Topic outline
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Title of Course:
Perform Lathe Operations
NOMINAL HOURS: 50 Hours
Course Summary:
This unit covers the knowledge, skill, and attitude required to set up and turn workpieces to drawing specifications. It includes Face and turns external shapes (radii, cones), Multi-start external v-thread cutting, Cutting inside taper using taper turning attachment or offset tailstock and compound method, turning internal thread.
Course Structure
REQUIREMENT
LATHE OPERATION
COMPLETION
OSH
Practice Materials for the Lathe Job symbol
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Multi-start external v-thread cutting
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taper turning
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turning internal thread
Complete safe
shutdown
Housekeeping
procedures
Learning Outcome:
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Identify how to perform the multi-start external v-thread cutting.
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Identify how to perform a taper turning operation.
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Identify how to perform turning internal thread operation.
Teacher
Rafia Sultana
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Lathe Accessories by Rafia Sultana
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1.Multi-start external v-thread cutting
External Threads Formulas
Picture
1. Major Diameter: Given On Print (if it is a machine screw #0-14 SEE NOTE 1A).
2. Pitch: 1/number of threads per inch.
3. Flat: pitch/8.
4. Compound Movement: .75(pitch).
5. Single Thread Height: .75(pitch) (cosine 30 degree's).
6. Pitch Diameter: major diameter - single thread height.
2.Face and turn external shapes (radii, cones) operation
3.Cutting inside taper using taper turning attachment
or offset tailstock and compound method:
Taper Turning Formulas
Picture
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When the feed is given to the tool, its cut at an angle to the axis of the workpiece produces a taper.
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You can calculate the set over the length with the formula:
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S=L*(D-d)/2l, l: taper length, L: total job length, d: smaller diameter, D: larger diameter.
4. Turning internal thread
How to Cut an Internal Thread:
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Centering with a punch and then drill a core hole with the twist drill.
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Use the 90°countersink to countersink into the core hole and make a chamfer.
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Put the tap into a tap wrench and turn it into the core hole to cut the thread.
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