1128500 WPC 2000 User Manual
A-2 Extracts from OSHA and ANSI
Extracts from OSHA Regulation 1910.217
OSHA Regulations PMA Interpretation
OSHA 1910.217 (c).
(c) SAFEGUARDING THE POINT OF
OPERATION. –
(1) General requirements.
(i) It shall be the responsibility of the
employer to provide and insure the usage
of “point of operation guards” or properly
applied and adjusted point of operation
devices on every operation performed on a
mechanical power press. See Table 0-10.
TABLE 0-10
Distance of opening Maximum width of
from point of operation opening (inches)
hazard (inches)
1/2 to 1 1/2 . . . . . . . . . . . . . . . . . . . . 1/4
1 1/2 to 2 1/2 . . . . . . . . . . . . . . . . . . . . 3/8
2 1/2 to 3 1/2 . . . . . . . . . . . . . . . . . . . . 1/2
3 1/2 to 5 1/2 . . . . . . . . . . . . . . . . . . . . 5/8
5 1/2 to 6 1/2 . . . . . . . . . . . . . . . . . . . . 3/4
6 1/2 to 7 1/2 . . . . . . . . . . . . . . . . . . . . 7/8
7 1/2 to 12 1/2 . . . . . . . . . . . . . . . . . . .1 1/4
12 1/2 to 15 1/2 . . . . . . . . . . . . . . . . . . .1 1/2
15 1/2 to 17 1/2 . . . . . . . . . . . . . . . . . . .1 7/8
17 1/2 to 31 1/2 . . . . . . . . . . . . . . . . . . .2 1/8
OSHA 1910.217 (c) (3) (i) (a)
(3) Point of operation devices.
(i) Point of operation devices shall protect the
operator by:
(a) Preventing and/or stopping normal
stroking of the press if the operator’s hands
are inadvertently placed in the point of
operation.
Presence-sensing device
(c) (3) (i) (a) Refers to the functional
requirement of a presence-sensing device
which prevents and/or stops normal stroking of
the press.
OSHA 1910.217 (c) (3) (iii)
(iii) A presence-sensing point of operation
device shall protect the operator as provided
in paragraph (c) (3) (i) (a) of this section, and
shall be interlocked into the control circuit to
prevent or stop slide motion if the operator’s
hand or other part of his body is within the
sensing field of the device during the
downstroke of the press slide.
(a) The device may not be used on
machines using full revolution clutches.
(b) The device may not be used as a
tripping means to initiate slide motion.
European method (curtain of light) uses self trip
safety system effectively. Variance applied for
11/17/73 by Interlake Stamping Company to use
this fail safe system.
(c) The device shall be constructed so that
a failure within the system does not prevent
the normal stopping action from being
applied to the press when required, but
does prevent the initiation of a successive
stroke until the failure is corrected. The
failure shall be indicated by the system.
When failure occurs, the best indication is the
press won’t run.
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