A stepping crank for numerical control lathe

The utility model discloses a stepping crank for numerical control lathe, a stepping crank for numerical control lathe contain a hollow bulb of handling knob, the afterbody of the bulb of handling knob be equipped with a locking screw, the head of the bulb of handling knob be equipped with an annular sleeve, the bulb of handling knob in be equipped with a bacillary connection stock, the connection stock contain a hollow pipy stock main part, the head of stock main part be equipped with a location nut and one connect the spiral shell head, a pair of support bearing is provided on the stock main part, support bearing be provided the sleeve in. The utility model discloses a stepping crank for numerical control lathe utilizes a pair of support bearing in the stock main part, has replaced current single bearing arrangement, has improved the bulb pivoted ride comfort of handling knob greatly, simultaneously, can effectively prevent to connect the stock bending deformation that leads to because of the atress inequality, has improved the life of crank.