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Model M Head
This was the head fitted to the first Bridgeport milling machines and had 3.5-inches of quill travel through both fine and quick-action feeds by hand operation only.
The spindle could be ordered with a No. 2 Morse, B & S No. 7 or a B-3 taper - and the maximum collet capacity was 0.5 inches. Special tapers were available to order and it is highly likely that a factory already equipped with tooling to a different specification might have ordered its machines so as to be able to mount cutters already in stock.
The 0.5 h.p. motor was available as either a 1200 rpm unit - which gave spindle speeds of 275, 425, 700, 1050, 2100 and 4250 rpm - or as a 3600 rpm model with rather higher spindle speeds of 950, 1350, 2200, 3250, 6500 and 12000 rpm.
The unit could be mounted either on the front or back of the ram and, if on the latter, fitted to a swivel adapter that allowed it to be angled in both planes.

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