If your team is searching for compact, high torque and reliable gearing solutions, we can help!
For more than 60 years, we’ve helped engineers solve tough gearing problems. Access our technical papers, case studies and data sheets below. If you have a specific inquiry, feel free to contact our engineers directly. (320) 762-7133.
CASE STUDIES: Helicon vs. Worm
(DOWNLOAD ALL THREE)
CASE STUDY.
DESIGN FOCUS: MAXIMIZE TORQUE
Each gear type offers performance trade-offs depending on its unique design characteristics. Our goal is to quickly help you evaluate which type of gear technology is best-suited to fit the specific performance requirements of your design project.
What’s in the Case Study?
This case study compares the specific performance characteristics of Helicon and Worm gear sets for design applications that require maximum torque capacity.
CASE STUDY.
DESIGN FOCUS: MINIMIZE SPACE CLAIM
Each gear type offers performance trade-offs depending on its unique design characteristics. As an Engineer, it is your job to evaluate which type of gear technology is best-suited to fit the specific performance requirements of your design project.
What’s in the Case Study?
This case study compares the specific performance characteristics of Helicon and Worm gear sets for design applications that require minimal space claim.
CASE STUDY.
DESIGN FOCUS: MAXIMIZE EFFICIENCY
Each gear type offers performance trade-offs depending on its unique design characteristics. As an Engineer, it is your job to evaluate which type of gear technology is best-suited to fit the specific performance requirements of your design project.
What’s in the Case Study?
This case study compares the specific performance characteristics of Helicon and Worm gear sets for design applications that require maximum efficiency.
WHITE PAPER: High Torque Skew Axis Technical Primer
What’s in the White Paper?
This guide provides a technical framework that is the foundation of Spiroid’s competitive advantage in the high torque right angle gear marketplace. It covers topics such as:
- Spiroid Gearset Characteristics
- Basic Theory
- Tooth and Blank Proportions
- Gearset Sizing
- Application Engineering
APPLICATION DATA SHEET
Would you like to learn how Spiroid Gears can be used in your application? Fill out the contact form and we’ll respond immediately. You can also call us at 320-762-7133. We’ll get you connected directly to the right person to answer any specific question you might have.
If you have specific application requirements, please fill out and send us the Application Data Sheet. We’ll be able to serve your inquiry more efficiently. Thank you.
INERTIA BALANCE IN A GEARBOX
“When such an inertia relationship does not exist between gear and the pinion, at the point of irreversibility (self-locking), intermittent separation of the pinion and gear teeth occur and result in jerky operation because, alternatively, the pinion advances ahead of the gear through the gear clearance and then the descending load causes the gear to catch up with the pinion and engage with impact.”
From ‘Worm-drive Jitters can be Avoided’ by S.J. Mikina
“Stick slip” occurs when a self-locking gear set achieves overhauling mode. That is to say it occurs when the gear, for whatever reason, begins to drive the pinion.
To avoid the stick-slip phenomenon when designing a gearbox, it is important to design it in such a way that the cumulative mass moment of inertia of the input (pinion) side is always greater than the cumulative mass moment of inertia of the output (gear) side.
Achieving non-stick-slip gearbox design
The kinetic energy (KE) of a non-rotating particle of mass m travelling at speed v is represented by KE = ½mv2
Per the law of conservation of energy:
½m1v1 2 = ½m2v2 2(1)
In rotary motion, mass (m) is replaced by mass inertia (I),while velocity (v) is replaced by angular velocity (ω).
Substituting mass inertia (I) and angular velocity (ω) into equation (1) ½I1ω12 = ½I2ω22(2)
For reduction ratio (R), ½I1(Rω2) 2 = ½I2(ω2)2 I1R2 = I2
Taking efficiency into account, formula ≥ I2(3)
Where I1 = cumulative moment of inertia of the input
I2 = cumulative moment of inertia of the output
The inertias I1 and I2 are calculated for the entire shaft assembly. For example, the output side inertia I2 must include the gear, shaft, bearing races, etc. Essentially, it must include everything rotating at that output speed. Further, while calculating the cumulative output side moment of inertia, it is also important to consider the maximum output torque. See below:
I2 = Igear + Ishaft + Ibearing races + Ioutput torque + etc.
THEORETICAL PERFORMANCE RATINGS
This ratings data represents theoretical performance values for a given size and ratio range – at various speeds. These values are not intended to represent actual gear sets that Spiroid maintains in stock. While Spiroid does maintain an inventory of cutting tools, our customer’s specific applications will determine whether ‘Stock’ or ‘Custom’ cutting tools are appropriate. Please contact us directly for further information (320) 762-7133.
