The present subject matter relates to a log dog, a kit thereof, a set bar assembly, and a log bed with the log dog and set bar assembly. The log dog includes a rod with a groove, and a head block with a cylindrical cavity for receiving the groove and with a bore extending through the sidewall. A pin extends through the bore to the cylindrical cavity for rotatable engagement with the groove to releasably hold the head block to the rod. The set bar assembly includes a pair of mounting brackets with a holder having lower and upper sections. A support bar is secured between the mounting brackets and a pivot arm extends from the support bar. The set bar assembly includes a stop bar received in the holder, wherein moving the stop bar between the lower and upper sections of the holder lowers and raises the pivot arm.

A novel sawmill carriage knee and dog positioning system using a chain knee drive that allows vertical access to chain tension adjustment screws, provides a chain mounting attachment plate connected to an adequately sized air cylinder attached to a dogs in/out carrier slide increasing structural rigidity and reducing component count, weight and unit cost, and providing a novel method to taper the knees relative to the sawline.

A novel sawmill carriage knee and dog positioning system using a chain knee drive that allows vertical access to chain tension adjustment screws, provides a chain mounting attachment plate connected to an adequately sized air cylinder attached to a dogs in/out carrier slide increasing structural rigidity and reducing component count, weight and unit cost, and providing a novel method to taper the knees relative to the sawline.