R K Engineering Works is a helical and worm gearbox manufacturer in Jaipur, Rajasthan, working from 29, Udyog Vihar, Road No. 14, VKI Area since 1998. We make helical and worm gearboxes for EOT crane hoists, crane travel drives, wire rope hoists, winches and other slow, heavy drives. Each gearbox is matched to the motor, output speed and duty of the machine. We are ISO 9001, ISO 14001 and ISO 45001 certified.
Last updated: 14 November 2026
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Who is a helical and worm gearbox manufacturer in Jaipur?
R K Engineering Works in VKI Area, Jaipur, makes helical and worm gearboxes in-house. Most of our gearboxes drive cranes, hoists and winches that we also build, so we size them for real lifting duty. We supply new gearboxes and replace worn ones on old cranes across Rajasthan, with a drawing that shows ratio, mounting and shaft details.
What is the difference between a helical and a worm gearbox?
A helical gearbox uses angled teeth on parallel shafts. It is efficient, runs cool and suits drives that run for long hours. A worm gearbox uses a screw-like worm that turns a wheel at a right angle. It gives a high ratio in one compact stage, but it loses more energy as heat. Choose by duty, space and speed.
| Point | Helical gearbox | Worm gearbox |
|---|---|---|
| Shaft layout | Parallel or in-line (bevel-helical for right angle) | Right angle |
| Efficiency | High; little energy lost as heat | Lower; drops as the ratio goes up |
| Ratio in one stage | Moderate; more stages for high ratio | High in a single stage |
| Heat in long runs | Runs cooler | Runs warmer |
| Size for a high ratio | Larger | Compact |
| Noise | Low | Very low |
| Best crane use | Hoist drives and travel drives that run often | Light, slow or occasional drives |
| Typical machines | EOT crane hoist and long travel, wire rope hoists, haulage winches | Small winches, gates, light conveyors, slow positioning drives |
In short: a helical gearbox for regular crane and hoist duty, a worm gearbox where space is tight and the drive runs only now and then.
What should you specify when you order a gearbox?
Give us the motor power and speed, the output speed or ratio you need, the mounting, and how many hours a day the drive runs. With these five facts we can size the gear stages, shafts and bearings and send a drawing for your approval before we make the gearbox.
| Item to share | Example of what to tell us | Why it matters |
|---|---|---|
| Motor power and speed | kW and RPM on the motor plate | Sets the input torque and the gear size |
| Output speed or ratio | Drum RPM or line speed of the crane | Decides the number of stages and the ratio |
| Mounting | Foot, flange or shaft mounted | Sets the housing and fixing holes |
| Shaft position | In-line, parallel or right angle | Decides helical, bevel-helical or worm |
| Duty | Hours per day and starts per hour | Sets the service factor so the gearbox does not overheat |
| Machine | EOT crane hoist, travel drive, winch or hoist | Crane drives follow the duty class of IS 3177 |
| Site | Indoor, outdoor, dust, heat | Decides seals, breather and oil grade |
How to choose a helical or worm gearbox: 6 steps
- Write down the motor power, motor speed and the output speed you need.
- Work out the ratio: motor speed divided by output speed.
- Count the duty: hours per day and starts per hour. Crane drives use the duty class in IS 3177.
- Pick the type: helical for drives that run often, worm for light, slow or occasional drives.
- Choose the mounting and shaft position that fits your existing frame or drum.
- Ask for a drawing that shows ratio, service factor, shaft sizes and oil grade before you approve.
IS 7403 is the Indian code of practice for selecting standard worm and helical gearboxes. Ask any supplier which service factor they used and why.
Which machines use our gearboxes?
- EOT and gantry cranes: hoist, cross travel and long travel drives. Cranes are designed to IS 3177 and IS 807 and load-tested at 125% with the gearbox fitted.
- Electric wire rope hoists: the gearbox between motor and drum. See wire rope hoist vs chain hoist.
- Winches: lifting, haulage and wagon winches. See our industrial winch guide.
- Crane modernisation: replacing a noisy or leaking gearbox on an old crane. See EOT crane modernisation.
When should a crane gearbox be replaced?
Replace or repair a crane gearbox when it knocks or whines under load, leaks oil after seal repair, heats up in normal duty, or shows backlash when motion starts or stops. Broken or pitted teeth found at inspection are a clear sign. A planned check under a crane AMC finds these early.
- Noise or knocking during hoisting or travel
- Oil leaks that return after the seals are changed
- Backlash felt when the motion starts or stops
- The case gets very hot in normal duty
- Broken or pitted teeth seen at inspection
Our crane AMC in Jaipur includes gearbox oil checks, noise checks and brake checks at each visit.
Do you supply gearboxes across Rajasthan?
Yes. From Jaipur we supply and fit gearboxes for plants in Jodhpur, Kota, Udaipur, Bhilwara, Ajmer, Alwar, Bhiwadi, Bikaner and other districts. For Jodhpur stone, steel and handicraft units, see helical and worm gearboxes for Jodhpur cranes.
Why buyers choose R K Engineering Works
- Working since 1998 from VKI Area, Jaipur
- ISO 9001, ISO 14001 and ISO 45001 certified
- Helical and worm gearboxes made in-house and matched to each machine
- Cranes designed to IS 3177 and IS 807 and load-tested at 125%
- One team for the crane, hoist, winch, gearbox and AMC
FAQs
Do you make helical and worm gearboxes in Jaipur?
Yes. R K Engineering Works makes helical and worm gearboxes in its own works at VKI Area, Jaipur. We match each gearbox to the motor, output speed and duty of the crane, hoist or winch it will drive.
Which is better for a crane hoist: helical or worm gearbox?
For a crane hoist or travel drive that runs often, a helical gearbox is usually better. It is more efficient and runs cooler. A worm gearbox suits light, slow or occasional drives where a compact size and a high single-stage ratio matter more.
Can you replace a worn gearbox on an old EOT crane?
Yes. During crane modernisation or AMC we check the old gearbox, note the motor power, speed and mounting, and supply a matched replacement. We then run the crane and check noise, heat and brake action before handover.
Do you supply gearboxes outside Jaipur?
Yes. We supply and fit gearboxes for plants across Rajasthan, including Jodhpur, Kota, Udaipur, Bhilwara, Ajmer, Alwar and Bikaner.
जयपुर में हेलिकल और वर्म गियरबॉक्स कौन बनाता है?
आर के इंजीनियरिंग वर्क्स, वीकेआई एरिया, जयपुर, 1998 से हेलिकल और वर्म गियरबॉक्स बनाता है। हम हर गियरबॉक्स को क्रेन, होइस्ट या विंच की मोटर, स्पीड और ड्यूटी के हिसाब से मिलाते हैं।
क्रेन के लिए हेलिकल गियरबॉक्स लें या वर्म गियरबॉक्स?
जो ड्राइव रोज़ लंबे समय चलती है, जैसे क्रेन होइस्ट और ट्रैवल, उसके लिए हेलिकल गियरबॉक्स ठीक है क्योंकि यह कम गर्म होता है और ज़्यादा कुशल है। धीमी और कम चलने वाली ड्राइव के लिए वर्म गियरबॉक्स ठीक है।
Request an engineering consultation
Send your motor details, output speed, mounting and duty. We will reply with a gearbox drawing. Price on request after the technical review. Call +91 9799108009 or +91 9413341806, email contact@rkengineeringworks.in, or book a site survey.