Rockford Systems, LLC
1-800-922-7533 (U.S.A. only)
7
(Continued on next page.)
.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”
*Based on the 63 inches/second hand speed constant.
SECTION 1—IN GENERAL
Stop-Time Measurement Device
Ts Ds*
Ts Ds*
Ts Ds*
Ts Ds*
OSHA REGULATIONS AND ANSI STANDARDS
(continued)
(c)(3)(vii) Two-hand control (part revolution only)
(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 operators’ 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.
(c) The safety distance (Ds) between each two-hand control device and the point of operation shall be greater than the
distance determined by the following formula:
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.
Single Stroke - Two-Hand Control
(v) Two-hand controls for single stroke shall conform to the following requirements:
(a) Each hand control shall be protected against unintended operation and arranged by design, construction, and/or
separation so that the concurrent use of both hands is required to trip the press.
(b) The control system shall be designed to permit an adjustment which will require concurrent pressure from both hands
during the die closing portion of the stroke.
(c) The control system shall incorporate an antirepeat feature.
(d) The control systems shall be designed to require release of all operators’ hand controls before an interrupted stroke can
be resumed. This requirement pertains only to those single stroke, two-hand controls manufactured and installed on or
after August 31, 1971. (Refer to (c)(5)(ii).)
Safety Distance Chart for the OSHA Formula Only
For quick, easy reference for the safety distance, refer to the chart below. Before the mounting location of the presence
sensing device (light curtain) or two-hand control can be determined, the stopping time (Ts) of the press must be obtained.
We suggest that this time be measured with a stop-time Measurement Device. Consult factory for information on portable
stop-time devices or for stop-time devices that can be built into the control.
Ts = Stopping Time (seconds); Ds = Safety Distance (inches).
Table 1.1
