On 08/12/2024 03:21, Curious Marc wrote:
Looks like a perfect copy of an IBM 001. They probably copied the defects too…
I’d look up IBM 001 manual.
Marc
I think so, IBM itself didn't sell punched card equipment in the UK or
the British Empire until 1948. (Except Canada)
Prior to that the British Tabulating Machine Company had the exclusive
rights to make and sell its card processing machines.
https://en.wikipedia.org/wiki/British_Tabulating_Machine_Company
So pre 1948 all of their machines were basically copies of IBM machines.
They joined with "Powers-Samas" in 1959 to become "International
Calculators and Tabulators" and by this time they were designing their
own machines.
I expect that as any patents on the Model 001 would have expired they
just kept on making them, but with an ICT plate, and later an ICL plate
Dave
On Dec 4, 2024, at 1:01 PM, David Wade via cctalk <[email protected]> wrote:
On 04/12/2024 18:49, Tony Duell wrote:
On Wed, Dec 4, 2024 at 6:41 PM David Wade via cctalk
<[email protected]> wrote:
Folks,
I have been trying to restore a manual card punch. The type with 12
"Buttons" or "Plungers" that operate a lever which pushes a punch "pin"
through a die to create a hole in a card.
Its almost identical to this one:-
https://www.computinghistory.org.uk/det/38019/ICL-Hand-Key-Punch-Card-Machine/
I know it. Mine has an ICT (International Computers and Tabulators)
badge on the front
Mine says "Made In India" as well...
so despite lots of cleaning some of the pins stick down. Does any one
have any suggestions how to clean the small square slots?
From memory there's the stem of the key in circular holes. There's a
flat on the stem to engage the punch lever which is pivoted at the
left hand side. And the punch pin in the die block.
Do you know what is sticking?
The punch pin in the die block. After lots of cleaning the slots with a very
small file and lubricating with a modern lubricant with PTFE it now seems to
punch but the mechanism that controls the card advance seems to stick..
There's a unit with 12 slots with ball bearings between some of them
to the left of the buttons.. It prevents you pressing more than 1
digit key down at once. That cam cause the levers to stick.
It doesn't have this....
... and I need to clean the rest...
-tony
Dave
