to machine the location for the liner flange.

Brian.

[DaveH]

(05-05-2014, 12:34 PM)Brian Wrote: Latest picture. And I am sorry to tell you that the hole is not right, It is supposed to be 38mm and its only 37.99.
Brian.

Oh dear
I bet I could get it to read 38.00
Looking good so far Brian

DaveH

[Brian]

Recess for the liner put in.

   

Water jacket space bored out, and a little more work on the rocker support.

   

Brian

[Brian]

Today I turned the OD of the liner to fit the barrel, the first two parts that fit together,
   

   

   

Slowly slowly,
Brian

[DaveH]

Nicely done

DaveH