Whirling Of Shaft Apparatus
Product Code : EL-TOML-11022
Quick answer: The whirling of shaft apparatus demonstrates the critical or whirling speed of a rotating shaft, when it bows out violently at its natural frequency. Students test 4.75, 6.35 and 7.9 mm shafts with both ends fixed or one end free, raising speed gradually on a 1/8 HP, 1500 RPM motor. Lab Exports manufactures it in Delhi for engineering colleges, polytechnics and TVET institutes.
Specifications
| Component | Specification |
|---|---|
| Test shafts | 4.75 mm, 6.35 mm and 7.9 mm diameter, 2 of each |
| End conditions | Both ends fixed; one end fixed and one end free |
| Drive motor | 1/8 HP, 1500 RPM, with auto-transformer speed control |
| Rotor | Suitable rotor for each test shaft |
| Base | Sturdy base carrying the whole unit |
| Documentation | Technical manual |
| Services | 230 V, 15 A AC supply |
| Floor space | 2 m x 1 m at working height |
How the whirling of shaft experiment is done
Every shaft has a natural frequency of transverse vibration. When the running speed matches it, small out-of-balance forces make the shaft bow into a large whirl; this is the critical or whirling speed. Designers keep machine shafts well away from it, or pass through it quickly, to avoid bearing damage and failure.
For a uniform shaft the whirling speed rises with bending stiffness, which depends on the fourth power of diameter, and falls with length and mass. The end conditions change the effective stiffness, so a shaft with both ends fixed whirls at a higher speed than one with an end free. Students compare the observed speeds with values from transverse vibration theory, and see that the shaft runs true again once it is past the critical speed.
- Fit a test shaft in the bearing holders with the chosen end condition.
- Start the motor and raise the speed slowly with the speed control.
- Note when the shaft starts to whirl visibly and record the speed.
- Increase the speed further to see the shaft settle back to true running.
- Repeat with the other diameters and end conditions and compare with calculated values.
Key features
- Test shafts of three diameters, 4.75, 6.35 and 7.9 mm, two of each
- Bearing holders for both-ends-fixed or one-end-free conditions
- 1/8 HP, 1500 RPM motor with smooth speed control through the critical speed
- Suitable rotor for each test shaft
- Shows the shaft returning to true running after the whirling speed
- Whole unit mounted on a sturdy base
Documentation and supply
Installation instructions and a manual are supplied with the apparatus. Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the whirling of shaft apparatus at its works in Laxmi Nagar, Delhi, and supplies it to engineering colleges, polytechnics and TVET institutes in India and 60+ countries, handling the export documents for each shipment. More about the company is on the About Lab Exports page.
Related Theory of Machine Lab products
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- Cam Analysis Apparatus (EL-TOML-11023)
- Motorised Gyroscope Apparatus (EL-TOML-11020)
- Vibration Lab Complete 11 Experiment (EL-TOML-11024)
- Static Dynamic Balancing Apparatus (EL-TOML-11019)
- Generation of Involute Gear Tooth Profile (EL-TOML-11025)
The full range is in the Theory of Machine Lab section of the Engineering Lab range.
Frequently asked questions
Which shaft sizes are supplied with the whirling of shaft apparatus?
Test shafts of 4.75 mm, 6.35 mm and 7.9 mm diameter, two of each size.
What end conditions can be tested?
Both ends fixed, and one end fixed with the other end free.
What is the price of the whirling of shaft apparatus?
Prices are not published on the website. Add the whirling of shaft apparatus to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code EL-TOML-11022 and the quantity, to receive a quotation.
Does Lab Exports manufacture the whirling of shaft apparatus?
Yes. Lab Exports manufactures the whirling of shaft apparatus at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code EL-TOML-11022.
Request a quote
Email [email protected] with the house code EL-TOML-11022 and the quantity, or add the whirling of shaft apparatus to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
