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What if hobber has feed change gears and a stepping lever?

April 26, 2017feed gears hobber lever stepping

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What if hobber has feed change gears and a stepping lever?

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Some machines use a set of change gear pairs plus a control lever. This allows fewer change gears for a wide range of table feed rates. The Seiwa hobber uses 4 pairs of gears to provide table feed range from 0.40 to 4.6875 mm/rev. Unlike dial feed, this feed design makes feed accurate and predictable, which makes Dual cutting of large primes possible.