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The tables supplied with the Vertex HV6 are notorious for containing some frustrating errors.

Howard Lewis has prepared a detailed table giving the correct figures,a nd has given me permission to make it available here:

Vertex HV6 Dividing Head corrected table.

The table can be used with any 90:1 ratio dividing head assuming discs with the corrrect numbers of holes are available.

Thanks Howard!

A gratuitous picture showing some gear wheels probably not produced with the aid of an HV6.

A very fine display of dividing accessories and a technique for making sprials by Peter Pardington of the Ickenham society