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Member postings for Eric Cox

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

Thread: Rack locomotive of 1812
25/01/2010 09:03:36
The end is turned down for the 6BA thread but from a 3mm Dia. bar, so where does the 5.5mm come from.
Thread: Speed and feed rate for 1 1/4" Carbide Index tool?
23/01/2010 11:13:07
Look at these for info on speeds and feeds
 Oh, by the way circlip, weld the machine to a metal table, bolt table to a concrete plinth. QED.

Edited By Eric Cox on 23/01/2010 11:22:00

Thread: Rack locomotive of 1812
23/01/2010 10:04:35
The drawing and photograph of part 33 (piston rod) shows the rod being 3mm dia. with a 5.5mm dia lip. The text says the end should be turned down to form a shoulder. Which is correct.
Thread: Speed and feed rate for 1 1/4" Carbide Index tool?
22/01/2010 10:29:17
Low carbon steel has a cutting speed of approx.300 fpm. dependent on hardness with a carbide cutter .
 rpm = (fpm * constant)/cutter dia.
 = (300*4)/1.125 = 1066 rpm
21/01/2010 09:21:42
What material are you cutting ?
Thread: Tongue in cheek
16/01/2010 09:43:06
In a recent edition of ME the contributor stated that his drawing would be dimensioned in Imperial inches. This came somewhat of a relief as I've always found Metric inches difficult to work with
Thread: lathe tool advice
22/12/2009 09:54:06
Why use an angle grinder on something as small as 3/8" Dia. The heat generated would have an adverse effect on the material. Next time use a file or cut a blank with a hacksaw 7/16" or 1/2" square and turn to round.
Thread: Water cut wheels
29/11/2009 09:27:57
In the latest edition, Anthony Mount uses water cut wheels for the rack engine.
 1) where would I find a company able to do this
 2) what would be an average cost for such a small quantity ie one or two items
 3) what would have to be given to the company in the way of drawings for the components t be cut
Thread: Beginners start here in Model Engineer
19/11/2009 11:50:26
As you say, the trouble of writing an article is knowing what level to set it at. However, you seem to have fallen into the trap of most writers by introducing a technical term and assuming the reader is familiar with it. I refer to the "wobbler", a term I had not come across till I read ME. even though I have been in engineering for over 30 years. So, how did I find the edge without one?, by using a half inch ground dowel and a cigarette paper.  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.
With regards the setting out of the holes in the base plate, a more logical order would be A B C D L I J K then G E F H as with would reduce the amount of to-ing and fro-ing  from the datum origins but then it's each to their own.
Thread: Small Drills
15/11/2009 10:16:07
Have a look at these two web sites.
Thread: Cutting male threads
13/11/2009 11:46:30
No, it's not at all daft. The dies we use cut into the metal and form the thread by removing material. Thread rolling uses a hardened die which is pushed into the metal and the thread profile is transfered onto the work piece. It means there are no sharp edges on the thread at the peak or the trough and less chance of stress points being created thus leading to a stronger thread.
Thread: Compressed air on lathe
06/11/2009 09:17:14
When I worked in the food industry the filling machines had a 3 foot diameter PTFE seal that had to be lapped in. To achieve this the machine was run without lubrication on the seal. We used compressed air at 80 PSI to help cooling so a few pounds on a lathe wouldn't have much effect. I would never combine swarf with compressed air because at some point eyes would enter the equation.
Thread: B & Q Steel stock
31/10/2009 11:54:54
Yes, it's the new one in Wellington Rd. You'll find the steel in the hardware section.
30/10/2009 11:22:02
A new B & Q Superstore has opened near me in Burton on Trent. Looking round I was surprised at the steel stock that was carried. As well as normal bar, various sections are available in steel, brass and aluminium as well as threaded bar and sheet steel. Various lengths are carried from 1M to 2,5 M. Definately worth looking at if you have a Superstore near you.
Thread: Visiting UK
24/10/2009 12:16:35
For accommodation try the following, ideal if you're touring.
24/10/2009 11:35:48
There is also
24/10/2009 11:32:56
This museum in Derbyshire is well worth a visit
Thread: Depth of cut
18/10/2009 10:27:47
On an industrial vertical milling machine, depth of cut is obtained by raising the table a few thou if necessary. On the smaller milling machines used in model engineering the  table is fixed so the head must be lowered. Can the head be lowered with the same degree of accuracy.
Thread: Humidty
11/10/2009 11:04:54
A retro-fit controller can be found here
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