The Curta.org Bulletin Board

[davhamm]

Guess I am taking a top down approach. I know little here, there are several types of metal and several types of plastic? or only 1 plastic? different or same type 1 to type 2? Are all within a type interchangable? Then there is that metal knurlled handle on the end or is that a different item?

[murff]

As I know...

There are different types of the complete crank:
with metal crank arm
- at least two different lengths
- without or with a white arrow
- hole for the conus pin on the left or in front of the crank arm (0 or 90 degree)
- with blank metal or red painting (for subtraction position)

with plastic crank arm
--- the plastic is called Delrin
--- only one type of plastic crank arm (?)

The position of the hole for mounting on the main shaft differs between the plastic and metal type - so it's not interchangeable. Also the knurled handle is not compatible because the axle is not exactly the same.
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[Gary Nivaggi]

This has long stumped me...

Initially the metal cranks on those earliest units, both type I and type II, had NO arrow markings...soon however, the arrows were present on these metal cranks.

The plastic cranks, on both I and II have had arrow markings from the beginning and in all these examples, the angular orientation of the arrow appears consistent.

I've even placed a temporary arrow on my early type I to try and determine what purpose the arrow would serve during operation, but sadly have no clue yet.

Help...am I missing something??