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News Release from: Andy Pallitt | Subject: Machining practices
Edited by the Manufacturingtalk Editorial
Team on 22 August 2002
Losing tricks of the trade - prevent it
happening
Trainer and researcher, Andy Pallit, seeks details of 'useful tricks of the trade' from practising and retired skilled machinists and toolmakers to pass on to today's students.
Andy Pallitt wrote: As appointed trainer and researcher my task is to collect as much useful tricks of the trade that a turner, and toolmaker may find useful This is a tall order I agree, but when you think of all those highly skilled machinists about to retire and pass away from pure boredom, taking that valuable knowledge to the grave with them, it is no doubt, a crying shame
This article was originally published on Manufacturingtalk on 17 Mar 2004 at 8.00am (UK)
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I kindly request everyone out there to please send me anything that may assist a student to enhance his skills and to make him an asset to his employers in the future.
I have yet to find a book that can tell you how to take a broken stainless/steel stud out of a aluminium casting for example.
you have a chap that is sent out to a repair and when confronted with this problem, he's stumped because he never learn't how.
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Tricks used to turn accurate tapers etc.
I am sure you get the picture.
Is there anyone out there who will spend a little thought and to spread the request among others for a non profit, for the good of all, to create a database or set of documents which will at least reflect the thanks and recognition to the author.
Please give me some pointers in the right direction.
I am a turner machinist by trade, taught by my late father, a well trained british artisan and mech engineer.
The little tricks and techniques he taught me serve me well to this day, but like most things, these tricks are recalled only when the need arises.
Click here for Free Video!! http://www.gohip.com/free_video/ Ed Mike Page adds: An example was that of a specialist high pressure pneumatic unit manufacturer, which subcontracted out the machining of a valve block to a local machinist.
All went well, until suddenly failures of seals out in "the field" began occurring.
Upon visiting the subcontractor, the manufacturer discovered that the seal bore grooves were being CNC interpolation milled, instead of single-point tool bored as specified on the drawing.
"But we have always interpolation-milled these pieces," said the subcontractor.
They went out into the machine shop to find the job on a recently-installed CNC miller.
"Hold on," said the subcontractor, "We do not usually do it on this machine!" It turned out that the new machine had coarser interpolation software when compared with the older CNC miller used before.
Interpolation was coarse enough to produce a polygonal (exaggerated) circular groove - with out-of-tolerance points - enough to cause a seal failure.
Upon being asked to rectify the units with single-point boring, and do all future units the same way - it could not be done! No one in the machine shop knew how to manually set up a machine to do the groove-turning job!.
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