OSHA Accident Investigation · Summary #999391
METRO MACHINE & ENGINEERING CORP.
EDEN PRAIRIE, MN·
Event description
Employee injured when grinding wheel shatters
Investigation abstract
Employee #1 was preparing to true up the face of a grinding wheel that was mount ed on a Themacs tool post grinder. As the guard on the grinder was turned on, th e wheel shattered and struck him in the right upper chest. He sustained cuts and lacerations and was hospitalized. Subsequent investigation revealed that the pu lleys on the motor and spindle shafts were reversed, causing the wheel to travel more than four times the rated wheel speed of 3,600 rpms. The no-load motor spe ed is 7,500 rpm; therefore, the estimated grinding wheel speed with a pulley rev ersal of 2 to 1 was up to 15,000 rpms.
Victim
-
#1 Hospitalized Age 26 M
- Nature of injury
- 7
- Part of body
- 5
- Event type
- 1
- Source
- 26
- Occupation code
- 637
- Human factor
- 9
- Environmental factor
- 5
- Task assigned
- 1
Codes shown verbatim from OSHA's accident-investigation database. A human-readable decoder is coming in a future release once the accident_lookup2 dictionary is loaded.