Cylindrical Turning and Face Turning - Course: Techniques for Machining of Material. Instruction Examples for Practical Vocational Training: Instruction example 2.4.: Connection piece

Cylindrical Turning and Face Turning - Course: Techniques for Machining of Material. Instruction Examples for Practical Vocational Training

		(introduction...)
		Preface
		Instruction example 2.1.: Pressure disk
		Instruction example 2.2.: Flange
		Instruction example 2.3.: Bearing shaft
		Instruction example 2.4.: Connection piece

Instruction example 2.4.: Connection piece

This example serves to practise turning of hollow cylindrical parts held in a chuck and without counter-support.

Figure

Material

St 35 b - 2 (St = steel, 35 = tensile strength 350 MPa, b = deoxidizing degree: dead, 2 = grade 2)

Dimensions

R 70 × 10 × 605 (R = seamless precision steel tube. 70 = outside diameter, 10 = wall thickness, 605 = length)

Cutting and operating tools

Right-bent roughing tool, open-end wrench and box wrench, key

Measuring and testing tools

Vernier caliper, dial gauge, depth gauge, steel tape rule, protractor.

Auxiliaries

Supporting plates, length blocks, steady rest (stationary), lubricant

Required previous knowledge

Reading of drawings, types and application of clamping tools, measuring and testing

Sequence of operations	Remarks
1. Measuring of blank	Measure outside diameter and length.
2. Clamping of workpiece	Type of clamping: "chucking" in stepped chuck jaws which can be turned out. Attach and align steady rest (stationary). Consider turning length 105 mm. Check for concentric running and align. Lubricate contact points.
3. Clamping of tool	Pay attention to 45° side-cutting edge angle, align with reference to longitudinal axis of workpiece.
4. Facing - right-hand face	Ensure clean cutting. Pay attention to surface pattern.
5. Turning of dia. 60	Set end stop. Insert 100 mm length block. Take first cut on transition between end face and circumferential surface by right-hand side-cutting edge point, remove length block and finish turning. Pay attention to transitionless chamfer 45º.
6. Chamfering of dia. 60	Take first cut on ø 60 by side-cutting edge and set to the dimension required.
7. Re-chucking	Re-chuck workpiece by 180° of its longitudinal axis and align. Change chuck jaws (new chucking diameter 60 mm). Adjust steady rest jaws. Check for concentric running and align. Lubricate contact points.
8. Turning of total length 600 mm	Set end stop. Face. Pay attention to surface pattern.
9. Chamfering dia. 70	Take first cut by side-cutting edge. Set feed of top slide until required dimension is reached.
10. Unloading and final inspection	Dimensional inspection and inspection of surface finish. The 50 dia. bore is to be deburred during or after the machining process by suitable means (turning tool, scraper).

Figure