I am still a little worried about the idea that one of our suppliers is supplying collets that Jason doesn't trust to run true and close down in such a way as they distort/crush a piece
I wonder where he got them from... Maybe there is nothing wrong with the collets and someone was just being ham-fisted when they tighten them but it takes a lot of force to crush a tube
The liners were bored in a 5C collet, if you want to use an ER collet you will need an ER40 to hold these liners. They were first bored to 20.50mm and had a final cut of 0.05mm to provide a fine surface before Smelly hones them for me.
As you can see the finished walls are nice and thick but when we fit them we will not be looking to test the strength of these walls
They will be a light press fit all we have to stop is water leaks
The other little job I managed to get done was the Seal's sump screws. In the drawing these are shown as 7A countersunk screws, which are not easy to come by so I am using M2.5 stainless screws who for our purposes are as good as the same pitch as a 7BA. As expected with such a small deep hole not all of the screws lined up or went in square
A bit of hole realigning with a needle file and in the case shown using a milling cutter to move over the hole - they are all in and no-one is none the wiser
Jo