This short article was prompted by a request in MEW from Geoff Garrett asking about some cutters he had and did not know what they were. They were indeed Clarkson Deadlock cutters, easy for me to identify because I had used them many times in industry and had several in my “armoury”, photo 1.
However, I had only one size of mandrel which suited the larger cutters I had: 1½” & 2” diameter these have a spigot diameter of ¾” and a ¾” x 12 BSF thread. The other cutters I have are 1” diameter these are threaded ½” Whitworth with a corresponding ½” bore for location on the mandrel. I had somewhat perilously used these with VERY light cuts mounted on a “temporary” mandrel made from a ½” Whitworth bolt, photo 2. Now was the time to remedy this and make a properly manufactured mount and thus reap the befit of being able to use the cutters to the best advantage.
Not having the ability to use CAD after some careful measuring and a sketch I produced a working drawing the longhand way — tech drawing! Figure 1.
I had a No2 Morse taper blank in stock, purchased some years ago it was much larger on the blank end than most of the ones available, it came from Myford Nottingham, I see they still sell them today. As an aside I don’t understand why most other suppliers have such a small blank end? The cost of a larger one would be minimal and increases the possible uses greatly IMO.
First job was to drill and tap the Morse taper end to accept a drawbar, this was ⅜ BSF. I chose this size to match the other original mandrel, photo 3.
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Denne historien er fra November 2019-utgaven av Model Engineers' Workshop.
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Readers' Workshops - Patrick Cubbon
Patrick Cubbon describes his workshops – a portable one from 1963 and the current accommodation
Desktop Gear Hobbing
Toby Kinsey has designed this fascinating piece of gearmaking equipment
The John Stevenson Trophy 2020
Many readers and forum members will remember John Stevenson, a contributor to MEW but best known for his larger-than life presence on the Model Engineer forum.
From the Archives: Twist drill Sharpening by the Four Facet Method
Giles Parkes, MEW Issue 64, February/March 2000
Dividing on the Warco 220 Lathe
Peter Shaw describes a mandrel dividing attachment for this popular lathe that can be adapted to fit many other benchtop machines
Choosing Steels
Stub Mandrel offers some advice on choosing the right steel for the job
A Storage Story
Robin King shares the lessons learned from his experience of workshop moves
A Simple Drill Grinding Aid
A newcomer to our hobby was having trouble sharpening drills, so Howard Lewis made a simple aid for him
Yet Another Bodge-Up!
Peter Shaw finds a use for some aged homebrew slot drills.
Workshop Press Tooling Part 2
Will Doggett makes a set of tooling for his press tool described starting in issue 285