Having had to wait for a few more materials things stalled for a while but I've now managed to make significant progress
First to tackle was the small crank web, it's a simple component but I did want to try and achieve an attractive profile if possible
I thought mounting it on a purpose made fixture on the rotary table seemed the easiest way
Tap the fixture at 6mm.
With the part bolted down it's on to milling the raised boss
Then the tapering sides.
After a bit of filing the profile by hand it is fixed to the crank shaft using Loctite 638 and given a quick skim in the lathe.
I chose to turn the 4 columns next, these are made from
7/
16 steel rod but need a slight taper cutting. I chose to adopt Jasons rather neat method of using a milling boring head as a means of offsetting a centre in the tailstock. I don't have a small revolving centre to fit the milling head but thought I'd make a crude dead centre and see how it goes.
With temporary centre hardened it's on to the columns by turning and threading one end and drilling the centre hole.
Turn down the other end to accept a thread later and hopefully allow a little flexing to turn the taper using the offset.
So far so good, seem to be getting a taper
All that's needed now is to turn 3 more then move on to the entablature plate. This is made from 5mm thick steel with a large square central hole and various fixing holes. I chose to cut the centre hole first as I thought this would make it easier to hold for later operations.
6mm holes give radiussed corners.
Then mill out the centre.
Cutting radiussed corners at the front next
That takes me to this point
I did a it more work tidying up the bearing blocks and now reasonably happy with the result.
All in all it's now taking shape, I'd like to try and get the capitals for the columns and the base plate cut over the weekend
Peter.