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Proper coupling selection: what you’re probably missing
This document outlines a webinar focused on proper coupling selection as an integral part of system design, emphasizing the importance of considering torque capacities, misalignment capabilities, and environmental factors. It discusses various types of couplings, specifically bellows couplings by Servometer, including their construction, specifications, and applications. Additionally, the document includes insights into custom coupling solutions, key performance metrics, and guidelines for optimal coupling selection.
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Proper coupling selection: what you’re probably missing
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- 2. #DWwebinar q This webinarwill be available afterwards at www.designworldonline.com & email q Q&A at the end of the presentation q Hashtag for this webinar: #DWwebinar Before We Start
- 3. #DWwebinar Meet your Speakers MODERATORFEATURED SPEAKER Randy Kingsbury Vice President of Sales and Marketing Helical Products Company Mike Santora Associate Editor Design World FEATURED SPEAKER Robert Collins Technical Sales Engineer Servometer
- 4. Proper Coupling Selec/on #1 Step Consider thecoupling an integral part of your system during the design phase. Not an afterthought when assembling. __________________________
- 5. Proper Coupling Selec/on #1 Step Consider thecoupling an integral part of your system during the design phase. Not an afterthought when assembling. __________________________ There are many types of couplings offering different torque capacities, varying misalignment capabilities, overall dimensions (diameter & length) and materials.
- 6. Proper Coupling Selec/on #1 Step Consider thecoupling an integral part of your system during the design phase. Not an afterthought when assembling. __________________________ There are many types of couplings offering different torque capacities, varying misalignment capabilities, overall dimensions (diameter & length) and materials. There is no governing body for couplings.
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- 8. Proper Coupling Selec/on Tolerances Stack Up Example: Resonance Oscillator Motor, Mount, Base, Bearing Block, Bearings, Sha6 Motor 0.002 Motor Mount +- 0.005 Base 000 Bearing Block +- 0.005 Bearings 0.0005 Sha6 0.0005 ___________________________ Maximum total 0.013
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- 14. Proper Coupling Selec/on Other Considera/ons o Axial Mo/on Thermal Expansion Thrust loading o Iner/al loading Accelera/on Decelera/on o Environmental Temperature Chemical Medical o Speed/RPM
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- 22. Stock & CustomEngineered Bellows Couplings
- 23. 1. Servometer BellowsCoupling Construction 2. Standard Bellows Couplings Available 3. Custom Bellows Couplings Available 4. Examples of Applications 5. Pitfalls of Proper Coupling Selection 6. Geometry Requirements 7. Torque Requirements 8. Flexible Movement Considerations 9. Mutual Exclusivity for Bellows Couplings 10. Operational Environments 11. Guidelines for Specifying a Custom Design
- 24. Bellows couplings arean assembly of two end pieces and a thin walled metal bellows. The thin walled Metal Bellows are made by electroplating Nickel metal onto a precision-machined mandrel and then chemically removing the mandrel so that all that remains is the electroformed bellows. Servometer produces parts using our signature Nickel-Cobalt Alloy, FlexNickel® It can be used with other surface finishes including copper, gold, and silver or a combination depending upon media compatibility and conductivity.
- 25. Diameters from¼” to 2.4” Lengths from 0.48” to 2.4” Torque range from 2 in-oz up to 4,000 in-oz Temperature Range from -58° F up to 260° F Zero Backlash Low Windup/High Torsional Stiffness 100,000,000 Cycle Life Rating within rating limits (Compression, Bending, and Offset are MUTUALLY EXCLUSIVE)
- 26. } Form, Fitand Function Optimized for Your Application ◦ Bore sizes ◦ Unique ends or flanges ◦ Unique Performance Values ◦ Increased Torque ◦ Operating Temp up to 300°F
- 28. } It’s allabout geometry. } Torque requirements will match bore size. } My last bellows coupling broke so I need either higher torque or a different design. ◦ Cycle life -100,000,000 cycles determined by: – 1 rotation = 2 cycles – Amount of Compression, Offset, Bending – NO EXCURSIONS
- 29. } Operational environmentis not important. } Speed of rotation is not important. } I don’t have enough time for a custom design.
- 30. } Design EnvelopeRestricts Selection ◦ Outside Diameter – Custom solutions with thicker walls might meet higher torque requirements with smaller diameters. ◦ Overall Length – Bellows Couplings are “Hollow” – Larger diameter may be necessary. – Set-Screw Bellows Couplings are shorter than clamping style.
- 31. } Torque ofMotor is NOT the Maximum Torque. ◦ Gearboxes provide a multiplier to the available torque at the input shaft = to the speed ratio. ◦ Starting Torque of Motor can be 3X – 5X of standard operating Torque. ◦ When a Bellows Coupling is used in compression only 75% of allowable coupling Torque rating should be considered Maximum Allowable ◦ Pulleys and Moments of Inertia must be considered to calculate maximum instantaneous torque.
- 32. } Compression, Offset,Bending are Mutually Exclusive. ◦ % of above properties with respect to maximum allowed when added must not exceed 100% ◦ Bellows Couplings are quite flexible but should not be abused.
- 33. } More Compression/Offset/Bending Required ◦ Coupling can be de-rated (less than 100,000,000 cycles) to achieve a more flexibility for reduced life. } Compression on Bellows Coupling ◦ Use 75% of Maximum Torque Allowed.
- 34. Product Specs Parallel Offset Bending Compression Allowable Torque Comments FC-1@ 1X 108 Cycles 0.076” 31° 0.107” 2 in-oz Allowable Example 1 0 (0%) 31° (100%) 0 (0%) 2 in-oz All Angular Full Torque Example 2 0 (0%) 15.5 (50%) 0.05 (50%) 1.5 in-oz 50/50 Mix 75% of rated Torque FC-1 @ 1 X 104 cycles 0.144” 58.9° .203” 2 in-oz Increased Movement for 10,000 cycles
- 35. } Temperature ◦ Maxoperating temp for Servometer bellows couplings is 260°F ◦ Min Operating Temp for Servometer Bellows has not yet been determined. } Corrosion Resistance ◦ Servometer Bellows Couplings are an assembly – Material: Servometer FlexNickel – 303 Stainless Steel Hubs (Aluminum also available) ◦ Servometer Bellows Couplings typically suitable for high PH environments.
- 36. } Collect ALLpertinent information ◦ Temperature of Operation ◦ Corrosion Potentials (Materials of Construction) ◦ Type of Movement (How much of each?) – Offset (even small amounts can count) – Compression – Bending ◦ Max Torque ◦ Speed of Rotation
- 37. } Standard orCustom } Know your Geometry } Torque Requirements } Flexibility Requirements } Operational Environment } Guidelines for Custom Parts
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- 39. #DWwebinar Questions? MODERATOR FEATURED SPEAKER RandyKingsbury Vice President of Sales and Marketing Helical Products Company RKingsbury@hel-cal.com Mike Santora Associate Editor Design World msantora@wtwhmedia.com FEATURED SPEAKER Robert Collins Technical Sales Engineer Servometer RobertC@servometer.com
- 40. #DWwebinar q This webinarwill be available at designworldonline.com & email q Tweet with hashtag #DWwebinar q Connect with Design World q Discuss this on EngineeringExchange.com Don’t Forget!
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