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Old 05-02-2014, 06:19 PM
Xray Xray is offline
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Join Date: Feb 2011
Posts: 1,630
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Might want to try screwing directly into spoilboard and see if situation changes. 2 screws kitty corner should do.
Even when screwed thin plexi can easily lift, especially with an upcut bit. This lifting/flexing will always cause chatter/nicks/rough edges.
Feed seems about right, though I sometimes slow to 50 with the thin stuff ... Also reduce RPM's if possible, just to avoid any melting issues.
If problem persists I'd try a downcut bit.
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