MC Machinery/Mitsubishi Wire EDM Used for Machining Hunting Bow Triggers

Wire EDM used for machining hunting equipment

July 10, 2014 11:02:35 AM

The latest in wire EDM technology from MC Machinery/Mitsubishi EDM is now being strategically used to build and manufacture hunting bow triggers for Realtree. EDMs are now producing core parts such as the trigger unit, thumb trigger, riser, pulley system and cam.

The trigger unit is a bow string gripping system that allows the shooter to gain a mechanical advantage for the process of gripping the string, pulling it back, comfortably holding it through the aiming process and releasing it cleanly.

There is a total of four parts in the trigger system that require very precise machining to preserve the light release feel, but still maintain the proper lock on the string while aiming. To achieve proper use, these very small parts require a 100 percent square edge surface that is completely burr free.  

The thumb trigger has an entire intricate profile that pivots on a post holding the rocker arm while rubbing on the tensioner which sets the release pressure with an adjustable tensioner.

The rocker grips the string clamp on a very small surface which requires perfectly matched surfaces for proper operation. Each of the parts except the string clamp use coil springs for proper tensioning and they require flat surfaces to maintain proper alignment.

The riser is the primary component of the bow frame and is held by the archer during use. It is made from aluminum, which has a good strength-to-weight ratio. It takes 40 minutes for this complex geometry to be milled.  

The pulley system uses cables and rotating cams to allow longer distance. The cams are made from aluminum, with a unique design for each bow model. Aluminum is cost effective and provides flexibility during production.

With a minimum standing order of 2,000 parts at any one time, wire EDM has been found to be the most accurate, burr-free single operation method to economically produce these small parts. The blank material is setup in stacks so several parts can be produced at a time with repeatability that is unmatched by any other multi-setup machining process.

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