Proxxon MF70 CNC conversion 2019

thingiverse

WORK IN PROGRESS Upgrading a classic project, the Proxxon MF70 from manual to CNC. This is my second upgrade of the MF70, starting with one of the bolt-on conversion kits which does the job but still relies on soft end plates and leaves the stepper motor hanging somewhat loose. I was about to print the bubblegum conversion kit when I decided to draw my own based on that conversion, making this a learning process for me as I get familiar with CAD (Fusion 360) and 3D printing, followed by basic CNC milling. Using axial bearings F6-14M (6x14x5mm), I have dropped the manual scale on the handles and gone all in (CNC) on this conversion. I still have the handles at the end of the steppers, so a bit of manual milling is still doable. The switches for the endstops have been incorporated into the housings, and I'm trying to extend the Y-axis from ~46mm to ~70 mm, making the mill live up to its name. Be aware that there seem to be two different versions of the cross-table with a 1mm difference in the position of the threaded rods; do your own checks. This is WORK IN PROGRESS - changes will probably follow as I realize what needs to be fixed and improved. Y-axis mounts have been reworked, moving the bearing otherwise the spindle would be too short.