Making a 4-Jaw Chuck Backplate for the Proxxon PD 250/e Lathe

Making a backplate which fits a 4-jaw independent lathe chuck to the Proxxon PD 250/e using 42CrMo4 engineering steel.

A 4-jaw independent chuck is a vital piece of lathe equipment, but finding
the right chuck for this lathe took me a while. I finally found one light enough to be useable while still being extremely capable. To ensure the best possible performance the back plate needs to be very rigid, but on a small lathe like this it can't be too heavy.

Working on a part this big, made of tough material was a huge challenge on a Very Small Lathe. Check out the problems I faced, and how I overcame them in this video.

This video is part of Tool Fest 2021! Look for other videos with the #toolfest2021 hashtag, and post on other social media, all coming out today! Many thanks to Emma's Spareroom Machineshop for making this happen, and thanks to Chirpy's Tinkering for the teaser video.

Emmas Spareroom Machineshop
   / emmaritson  

Chirpy's Tinkerings:
   / chirpystinkerings  

00:00 Introduction
01:09 Cutting the Material
04:28 Facing the Disc
15:04 Boring the Through Hole
18:02 Boring the Spindle Pocket
23:39 The Spindle Hole Pattern
30:14 The Chuck Register
37:01 The Chuck Hole Pattern
47:13 Testing the Chuck
49:03 Next Video Preview

Materials:

80mm hot rolled 42CrMo4 engineering steel

Tools:

Proxxon PD250/e Lathe
Proxxon FF230 Milling Machine

Edited with:
Davinci Resolve 17.4.2
audacity 3.0.2

Music:
Easy Lemon by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/...)
Source: https://incompetech.com/music/royalty...
Artist: http://incompetech.com/