week 11 die switching mechanism

This week me in and I couldn't manage a time to meet, so I stayed home and did some design on the quick die-switching mechanism since the bender is being built at his house. I did some research about expandable die, similar to a transforming table where it transforms from a small circle to a larger circle. This mechanism require extreme precision and internal design. So what I think is most suitable is to make multiple dies with different desired redii and develop a quick switching mechanism to quickly switch out different dies so the future bending and testing can be done easily. Below is some sketches of the design.