 | Pinned Joints - Course: Techniques of Fitting and Assembling Component Parts to Produce Simple Units. Instruction Examples for Practical Vocational Training |
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Instruction Example 32.1.: Making a pinned Joint for Fastening
Practise the making of pinned joints for fastening by using different types of pins.
Material
Figure
- 2 pcs. of square stock made of steel (380 MPa)
Thickness: 24 mm
Length: 90 mm
- Sheet metal piece, any metal
Thickness: approx. 5 mm
Width: 24 mm
Length: 48 mm
- Cylindrical grooved pin, Æ 8
× 48, part (1)
- Tapered pin, Æ 8 ×
46, part (2)
- Cylindrical pin, Æ 8m6 ×
48, part (3)
- Grooved drive stud, round head Æ 4 × 10, part (4)
- Grooved drive stud,
countersunk flat head Æ 4 × 10, part (5)
Tools
Drilling machine with accessories, marking gauge, centre punch, locksmith’s hammer, aluminium hammer, drill Æ 4 mm, Æ 7.8 mm, Æ 8 mm, 60-degree and 90-degree included angle countersinks, cylindrical hand reamer Æ 8K7, taper reamer (1:50) Æ 8 mm
Measuring and testing means
Vernier calliper, plug limit gauge Æ 8K7, try square
Auxiliary accessories
Drift Æ 7.8 mm, vice, machine grease, clamp, cutting fluid, support
Necessary previous knowledge
Manual material working - marking, punching, drilling, boring, countersinking, reaming, testing
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Sequence of operations |
Comments |
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1. Prepare the workplace. Make the working material available. |
Check for completeness. |
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2. Join the square stock by a clamp. Mark and punch the centres for drilling. |
Make sure that the reference surface is even and accurate in angle and without offset. |
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3. Produce the holes for pins (1), (2) and (3). Countersink at both ends. |
Calculate the hole diameter from the type of pin used and the nominal diameter. |
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4. Apply some grease to pin (1) and insert it into its hole. |
Drive in the grooved cylinder pin by two or three short blows with a hammer. |
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5. Remove the clamps. Check that the two pieces of square stock are held together tightly by the pin. |
Try to twist the joint. Ask your instructor to see and assess the joint. |
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6. Join the pieces in the clamp once more. Remove the pin. |
Use a suitable punch to drive out the pin. |
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7. Ream the hole for pin (2). Slightly grease the pin (2) and insert it into its hole. |
Try the fit of the taper pin before you drive it out. |
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8. Remove the clamp. Check that the two pieces of square stock are firmly held together by the pin. Check the pin for correct fit |
Try to twist the joint. Ask your instructor to see and assess the joint |
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9. Clamp the pieces once again. Remove the pin. | |
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10. Ream the hole for pin (3). Slightly grease pin (3) and insert it into its hole. |
Be careful when driving in the cylindrical pin. |
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11. Remove the clamp. Check that the two pieces of square stock are firmly held together by the pin. |
Try to twist the joint. Ask your instructor to see and assess the joint |
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12. Re-insert pin (1) and pin (2). | |
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13. Clamp the piece of sheet metal 24 × 48 together with the pieces of square stock. Mark and punch the holes for the grooved drive studs (4) and (5). |
Apply the clamp to the middle of the sheet metal piece. |
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14. Produce the holes for the grooved studs (4) and (5) and the 60-degree included angle countersink for grooved drive stud (5). | |
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15. Insert the grooved drive studs (4) and (5) into their holes and drive them in by slight blows with an aluminium hammer. |
Do not damage the heads of the drive studs. |
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16. Remove the clamp. Check that the parts are firmly held together by the grooved drive studs. Check the drive studs for correct fit |
Ask your instructor to see and assess the joint |
Figure
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