Tips to Prevent Waviness and Ripples


Consider the overall job when you have a problem with waviness and ripples.

Tool Assembly

Cutting tool assemblies with runout higher than 0.0003” (0.008mm) can leave waviness and ripples on the walls of the part.

The tool assembly must be balanced for high-speed applications. A tool assembly that is out of balance can cause vibration and leave a wavy and rippled finish.

Balance the tool holder with the cutting tool. If you cannot balance the tool assembly, replace it with one that you can balance.


Incorrect servo gain or acceleration parameters can cause the machine to leave a wavy and rippled surface finish.

Contact your Haas Factory Outlet to have the machine's parameters checked and corrected if necessary.

Machine accessories like the chip conveyor, chip auger [1] or Side Mount Tool Changer (SMTC) [2] can introduce vibration into the machine causing waviness/ripples to appear in the side walls of your part.

Turn off the chip auger, chip conveyor and pre-stage the next tool before the finish cut starts.


Vibrations from external sources can transfer into the machined finish and appear as waviness and ripples.

Before you start the finish cut, stop nearby forklift traffic, crane operation, and welding operations.

Be aware: Many service and repair procedures should be done only by authorized personnel. The service technicians at your Haas Factory Outlet (HFO) have the training, experience, and are certified to do these tasks safely and correctly. You should not do machine repair or service procedures unless you are qualified and knowledgeable about the processes.

Danger: Some service procedures can be dangerous or life-threatening. DO NOT attempt a procedure that you do not completely understand. Contact your Haas Factory Outlet (HFO) and schedule a service technician visit if you have any doubts about doing a procedure.