• 3D Model

Info

Added: Feb 14, 2018 10:18
Author: Jeff Glass
License: Creative Commons - Attribution - Share Alike

Description

This is a demonstrator of a rack-and-pinion gear mechanism. The 20 pinion gear teeth have an involute profile, while the 15 rack teeth have a flat trapezoidal profile. Both have a module of 2mm.

This builds on an earlier gear demonstrator of mine which investigated the involute tooth profile.

The holes in the base a meant to accomodate a #8 screw for mounting.

Print Settings

Printer:

Wanhao Duplicator i3

Rafts:

No

Supports:

No

Resolution:

0.2mm

Infill:

%20

Notes:
Print with a low bed heat (or none) to avoid any elephant's foot, which will cause mechanical interference between the gear teeth and make additional post processing necessary.

Post-Printing

This model is designed to be assembled using three M3x5mm Threaded Inserts, inserted into the slightly undersized holes using a soldering iron. (Matterhackers has a good guide to this method). The pinion is held by a small (~8mm x m3) machine screw. The rack is guided by two screws of the same type.

How I Designed This

The Involute profile was hand-modelled in Fusion 360 using an approximation method. The rack dimensions were calculated using the equations in Part 3 of This Page. and verified with the Rack and Pinion Calculator from Otvinta.

Files

File name File size
LICENSE.txt 194.00 B
README.txt 3.20 KB
attribution_card.html 2.16 KB
files/Base.stl 151.06 KB
files/Pinion.stl 255.94 KB
files/Rack.stl 67.66 KB
images/c0ff20ca24229376939794510ac30a9b_preview_featured.jpg 38.43 KB
images/6a5af92b03ceabf4fd25141aa65d2c3d_preview_featured.JPG 53.85 KB
images/b1e22cad43c1f7503c7b23d5b3ef9bae_preview_featured.jpg 36.95 KB
images/7c2f68732aad977192f02e3fdc93e038_preview_featured.JPG 95.05 KB
images/b40c611108cad22f51b44574cc41e2b5_preview_featured.jpg 35.04 KB
images/98c2ea91a3f332b468d30862fa5a2b7b_preview_featured.JPG 101.86 KB
images/b2b41831ee9959308aebd27560a936fc_preview_featured.jpg 42.56 KB

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