This is the coolest project ever. Thank you for sharing. I've been a Curta enthusiast since the late 90's.
@neurojitsu
Ай бұрын
Great video series, thanks for sharing generously and taking the time to make these videos. I'm fascinated by such devices. I'm new to 3D printing having just got my first 3d printer, but keen to get stuck in with some learning projects. My goal is to design and print my own functional designs, and so this sort of study of mechanical devices is perfect learning material for me - and I'd love to have a working example of a curta model on my desk as reward.
@animoose
Ай бұрын
The info on getting the carry lever right is very helpful. I haven't been happy with the ones I made. I also tried a version someone published with a built in printed spring, and I think it is too lax. One more check you might want to look at before going further is not just that the selectors move the gear, but also that it lines up exactly with the narrow teeth on the step drum. This is easiest seen when in the 9 position. Mine was OK but not perfect, and I adjusted it by changing the dimensions of the bearing and the top.
@JerryWalker001
Ай бұрын
You are trying to get ahead of my project :) I will demonstrate how I test the alignment in a later video as this is best done when the carriage is fitted. This is because the gears at the top of the drive shafts generate side 'thrust'. However the initial testing I have done is to check that positions 4 and 6 line up in the centre of each gear. I am skipping over a lot of this at the moment because many people seem to have very short attention spans these days and do not like detailed explanations so I try to strike a balance. As with most things I do I have carried out MANY tests and checks as I have proceeded and in a later video I will go into the fact that the current step drum is the third I printed as I modified it slightly to make alignment more reliable.
@animoose
Ай бұрын
@@JerryWalker001 Thanks, I look forward to seeing the later videos. I guess I am an outlier, as I like the detailed info. I've learned a lot from it for my own build (progressing very slowly).
@JerryWalker001
Ай бұрын
Just in case you are still having issues I have found that there are errors in the stl files or manual or both. The last 3 result subtraction gears are in the wrong place on the shaft and so try to turn outside of the unlock part of the bell. They are cause improper addition results. The gear teeth on those 3 gears should align with the top 9 tooth row on the step drum and not the 9 teeth on the reversing part of the drum. Also the counter gear on the first digit shaft is in the wrong place and is not aligning with the required drum teeth in either addition or sub mode. I will show this in the next video.
@animoose
Ай бұрын
@@JerryWalker001 Thanks, looking forward to the next video. I'm still working through the turns counter and the earlier transmission shafts. The process of cleaning up the parts is very slow for me, and I'm not happy with the initial prints of the gears. They work but don't work well. Better choice of layer size and support parameters seems to help.
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