Machine Shop Safety: Mill

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1. Slide 1

   Introduction to Mill Safety

   • This material was produced under Susan Harwood grant number SH-31214-SH7 Occupational Safety and Health Administration, U.S. Department of Labor. The contents in this presentation do not necessarily reflect the views or policies of the U.S. Department of Labor, nor does the mention of trade names, commercial products, or organizations imply endorsement by the U.S. Government.
2. Slide 2

   Introduction: What’s a mill?

   • Mills are highly adaptable, and can be used to cut material in a number of ways. The types of cuts they can perform include:
   • Flat surfaces
   • Grooves
   • Shoulders
   • Inclined Surfaces
   • Slots
   • The components of a Mill
3. Slide 3

   Introduction: Early mills

   • Mills are wheel-cutting machines
   • Early milling machines were used by clockmakers as far back as the 1700s
   • Eli Whitney is credited with designing the first modern, dependable milling machine
   • An early version of mill
4. Slide 4

   Introduction: Early mills continued

   • In 1936, Rudolph Bannow invented the Bridgeport milling machine
   • Bridgeport mills are still commonly used today
   • The success of the Bridgeport Mill has lead to numerous variations
   • The patent drawing of the Bridgeport milling machine
5. Slide 5

   Safety: Who is OSHA?

   • With the Occupational Safety and Health Act of 1970, Congress created the Occupational Safety a nd Health Administration (OSHA) t
   • assure safe and healthful working conditions for working men and women by setting and enforcing standards and by providing training, outreach, education and assistance.
   • OSHA is part of the United States Department of Labor. The administrator for OSHA is the Assistant Secretary of Labor for Occupational Safety and Health. OSHA's administrator answers to the Secretary of Labor, who is a member of the cabinet of the President of the United States.
6. Slide 6

   Safety: Know your rights

   • Under federal law, you are entitled to a safe workplace.
   • employer must provide a
   • Your
   • workplace free of known health and safety hazards.
   • you have concerns, you have
   • If
   • the right to speak up about them without fear of retaliation. You also have the right to:
   • Be trained in a language you understand
   • Work on machines that are safe
   • Be provided required safety gear, such as gloves or a harness and lifeline for falls
   • Be protected from toxic chemicals
   • Request an OSHA inspection, and speak to the inspector
   • Report an injury or illness, and get copies of your medical records
   • See copies of the workplace injury and illness log
   • Review records of work-related injuries and illnesses
   • Get copies of test results done to find hazards in the workplace
7. Slide 7

   Hazards: Machine-related injuries

   • Possible machine-related injuries include:
   • Crushed fingers or hands
   • Amputations
   • Blindness
   • Blindness is a possible machine-related injury
8. Slide 8

   Hazards: Machinery accidents

   • Examples of how machine accidents can occur:
   • Hazardous conditions
   • Missing or loose machine guards Human actions
   • Reaching-in to “clear” equipment Unauthorized persons doing maintenance or using the machines
   • An example of hazard signage to prevent accidents
9. Slide 9

   Hazards: What is machine guarding?

   • Machine Guarding is a means of shielding employees from moving or flying parts and preventing them from accidentally coming into contact with moving pieces of equipment.
   • The transparent guarding (highlighted in red) should be placed to shield the face. The flexible neck can be adjusted to different height/angle, and the magnetic base allows firm attachment to the mill.
   • Propper guarding for use of the mill
10. Slide 10

    Hazards: Basic parts and hazards

    • Three fundamental machine areas:
    • Point of operation
    • Power transmission device
    • Other moving parts –
    • Operating controls such as mechanical or electric power control
    • The three fundamental machine areas on a mill
11. Slide 11

    Hazards: Point of operation

    • The Point of Operation is the area on a machine where work is actually performed on the material being processed (highlighted in orange).
    • The spindle is the rotating part, the cutter is the “drill,” and the workholding/vise is the “table.”
    • The point of operation for the mill
12. Slide 12

    Hazards: Nip points and rotating parts

    • In-running nip points are commonly found among rotating or reciprocating parts. They occur in two scenarios:
    • 1.When machine parts move toward each other
    • 2.When machine parts run past a stationary object
    • Examples of nip points in different mechanisms
13. Slide 13

    Hazards: Hazard Signage

    • To prevent injuries, be aware of hazard signages next to the machinery.
    • An example of hazard signage
14. Slide 14

    Hazards: Flying chips and sparks

    • Chips and other pieces of material may fly off of the mill at the point of operation during cutting.
    • Sparks may occur during cutting, especially at higher speeds or with harder materials such as steel
    • An example of chips created by the mill
15. Slide 15

    Hazards: Preventing injuries and amputations

    • Do not remove any guards or other devices
    • Do not operate the milling machine unless you are trained and authorized to operate the machine
    • Operators must place the jig or vise locking arrangement so that the force is exerted away from the cutter
    • A guard attached to the mill table
16. Slide 16

    Hazards: Preventing injuries and amputations (continued)

    • Turn the spindle off before reaching in towards the Point of Operation, then move the work holding device back to a safe distance when loading or unloading parts and measuring work
    • Do not reach around the cutter or hob to remove chips while the machine is in motion or not locked/tagged out
    • If a machine needs maintenance/service, follow lock out tag out procedures
    • A young worker using the mill
17. Slide 17

    Hazards:

    • Lockout/Tagout
    • Lockout/tagout procedures are safeguarding methods to prevent injury due to hazardous energy sources. If you see the machines with the signs featured in the image or that are under lock and key, please stay away and do not touch or attempt to start it.
    • Examples of Lockout/tagout equipment
18. Slide 18

    Hazards: Best practices

    • Set the guard to clear stock/workpiece
    • Wear Personal Protective Equipment (PPE) at all times
    • Clean up and clear work area
    • An example of hazard signage