 | Driling, Countersinking and Counterboring - Course: Technique for Manual Working of Materials. Instruction Examples for Practical Vocational Training |
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Instruction example 7.4. Drill stand
Practise drilling of small bottom holes and through holes
Material
Figure
- channel-section steel (380 MPa) 80 x 45 x 6 x 8 length: 120 mm (or from training examples 2.3 or 4.2)
- plate made of steel or plastic material
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thickness: approx. |
10 mm |
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width: approx. |
80 mm |
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length: |
120 mm |
- 4 x slotted nail Ø 4 x 10
Working tools
Hand hacksaw, bastard file of 300 mm (flat), surface gauge, centre punch, locksmith’s hammer, drills of 1.1 to 5.0 mm dia., countersink 90°
Measuring and testing tools
Steel rule, vernier caliper
Accessories
Machine vice, diluted soluble oil, 2 x C clamps, spacer
Required previous knowledge
Reading of drawings, scribing, prick-punching, measuring, testing, sawing, filing
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Sequence of operations |
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1. Arrange workplace |
- Check for completeness | |
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2. Take workpiece from training examples 2.3 or 4.2 or pre-finish as to drawing and scribe holes |
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3. Fit plate into channel section, subsequently clamp together |
- Sawing, filing | |
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4. Scribe lateral holes of 4 mm dia. for slotted nails, punch, drill together and deburr |
- n = 2240 r.p.m. | |
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5. Drive in slotted nails | | |
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6. Produce holes as to drawing: | | |
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- drill holes of 1.1 to 2.0 mm dia. as bottom holes to 4 mm depth into the channel section |
- Drill holes specified in drawing by 0.1 mm greater, e.g. for (1) hole of 1.1 mm dia. |
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- Drill holes of 2.1 to 5.0 mm dia. as through holes into channel section and as bottom holes to 2 mm depth into the plate |
- Drill in one pass |
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7. Deburr holes (by means of countersink) | | |
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8. Mark holes by number punch as to drawing | | |
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9. Check the holes |
- Accuracy to size | |
Figure
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