PCB Drill

This is the result of me not beeing able to buy a good PCB drill. I am VERY satisfied with the result. For the up/down movement of the "sledge" linear bearings is used (LM8UU, 8x15x17). The only thing I regret is that I shold have used roller bearings in the rotating part. But that's an easy fix because the part that will need to be changed is 3D-printed. I produced this by means of a 3D-printer, a CNC milling machine (which I also have as a model on this site) and a turning device. It's essential that both the rack and the pinion is printed laying on the side so the teeth will be nice. This two parts I printed with 0,1mm layer height for accuracy. I tried several designs for the stand/foot in 3D printing but none of them were stable so I decided to mill it in aluminium. If one were to accept that the drill couldn't take so big PCB's (35cm on the short side) it might be possible to make it stable enough with a 3D printed stand/foot because of less overhang, I think.. The geometri of the rack and pinion is good enough to adjust them so they touch. There will be no stuttering in the up/down movement. This is the reason I choose to use an adjustable counterweight instead of a spring. I designed it so a spring could be easily retro fitted if the rack and pinion needed slop, but it didn't. I also implemented two stop-thingies so you can decide yourself at which height the slider will return to when the handle is released. The design has been layout for the "Proxxon Micromot 40E+" mini drill that I happened to have laying around. I think it's obsolete so another holder has to be designed if someone wants to use this design. The whole thing is designed with Inventor 2021 (the files can easily be imported with Fusion 360).