Mich. Admin. Code R. 408.12463

Current through Vol. 24-19, November 1, 2024

Section R. 408.12463 - Point of operation devices

Rule 2463.

(1) Point of operation devices shall protect the operator by 1 of the following methods:

(a) Preventing or stopping, or both, the normal stroking of a press if the operator's hands are inadvertently placed in the point of operation.

(b) Withdrawing an operator's hands if they are inadvertently located in the point of operation as the dies close or preventing the operator from inadvertently reaching into the point of operation as the dies close.

(c) Preventing the operator from inadvertently reaching into the point of operation at all times.

(d) Requiring the application of both of the operator's hands to the machine's operating controls and locating the controls at a distance from the point of operation that will permit the slide to complete the downward travel or stop before the operator can reach into the point of operation with his or her hands.

(e) Enclosing the point of operation before a press stroke can be initiated and maintaining this closed condition until the motion of the slide ceases.

(f) Enclosing the point of operation before a press stroke can be initiated so as to prevent an operator from reaching into the point of operation before die closure or before cessation of slide motion during the downward stroke.

(2) A gate or movable barrier device shall protect the operator according to the following:

(a) A type-A gate or movable barrier device shall protect the operator as prescribed in subrule (1)(e) of this rule.

(b) A type-B gate or movable barrier device shall protect the operator as prescribed in subrule (1)(f) of this rule.

(3) The presence-sensing point of operation device shall protect the operator as provided in subrule (1)(a) of this rule and shall be interlocked into the control circuit to prevent or stop slide motion if the operator's hand or other body part is within the sensing field of the device during the down-stroke of the press slide. All of the following provisions apply to a presence-sensing point of operation device:

(a) The device shall not be used on machines that use full-revolution clutches.

(b) The device shall not be used as a tripping means to initiate slide motion.

(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.

(d) Bypassing the protection function of a presence-sensing device during the upstroke of the press slide is permitted for the purpose of parts ejection, circuit checking, and feeding.

(e) The safety distance (Ds) from the sensing field to the point of operation shall be greater than the distance that is determined by the following formula:

D(s) 63 inches/second X T(s)

where:

D(s) minimum safety distance (inches); 63 inches/second = hand speed constant; and

T(s) stopping time of the press measured at approximately 90 deg. position of crankshaft rotation (seconds).

(f) Guards shall be used to protect all areas of entry to the point of operation that are not protected by the presence-sensing device.

(4) The pull-out device shall protect the operator as prescribed in subrule (1)(b) of this rule and shall include attachments for each of the operator's hands. All of the following provisions apply to a pull-out device:

(a) Attachments shall be connected to, and operated only by, the press slide or upper die.

(b) Attachments shall be adjusted to prevent the operator from reaching into the point of operation or to withdraw the operator's hands from the point of operation or other pinch points before the dies close.

(c) A separate pull-out device or other safeguarding device that is in compliance with the provisions of this standard shall be provided for each operator if more than 1 operator is used on a press.

(d) Each pull-out device in use shall be visually inspected and checked for proper adjustment at the start of each operator's shift, after a new die setup, or when operators are changed. Necessary maintenance or repair, or both, shall be performed and completed before the press is returned to production. The employer shall maintain records of these inspections and the maintenance work performed.

(e) Bolts, locator pins, or any other projections shall not be located in a manner that would catch the pullback cable or wristlet and hold an operator's hand in a pinch point or the point of operation.

(5) A sweep device shall not be used for point of operation safeguarding on a mechanical power press.

(6) A holdout or a restraint device shall protect the operator as prescribed in subrule (1)(c) of this rule and shall include attachments for each of the operator's hands. These attachments shall be securely anchored and adjusted so that the operator is restrained from reaching into the point of operation. A separate set of restraints or other safeguarding device that is in compliance with the provisions of this standard shall be provided for each operator if more than 1 operator is required on a press.

(7) The 2-hand control device shall protect the operator as prescribed in subrule (1)(d) of this rule. All of the following provisions apply to a 2-hand control device:

(a) When used in press operations requiring more than 1 operator, separate 2-hand controls shall be provided for each operator and shall be designed to require concurrent applications of all operator's controls to activate the slide. The removal of a hand from any control button shall cause the slide to stop.

(b) Each 2-hand control that is used as a point of operation device shall be operated in the single-stroke mode only.

(c) When hand-in-die loading or unloading is used, the safety distance (Ds) between each 2-hand control device and the point of operation shall be greater than the distance determined by the formula prescribed in subrule (3)(e) of this rule.

(d) The position of the 2-hand controls shall be established and fixed in accordance with the provisions of subrule (1)(d) of this rule or subdivision (c) of this subrule, whichever shall apply. Only the supervisor or safety engineer may authorize relocating the controls.

(8) The 2-hand trip device shall protect the operator as prescribed in subrule (1)(d) of this rule. The device shall conform as follows:

(a) When used in press operations that require more than 1 operator, separate 2-hand trips shall be provided for each operator and shall be designed to require concurrent application of all operator's controls to activate the slide.

(b) Each 2-hand trip shall meet the construction requirements of R 408.12434.

(c) The safety distance (D(m)) between the 2-hand trip and the point of operation shall be greater than the distance determined by the following formula:

D(m) 63 inches/second X T(m);

where:

D(m) minimum safety distance (inches); 63 inches/second=hand speed constant;

And

T(m) the maximum time the press takes for the die closure after it has been tripped (seconds). For full revolution clutch presses with only one engaging point T(m) is equal to the time necessary for one and one-half revolutions of the crankshaft. For full revolution clutch presses with more than one engaging point, T(m) shall be calculated as follows:

T(m) [1/2 + (1 divided by number of engaging points per revolution)] X time necessary to complete one revolution of the crankshaft (seconds).

(d) Two-hand trips shall be established and fixed and only a supervisor or safety engineer may authorize their relocation.

Mich. Admin. Code R. 408.12463

1979 AC; 1990 AACS; 1993 AACS; 2016 MR 22, Eff. 11/28/2016