1/15th Ton Jack Screw

thingiverse

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: This design is identical to an actual industrial jack screw, including the bearings, gearing, and preload adjustment method. Some changes were made to the housing and gears so that it can be printed without supports. Every part is 3D printable except for the needle roller bearings, which I used dowel pins for. Specifications: Worm Reduction: 30:1 Output Shaft: 3/8” hex Anti-Rotation Keyway Total Travel: 2” Lead Screw Diameter: 1” Base Mounting Holes: M6 Nut Traps in Tooling Plate: M5 Load Rating: 150lbs Max. Working Load Should Be Less. Thread Pitch Options: Single Start: 1”-5, Lead = .2”, Worm Reduction Per Rev = .0067” Double Start: 1”-2, Lead = .5”, Worm Reduction Per Rev = .0167” Quadruple Start: 1”-1, Lead = 1”, Worm Reduction Per Rev = .0333” Required Hardware: 1/8" DIA. X 3/8" LG. DOWEL PIN – 24X (FOR DRIVE SHAFT BEARINGS) 3/16" DIA. X 1/2" LG. DOWEL PIN – 12X (FOR DRIVE SHAFT BEARINGS) M3 X .5 - 10MM LG. SET SCREW (OR SHCS) – 4X M3 X .5 HEX NUT – 10X M3 X .5 SOCKET HEAD CAP SCREW 10MM LG. – 6X M5 x 0.8 HEX NUT (FOR MOUNTING TO THE TOOLING PLATE) Required Prints for Complete Assembly: Jack Screw Housing Housing Cap Worm Gear (Optional Starts) Lifting Screw (Optional Starts) Drive Gear Drive Bearing Cap (2X) Drive Bearing Shim Small Roller Cage (2X) Large Roller Cage (2X) Crank Handle Handle Swivel Dust Cover Bearing Shim (PRINT AT ASSEMBLY) Riser Base (OPTIONAL) Printing Notes: Before printing, select the desired thread pitch for your application; single, double, or quadruple. Make sure the screw pitch matches the nut pitch. No supports are required for any of the parts. I printed the drive shaft on a raft to keep it stable since it will need to be printed vertical. Assembly Instructions: Set a bearing cap face up on the table and insert the smaller roller cage and fill it with 1/8" dowel pins (24X). Next install the worm gear, then the second cage, and the remaining 3/16” dowel pins. Put four M3 nuts and set screws in the four nut traps on the housing cap and thread the cap into the housing. Note: Socket head cap screws can be substituted for the setscrews as it will make it a lot easier to install. Set the tightness of the cap so you get the proper amount of preload on the bearings. The drive shaft should spin freely but not be too sloppy when you have the correct amount of preload on the rollers. Once set properly, tighten the set screws to keep the cap in position. Install the swivel on the handle and the handle on the jack screw. Insert the lifting screw into the cap and turn the handle to thread it into the worm gear. Thread the dust cover into the back of the housing. Finished! General Notes: Because I was limited by my printer's small build area, I could only achieve 2” of travel. With an extension on both sides, it would be possible to link several jacks together. If you would like a screw with more travel or double shaft extension, let me know. It would be advisable to use Lithium grease on both the gears, threads, and bearings. Print Settings: Printer: Monoprice Select Mini Rafts: No Supports: No Notes: I would use a raft to stabilize the drive shaft when printing, but other than that, no supports or rafts are required.