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Member postings for Terryd

Here is a list of all the postings Terryd has made in our forums. Click on a thread name to jump to the thread.

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Thread: What type of oil to use on a Milling machine
16/01/2010 14:06:47
In addition to my last post.  I should also have said that I wipe the bare metal of the machines with a paper towel and a  little light oil when I leave it (after cleaning) and wipe over before using with a clean one.  Also I make sure that there is never any swarf left, especially ferrous.
 
As an afterthought, would a sacrificial block (eg. zinc), such as is used on ferrous hulled boats, help if bolted to a machine?  Perhaps someone more knowledgeable than me could help to answer that.
 
I also remember that the Arc Eurotrade product I mentioned is called 'Restore Rust Remover'.
16/01/2010 13:49:54
I'm a bit dubious about using a textile cover such as cotton.  Cotton especially is well known for moisture absorption  Surely if your workshop is damp, textiles will absorb moisture and retain it, keeping it in contact with the metal of the machine for longer?
 
I have a rather damp unheated large garage in which I use part of as a workshop.  I actually use a product sold by Arc Eurotrade as a coating but my main weapon is to use a loosely fitting polythene cover over each machine and I have very little problem with rust.  Even using just the polythene covers previously I have had little problem. I found that the moisture in the air seemed to fall down onto the machine (a bit like rain) and and the covers prevent this.
 
On my milling machine I kept the large poly bag it came in and actually use that, on the Boxford I simply drape over a poly sheet .  It seems to work.  Hand tools etc are kept in cupboards and drawers and don't have a problem with rust.
 
By the way, Arc Eurotrade (usual disclaimers here) sell a very good rust remover for use with hand tools  and small components, which removes rust and forms a protective coating and seems to work incredibly well.  Not sure of the name but it's in their catalogue.
Thread: Brass Shell Case
16/01/2010 11:31:18
As Gordon Says, the accepted definition of 'Acronym' is a pronouncable word made up from initial letters of a phrase eg. Laser (light amplification by stimulated emission of radiation) .  Abbreviations on the other hand are simply initial letter of a phrase eg iirc, lol or imho (although the opinion is never 'humble' and this last abbreviation should never be used imo!). Not too sure about BSA though.
 
Most modern abbreviations developed due to sms (short messaging system) otherwise known as texting, because of the limitation to 256 characters (I think, although I stand to be corrected).
Thread: Beginners start here in Model Engineer
29/12/2009 08:09:24
Posted by Eric Cox on 19/11/2009 11:50:26:
 Lightly trap the paper between the dowel and the work piece then move the table half the diameter of the dowel + the thickness of the paper. A dowel and a packet of cigarette papers is a lot cheaper than purchasing a Wobbler.

 A centre finding 'wobbler' or sticky pin, can be as simple as a lump of plasticine or Blu-Tak stuck to the machine with a small pin embedded in it even cheaper than a pack of cigarette papers and dowel.  See Mr G Thomas' book for a full description of how his foreman used to do it, a fascinating read.  'Workshop Techniques is available for loan from most libraries, and if not it should be, have a stern word with your librarian!

29/12/2009 07:59:24
Posted by meyrick griffith-jones on 19/11/2009 18:04:57:
 
Perhaps for those who have a difficulty with any of the technical terms we could have a forum, and then anyone who needs to know can ask and one can make reference to it in the header for the article.   

 Sorry Meyrick but did you not notice the title of this thread.  This is the place for such questions surely?

Thread: Grub screw has turned to cheese!
29/12/2009 07:49:54
Just a couple of points,  Grub screws are indeed available from local fastener or engineering suppliers and are in fact called 'grub screws'.  I buy them for projects from a small company locally and they are as cheap as chips.  Set screws are are not another name for grub screws but simply bolts, such as hex head which are threaded all the way up to the head, rather than a short thread on a longer shank as on a 'bolt'.  They all come in socket screw form these days it seems.

Using copaslip is a good solution to the problem of them sticking,  Don't use oil, the screw may vibrate loose.  A small tube will last for years if used for it's purpose.  A good substitute believe it or not is soap.  Wipe the screw on s piece of wet soap before fitting.  That also prevents woodscrews from sticking by the way for those DIY ers out there.

A precautionary tale.  I bought an ex school Boxford lathe, in rather good condition as it had little use, a bit bashed but little wear where it counted.  However I noticed that the main drive pulley (10 inch dia) was distorted and not running true.  When questioned, the workshop technician told me that they had to remove the pulley for maintenance in the past and although they had removed the retaining grub screw it would not shift off the shaft no matter what.  he claimed that it 'must have welded itself onto the shaft'.  Eventually they resorted to a hide mallet, hence the distortion. 
 
