Home Grown Precision Grinding Vises

[OldCarGuy]

The tenon slots in the base are really handy for setting up on a rotary table, enabling the vise to be slid along at the same setting to another offset while keeping parallel.
Mine are also ancient but still going strong, the smaller ones use a fine l/h thread.
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Nice work there! Clever idea for sure of sine bar capability in a second direction on the top vise....