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Issue link: https://mms.epubxp.com/i/850702
BETTER PRODUCTION Shops Using Technology 92 MMS August 2017 mmsonline.com by wear marks at the top and bottom of the hold- ers; fretting appeared on contact surfaces; and increasingly long cycles developed. These per- sistent problems led to increased production shutdowns to allow the machines to cool off for significant periods of time. Additionally, poor finishing and chatter problems were recurring when roughing aluminum, titanium and stainless steel for forging jobs. W h e n a s t a n d a r d r e t e n t i o n k n o b i s installed in a V-flange to o l h o l d e r, p r e s s u r e e x e r t e d b y t h r e a d engagement, coupled with the elastic proper- ties of the steel used to manufacture the tool- holders, creates a bulge at the small end of the holder. Once expansion occurs, the holder will not pull all the way into t h e s p i n d l e, a n d t h e toolholder cannot make contact with upwards o f 70 p e r c e n t o f t h e spindle surface. R e c o g n i z i n g t h e design flaw inherent in CNC V-f lange tooling that was responsible for costly CNC milling and b o r i n g i s s u e s, J M PP designed high-torque r e te n t i o n k n o b s t h a t could be used in existing toolholders to eliminate the bulge. These pat- ented high-torque reten- tion knobs are longer and reach deeper into the holder's threaded b o r e t h a n s t a n d a r d knobs. As a result, all t h r e a d e n g a g e m e n t occurs in a region of the toolholder where there is a thicker cross section .com " " electronic probing of part surfaces. The majority of its high-speed CNC machines operate within a 10,000- to 15,000-rpm range, cutting large blocks of titanium, stainless steel and aluminum for an array of aerospace products. Over time, the company's everyday machining operations began to present increased issues. For example, toolholders were getting stuck in the spindle due to deformation factors evidenced