1/15th Ton Jack Screw

**Needle Roller Worm Gear Jack Screw**

A DC motor driven version of this jack screw can be found here:
http://www.thingiverse.com/thing:2219156

**Description:**
Identical design as an actual jack screw used in industry down to the bearings, gearing, and how the preload is adjusted. Some changes were made to the housing and gears so that it can be printed without supports. Every part is 3D printable with the exception of the needle roller bearings which I used dowel pins for.

**Specifications:**
Worm Reduction: 30:1, 3/8” hex output shaft, anti-rotation keyway, 2” total travel, 1” dia. lead screw, M6 base mounting holes, M5 nut traps in tooling plate, Load rating: 150lbs Max. Working load should be less.

**Thread Pitch Options:**
1. Single Start: 1”-5 , Lead = .2” / with worm reduction per rev = .0067”
2. Double Start: 1”-2, Lead = .5” / with worm reduction per rev = .0167”
3. Quadruple Start: 1”-1, Lead = 1” / with worm reduction per rev = .0333”

**Required hard