Jig (Knife plate)
Making jig is almost becoming hobby. It is not wood working.
Good reference book for the jig by ILBA call “Big Boys Jig book” This is series of the jigs developed by member of International Log Builders Association and organized by John Boys. Super helpful book for jig lover. You need to become member to have this, please contact http://www.logassociation.org/index.php
Here what I am sharing today is the knife plate jig modified from log building one. Adapted clamping system also sliding mechanism. Only tools I have seen available to do this job is from Muffel and it cost almost $8,000. My hand made one is about $400 all together.
Parson may able to cut slot by hand very accurate if the cut require only width of chainsaw blade but if it require slightly thicker, it is not possible to do by free hand. Our jig makes our hidden knife plate cut very reliable.