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苏联明斯克摩托车和自行车厂里研制并使用了具有大螺旋角刀齿的铰刀(见附图)。它可用来在铸铁和有色金属零件上加工连续孔和间断孔。直径D=5～50毫米的铰刀上有3～8个刀齿,刀齿相对于铰刀轴线具有较大的螺旋角ω(60°～70°),因而能保证高的加工精度和质量。
A reamer with a large helical angle tooth was developed and used at the Minsk Motorcycle and Bike Factory in the USSR (see photo). It is used to machine continuous and discontinuous holes in cast iron and nonferrous metal parts. There are 3 to 8 teeth on the reamer with diameter D = 5 to 50 mm and the teeth have a larger helix angle ω (60 ° to 70 °) relative to the reamer axis, thus ensuring high machining accuracy and quality .