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…And Now…. The Witch Winch : Building a Practical Gearbox. By Benjamin Kidd. What is a Gearbox?. A box of gears

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the witch winch building a practical gearbox

…And Now…

The Witch Winch:Building a Practical Gearbox

By Benjamin Kidd

ENGR-162/12 - Benjamin W. Kidd

what is a gearbox
What is a Gearbox?
  • A box of gears
  • More specifically, an assembly to which a prime mover (such as a motor, gasoline engine, etc) is mounted to, and interconnects with gears for the purposes of speed and torque alterations (See Basic Practical Mechanics presentation)

ENGR-162/12 - Benjamin W. Kidd

what is a winch
What is a Winch?
  • A device used to wind a rope or cable for lifting or pulling.

From http://www.ramsey.com/winches/

ENGR-162/12 - Benjamin W. Kidd

building a gearbox materials
Building a Gearbox - Materials

DCM-216

All Electronics

GR-5

All Electronics

270-1806

Radioshack

It is recommended to purchase a project box instead of building one.

Bottle Cap

Coat Hanger

ENGR-162/12 - Benjamin W. Kidd

building the gearbox the pinion
Building the Gearbox: The Pinion
  • Mount the pinion gear to the motor shaft – In the case of the DCM-216 and GR-5, the motor shaft must be built up to fit snugly with the gear.

ENGR-162/12 - Benjamin W. Kidd

attaching the pinion
Attaching the pinion
  • Epoxy the pinion gear to the motor (Use epoxy. Glue gun and super glue may not hold.)

ENGR-162/12 - Benjamin W. Kidd

the gearbox
The Gearbox
  • Mount the motor to the Gearbox using the front mounting screws.

ENGR-162/12 - Benjamin W. Kidd

motor mounting above view
Motor Mounting – Above View

ENGR-162/12 - Benjamin W. Kidd

driven gear mounting
Driven Gear Mounting
  • Use same procedure with driven gear as pinion – mount to coat hanger (or other material suitable to be used as a shaft.)

ENGR-162/12 - Benjamin W. Kidd

driven gear mounting1
Driven Gear Mounting
  • Spindle added for “Winch” on driven gear shaft.

ENGR-162/12 - Benjamin W. Kidd

gearbox
Gearbox

ENGR-162/12 - Benjamin W. Kidd

how fast does it wind a string
How fast does it wind a string?
  • To calculate, we need to know the number of times the winch shaft turns per unit time, and the circumference of the winch.

ENGR-162/12 - Benjamin W. Kidd

calculating shaft speed
Calculating Shaft Speed
  • Assumptions
    • Motor RPM = 6000 RPM
    • Gearing Ratio 1:5 (pinion:gear)

ENGR-162/12 - Benjamin W. Kidd

calculating winding time
Calculating Winding Time
  • Need Diameter of Winch Spindle
    • d = 3/8”
  • Find circumference
  • Now calculate winding time

ENGR-162/12 - Benjamin W. Kidd

spindle speed table
Spindle Speed Table

ENGR-162/12 - Benjamin W. Kidd

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