The tool holder is a quick-change standard with .07" radial float. Taps can be interchanged in seconds using only one hand. The tapping cycle is a precision CNC emulation of the required thread pitch (CNC rigid tapping) The automatic load / unload fixture featured doweled datum positions for systematic change-over and processing either of the two locknut variations (see above tapped parts) In turn, two inter-changeable feed track sub-assemblies are supplied on separate bases with a precision quick-change inter-lock system for re-aligning the feeder bowl and feed track when changing over the style of locknut that is being processed.
Two complete feeder bowl assemblies with customized handmade rotary tracking and pneumatic accessories are included in this system. Feeder bowls are also quickly interchanged using precision corner datums and a pneumatic manifold block with quick-disconnects.
The bulk hopper feeder automatically maintains the level of parts in the feed track. Hopper capacity enables approximately 8 hours of unattended operation.
The work area is totally enclosed when the machine is operating. One of the hinges on the enclosure cover, features a safety interlock switch.
The tapping unit is a Zagar MQ150 ball screw actuated quill feed unit with an in-line, low inertia spindle motor mount. This standard configuration of the MQ150 unit and it's control system have been used in production to synchronize with stamping operations at production rates as high as 240 parts a minute or 4 cycles per second.
(click on graphic for e-view)
Hi-Speed, Multiple Spindle, CNC Tapping
In this example a Zagar, gearless, 4 spindle tapping head and a vertical, MQ150 CNC drill-tap station are applied to tapping (4) # 8-32 holes thru a steel stamping. The spindles are equally spaced on a .750" (19mm) diameter bolt circle. Each spindle features a quick-change, Zagar standard tap holder. The stampings or work pieces, are automatically transferred under the tap station, using a dial index table supplied by the end user. In production, the tapping station has to complete the tapping operation in less than .75" seconds which is the cycle shown (see above video)