Pennsylvania Code
Title 34 - LABOR AND INDUSTRY
Part I - Department of Labor and Industry
Chapter 39 - SAFETY STANDARDS-GENERAL
Subchapter A - SAFE PRACTICES
RECOMMENDATIONS
Section 39.24 - Machine tools

(a) Punch presses. Punch press operators should not remove any safeguards without the permission of the foreman. The driving motor on punch presses shall be shut down before dies are changed, and power shears should be shut down before any adjustments are made on them. The motor of any machine should be shut down when unattended.

(b) Lathes. No chuck or face plate should be put on a lathe by power, nor should any chuck wrench or key be left in a chuck. When filing on a lathe, the file should be held so that if it is forced back it will not be forced against the user, but to one side. Filing should be left-handed with the right hand across stock when filing near the chuck end of a lathe.

(c) Drills. Any material to be drilled should be securely fastened, but never held by hand. Hands, cotton waste or rags should never be used to brush borings away from the work; a brush should always be employed for this purpose.

(d) Grinders. Any material to be ground should be held firmly against the steady rest in front of the wheel. Such steady rest should be properly adjusted and as near to the wheel as possible. The sides of emery wheels should never be used for grinding unless they are designed for side grinding.

(e) Air hammer. No air hammer should be laid down until the tool is removed from such hammer, unless the tool is held in place by a safety catch. It should be ascertained that the coupling of the air hose is secure.