Processes

Use of Magnetic Chucks for Milling and Turning

by

Neil Wyatt

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24 July 2014

Interestingly they avocate climb milling over normal milling, where the machine is capable of this, as the forces tend to press the work down onto the chuck. In general the use of stops and jigs is advocated to ensure work cannot easily be dislodged. Take note that when it is desired to mill around the…
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Mini Lathe Changewheel Tables

by

Neil Wyatt

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27 June 2014

As published, the tables were for lathes with 16 t.p.i. and 1.5mm pitch leadscrews, as that covers the majority of mini-lathes. Some mini-lathes have 2mm pitch leadscrews, and extra tables for such lathes are included here. Note that these are not necessarily practical in all cases, and a few variations have been found that work…
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Screw Thread Measurement Utility

by

Neil Wyatt

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18 June 2014

The three wire method gives very accurate figures for the truesize of screw threads by measuring from the flanks of the V rather than from the crest of the threads. As the crest are normally truncated, measuring across them gives a false reading. The problem with the three-wire approach is the complex trigniometry involved! This…
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Cutting Speeds Table for Teach In 2014

by

Neil Wyatt

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9 May 2014

There were two minor errors in the cutting speed table in David Clark's Teach In article in issue 216 of Model Engineer's Workshop, caused by errrors in the spreadsheet. As this is such a useful chart, a pdf copy is reproduced here, which can be printed out and stuck up in the workshop. www.model-engineer.co.uk/…/documents/cutting speed…
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Simple Gearing for Metric Threads on Myford ML7 lathes with gearboxes

by

Neil Wyatt

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30 March 2014

Unfortunately a number of errors crept in to the large and complex gear tables in the artilce. Brian has now checked each gear combination individually, and prepared a corrected PDF version, one table to a page, which can be downloaded HERE. The individual pages can be printed off and laminated to give a handy workshop…
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CNC Milling with MACH 3 – Part 3

by

Richmond

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3 June 2009

This time, lets do something useful to demonstrate the power of a simple CNC program. The first program is the test program used in the review of the KX1 in Trade Counter. All it does is mill a groove in a bar and then it drills holes along the bar using a simple repeat command.…
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CNC milling with MACH3 – Part 5

by

Richmond

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3 June 2009

One of the main uses of CNC machines is the production of complex profiles. Profiles can often be programmed and milled faster than you can set up a rotary table. Once you have had a little bit of practice at programming, even one offs become quick and easy. In the Practical Engineer article on page…
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CNC milling with MACH3 – Part 4

by

Richmond

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3 June 2009

This month, we move onto simple profiling starting with the G12 and G13 circle cutting cycle and continue with straight cuts using the G41 offset left command. This is quite a long program as it cuts five holes and then cuts the profile. In future articles, unless very short, I will limit the program to…
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The practical engineer – part 5

by

Richmond

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1 June 2009

I am not yet retired (that hopefully is a long way off yet) but I have been buying tools and kits most of my life and now have a reasonably well equipped workshop, apart from the occasional tap and die or small tool. Prior to becoming editor of Model Engineers’ Workshop, I spent most of…
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CNC Milling with MACH 3 – Part 2

by

Richmond

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15 May 2009

Last time, we learnt how to set a datum in the X & Y planes using G54. I have had an email about this saying that most readers would find it easier to just set the machine coordinates and the G54 to Zero. This is especially true when the machine does not have homing switches.…
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