For Deep-Hole Peck Drilling

The Blackalloy™ Model 150, Model 250 and Model 350 Series Drill Units are available with up to 6" Peck Drill Control. The Drill Unit is factory equipped with a special Peck Feed Cylinder and Pneumatic Control Kit which together perform the Peck Drill Control. Peck Drill Control can also be added in the field to any Model 150, 250 or 350 Drill Unit.

Pecking Models include a special Pneumatic Control Kit which does not require any electrical wiring. The drill cycle is achieved by a modular pneumatic control unit that includes two timers. The timers control the length of time for the forward and return strokes. The forward stroke time is directly related to the drill depth increment per cycle. These times are easily tailored in the field to any drilling situation that may be encountered.

The special Peck Feed Cylinder performs three functions. It allows a rapid advance to a point only slightly before the drill contacts the work. This minimizes the cycle time. It's second function is to control the feed rate during the actual drilling portion of the cycle. This rate, which is easily adjusted, is precisely controlled through the unit's leak proof hydraulic metering system. The final function of the Peck Feed Cylinder is to "remember" the last drill depth during the return cycle. It does this by a built-in clamping system that locks the cylinder during its return stroke. The subsequent forward stroke begins at the previous cycle drill depth. This allows the cycle time to be minimized for optimum performance and prevents damage to the drill bit when the drill re-enters the hole.

This repeat cycle continues until the hole has been drilled to the desired depth. This depth can be set on the Drill Unit to within a few thousands of an inch by using the stop rod assembly which is a standard feature of every Drill Unit. At the same time as the desired drill depth is reached a pneumatic limit switch is tripped to signal the Dill Unit to retract to the home position and wait for the next drill cycle.



Model 153 & 253 Drill Units with Peck Feed Control Cylinders

Model Drill Units Stroke
"A"
Model 153
"B" "C"

"Y"

"Z"
153-1.5 1.5 8.41 1.88 5.62 4.06
153-2 2 9.41 1.88 6.13 4.56
153-3 3 11.41 1.88 7.13 5.56
153-4 4 13.41 1.88 8.13 6.56
153-6 6 17.41 1.88 10.12 8.56
153-8 8 21.41 1.88 12.12 10.56
Model Drill Units Stroke
"A"
Model 253
"B" "C" "Y" "Z"
253-1.5 1.5 9.56 3.03 5.62 4.06
253-2 2 10.56 3.03 6.13 4.56
253-3 3 12.56 3.03 7.13 5.56
253-4 4 14.56 3.03 8.13 6.56
253-6 6 18.56 3.03 10.12 8.56
253-8 8 22.56 3.03 12.12 10.56
Dimensions in Inches

Feed Stroke "A1" 1 2

3

4 6 & 8
"D" 6 8 10 9.6 Consult Factory
"E" 1.38 1.38 1.38 1.1
Dimensions in Inches

 

Model 353 Drill Units with Peck Feed Control Cylinders

Model #

Stroke

A B
350-1.5 1.5 4.75 6.475
350-3 3 6.25 7.975
350-6 6 9.25 10.975
350-8 8 11.25 12.975
Dimensions Drill Units (Inches)

 


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Blackalloy Company of America • 1836 Lonestar Street • Unit 3 • Conway, SC 29526

Tel: (843) 347-3390 • Fax: (843) 347-3391

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