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Test 1 Memo for semester 1
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MEMO FOR S1 2021 ASSIGNMENT 1 FOR T1_MARK - MED21AThe client requires a single step-up spur gearbox to transmit a 10 kW power from a shaft rotating at
1000 rpm, while the output speed must be 1700 rpm. The material for gear and pinion is 817M40 and
655M13, respectively. Use table 6.10 on page 128 to select the suitable gear and pinion.
1.1 Briefly state the problem. 3
Answer to 1.1 The aim is to select standard gears for single step-up spur gearbox based
on Lewis's formula in order to achieve ouput speed of 1700 rpm.
Refer to the lecture 1 notes on page 11
1.2 State the design specification considering the following design 8
factors:
1. Functionality
2. Stress
Answer to 1.2 Design Factor Objective Criteia Test Condition
Functionality Transmit Transmit 10kW with Test transmittion
Torque transmission ratio of using dymometer.
within 1700/1000 =1.7.
speed ratio
as stated in
Table 6.2
page 111.
Stress Verify the Selection of spur gears Use Lewis
bending with face width within 35 Formula to
stress at the mm as per Table 6.10 determine face
root of the page 128. width and
teeth due to compare with the
transmitted face width on
load. Table 6.10 page
128.
Example on page 339
1.3 State formula and standards relevant to the single step-up spur 4
gearbox design.
Answer to 1.3 1.Lewis’s formula.
2.British Standards Institution. (1967). BS436: Part 1:1967 Specification
for spur and helical gears. Part 1 Basic rack form, pitches and accuracy
(diametral pitch series).
3.British Standards Institution. (1970).BS436: Part 2:1970 Specification
for spur and helical gears. Part 2 Basic rack form, modules and accuracy (1
to 50 metric module).
4.British Standards Institution. (1976). BS2519: Part 1, 1976. Glossary for
gears. Geometrical definitions.
Refer to the standards on page 133
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