1、2OverviewnGeneral operations on the lathenThree elementsnLathe safety precautionsnTurning operations3turning4facing5boring6drilling7threading81.Three elements Cutting speed Feed Depth of cut910（1）Cutting speed VcDVSC100011Materials to be worked on Aluminum Steel,high carbon Steel,medium carbon Steel
2、,low carbon Steel,stainless12Material of cutter bit Carbon steel tool High speed steel tool Carbide tipped tool13Spindle speed1.If D=63mm,S=300r/min,then Vc=?2.If D=63mm,S=600r/min,then Vc=?3.If D=63mm,S=900r/min,then Vc=?1000SDVc14（2）Feed f Feed DD21Unit:mm or inch per revolution1 inch=25.4mm15Feed
3、 and surface finish Rough cut-heavy-poor finish-lower speed Finishing cut-light-fine finish-higher speed0.010.02in or 0.2540.508mm16Feed rate and surface finish1.If S=800r/min,f=0.1mm,then Vf=?2.If S=800r/min,f=0.3mm,then Vf=?3.If S=800r/min,f=0.5mm,then Vf=?The feed determines the surface quality.S
4、fVf17（3）Depth of cut18Depth of cut and surface finish Rough cut-heavy-poor finish-lower speed Finishing cut-light-nice finish-higher speed3/161/4in or 4.7636.35mm192.Lathe safety Wear safety glasses,work shoes Avoid loose sleeves,long hair,jewelry 20Safety glasses21Chuck guard22Chuck key with spring
5、23Do not use compressed air when cleaning machines.24Always use the left-handed filing method on a lathe.25Handle heavy chucks with care and protect the lathe ways with a block of wood.263.Turning operations Chucking the work Adjusting the tool bit Setting speed and feed Turning with hand feed Turni
6、ng with power feed Measuring the diameter Filing the edge27Chucking the workSafety:?Cylindrical job Insert Tighten Rotate Tighten Remove28Adjusting the tool bit Near the free end Touch the side of the work Just beyond the free end29Setting speed and feed 45#low carbon steel,1.5”S=?Feed=?30Turning wi
7、th hand feed Adjust the depth of cut using cross slide crank Start the spindle Move the carriage towards the headstock with carriage handwheel Stop the spindle Retract the tool Adjust the depth of cut for the second pass Repeat the above procedure31Turning with power feed Turn the motor on Adjust the depth of cut Engage the power feed lever32Measuring the diameter33More34File and filingTang end35Dial caliper36micrometer37习题答案请扫描关注“机电双语学堂”38
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