Custom Spring Design
Spring Design 101
Ritchy Froehlich,
General Manager
India Springs & Form Co., Inc.
What information is needed to properly design/order a spring?
1) What parameters do I Have?
- What does my spring fit into?
- What does my spring fit over?
- What is the atmosphere? (Moisture, Saltwater, Heat etc.)
- How is the spring being used/installed?
- Has there ever been a problem before?
What information is needed to properly design/order a spring?
2) What are the spring’s physical requirements?
- What are the relaxed/installed lengths?
- How much travel is involved?
- What length are you traveling to? (Length/Deflection)
- What is the max solid/travel height?
- What force is needed at a specified length?
- What type of material is needed?
- What are the end types needed?
- Tight Tolerances Needed?
- Type of winding?
Compression Springs
- Type of ends?
Compression Springs
2) What are my Physical Characteristics?
- Size/Type of Material?
- Outside Diameter?
- Inside Diameter?
- Free Length?
-Total Coils?
- Solid Height?
- Rate per Inch?
- Load @ Length?
Compression Springs
Extension Springs
2)What are my Physical Characteristics?
- Size/Type of Material?
- Outside Diameter?
- Inside Diameter?
- Free Length Body/Inside Hooks?
- Total Coils?
- Initial Tension?
- Rate per Inch?
- Load @ Length?
- Max Deflection?
- Gap Lengths of hooks?
Straight Pull?
Extension Springs
Extension Springs
Extension Springs
Extension Springs
Torsion Springs
2) What are my Physical Characteristics?
- Size/Type of Material?
- Outside Diameter?
- Inside Diameter?
- Body Length?
- Total Coils?
- Angle at free position?
- Degrees of deflection?
- Rate Inch/lbs. Per Degree?
- Max degrees of Deflection?
- Closewound or Pitched?
Torsion Springs
1)Type of Ends?
Conclusion
1) Always offer as much information as possible!
2) Remember, price is not always everything!
3) Remember, lead times!
Spring Specification Sheet
