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moldmakingtechnology.com 35 Here, the rotating axis stops at each straight section and then starts rotating again. is rotated on a lathe. The head inclination is often to the A or B axis, depending on the mill configuration. In this scenario, many CAM systems keep the rotating axis normal to the faces being milled, lock- ing the inclination to avoid head collisions. This method can work in many situations, but it can be problematic when milling a part's concave regions, where remaining normal in the one axis would cause collisions between the part and machine spindle (see Figure 4). Here, automatic collision avoidance is the preferred method of calculating the CAM cutter path on the part. This involves pro- gramming software that automatically rotates the tool, holder and spindle to avoid collisions with the part dur- ing milling. However, some important programming options will work better than others for this type of milling. Many five-axis CAM algorithms modify the constant rota- tional axis to avoid a collision, then rotate the axis back to a FIGURE 6 which entails the part being mounted to a table that can spin continuously or the head of the mill spinning around the part continuously. In this case, the tool and spindle are inclined at an angle necessary to reach the deep areas while the part is rotated during the milling process. This is not unlike how a part Y o u r g l o b a l m e t r o l o g y p a r t n e r • w w w . m a r p o s s . c o m Keep an eye on your tools! V i s u a l T o o l s e T T e r Tool inspection with front lighting u r g l o b a l m s e T T e r T o o l i n s f r o n t Tool measurement with shadow projection increase The Value of your Tools: ■ Measurement of tool diameter, length, run-out and cutter radius ■ range of tool diameter from 10 μm to 40 mm ■ resolution 0.1 μm ■ repeatability < 0.2 μm ■ Measurement independent of tool geometry ■ Thermal drift compensation ■ fast and reliable on machine results See us at EASTEC Booth #3008