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In my Proma HP-250/3-400 jointer-thicknesser, the following black sheet of metal is mounted parallel to the blade cylinder.

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Do you have any idea what purpose does it serve?

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It doesn't seem to be listed in the schematic (which doesn't have part descriptions anyway).

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    Is it in the path of ejected chips?
    – Graphus
    Commented Sep 5, 2023 at 7:28
  • @Graphus Indeed, when the machine is in jointer mode, the sheet of metal seems to prevent the chips from flying away from the dust collector nozzle. This could be it! Thank you! Commented Sep 5, 2023 at 14:23

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Based on location and how it's angled, this appears to be a deflector for chips. Why it's not a numbered part in the parts diagram is a mystery!

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