Which is the proper procedure to reeve a...

Which is the proper procedure to reeve a...

Question 1 of 3109366636ee728f7522a1c518270

Which is the proper procedure to reeve a right-angle threefold purchase?

Question 1 of 31093

Q

Which is the proper procedure to reeve a right-angle threefold purchase?

🔍 Key Concepts

• Block and tackle terminology – understand what is meant by “top block,” “bottom block,” and a threefold purchase • How a right‑angle lead affects the direction the fall (running end of the line) must exit the block • Rules for reeving without crossing: keeping the line fair from one sheave to the corresponding sheave

💭 Think About

• Sketch the top and bottom blocks with three sheaves each, then draw how the line must pass so the fall comes out at a right angle to the standing part • Ask yourself: on which sheave must you begin so that, after alternating between top and bottom blocks, the final lead of the fall is clean and at right angles? • Consider what happens if you start in each of the four suggested positions: does any starting point force the line to cross or give a bad lead?

✅ Before You Answer

• Verify which block is the moving (lower) block and which is the fixed (upper) block in a standard threefold purchase • Check that your chosen starting sheave allows the fall to emerge from the correct side of the system for a right‑angle lead • Make sure your reeving pattern alternates between blocks correctly and that no parts of the line cross over each other in any sheave.