Challenge CH-EH3, Руководство оператора

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6.0 Operation
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outside of each head. This moves the heads along a shaft. A scale and pointer located at the front of
the heads gives a reading in inches and millimeters of the center-line relationship to the center head.
When a setting is made, make certain that the clamp knob is tightened again.
Any combination of three heads can be used, that is one, two, or three holes may be drilled if desired.
It is recommended, however that no more than two half inch hollow drills be used at the same time.
6.5 Setting the Backgauge Position
The backgauge position is adjusted by first loosening the two thumb screws under the table. This will
allow the backgauge to move freely. Then use the two scales on the top of the table to set the
backgauge to the desired position. The scales read in inches and millimeters and will give the
distance from the edge of the sheet to the center of the holes. Be sure the 1” (2.5 cm) square pieces
mounted to the backgauge are aligned on top of the scales to provide the proper reading (Figure 1 on
page 8). Tighten the thumbscrews when finished.
6.6 Using the Side Guide
To adjust the position of the side guide, loosen the two black knobs until the side guide is free to slide
sideways. Slide the side guide to the desired position and then tighten the two knobs. For certain
hole positions, it may be necessary to remove the rectangular spacer from the side guide assembly
(Figure 7).
Figure 7
6.7 Adjusting the Stroke Speed
The hydraulic unit is equipped with an adjustable valve for regulating the speed on the drill stroke (up
and down travel). Soft stocks such as mimeographs, etc., are apt to wrinkle at high speeds, and the
speed should be set to a point where the best results are obtained.