On 2019-01-19 04:57, Mattis Lind via cctalk wrote: > So I concluded that the best option is to make a new pen holder plunger > which could take standard ball point refill. The Pilot BRFV-10M seemed to > be very common refill and would probably work well if I had another pen > holder. I asked around and found a guy with a lathe that made one for me. > Unfortunately it wasn't working immediately. I hadn't thought of certain > mechanical properties of the mechanism.
I did something like that 20 years ago for my HP plotters. Back then, I found some ball points, which had a pressurized cartridge, so you could draw pretty quick lines ;-) Yes, I did it with an aluminum holder, today, I would probably ask somebody to 3d print some plastic piece, to reduce the weight of the moving part > Then I had a problem that the pen stayed in the up position. Most likely > held by some kind of remaining magnetism that could withstand the force of > the spring. A couple of M3 washers was used to reduce the contact area > between the pen holder plunger and the top lid which made it work. > > http://i.imgur.com/PRGUa9U.jpg You're not planing on getting this through TSA? ;-) > And in action: > > https://i.makeagif.com/save/QCDG_W Pretty COOL !!! > controlled by a quick and dirty PDP-11 program : > https://github.com/MattisLind/pdp11-plot One day I have to set up gcc for my pdp11 ... Cheers!