The DELTA 15-231 includes motor and controls, Belt and pulley guard, Belt and motor pulley (supplied wit 5/8" bore unless 1/2" bore is specified), Self-locking depth stop,, Depth gage, Self-ejecting chuck key
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Extra-large spindle bearings "6 PLUS 6" and "VS6" spindle and spindle pulley are supported by four over-sized, pre-loaded, lubrcated-for-life ball bearings. Massive quill is a full 2" diameter. "VS6" has the same excellent construction, PLUS an extra bearing below the spindle pulley. This fine combination of features assures freedom from chatter, long, maintenance-free life and maximum pressure at the drill point.
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Wide, test-proven speed range gives you a true 10-to-1 speed ratio. You get the exact speed you need for every drillingjob on any material- 450 to 4700 rpm with a 1725 rpm motor and 300 to 3100 with an 1140 rpm motor.
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Quick belt tension release is provided by the pivoting motor mounting plate which has a reverse, self-locking taper on the spring loaded, rubber-tipped plunger that quickly restores correct belt tension.
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Extra-long quill travel gives the extra depth you need for deep-hole jobs like skip and gang drilling... PLUS, the extra stroke required for clearing jigs and fixtures.
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Six speeds offer unbelievably wide range of speeds with a low-cost 1725 rpm motor- 425, 600, 1100, 2050, 3900 and 5500 rpm- 11.8 to 1 speed ratio. You can choose an extra-slow speed for drilling very hard materials... an extra-fast speed for working soft materials... or an optimum speed for any size bit material.
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Efficient variable-speed drive lets you select any spindle speed instantly while machine is running. A self-locking cam, plus a "snubber" feature, hold speed settings constant under all load conditions. Proper belt tension is automatically maintained for full power transmission.
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