Burgess BK3 Bandsaw Disaster and Repair

Some pieces of workshop equipment generate a sentimental attraction that is hard to break.  One such piece of kit is my Burgess BK3 bandsaw which is ancient but has up to now worked reasonably well for my needs.   I bought it on EBay from an owner in Lancashire and remember a nice day trip to collect it.

It is a very useful machine and gets pressed into use day in and day out.   That is until the other day when the blade came off with a loud twang.  On inspection the drive wheel had lost part of its blade outer retaining flange.   It appeared to be very old brittle plastic and the damage was really to be expected given the vintage of the device.

After head scratching I designed a replacement edging strip in Fusion 360 which I 3D printed and glued in place.   Fingers crossed that will give the machine a reprieve and extend its life.

In the course of looking for possible spares (no chance) I came across a reference to modifications to the BK3 in Model Engineer to improve the blade tracking and speed settings.  (ME Vol 170 Issue 3944 and Vol 172 Issue 3962).  The members of my local model engineering club came up trumps with copies of these articles for me.

The guide modification consisted of replacing the two stud guides with ball bearings.  While the machine was in pieces it seemed like a good idea to implement this modification.  The Fusion 360 3D model is shown below. The blade is sandwiched between the two ball races and these can be slid in and out and then be fixed in place with the cap head screws once the correct location is found to guide the blade.

I drew the replacement guide block assembly in Fusion 360 and milled it on the Tormach CNC from brass.   The 1/2″ bearings came from BearingBoys.

All is now re-assembled and running really smoothly.  The blade prefers to run in straight lines which is a revelation.

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Clough42 Electronic Leadscrew Project Implementation Notes

I have been avidly watching Clough42 on YouTube.  James comes over as a really nice guy and his presentation of his projects is excellent.

My principle interest is the Electronic Leadscrew modification to lathes.  When installed this removes all the hassle of gearboxes and look up tables to be able to cut both Imperial and Metric screw threads and to set X axis movement feed rates.

The concept is simple but his implementation is second to none.  A rotary encoder is fitted to the spindle to count revolutions of the chuck and a stepper motor (or servo hybrid) controls the rotation of the leadscrew.  The resulting feed speed is derived from look up tables.  The whole installation is controlled by a Texas Instruments LaunchPad C2000 microcontroller development board.

I have documented how I implemented this on my Myford Super 7 Big Bore lathe and the pdf can be downloaded below.   There is also a ZIP file of all the Fusion related models for either CNC or 3D printing.

Electronic Leadscrew on Myford Super 7 Full Write Up

Electronic Leadscrew Fusion 360 Files

Update : –

Painted control panel for Clough42 Electronic Leadscrew
Finally got the Clough42 Electronic Leadscrew control panel box painted and rather pleased with the result.

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