M K(@mkadnk):Are you trying to hold a .001" profile? You need to manage tool deflection. A spring pass runs the same toolpath a second time,ideally cutting nothing, but you can still hear how much material was left from deflection on the first pass. That same deflection will also put a taper on the part. If you’re using a face mill, run an indicator across the surface after the cut and you’ll usually find it isn’t flat; .003" of variation is common. Drop the face mill another .001", it skims the peaks and leaves the valleys, and you can walk the part into a flat surface that way.

M K

@mkadnk

Co-founder and lead machinist at Box-K CNC LLC. Message me and let me know how we can help you!

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M K@mkadnk

2026.07.29 17:08

Are you trying to hold a .001" profile? You need to manage tool deflection. A spring pass runs the same toolpath a second time,ideally cutting nothing, but you can still hear how much material was left from deflection on the first pass. That same deflection will also put a taper on the part. If you’re using a face mill, run an indicator across the surface after the cut and you’ll usually find it isn’t flat; .003" of variation is common. Drop the face mill another .001", it skims the peaks and leaves the valleys, and you can walk the part into a flat surface that way.