The Feedrate is Too High
The programmed feedrate may be too high to cut smoothly through the programmed direction changes.
Reduce the programmed feedrate. Refer to the tooling manufacturer's instructions for guidance as to the best speeds and feeds to use for the tooling and workpiece material. Test-run your application and use spindle speed and feed overrides to find a good speed/feed combination.
Sharp Corners on the Cutting Tool
Cutting tools with sharp corners can leave coining marks on the floor of the surface being machined.
Change to a tool or insert that has a corner radius or a corner chamfer.
Sharp Angles in Toolpath
Add a fillet radius (G02/G03) to the sharp angles in your program. This lets the machine cut the angle more gradually and prevents the sudden motion that can cause coining.
The FIR Filter Parameters Have Incorrect Values
The FIR (Finite Impulse Response) filter is a Haas software feature that uses the servo motor to achieve higher acceleration rates with smoother transitions, reduced cycle times, and reduced vibration from machine motion. FIR filters come standard and are always active on all Haas mills with M17.00 and newer software and Haas lathes with L10.00 and newer software.
2) Time in milliseconds
A) Velocity without FIR Filters
B) Velocity with FIR Filters
C) Acceleration without FIR Filters
D) Acceleration with FIR Filters
The FIR filter parameter values must match on all linear and rotary axes, or accuracy and surface finish issues will appear.
The correct value for these parameters is 64 for all Haas mills.
FIR Filter Parameters
786 (X Command FIR Order)
787 (Y Command FIR Order)
788 (Z Command FIR Order)
789 (A Command FIR Order)
790 (B Command FIR Order)
791 (C Command FIR Order)
The Notch Filter Parameters are Incorrect
Vibration from External Sources
Vibration from other machines, shop equipment, heavy machinery, passing trains, etc. can cause finish problems.
Stop other machines, forklifts, overhead cranes, etc. during cutting. This may be helpful if the machine’s foundation is inadequate.
Insufficient Drawbar Hold Force
The drawbar is a spindle component that holds the tool in place with spring force. Over time, the springs can wear and reduce the drawbar hold force.Corrective Action:
Measure the machine's drawbar hold force. Refer to the Drawbar Force Reference Chart for the drawbar force range for your spindle.
If it is insufficient, order a replacement drawbar from parts.haascnc.com.