Helwig offers replacement spring assemblies for virtually every type of constant force brush holder, including turbine ring magazines. Our spring assemblies are designed to meet or exceed the performance of the original part. We also replace springs on existing back plates. Over 40 popular style are carried in stock.
- Engineered to give optimal performance for your equipment
- Designed improve brush life and lower maintenance costs
- Helwig Carbon carries over 35 common styles in stock
- Custom made springs available in days
Exclusive Built-In Wear Indicator
An optional wear device is available with selected springs to easily detect when carbon brush should be replaced.
Spring Repair
Did you know that we can replace the springs on your existing clips? Just send in the old clips and we can put on new rollers/springs. Make sure you include an old brush or part number. The brush size, style, and RPM determine the spring force.
Measuring Spring Force
Measure spring force accurately with Helwig Carbon’s high performance, hand held, digital scale. It includes a large easy to read LCD display and attachments for both constant force and torsion type springs. Watch our Measuring Spring Force video below.
RECOMMENDED RANGE OF SPRING PRESSURES
Having the proper spring pressure is as important as the grade of brush. See below for a chart showing the proper spring pressure for the different types of applications.
| Brush Type | Pounds Per Square Inch | Grams Per Square Centimeter |
|---|---|---|
| Industrial D.C. Applications | 4.0-6.0 | 280-420 |
| High Speed Turbine Rings; Soft Graphite Grades | 2.5-3.5 | 170-240 |
| Metal Graphite Brushes | 4.5-5.5 | 310-390 |
| FHP Brushes | 4.0-7.0 | 280-490 |
| Traction Brushes | 5.0-8.0 | 350-560 |
Top and bottom bevels contribute to loss of spring pressure.
| Angle in Degrees | Loss of Force |
|---|---|
| 5 | 0.40% |
| 10 | 1.50% |
| 20 | 6.00% |
| 25 | 9.40% |
| 30 | 13.4% |
| 35 | 18.10% |
| 40 | 23.40% |