Skip to content
World 5 · Advanced Compound Machines · 8 min · PRO

Gear Train into a Screw Jack

A geared-down crank turns a screw jack

PRO · Simple Machines

World 5: Advanced Compound Machines is part of PRO

The first world of Simple Machines is free. PRO opens the other 32 lessons in 6 worlds — simulations, quizzes and all.

  • Lever into a Block and Tackle
  • Winch into a Ramp Hoist
  • Zero-force members
  • A stable truss with the fewest bars
  • Pratt, Howe or Warren?
PRO includes
  • All 26 labs — every world, every lesson
  • Practice exams and certificates

$8.33/mo, billed yearly ($99.99) · or $39.99 monthly

Unlock Simple MachinesTry the free world
← Job Order: The Heavy LiftLever into a Block and Tackle →

Report a mistake

What is wrong?
0 / 2000 · at least 10 characters
Sent along with your report
  • Page
  • About Gear Train into a Screw Jack — Simple Machines · mechanisms/u5_1
Plus your browser type. Reports go to our support system; see the privacy notice.