 | Setting-up and Operating of Regular Engine Lathes - Course: Techniques for Machining of Material. Instruction Examples for Practical Vocational Training |
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Instruction example 1.3.: Clamping and aligning of workpiece and tool
Material:
20 Mn Cr 5 low-alloy steel, 0.2 % carbon, 1.2 % manganese, less than 1 % chromium, rest: iron
Figure
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Tools |
Auxiliary means |
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Internal corner tool |
Gripping jaws that can be bored |
Measuring and testing tools
Vernier caliper
Dial gauge
Required previous knowledge
Kinds and application of clamping means and auxiliary means, reading of the technical drawing.
Explanations of the workshop drawing
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36 h 6: |
36 = Nominal diameter |
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h = Basic shaft |
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6 = Quality |
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A4 x 0.3: |
A = Recess at the diameter |
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4 = width of the recess in mm |
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0.3 = Depth of the recess below final size |
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Sequence of operations |
Remarks |
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1. Putting in soft jaws. |
Use of soft jaws in order to secure true running and to maintain the surface quality of the workpiece. |
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2. Hollowing the soft jaws to Ø 60 mm and a depth of 50 mm. |
Use the required hollowing rings. When clamping, mark the clamping spot on the chuck and use the same place in all following operations. |
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3. Clamping the workpiece. |
Pay attention to the clamping force - with too much force, the workpiece will be deformed. Use the marked clamping places. |
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4. Aligning the workpiece. |
Control the true running with the help of the dial gauge at the external diameter. |
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5. Clamping the tool. |
With multi-tool holders, clamp one drilling tool for through holes and blind holes, each as well as one undercutting tool of 3 mm in width, with the help of shims (with round tool shank - prism). |
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6. Aligning the tool. |
Pay attention to central position, required hollow grinding and length of the clamped part of the tool. |
Clamping and aligning of workpiece and tool
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