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SLOW-SPEED (Drive 1 on charts) and FAST-SPEED (Drive 2 on charts) are determined by 15 and 27-tooth sprocket assemblies. Drive 1 uses the small-top (A) and large-bottom sprockets; Drive 2 uses the large-top (B) and small-bottom sprockets.
Use the SLOW-SPEED drive whenever possible for maximum efficiency and to minimize wear. Use the FAST-SPEED drive for drilling larger quantities.
A-Slow Speed Sprocket
B-Fast Speed Sprocket
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