Don't know what happened to the pics but I have machined both the displacer cylinder and the hot end. The hot end was silver soldered together and on the end I added a piece of what proved to be hard as
Stainless. I tried supporting the cylinder with a fixed steady but because the tube section is rather thin it kept moving/crushing the stainless
In the end I achieved this:
Yes the top of the hot end cylinder just fits between the back of the chuck and the LO taper
It was a
to turn, next time I need to make sure the end cap is easy to turn 303
not that hard stuff. Maybe that is why it is still on the shelf
The next trick was to get the hot end to fit into the hole through all the castings. I decided the best way to see if I had cleaned it up enough was to poke it in in reverse:
As you can see the natural curve on the silver solder is preventing the hot cap from sitting tight against the casting. Once that was removed it was then time to slide it all together:
To find
:
There is a gap . Further investigations on the cross sectional drawing shows a gasket and it should be 1.5mm thick. So I am calling that success
The displacer cylinder is a piece of tube with two end caps made super thin:
These need to be loctited in once the length of the displacer is known from the build. Which leaves that nasty looking displacer rod. If you read the instructions it says the bottom half is mild steel and the top half is brass
I am not convinced a 5BA thread in a 4.76mm diameter rod looks particularly strong
Having checked the piece of brass I intend on using is straight by rolling it on a surface plate:
And added a 5BA thread to a piece of 3.2mm diameter stainless for the bottom half of the rod. I can begin to contemplate if I am happy or not with so little brass left holding things together
Jo