Champy_33, Géobois, Nablateur, Vilko and WhyDi equally share this document.
Planer Jointer Guard Swing7

Preamble : I don't want to write another list of what each woodworker should know in order to work safely. Everybody may find what matters using a search engine with key words "woodworking safety". Albeit all these articles talk to the others and I would have liked to find someone writing : "for my own safety I try to..." which means many more people convey a standard point of view about safety without wondering anything. I avoid these kind of topic that lead to nothing most of time. On the other hand I get involved in every exchange that tend to explain why something would be unsafe et try to find out a better way. It's all about mental attitude and the last one requires the point of view to be argued. Nothing good nothing bad but keeping open minded.WhyDi
Swing7 is a swing away guard aiming planer-jointer cutter head above 150 mm. You may find an easier protector to build for working tool up to 150 mm in that document. Although a bridge guard turns out safer some people would rather use push blocks. This project try to find a satisfactory solution keeping the cutter-head uncovered as less as possible but images number two and four show the protector flaws. As a consequence push blocks are part of this kind of guard and the operator should compel himself to never work without them. The guard arm revolves as soon as the operator feeds the workpiece through the planer-jointer then automatically returns to its start position. The four images below show how Swing7 works and kinematics may be seen in that page.

Feeding


What follows assumes a 310 mm cutter head block, a 430 mm main radius from the cutter head axis to the pivot and a minimum sliding cover width of 100 mm. The bending track allows each trapeze of the sliding cover to fold at a maximum 30° angle. Swing7 is designed to never go out 170 mm from the cutter head block which means 100 mm out of the machine. Nonetheless you may calculate your own dimensions there.

Room


As the rotating arm clears the cutter head the sliding cover moves along the bending track that may also be used as a chuck housing. In that case Swing7 covers the full length of the planer-jointer cutter head when mortising.

Mortising