 | Keyed Joints - Course: Techniques of Fitting and Assembling Component Parts to Produce Simple Units. Instruction Examples for Practical Vocational Training |
 |
|
Instruction Example 35.1. Tapered Driving Key Joints
Practising the making of a keyed joint using a drive-fitted key.
Material
Figure
Component parts of steel (420 MPa) premanufactured according to the working drawing:
|
- Shaft |
(1) | |
| |
Diameter |
50 h 6 |
| |
Length: |
150 mm approx. |
|
- Hub |
(2) | |
| |
Diameter: |
70 mm |
| |
Length: |
65 mm |
|
- Drive-fitted key |
(3) | |
| |
Height: |
8.7 mm |
| |
Width: |
14 h 9 |
| |
Length: |
70 mm |
Tools
Finishing file 200 mm (half-round), triangular scraper, locksmith’s hammer, hand hacksaw.
Measuring and testing means
Vernier caliper, plug limit gauge Ø 50 H 7, external limit gauge Ø 50 h 6, dial gauge with tripod and holding device for shaft.
Auxiliary accessories
Vice with soft-metal protective jaws, machine grease, cotter driver.
Necessary previous knowledge
Measuring, testing, fundamentals of fitting.
|
Sequence of operations |
Comments |
| | |
|
1. Preparing the workplace. |
Checking for completeness. |
| | |
|
2. Checking the individual parts for accuracy of size and burr; deburring, if necessary. |
- Shaft (1) |
| | |
|
3. Putting the key in the keyways of the assembled parts by way of trial. |
Finding out the bearing contact pattern on the back surface, reworking the surfaces to fit. |
| |
|
|
4. Sawing the tapered driving key to final length (approximately 63 mm). |
Tapered driving key must not project from the side of the hub. |
| |
|
|
5. Greasing the shaft and the hub slightly and reassembling them. |
|
| | |
|
6. Putting in a slightly greased tapered driving key and fixing it with the help of hammer and cotter driver. |
Clamp the component parts firmly in the vice! |
| | |
|
7. Testing the joint. |
- Firm fit of the hub. |
| | |
|
8. Undoing the joint, dismantling of hub and shaft. |
Driving out the tapered driving key in opposite direction by cotter driver. |
Figure
|
|