Volvo G990 Grader

[Stefan]

Steve, in the figure I´ve tried to illustrate a piece of material which has sprung back after having been tightly bent around the mandrel. The next time you bend something you should note down the spring back ratio k=R/r of the material. This, in my experience, is a material constant. So thereafter you can easily calculate which D you need for the R you really want as:

D=2R/k-t

where, obviously, t is the material thickness.



Stefan

[Stefan]

I´ve some pics from modelling the lower edge of the moldboard blade. First, a 2 mm strip had a radius formed to it and was soldered to the back of the blade.





The heat caused some unwanted bending


Milling the forward side to replicate the recess. The strip enabled a good grip in the vice.




This is the first pass with the radius mill which took care of the concave radius of the S-shaped bend. There were a further two passes made to approximate the convex radius. I still have to remove (probably by grinding) the remaining material on the convex radius.


Thanks for looking.
Stefan