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20th July 2016, 04:51 PM #1GOLD MEMBER
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Preventing router tearout - edge blowout
This is a technique that I have used for years, primarily running CNC routers when it is not possible, or in this example, not "easy", to have a backing piece of timber to support the timber fibres. It involves plunging the router directly over the exit point of the router path. Doing this the router takes micro cuts as it plunges and doesn't exert much force on the timber at all. You will see in the video that it can leave a slightly furry edge. This is mostly due to the cutter being used. That cutter has had its life three times over. Partly the furry edge is due to the tiny amount of timber has no rigidity left in it to fight against the cutter, and therefore just folds over backwards without tearing out.
I have used this technique on CNC using 18mm solid timber veneered MDF with a 0.9mm solid timber edge banding. The edge banding is only held on by some crappy hot glue and is easily parted with a sharp chisel if you wanted to. Exiting with a router bit tears the edge banding to shreds.
Take a look. My videography needs improvement. I can't seem to make the video NOT add 20kgs to the operator...must be the phone camera
https://youtu.be/TSKn4cbzVDQ
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