Jam Chuck “Pushaouta” Hole

         A very tense moment can happen when removing an item from a jam chuck without marring or otherwise damaging it in the case of when it “jams” on tighter than expected . A method I’ve used to assist in removing a turning from a sacrificial block that has been held by double stick tape is to pre-drill a “pushaouta” hole before applying the work piece to the mounting block. A pushaouta hole is simply a “knock out hole” pre-drilled in the center for the knock out bar. In addition to the hole, I counter-bored the hole to fit a cork in it to cushion the knock out rod. The same thing can be done for a jam chuck, but in that case you might want to tape a piece of cushioning material to the center of the work piece before mounting it. 

Comments are closed.