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How to fix bits smaller than actual sizes?

Discussion in 'CNC Mills/Routers' started by jeffmorris, Mar 31, 2018.

  1. jeffmorris

    jeffmorris Journeyman

    Nov 6, 2017
    Likes Received:
    I started cutting out a car puzzle from CNC Make website but the pieces won't fit into holes. How do I compensate (?) for bits smaller than actual sizes?
  2. Giarc

    Giarc OpenBuilds Team
    Staff Member Moderator Builder Resident Builder

    Jan 24, 2015
    Likes Received:
    If you are saying your bit is smaller than the stated size which caused parts to not fit correctly, the answer to that problem is to measure your bits with a caliper and input the actual bit size into your CAM program so it can calculate the cuts accordingly. I measure every endmill I use. The 1/8 inch cheap chinese endmills SHOULD be 3.175 mm, but when I measure them, they have varied from 3.16 to 3.17. I have yet to get one which is actually be 3.175mm.

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