Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!

CVA Lathe Metric Gear Change set

by JBFromOZ, published

CVA Lathe Metric Gear Change set by JBFromOZ Dec 14, 2012
0 Share
Download All Files

Thing Apps Enabled

Order This Printed View All Apps


Liked By

View All

Give a Shout Out

If you print this Thing and display it in public proudly give attribution by printing and displaying this tag.

Print Thing Tag

Thing Statistics

13913Views 3945Downloads Found in Machine Tools


A printable set of metric change gears to allow metric screw cutting on a CVA toolroom or Monarch 10EE lathe.


If you enjoy this item and want to support me making more parts, like and susbcribe my YouTube channel JBFromOZ

32DP 20 PA gear set,

starting with the 127 tooth, the first test print attached, expecting this will not be printable with my current setup, however one day it may just be possible.

Converting Diametral Pitch to Circular Pitch and then to Pitch Diameter.

Number of Teeth * 32/25.4 (32 teeth per diametral inch) measurements in mm

Further work into understanding Greg's parametric gear creation, I finally am closer to understanding a key issue. the module appears to be metric, whereas 32DP is an imperial designation (bring on the stormtroopers!)

32 teeth per inch of diameter of gear wheel. so to use Diametral Pitch in Greg's Gears, I need this to be a metric value, 32/25.4 (so we have teeth per mm of diameter of the gear)

a 127 tooth 32DP gear should be 127/32*25.4mm = 100.80625 mm pitch circle diameter.

the actual gear measures this plus addendum 2 ( to top of tooth )
the valleys of the teeth should measure this minus dedendum
2 across the diameter

previous output was not producing this.

By using

module testDPGear()

the output gear is now a lot closer to the required size, with slight variation expected to be due to slicing configuration.

A full set appears to be
Assorted Stud Gears:

127T/48T Composite
127T/72T Composite

Idler 154T (possibly 156T, but should be close enough to work)

48T (gearbox drive)

photographs of lathe changewheels located at http://www.practicalmachinist.com/vb/monarch-lathes/cva-metric-changewheels-192963/

I added a lid to the box.

More from Machine Tools

view more

All Apps

3D Print your file with 3D Hubs, the world’s largest online marketplace for 3D printing services.

App Info Launch App

Auto-magically prepare your 3D models for 3D printing. A cloud based 3D models Preparing and Healing solution for 3D Printing, MakePrintable provides features for model repairing, wall thickness...

App Info Launch App

Kiri:Moto is an integrated cloud-based slicer and tool-path generator for 3D Printing, CAM / CNC and Laser cutting. *** 3D printing mode provides model slicing and GCode output using built-in...

App Info Launch App
KiriMoto Thing App

With 3D Slash, you can edit 3d models like a stonecutter. A unique interface: as fun as a building game! The perfect tool for non-designers and children to create in 3D.

App Info Launch App

Print through a distributed network of 3D printing enthusiasts from across the US, at a fraction of the cost of the competitors. We want to change the world for the better through technology, an...

App Info Launch App

Quickly Scale, Mirror or Cut your 3D Models

App Info Launch App

3D Print a wide range of designs with Treatstock. Easy to use tools to get the perfect result. The global 3D printing network that connects you with high-quality and fast working print services nea...

App Info Launch App

Hi Alastair, I am not sure, one of the chaps on #reprap pasted me that image, which i used to verify that I got the Gregs involute Gear module working correctly. I then used openscad to generate all of the gears


What is the Gear Software in the picture?


Looks like an older version of "GearTrax".

i printed out the box for the gears, with 0.1 hex fill, 2 perimeters, took 23h 30m with 2 restarts due to stripped filament. overall is 180 x 130 x 105mm call me crazy ;-)