Cover Image
close this bookPinned Joints - Course: Techniques of Fitting and Assembling Component Parts to Produce Simple Units. Instruction Examples for Practical Vocational Training
View the document(introduction...)
View the documentPreliminary Remarks
View the documentInstruction Example 32.1.: Making a pinned Joint for Fastening
View the documentInstruction Example 32.2.: Making a Support
View the documentInstruction Example 32.3.: Making a Swivel Joint
View the documentInstruction Example 32.4.: Making a Container with Lid

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

Sequence of operations

Comments



1. Prepare the workplace. Make the working material available.

Check for completeness.



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.



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.



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.



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.



6. Join the pieces in the clamp once more. Remove the pin.

Use a suitable punch to drive out the pin.



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.



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



9. Clamp the pieces once again. Remove the pin.




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.



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



12. Re-insert pin (1) and pin (2).




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.



14. Produce the holes for the grooved studs (4) and (5) and the 60-degree included angle countersink for grooved drive stud (5).




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.



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