Driling, Countersinking and Counterboring - Course: Technique for Manual Working of Materials. Instruction Examples for Practical Vocational Training: Instruction example 7.6. Rotary head for threaded spindle

Driling, Countersinking and Counterboring - Course: Technique for Manual Working of Materials. Instruction Examples for Practical Vocational Training

		(introduction...)
		Introduction
		Instruction example 7.1. Drilling, countersinking and counterboring training workpiece
		Instruction example 7.2. Clamping jaws for round material
		Instruction example 7.3. Rivet set and rivet header
		Instruction example 7.4. Drill stand
		Instruction example 7.5. Bottle-opener
		Instruction example 7.6. Rotary head for threaded spindle

Instruction example 7.6. Rotary head for threaded spindle

[...]

Sequence of operations	Comments

1. Arrange workplace Prepare working material	- Check for completeness

2. Check initial dimensions as to drawing

3. Scribe hole in head by centre square and punch, drill bottom hole of 10.5 mm dia. to 10 mm depth	- Stage (1) - n = 900 r.p.m.

4. Scribe and punch hole of 2.8 mm dia. as to drawing, clamp head in machine vice and spot-drill	- Stage (2) - Let drill point penetrate only

5. Loosen machine vice, turn head together with hole 1 mm outwards, spot-drill again until drill point does not walk off centre any more	- Apply only slight pressure onto drill

6. Repeat operation No. 5 until hole centre is 5 mm off centre

7. Insert threaded bolt’s thread-free part into head, drill hole through head and threaded bolt with threaded bolt held in position

8. Disassemble the parts, deburr the hole

9. Check the hole

Finishing: Ream hole in the head by means of reamer Ø 3 K 7, file groove in the threaded bolt in height of hole mark as to drawing stage (3); assemble parts and secure by means of straight pin Ø 3 m 6, check for rotatory movement of the head on the bolt.

Figure