The Curta.org Bulletin Board

[kagamma]

Hi! I've owned a curta type II for quite a while, but only recently after printing and assembling Wu's 3D-printed version of the curta, did I have enough courage to disassemble mine for some cleaning and lubrication.

Disassembling the main body went quite smoothly; I managed to take everything out for ultrasonic cleaning and lubrication, and reassembling them back, following the service manual: https://www.vcalc.net/cu-lube.htm . However, when it came to the carriage, everything went well until I needed to remove the two carriage pins: https://imgur.com/a/4LiBK3s

Unlike the type I/3D printed version, these 2 are horizontal. The one in the picture is very tight, and any attempts to push it out have failed so far. I could try to brute-force it, but I am afraid I might end up damaging the surrounding area. My punch tools are also quite long, which makes it hard to hammer it out. I wonder how everyone else manages to remove them and which tools I should use in this case. I am quite new to this so any advice would be appreciated.

Also according to https://curta.li/05_anleitungen/200_service_handbuch/221_demontage_q0.html (I can't read German, so I am only looking at the pictures for reference), I am supposed to remove the two pins at once (step 11), but I can't locate the second one anywhere inside the housing.

[murff]

You need something like this - a base that keeps the carriage stable when releasing the pins:



Assembly aid for carriage ring (conical pin)

https://curta.li/05_anleitungen/500_tools/59_109109_03.html


On the other hand, the carriage can also be easily cleaned as a whole unit (without the balls and the star - as in the picture).
_________________
:: m u r f f
:: curta.li

[kagamma]

[murff]

something like that:



I don't have a 0.9 mm punch.


And it works really well - first clean the carriage with thinner and then oil the shafts close to the number wheels (not too much).
_________________
:: m u r f f
:: curta.li

[kagamma]

Thanks. I will go with cleaning the whole unit for now because all my punch tools are long slender type for watches and do not have enough tolerance for the push.