New CrewForge episodes are finished weeks ahead of their YouTube date. Here are the next three, free and with no ads. When one goes public on YouTube, the next one takes its place here.
How much do you have to pull to lift a load with a block and tackle or a chain fall? In this lesson we use a live simulator to count parts of line, see why the lead line counts only when it leaves the moving block, measure how far the lead line travels, and add sheave friction with the 10 % rule and a maker's table.
Early copy, no ads · 15 min · AI narration
Before any lift you need two numbers: how much it weighs and where its centre of gravity is. In this lesson we use a live simulator to weigh steel plate, round bar and pipe from their dimensions (490 lb/ft³, 7,850 kg/m³), find the centre of gravity of a skid with a motor on it, work out what each leg carries when the picks are uneven, and see what happens when the centre of gravity sits outside the picks or the hook is off the CG.
Early copy, no ads · 14 min · AI narration · The free lesson for this episode
The working load limit stamped on rigging hardware only holds for a straight pull. In this lesson we use a live simulator to see what an angled pull does to a shoulder eyebolt, why plain eyebolts are for in-line pulls only, how side loading cuts a shackle's rating, and why wire rope bent around a small pin loses strength (the D/d ratio).
Early copy, no ads · 12 min · AI narration
The first four Level 1 rigging lessons, complete: video, written lesson, worked examples, quiz and a printable chapter.
Sling angles, block and tackle, hydraulics, shaft alignment and pump curves: the same tools the videos use.
Sling angles and load angle factors: the full lesson and its printable textbook chapter (PDF).
Hear first when Level 1 early access opens. Members get every new episode early, inside the lessons.
Exam preparation, not a procedure. On the job, check the tag, the manufacturer's data and your lift or work plan.