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close this bookSetting-up and Operating of Regular Engine Lathes - Course: Techniques for Machining of Material. Instruction Examples for Practical Vocational Training
View the document(introduction...)
View the documentPreface
View the documentInstruction example 1.1.: Handling the operation elements
View the documentInstruction example 1.2.: Selection of the working means
View the documentInstruction example 1.3.: Clamping and aligning of workpiece and tool
View the documentInstruction example 1.4.: Care and maintenance of the lathe

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

Tools

Auxiliary means

Internal corner tool
Boring tool
Undercut ting-tool
Clamping wrench
Open-end wrench

Gripping jaws that can be bored
Shims
Hollowing rings

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

36 h 6:

36 = Nominal diameter


h = Basic shaft


6 = Quality

A4 x 0.3:

A = Recess at the diameter


4 = width of the recess in mm


0.3 = Depth of the recess below final size

Sequence of operations

Remarks



1. Putting in soft jaws.

Use of soft jaws in order to secure true running and to maintain the surface quality of the workpiece.



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.



3. Clamping the workpiece.

Pay attention to the clamping force - with too much force, the workpiece will be deformed. Use the marked clamping places.



4. Aligning the workpiece.

Control the true running with the help of the dial gauge at the external diameter.



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).



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