A detailed Instruction and Parts Manual is available for Micropoint tool grinder
Intended to be used in conjunction with the company's range of superb Spiramatic Jig Borers - and in particular to regrind, to a very high degree of accuracy, the special cutters they used, the single-point "Microbore" boring, facing and turning type - the "Micropoint" tool grinder was a beautifully-built machine. Very heavily constructed and with hardened and ground cylindrical ways, once and operator was familiar with the direct-reading controls - and by employing various accessories - he or she could grind Microbore cartridges from size 1 through 10 and ordinary square tool cutters with sections from 1/4" to 1" and round from 1/8" to 1/2". The cutting edge of the tool could be finished with great accuracy for radius, angle, offset and clearance and the machine could handle jobs in high-speed steel carbide and ceramic.
Using the centre of the radius of the cutting tool's tip as the stating point, the Micropoint was designed to grind all other dimensions relative to this and so accurately blend in the flats of the leading and end faces. The makers illustrated the results of correct tool grinding by using the example of Spiramatic jig borer taking a 0.010" deep cut while advancing at the rate of 0.002" per revolution of the workpiece (in other works, like all turning and boring jobs, generating what is , in effect, a thread). Under high magnification, the resulting surface finish generated showed a trough-to-peak difference of just 0.00005" - additional details of how this was achieved and how the machine functioned are explained in the catalog pages below.
The history of the DeVlieg Company of Royal Oak, Michigan is most interesting, and an account of the wonderful machines they made - many of which are still in profitable use - can be found here.