I'm finding a large jaw capacity post vise comes in pretty handy for wood cutting, when my old bench vise broke I kept the main screw and nut and used them to make a leg vise for my outdoor work bench, it's been so useful over the years I decided to make another one for wood cutting. This time I'm using a threaded screw from a scissor jack with a ¾" hex head. Any wreckers should have plenty of scissor jacks. It just so happens a piece of 1¾" telespar is the perfect size for holding the nut in place providing an easy way of bolting it on, with a little persuasion the piece was opened up allowing the nut to be slipped inside, a vise can then be used to bend the telespar back to it's original shape. The main 2½" O.D post will be mounted on this 6" x 6" x ¼" steel plate which has a length of 2" O.D pipe welded on, 6" lag bolts are used to secure it to a double layer of 2" x 6" boards with a piece of 1" plywood on top. 3 side braces lag bolted into the base hold the pipe solid, the stationary and clamping 2" x 6" boards are 36" long. Nut secured to back of 2" x 6" using carriage bolts. With a large 12" jaw opening the vise can hold everything from large blocks to shipping pallets. Installing a "V" shaped saw horse attachment allows for more versatility for cutting longer pieces with a chain saw. Narrow width leaves a 16" pile of wood after all the cutting is done. Placing the wheel barrow under each cut makes for less bending picking up wood. A few links of chain held by the screw makes a solid point to hook the ratchet strap.
Seemed like an awful lot of work to build a jig/holder to cut wood until I finally scrolled to the bottom and saw what you were cutting . That is certainly robust and not under engineered.
I like it. Always a problem to hold those odd shapes or multiple smaller stuff. Truly a triumph of "Red Neck Engineering"!
