Sheet Metal (C-43) · Lesson 8 of 8

Press Brake Safeguarding: Safety Distance Ds = 63 x Ts (8 CCR 4214, 4208)

"Press Brake Safeguarding: Safety Distance Ds = 63 x Ts (8 CCR 4214, 4208)" is lesson 8 of 8 in the Sheet Metal (C-43) Learning Hub. It opens with "What the Press Brake Orders Cover" and works through 5 short steps, then a worked example you can check yourself against.

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Steps in this lesson

  1. What the Press Brake Orders Cover
  2. The Devices Section 4214 Allows
  3. The Safety Distance Formula
  4. Rules for Presence-Sensing Devices
  5. Stopping Time Changes, So the Distance Changes

The worked example in the course applies this lesson to a realistic job in 6 steps, from "Calculate the required distance" through "A two-hand control works the same way".

What you'll be able to do

  • Explain the main idea of "Press Brake Safeguarding: Safety Distance Ds = 63 x Ts (8 CCR 4214, 4208)" in plain language you can use on the exam.
  • Apply this step with confidence: "The Safety Distance Formula".
  • Apply this step with confidence: "Rules for Presence-Sensing Devices".
  • Apply this step with confidence: "Stopping Time Changes, So the Distance Changes".
  • Test yourself on the worked example and the quick-check quiz inside the classroom.
Press Brake: Safety Distance Ds = 63 x TsPress brake, side view (4 px = 1 in)ramlight curtain (sensing field)needednow25.2 in20 inpoint of operationSafety distance (Sec. 4208)Ds = 63 in/s x TsTs = stopping time at about 90 degreesTs = 0.40 s: Ds > 63 x 0.40 = 25.2 inCurtain at 20 in: FAILMove it to 26 in: PASSBrakes wear, Ts rises to 0.55 s:Ds > 63 x 0.55 = 34.65 in26 in is no longer enough.A brake monitor must stop the nextstroke (Sec. 4200(b)).Two-hand controls use the same formula.Curtain at 20 in fails: it must be more than 25.2 in awayIf wear raises Ts to 0.55 s, the distance needed grows to 34.65 in.8 CCR Sec. 4208(c)(4), 4208(g)(3), 4214, 4200(b), 4193(m). 63 in/s is the hand speed constant.CC
The diagram for this lesson, exactly as it appears in the Learning Hub.

The first steps of this lesson

Step 1: What the Press Brake Orders Cover

Title 8 Section 4189 applies Article 55 to mechanically or hydraulically powered machines that shear, punch, form, or assemble metal by means of tools or dies attached to slides, which includes press brakes. Section 4214(a) says a mechanically or hydraulically powered press brake must be guarded so that it does one of three things: restrains the operator from reaching into the point of operation, inhibits machine operation if the operator hands are in the point of operation, or automatically withdraws the hands. Section 4214(e) sends you to Sections 4207 (guards) and 4208 (devices) for the details.

Step 2: The Devices Section 4214 Allows

Section 4214(b) lists devices that accomplish those three things, and says the list is not restricted to these: a presence-sensing device, a holdout or restraint device, a pullout device, a two-hand control device, a Type A or Type B gate or movable barrier device, a fixed barrier guard, an arrangement of stops and holding devices (such as a feed table) that lets the controls be remote, or another guard or feed system that effectively keeps the hands out of the point of operation. Only where none of those is practical does Section 4214(b)(9) allow a fallback: a qualified operator who stays a safe distance with hand tools or by material size, using only general-purpose press brakes with general-purpose dies. A sweep device may not be used (Section 4208(e)), and hand feeding tools are not a guard (Section 4208(i)).

The remaining 3 steps, the worked example and the quiz are in the course. This is a preview. The full lesson, with the step-by-step explanations, a worked example and a quick-check quiz, is inside the classroom.

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