Welcome to the Router Forums.
I have a few questions.
Do you have any pictures of your machine and of the cut left when cutting the plywood? You can post pictures that are on your computer.
Is this new plywood or has it been stored for a while where it might have been subjected to heat or moisture? How thick is the plywood?
What size bit are you using? Is your feed rate, spindle speed and depth of cut correct for the bit, material and machine?
What kind of CNC machine do you have? Homemade MDF, DIY kit, plug and play hobby machine or something else? Is there any looseness in the machine and if so can it be adjusted to tighten up the machine?
Do you have a spindle or a router? Could the mount be loose? Have you checked the collet for runout? Are the bearings good or could they be causing runout?
It does help when you fill out your profile with the tools and other information about your shop.
Your BRAIN Is The Most Important Power Tool In Your Shop. Turn It On Before You Turn On Any Other Power Tool.
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Last edited by MEBCWD; 08-02-2018 at 10:27 AM.