A shop mechanic is selecting a mounted abrasive wheel to install on a high-speed pneumatic die grinder with a maximum free-running speed of . To prevent catastrophic wheel disintegration and ensure safe shop operation, which requirement must the replacement wheel meet regarding its rotational speed rating?
- AIt may have a maximum rated speed lower than the tool's rating as long as light grinding pressure is maintained during operation.
- BIt can be rated below the grinder's free speed if a full face shield and protective guards are used by the operator.
- It must have a maximum rated speed that is equal to or greater than the maximum no-load spindle speed of the grinder.Cevap
- DIt is acceptable to use a lower-rated wheel as long as pneumatic line pressure is reduced to slow the tool down.
Cevap
The abrasive wheel must have a maximum rated speed that is equal to or greater than the maximum no-load spindle speed of the grinder.
Grinding wheels are engineered with specific speed limits based on their bonding composition and diameter. The maximum safe operating speed (RPM) marked on the abrasive wheel must always equal or exceed the maximum possible spindle speed of the power grinder. This prevents centrifugal force from tearing the wheel apart during free-spinning and active grinding.
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Anahtar Kavram
Power grinder spindle speed versus abrasive wheel maximum rated RPM matching
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