Production Machining

SEP 2017

Production Machining - Your access to the precision machining industrial buyer.

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CNC Broaching with a Driven Broach Head Edited by Chris Felix :: (Above) The driven broach head changes the rotary motion of the turret drive into a linear reciprocating motion with a drop down on the retract stroke for tool clearance. 42 PRODUCTION MACHINING :: SEPTEMBER 2017 CASE IN POINT B ecause of the importance of speed in the manufac- turing industry, one must consider the measure- ment of shop time as a key factor for profitability. How long CNC machines are tied up with one part and the time each process takes to complete is evaluated constantly and plays into the pricing of products all the way down to consumers. Saving even a tenth of a second in the production process can have a huge impact. at is how valuable shop time is. So, a shift from 20 parts per hour to 120 could be monumental. CNC Broach Tools, a manufacturer of inserted broaching tools, had a high-volume OEM client in Fort Smith, Arkansas, that had been using the company's tooling on its CNC lathes for more than a decade. e OEM cut mainly motor shafts that were made from tough 56 HRC 4140 and the blind keyway ended into a cross- hole relief. Depth of cut per pass was 0.0006 inch and speed 180 inches per minute. e client wanted to switch from broaching its keyways with the motion of the lathe turret to using MD Tooling's driven broach head so it could use the lathe's live tool capabilities. e client's volume justified the capital invest- ment of the live lathe tooling, and the broach head would eliminate wear on the lathe slides (which could lead to premature failures or inaccuracies). e live tool broach

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