Retractable internal screw cutting tool

[thehomeengineer]

Hi All
The drawings have been modified and updated for a third time today, as I keep coming up with improvements (that’s before I have even started to cut any metal) I am sure this will be an ongoing theme. This afternoon I started sawing the material (As I think I am happy with the design?), so after a couple of weeks designing and many years thinking about it, it is now on its way.

It is amazing that you think you have covered every based then BANG a better idea comes in to your head, so you go back to the drawing board (well the computer).

Thank you to all, for the positive response and once finished I am sure there will be further ideas and improvements by you and myself. Is there such a thing as the perfect tool?

The Home Engineer