@ MPH, Russ, Ken, Ray, John
Thanks for the appreciative statements
The modeling and the drawing, both are two areas of my hobby. In the CAD I can determine exactly all sizes.
I still remember a few years ago when I came into contact with the CAD, there was very often the "how can I do it?" in my head. Today, I can check with the CAD already the idea even before production! It does not have to start with a huge project. Step by step you can continue.
A friend helps me very well, so I'm now able to realize my next step.
The roof was the next challenge for me.
First, the curvature of the roof was drawn from the side and extruded into the depth.Münzel-Kran_045
It was followed by a new layer from the top, which received the contours of the openings and the rear roof rounding. The next step was a negative extrusion into the depths of everything - like a punch.Münzel-Kran_046
It was followed by a winding-up of the rounded roof, in order to generate a DXF file. For each milling the corresponding lines have been inked.Münzel-Kran_047
The visible black lines mark the lower contour of the once vaulted roof. They should not be milled. Münzel-Kran_048
is a very helpful software to generate the neccessary tap-file format .Münzel-Kran_049
Each color is assigned to a cutter. There are depth of cut, number of runs with different depths, speed, feed, ... predetermined.Münzel-Kran_050
I milled with a maximum of the half of the cutter diameter in the deep.
After cutting out the 2mm brass plate the next step was the bending of the roof.
Experience I had already done with a 1mm sheet earlier. Shown here
So now, the sheet was annealed with a gas burner and then bent in several passes, each time the radius of the bending machine
was set narrower.
Some care is important so that the sheet is also parallel, it must be given absolutely perpendicular to the machine!
If you bent one too much ... no problem: Simply roll the plate with a large radius setting of the machine from the back flat again. Then go to work with the right attitude once more! The metal is soft enough from annealing.
The manufacturer of the bending machine stated as the greatest thickness at 1mm brass. I used on both sides "victim plates" and so I got to a total thickness of 3mm - the machine has survived without any effort!
But see for yourself - all parts are put together only loosely:Münzel-Kran_041