Graham Meek recounts how he came to revise his design for the ML7 and gives advice on its making and use - Part 3
The basic dimensions of this bush for those who wish to order one are, 12 O/D, 8 I/D by 12 mm long. This could quite easily be turned from phosphor bronze, PB, but it will not have the porous nature of sintered bronze or the oil retaining properties. Therefore, an oil hole needs to be provided for the occasional squirt. Might I suggest a hole in the side of the main body extension rather than on the top where dirt and dust will congregate which will more than likely migrate into the bearing. Another Oilite bush is used at the rear of the main body for the operating shaft. This time the bush sizes are ½” O/D x 3/8” I/D x 5/16” long. This bush again can be manufactured from PB with a similar oiling arrangement. However, this bush needs to be fitted after the operating shaft is installed so any oil hole will need to be predrilled and lined up with the corresponding hole in the main body. It goes without saying that the ½” hole in the main body needs to be a reamed or bored hole in order for this bush to be a good fit. This bore also wants to be in-line with the opposite end and this can be achieved by gripping on the boss once this has been pressed into the main body. A good chuck is required for this operation. If the readers chuck is at all suspect then I would recommend using a 4-jaw chuck. Clocking the extension boss to ensure concentricity and then running the clock along the two sides of the main body to ensure these are parallel with the lathe centre-line.
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Denne historien er fra January 2018-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