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Wolfgang,

My (still work in progress) code is written entirely in native Postscript (hence my earlier comment about being a pain to debug) and requires no FORTRAN or other high level language to drive it. Effectively all the calculations are done by the printer. I am making it fairly broadly configurable just by editing a few input parameters at the start of the file. Things like Cotangent cylinder circumference and Cosine cylinder circumference, start and end values for the scales, number of turns in the cotan scale, screw pitch, flat or cylindrical are all input parameters. For a cylindrical Bygrave the scales are printed on a slant so as to produce the correct spiral when wrapped around the cylinder (The .pdf of the cotangent scale attached to my earlier post was an example of this).

If you are interested you might send me offline the diameters of your cylinders, the number of turns for the cotan scale and the pitch (or alternatively the length of the cotan cylinder) and I can produce some examples to see what you think.

The one thing on your wish list that is potentially problematic is the general font selection. Not all fonts appear to have the special characters, degree and minute, and mixing fonts may look strange,

Regards,
Robin

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