Making a Boring Head Arbor for the Proxxon FF 230 Milling Machine using the Proxxon PD 250/e Lathe

The first 1000 people who click the link will get 2 free months of Skillshare Premium: https://skl.sh/adventureswithaverysma...

For a long while I've wanted to be able to use a boring head with the Proxxon FF 230 milling machine, but it hasn't been easy to sort out. Most commercially available boring heads use an arbor to fit into a standard taper such as NMTB, R8, or Morse, but the Proxxon just has a short collet taper machined directly into the spindle.

The most obvious solution was to make an arbor with a straight shank to fit into a collet, but the largest collet is 10mm, which is quite a narrow shank for something as heavy as the smallest boring head I could find for a reasonable price. Instead I decided to make an arbor which would screw onto the outside of the spindle using the collet clamping thread.

Onshape model:
https://cad.onshape.com/documents/d44...

This project has been a major lesson in difficult machining. To start with it's a large part for a lathe as small as the Proxxon PD 250/e, but I also made life harder by choosing difficult material. EN24T is similar to pre-heat-treated 4340, and can be very hard work to machine. In this video I try and show all the problems I had, do my best to explain how I got around them, and show where the project nearly failed.

It's a lot of content, and I had to squeeze it into 20 minutes to be eligible for Emma's Spareroom Machineshop toolmaking competition, which can make the pace rather fast. Keep up, it's gonna be a wild ride.

Check out this playlist of all the competition entries:

   • #tmc2020  

#TMC2020

This video was sponsored by Skillshare.

The links below will financially support the channel if you use them to buy stuff:

Machines:
Proxxon PD 250/e Lathe: https://ebay.to/3eFtyxc
Proxxon FF 230 Milling Machine: https://ebay.to/3fEWDua

Material:
EN24T 45mm Round Bar: https://ebay.to/2WoFgG3

Tools:
Lathe threading tool, 10mm, right handed: https://bit.ly/3h8SCyo
Brazed Carbide lathe tool set: https://bit.ly/3ha8K2m
DCMT Insert Lathe Tool: https://bit.ly/3eyqFhD

00:00 Introduction
01:38 Cutting and cleaning up the stock
03:39 Drilling and boring the internal thread
08:55 Single pointing the internal thread
11:58 Turning the external thread
15:03 Single pointing the external thread
18:02 Testing out the arbor

Edited with:
kdenlive 20.11.70
audacity 2.3.3

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/