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90 MMS August 2017 mmsonline.com BETTER PRODUCTION Shops Using Technology HANSEN ENGINEERING CO. PROBLEM Toolholder expansion reduced spindle contact causing a variety of production issues SOLUTION High-torque retention knobs from JM Performance Products Inc. RESULTS Increased productivity, reduced downtime E D ITO R E M I LY PRO B S T, e p r o b s t @ m m s o n l i n e.c o m Overcoming Toolholder Deformation with High- Torque Retention Knobs W h e n a t o o l h o l d e r expands, it cannot make full contact with a machine tool's spindle, causing vibration, chatter, p o o r to l e r a n c e s , n o n - r e p e a t a b i l i t y, p o o r f i n - ishes, shortened tool life, excessive spindle wear and tear, runout, and shal- low depths of cut, among other problems. Hansen Engineering Co. (Harbor City, California) remedied its production issues by converting to high-torque retention knobs from JM Per formance Products Inc. (Fairpor t Harbor, Ohio). This reportedly increased the aerospace engineering shop's productivity by 15 percent and decreased downtime. Established in 1962, HEC is an approved Air Transpor t Association supplier of precision- machined multi-axis parts and major structural assemblies. The shop specializes in complex MDI surface geometry, statistical process control and Hansen Engineering Co. used a standard retention knob in the toolholder on the left. Taper deformation prevents the toolholder from properly mating with the CNC machine's spindle, however. In contrast, the photo on the right shows use of JM Performance Products' high-torque retention knobs in the tool- holder. A longer design enables the knob to reach deeper into the holder's threaded bore, improving taper-contact quality.