Rockford Systems, LLC.
Call: 1-800-922-7533
27
SSC-1500 Part Revolution Solid-State Control
SECTION 3—INSTALLATION OF COMPONENTS
Palm Button Assembly
(continued)
OS HA 1910.217 for two-hand control used as a method of safeguarding the point of operation as follows:
(c)(3) Point-of-Operation Devices
(i) Point-of-Operation devices shall protect the operator by:
(e) Requiring the application of both of the operator’s hands to machine operating controls and locating such controls at such a safety distance
from the point of operation that the slide completes the downward travel or stops before the operator can reach into the point of operation
with his hands;
(vii) The two-hand control device shall protect the operator as specified in paragraph (c)(3)(i)(e) of this section.
(a) When used in press operations requiring more than one operator, separate two-hand controls shall be provided for each operator, and shall
be designed to require concurrent application of all operator controls to activate the slide. The removal of a hand from any control button shall
cause the slide to stop.
(b) Each two-hand control shall meet the construction requirements of paragraph (b)(7)(v) of this section. (See paragraph (b)(7)(v) on page 24.)
(c) The safety distance (Ds) between the two-hand control device and the point of operation shall be greater than the distance determined by
the following formula: (Also, see Figure 3.5.)
Ds = 63 inches/second x Ts; where:
Ds = minimum safety distance (inches);
63 inches/second = hand speed constant; and
Ts = stopping time of the press measured at approximately
90° position of the crankshaft rotation (seconds).
(d) Two-hand controls shall be fixed in position so that only a supervisor or safety engineer is capable of relocating the controls.
Chart for OSHA Formula Only
Ts = Stopping Time in Seconds
Ds = Safety Distance for Two-Hand Control
.055—3
1
⁄
2
”
.063—4”
.072—4
1
⁄
2
”
.079—5”
.087—5
1
⁄
2
”
.095—6”
.103—6
1
⁄
2
”
.111—7”
.119—7
1
⁄
2
”
.126—8”
.134—8
1
⁄
2
”
.142—9”
.150—9
1
⁄
2
”
.158—10”
.166—10
1
⁄
2
”
.174—11”
.182—11
1
⁄
2
”
.190—12”
.198—12
1
⁄
2
”
.206—13”
.214—13
1
⁄
2
”
.222—14”
.230—14
1
⁄
2
”
.238—15”
.246—15
1
⁄
2
”
.253—16”
.261—16
1
⁄
2
”
.269—17”
.277—17
1
⁄
2
”
.285—18”
.293—18
1
⁄
2
”
.301—19”
.309—19
1
⁄
2
”
.317—20”
.325—20
1
⁄
2
”
.333—21”
.341—21
1
⁄
2
”
.349—22”
.357—22
1
⁄
2
”
.365—23”
.373—23
1
⁄
2
”
.380—24”
.388—24
1
⁄
2
”
.396—25”
.404—25
1
⁄
2
”
.412—26”
.420—26
1
⁄
2
”
.428—27”
.436—27
1
⁄
2
”
.444—28”
.452—28
1
⁄
2
”
.460—29”
.468—29
1
⁄
2
”
.476—30”
.484—30
1
⁄
2
”
.492—31”
.500—31
1
⁄
2
”
.507—32”
.515—32
1
⁄
2
”
.523—33”
.531—33
1
⁄
2
”
.539—34”
.547—34
1
⁄
2
”
.555—35”
.563—35
1
⁄
2
”
.571—36”
Ts Ds
Figure 3.5
*Based on the 63 inches/second hand speed constant.
Ts Ds
Ts Ds
Ts Ds
Ts Ds
(Continued on next page.)
