Jukka
The Bridgeport Mill Group on Yahoo **LINK** has near complete circuit diagram and supporting data for a generic Erskine power feed board in the files. About the only thing missing is pulse transformer data. Differences between the various versions and issues of this circuit are minor, mostly component type numbers and similar where there are a number of functional equivalents to choose from.
If you don't want to sign up to the group PM me and I'll push a set of my original PDF files over. Best to sign up tho' as I make an effort to keep the group files up to date when errors or further information comes to light but I can't guarantee this for folk who have taken them direct.
There are a couple of whole machine wiring diagrams for UK built versions on there too.
Clive.