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Speed Matters feature Speed Matters – In Racing and in Hobbing RCD Engineering’s switch from manual to CNC hobbing operations breaks gear manufacturing lead time records with Bourn & Koch 100H in their gear production pit crew Joe Goral Sr. RCD Engineering (Race Car treating, sent out for finish grinding (4 have cut our lead time on these gears by Dynamics) is a 50-year-old days shipping there and back), and final- 50%.” Northern California manufac- ly applied finish coating.” turer of starters, blower drives, This long, nine-step process took 50% Faster Overall Production crankshafts, camshaft drives about eight weeks, but it could go even AND 30% Faster Gear Cutting and other components used by longer if their finish grinding source was Cycle Times National Hot Rod Association backed up. After bringing the Bourn & “In addition to eliminating finish grind- drag race teams and other rac- Koch 100H gear hobbing machine on to ing operations,” explains Leach, “we have ing circuits to move at speeds their team in 2016, though, RCD has cut noticed about a 33% faster run time on of 300+ mph. the process down to just four steps and the hobbing operation alone versus our For many years, RCD relied on an old has eliminated the need for finish grind- old mechanical hob.” And because RCD manual Barber-Colman 6-series gear ing services altogether. tricked out their 100H with the option- hobbing machine (built in the 1960s) The key to changing the process was al deburring attachment, they found to create idler gears used in their cam- being able to cut heat-treated blanks they could eliminate manual deburring shaft drives; but they were experi- (Rockwell 46-48) and clock the gear operations as well. They were able to encing long lead times with their fin- teeth to the timing marks or mount- bring the deburring process inline on the ish grinding operations and wanted to ing holes on the new equipment while 100H and complete it in one setup. make a change. Jason Leach, Production achieving the same AGMA 10+ quality The 100H is part of Bourn & Koch’s Manager at RCD, explains the old pro- as RCD’s customers had come to expect. line of H-Series horizontal gear hob- cess: “We cut blanks, machined the gear “Since purchasing the 100H, we have bers. H-Series machines are designed to blank front and back, roughed the teeth changed our process,” says Leach. “We produce AGMA Class 10+ quality exter- in, milled the holes (they need to be now cut blanks, heat treat the blanks, nal spur and helical gears in a compact clocked to the teeth), deburred manually, machine gear blanks front and back on footprint. The machines are manufac- sent the gears out to heat treat (4 days our turn mill complete with holes and tured and assembled in Bourn & Koch’s shipping there and back), recut bore and timing dots, then rough and finish the Rockford, Illinois facility by precision faces of the gears to true up after heat teeth on our Bourn & Koch 100H. We machine tool builders with decades of experience. Each machine is CNC-controlled with servo-motion on precision linear roller ways, hand-scraped bearing sur- faces and accurate ball screws for eas- ily achieving high tolerances. Bourn & Koch’s conversational HMI with full touch-screen control panel guides the operator through the gear cutting pro- cess, reducing the need for specialized training to operate the machine. In fact, the HMI on the 100H allowed a new user with just one AGMA basic gear manufacturing training class and less than 40 hours of training and gear hob- bing experience to cut a sample gear at least 25% faster than an operator with 40+ years of experience could cut the same gear on an old, manual Barber- Colman (see details of the time study in Standard Bourn & Koch sample hobbed on Barber-Colman 6-10. the sidebar). Leach confirms that the transition [www.geartechnology.com] 34 GEAR TECHNOLOGY | August 2017 to the CNC machine was smooth. “We their OEM archives. 125+ years of paral- RCD is a Fan of Bourn & Koch’s bought the 100H to replace our old lel OEM records (from 1889 to present Adjustable Speeds and Feeds Barber-Colman 6-10 mechanical hob, day) are being carefully preserved in the “Our Barber-Colman was doing eight and the learning curve was not nearly climate-controlled Bourn & Koch facility. gears per hour… rough cut only,” as steep as I expected. The CNC control The valuable archives consist of all explains Leach. “On the Bourn & Koch is very user friendly and easy to learn. original assembly drawings, bills of 100H, we initially set up the machine The process for creating the programs is material, electrical diagrams, hydrau- to rough and finish cut one gear in four s i mp l e .” lic schematics, detail prints, and minutes (which is 15 gears per hour).” RCD enlisted Bourn & Koch’s help to