Martin Wynne wrote:
The maximum check span is given as 17.47mm (confusingly called "Between Checks" when it should self-evidently have been called "Across Checks", but it has been that way for 50 years).
This means that the minimum back-to-back is 17.47+0.1 = 17.57mm, or say 17.6mm to be practical with plastic components.
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Hi Martin
You wrote this on 29 April.
In your complicated discussions with Russ later in this thread, which I have not been able to understand, you were talking about maximum and minimum Check Spans. Could you confirm whether your statement above still holds, with its surprising assertion that the P4 BB minimum is 17.57, surprising that is to anyone who thought 17.67 was the BB minimum? Or did the Maximum Check Span become something greater, during those conversations?
Thanks and apologies for going back such a long way in the thread.