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Diamond Machine Tools, Inc. |
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| 6712 Crawford Ave. Lincolnwood, IL 60712-3587 |
| How to use a Variable Speed
Control to optimize a precision grinding application |
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Aluminum oxide, silicon carbide, diamond, CBN BORAZON® , etc., and the changes in speed are necessary. Grit size, hardness, porosity, and bond all add to make a differ-ence. but the basics remain the same. Keep records of the change in action in order to compare results. The Variable Speed Control has a readout in RPM and Hertz. Some of the controls also read out in Amps and Watts. Track your findings and results when precision grinding your various materials. As the wheels wear and get smaller in diameter it will be necessary to adjust to a higher speed. Transversely, when using a new full size (Aluminum Oxide) conventional abra-sive wheel it may be necessary to reduce the base SFPM (Surface Feet Per Minute) until the wheel acts too soft. Then slowly increase RPM’s as required to optimize the grinding ratio. Variable Speed Control capability is also beneficial when form grinding, slot grinding, face and side wheel grinding. You will also benefit when trying to achieve extreme flatness and low surface finishes by having this additional control over the grinding rate. Now, more than ever before, with the advent of harder, tougher materials, the demand for greater flexibility in precision grinding requires the grinding wheel to grind over a tremendously greater variety of applications. Another interesting factor also happens when using different bonded CBN BORAZON® grinding wheels. Some require low SFPM of 1,000 to 2,000 SFPM and yet even others require much higher SFPM in the area of 7,000 to 15,000. You can now understand the reasons for this variable speed capability. NOTE: When using conventional abrasive wheels check their balance more frequently. In optimizing production, slight changes will adversely effect SFPM and grind. Even coolants need to be checked out for lubricity, PH, cleanliness, proper volume and filtration. Coolant nozzles and their placement is critical as well as breaking the air flow around the wheel.
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Simply said: The slower the wheel rotates
the softer the wheel acts. The lower the
SFPM (Surface Feet Per Minute), the lower
the friction. And the reverse is also true.
The faster the wheel rotates the harder it
acts. The higher the surface feet per minute
the higher the friction. The higher the fric-tion
the higher the heat. Now couple this
with the kind of grinding wheels you use:
Get the answers to your