TOBIN ARP Model P.M. 2000 Connecting Rod Boring Machine #7955

TOBIN ARP Model P.M. 2000 Connecting Rod Boring Machine #7955

SPECIFICATIONS:
Rod boring capability: The P.M. 2000 is designed to bore both the big ends (crankshaft bore) and small ends (piston pin bore) of connecting rods.

Boring bar system: The machine uses boring bars of varying sizes, with common diameters including 1 inch and 5/8 inch, as seen in available spare parts.

Precision and setup: While specific tolerances are not documented, the machine was marketed for precision work. YouTube videos showing operation demonstrate how rods are clamped and adjusted on the table before the boring process. This involves locking the rod and aligning it with the machine's boring bar.

Tooling compatibility: Since Tobin-Arp became part of Sunnen, tooling for later Sunnen machines may be compatible with the P.M. 2000. For instance, replacement mandrels and boring bars are sometimes advertised for both brands.