What they had not known is that Boxford, like many other companies in the past used two grub screws in each pulley boss, one on top of the other.  The first one locks the the pulley to the shaft and the second is locked down on top to prevent the first from vibrating loose. Much in the same way that a locknut is used on a screw thread.   So, after removing a grub screw always check that there is not another little bugger hiding down there to cause trouble.  Before reaching for the biggest mallet you can find by the way.
Thread: Beginners start here in Model Engineer
28/12/2009 23:49:48
oops, Sorry about the double posting,
28/12/2009 23:48:50
Posted by Chris on 18/11/2009 19:17:35:
.
Many starters who are younger than myself will have had no metalwork at school as the health and safety lot got rid of machine tools from schools about 20 years ago
 
 
I taught metalwork in school until around 10 years ago an can assure you that there are still some schools which have retained some machinery such as milling machines and lathes for student use even now.  In fact on a temporary contract two years ago (I've been retired for several years now) I was teaching youngsters how to use Boxford lathes and milling machines for their projects. We also had simple CNC millers and lathes, again Boxford.
 
The abandonment of school metalwork had nothing at all to do with "the health and safety lot" I can assure you.  Stop blaming them for everything.  There are two main reasons why it was abandoned. 
 
Firstly because of a National Curriculum (and the subsequent examination syllabuses), insisted on by a certain M Thatcher, that stifled practical subjects because she saw no need for manufacturing industry in a 'Service Economy'.  and Secondly because of the lack of sufficiently skilled and knowledgeable teachers, due to fundamental changes in training methods.  I and many of my teaching colleagues were ex engineers who retrained, when we retired there was simply no-one to replace us.  Nothing to do with H&S.
28/12/2009 23:48:48
Posted by Chris on 18/11/2009 19:17:35:
.
Many starters who are younger than myself will have had no metalwork at school as the health and safety lot got rid of machine tools from schools about 20 years ago
 
 
I taught metalwork in school until around 10 years ago an can assure you that there are still some schools which have retained some machinery such as milling machines and lathes for student use even now.  In fact on a temporary contract two years ago (I've been retired for several years now) I was teaching youngsters how to use Boxford lathes and milling machines for their projects. We also had simple CNC millers and lathes, again Boxford.
 
The abandonment of school metalwork had nothing at all to do with "the health and safety lot" I can assure you.  Stop blaming them for everything.  There are two main reasons why it was abandoned. 
 
Firstly because of a National Curriculum (and the subsequent examination syllabuses), insisted on by a certain M Thatcher, that stifled practical subjects because she saw no need for manufacturing industry in a 'Service Economy'.  and Secondly because of the lack of sufficiently skilled and knowledgeable teachers, due to fundamental changes in training methods.  I and many of my teaching colleagues were ex engineers who retrained, when we retired there was simply no-one to replace us.  Nothing to do with H&S.
Thread: Taper screw
15/11/2009 13:57:33
Just a bit of information. A traditional woodscrew does not taper.  The crest of the threads are parallel, it is the core that tapers.
 
TD
Thread: Metric vs Imperial - Practical or Traditional?
05/09/2009 17:12:52
Bricks Are metric.  215 x 65 x 102.5  (see BS 3921).  That gives a coordinating size in a wall of 225 x 75.  The latter dimension of 102.5 is not a conversion from imperial, but because the width of a brick has to coordinate with the length in certain bonds.  So two widths plus two mortar joints of 10 mm is equal to one full brick with one joint of 10 mm, i.e. 225mm.  Thus the bricks can coordinate.  If you doubt the difference between Metric and imperial bricks I suggest you try matching the two in a sectionof brickwork.  Also slabs ARE 300 x 600. 
 
As a mid 60 year old I am extremely happy with the metric system and prefer it.  \we can all find fault with all systems such as 'try dividing by three' just try multiplying fractional sizes without converting or dividing decimal imperial by three - no significant difference.  A serious problem with imperial measures is that they were not constant across the world, there were no agreed standards.  Try getting an English quart into an American quart pot. There are also many definitions of a mile, there is no standard.
 
Frank Hornby used imperial in the late 19th century when inventing Meccano, as one would expect but was specifying grammes (sic) for his weighing experiments.
 
Please could we also bury this insistence on blaming this vague concept of 'Europe' for metrication it was the British government who decided to adopt the more logical metric system well before 'Europe' was involved with such decisions.  It was made on the recommendation of British scientists, engineers and other interested parties who wanted to be rid of the haphazard, complex and illogical system that is the imperial one and use a simple straightforward system with one length measurement and one volumetric and weight measure.  ( the decimetre, hectolitre etc are made up measures and are not part of the ISO system).
 
By the way, we use the L as the basis of the pound sterling (£ because it is derived from a French denomination, the Livre, Our system of weights are based on a medieval French system Hence 'lbs' for pound and the avoirdupois ounce etc.  in fact it was the influence of European countries who gave us the Imperial system and they dumped it when a better system came along.  Another by the way, those who think that the inch was the width of Henry the Eighths thumb, just remember he was a Tudor - Welsh / Normans.
<< First < Prev 91 92 93 94 95 96
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