https://3dwarehouse.sketchup.com/model.html?id=u741cce04-f44d-4dd2-93b7-8a16d74b671aHi guys!
I'm designing the micro-manipulator for 3D printing. I got the inspiration from the 3D printable micro-manipulator Mr. Pearce suggested, and I'm trying to make it as compact as possible while, in the same time, using easy to find parts like standard M3 screws (60mm, 40mm, etc) for the linear movement.
We (Tibi and I) are wondering if it's better to go with precision screws instead of M3, could you guys give your opinion on this?
The idea being that M3 screw has a pitch of 0.5mm so the linear movement with a full turn will be 0.5mm, half turn will be 0.25mm, quarter turn will be 0.125mm. Will that be precise enough for this application?
The other idea is that M3 screws have imperfections (unlike precision screws), so the linear movement will not be so linear.
Backlash: if you look at the model, I'm using 2 sockets in the middle of the screw, separated by a soft and thin washer to prevent the backlash. Precision screws have very little backlash.
M3 screws are available in every lab or hardware store, precision screws need to be ordered but they are not expensive (~7$ / screw+socket)
THEN, we are thinking of using set screws to compensate for 3D printing imperfection from using different printers. This will add some complexity so I will print one prototype to see if set screws are needed or not, if there is ware in the plastic from turning the screw, etc. Still need your opinion on using set screws or not.
Please participate in the design if you can, it would be nice to have as many brains as possible on this
Thanks!