Curta Calculator Assembly Part2

I continue assembling the 3D printed Curta calculator.

[@Lagittaja]

Yeah, dry PTFE is such an excellent lubricant, especially for plastic parts. I think the most successful application for me has been the pull-out trays in my bedroom wardrobe. They're made from some type of plastic and they have plastic rails/channels on the sides and the tray slides in those. Good lord how much stiction they had when I moved here. They weren't visibly dirty nor did I see any detritus on paper when I wiped them. Just too much friction. Few squirts of dry PTFE and they slide like a dream. 4½ years later I can still move them with my pinky with clothes on top of the trays. Which I think is fairly impressive considering the contact area is like almost 50cm times few millimeters times two..

[@animoose]

The original design has spring clips where you use O-rings to hold the fixed gears. Marcus's OnShape file includes them but he did not make STLs from them, as they are too flimsy. However, if you modify them to make them thicker, they do work fine.

[@JerryWalker001]

Yes I know but I decided that O rings would work better here as they are only temporary. In my final version I will just use the plain type drive shaft and circliips. This will allow adjustment of the gear position and they will not need grooves on a plastic rod. I may also add bearing caps at each end of the drive shafts as the cutout in each shaft extends to the end of each shaft and so runs in the bearing holes which causes a lot of friction.

[@heidi5942]

Is general WD-40 good enough? I looked at my cans and they don't give any ingredients list.

[@lostmemories6450]

regular WD-40 is not a lubricant. It is used to clear moisture off of things and thus breaking down grime in the process, which makes it feel like it lubricates.