spare parts inventories from over 30 RCD was impressed with that speed, create the program that ensured the gear American-made classic machine tool but also with the fact that they could use teeth were clocked to their mill work in brands — including Fellows, Barber- the “Speed and Feed Change” feature to the same place for each gear. This ser- Colman, Devlieg, Bullard, Motch, Jones tweak the speed-to-quality ratio. “We vice got RCD’s CNC program on the & Lamson, Acme-Gridley, Blanchard, slowed the finish feed down a little to right track. But one of the biggest advan- Brown & Sharpe and many more. Add reduce the distance between scallops and tages for RCD of moving from Barber- up the number of years each machine improve the AGMA rating.” They now Colman to Bourn & Koch was the com- tool company existed and you arrive at run 10-11 gears per hour with rough patibility of the tooling. 2,500 years of combined engineering and finish passes resulting in an AGMA know-how. 12-14. This was the perfect balance of 100% tooling compatibility In keeping with Bourn & Koch’s phi- speed and accuracy for the idler gears. between the old and new losophy of retaining the best features on “The great thing about this machine,” Workholding can be very expensive to legacy machine tools, the company had Leach concludes, “is the range you have replace. So, the fact that Barber-Colman the foresight to retain compatibility with to adjust feed and speeds easily to fit 6-10 model tooling is compatible with spindle bolt patterns so that customers your needs.” The 100H gear hobber with the new Bourn & Koch 100H means would have an easier time making the Bourn & Koch HMI is available with companies can benefit from a lower transition to Bourn & Koch’s 21st century a standard Fanuc 0i-F CNC — other investment moving from manual to machine tool offerings. options for CNC controls are avail- CNC operations. The same bolt pattern used on the able as well. The control includes the One reason for the compatibility? spindle of the Barber-Colman 6-10 Automatic Single- or Double-Cut Cycles In 1985, Bourn & Koch, Inc. acquired model gear hobbing machines is used (with speed and feed change between the machine tool division of Barber- on the new Bourn & Koch 100H hob- cuts) as well as Crown Hobbing or Taper Colman. And since then, Bourn & Koch bing machines. And the larger Barber- Hobbing Cycles, Automatic Hob Shifter have continued the tradition of manu- Colman 16-16 and 14-15 models are (with parts per shift counter), and facturing world-class gear manufactur- compatible with new Bourn & Koch Power-Programmable CNC Hob Swivel ing machines in Rockford, Illinois, just 400H gear hobbing machines’ bolt pat- for accurate setting of hob slide. a few short miles from where Barber- terns as well. This compatibility allows Colman once did the same. RCD and other Bourn & Koch custom- Beyond the Machine — Custom Another reason for the compatibility ers to use their existing collet chucks, Workholding, Cutters, and High is that when approaching a new machine face drivers, and other workholding Quality Service design, customization or re-engineering devices on brand new equipment. “Having good fixtures is paramount challenge, the Bourn & Koch team can in manufacturing quality gears,” states draw from the years of time-tested engi- Leach. “We purchased one workholding neering know-how available to them in fixture from Bourn and Koch to elimi- August 2017 | GEAR TECHNOLOGY 35 feature SPEED MATTERS – IN RACING AND IN HOBBING 100H gear hobbing machine in the near future, including some gear sets for starter motor gear heads and helical bronze gears for their magneto drives. The Bourn & Koch crew say they will be ready to help RCD light ‘em up! For more information: Bourn & Koch 2500 Kishwaukee St. Rockford, IL 61104 Phone: (815) 713-2316 [email protected] www.bourn-koch.com RCD Engineering 17100 Salmon Mine Road Nevada City, CA 95959 Phone: (530) 292-3133 www.rcdengineering.com Star SU 5200 Prairie Stone Parkway, Suite 100 Hoffman Estates, IL 60192 Photo of hobbed RCD Engineering 48T 10 D.P. 11 hole Vernier Phone: (847) 649-1450 cam gear in Bourn & Koch engineered face clamping fixture. [email protected] www.star-su.com nate any issues during the part run-off rate, modern 100H gear hobbing prior to machine delivery. We were pro- machine that had the ability to rough Joe Goral Sr. started vided a print with our fixture so that and finish cut heat-treated blanks for working for Bourn & we were able to design and make our their crankshaft and camshaft gears; Koch in September of own work holding fixtures for our other match the gear teeth to timing dots; 2013, providing support service for Bullard & other g e ar s .” and eliminate the need for finish grind- vertical turning machines.
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