Hi Lee,

thanks again for the reply. Here's an updated version of the drawing, showing the internals and the T section you mentioned:



As you can see, I've put slots in the sides to match the T section and make it more stable. I've added two 47mm holes to press the tapered roller bearings into, but because the bearings are normally around 15mm thick, I had to leave them sticking out a bit, as the hole is only 10mm deep. This leaves only 5mm of material under the bearing, so I'm thinking of adding another 15mm plate under the bearing, so support it better. There's also a hole for the drive screw (which will be a simple m10 threaded rod for now) which will sit in Oilite bushes, as it won't move a lot.

To answer your question, the spindle sticks out as I will try to drive the thing manually, so I need a way of adding a handle of some sort to the top. In the final version there will be a pulley mounted on the spindle, hidden inside the top section, with a toothed wheel driven by a motor, mounted in the 'pillar' section of the chassis.

Regards,
dsc.