The majority of milling machines available to small workshop owners have a top spindle speed of less than 3,000 rpm. For most general milling purposes this is fine but, if you use cutters with a diameter less than Ø2mm, this top speed is simply not adequate.
These smaller cutters are stock-in-trade for the clock maker and repairer for profiling, crossing out wheels and engraving, especially in brass. At best, running these small cutters at low speeds will mean painfully slow feed rates. At worst, an otherwise perfect job is spoiled by irregular cutter performance.
The Speed Increaser, designed by Dick Stephen, is a simple, oil filled epicyclic gear box, offering a x3 speed increase. It can be quickly fitted to any machine tool spindle to give an output speed of up to 9,000 rpm.
Please note that the design provides an output rotation OPPOSITE to input rotation. Consequently, you will need to be able to reverse your machine's spindle to use conventional cutters.
Along with 3D CAD drawings and instructions, the kit comes complete with all necessary material including steel, bronze, gears, miniature bearings and fasteners.
