Why Your Planer Sled Might Not Be Safe

[@JC-km2io]

Your visual aid demo of a short board going through the planer was one of the most helpful tips on planer safety I’ve ever seen on KZbin. Thanks for potentially saving my projects, equipment, or life.

[@Matt.Hagens]

Great video, thank you.

[@mundlkalli4396]

Excellent video ,demo and explanation. I am totally new at this. Somewhat intimidated (well actually more then somewhat ) but your video has giving me more confidence.Knowing how the rollers and cutter works during the planing. Thank you again !!!!

[@playpadel5926]

Excellent video, thank you.

[@geeksam]

This is great, thank you! I'm less than a year into this new hobby, and I always find it helpful to have a mental model of what's happening that lets me predict what's safe and what isn't. Your cardboard prop is perfect. :) Quick(ish) note about friction: one thing I remember from my physics classes is that friction is almost always *lower* between two objects that are moving relative to each other. (Look up "coefficient of friction" and keep an eye out for the terms "static" and "dynamic".) I don't think the calculations matter for the purposes of your explanation, but the difference means that the roller starts out pushing forward using the coefficient of *static* frction... but as soon as the cutting head starts to push the board backwards even a tiny bit harder than the roller can push it forward, the roller starts to slide relative to the wood, which means it starts to use the lower coefficient of *kinetic* friction. Just like that, suddenly the cutting head is pushing backwards a LOT harder than the roller, and out comes the board. This is the same reason a lot of cars have ABS: a skidding tire loses its grip, so the computer steps in and cuts the brakes to that tire to let it "catch up" to the road again, faster than a human can react, to stop the car faster than it would if it just laid down a long patch of rubber.

[@robertsmith3518]

Why do use boards with no twist and 95% flat on your vid’s . Could you use a board with a twist and Cupped to demonstrate? Thanks

[@rossmcleod7983]

This vid should be mandatory viewing for all us poor noobs with their first thicknesses purchase. Many thanks.

[@PatBuckleyracecar]

Keep the planer bed waxed