Program: Welder Foundation Certificate (CIP 48.0508) - northern equipment catalog
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Also note that to correct for a broad feeler gauge or a loose-fitting drill bit: ROC = (D2-W2)/8T Where: W = the width of the feeler gauge, or if the drill bit can be moved back and forth under the straight edge by the total amount W D = mirror diameter, T = gauge thickness or bit diameter.
Much lighter and easier to control than flex-shaft powered or plug-in engravers, this battery-powered engraver is ideal for fine work. It can be used effectively on steel, ceramic or glass and is the best we have found for engraving slate. The 3/64" (1.3mm) diamond ball tip is easy to control, primarily because it has virtually no vibration. The rotary cutting action will not chip or shatter materials as a reciprocating engraver can.
The engraver works best if held at the same angle as you would a pencil, 30° to 40°. The two included AAA batteries will last for hours of cutting time, depending on the pressure applied. 6" long overall.
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