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Member postings for Donald Mitchell

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

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Thread: ME 4407 - New Viewer
01/07/2011 09:05:32
Hi Engineers,
 
Amid all this moaning and whining about some dimensions missing in 4407 (most of which can be worked out by looking elsewhere on the drawings) nobody has yet mentioned the new viewer !!!
I would like to congratulate David and the ME team for changing to what looks like a very good viewer, at least in my opinion it's miles better, thanks guys.
 
Put down yer cups of tea and make some swarf.
 
Donald Mitchell
Castle Douglas
Bonnie Scotland.
Thread: Prams and teddies again
06/06/2011 11:42:13
Hi, as a self confessed CNC Luddite, I have been totally bored to death by the number of articles about G-Code etc. However, the last two posts to this list, by J.S. and Blowlamp, have made me pick my ears up considerably and I would very much like to read a "simple" introduction to setting up and running a CNC system in my workshop.
Who knows, I might even become a covert !!!
Donald Mitchell
Bonnie Scotland
Thread: A Challenge - How Would You Machine This Part?
02/06/2011 16:52:53
I'd use my grandpa's old hacksaw and finish the teeth off with a nice rat tailed file I bought in Woolworths about 30 years ago; I can work to about 2/10 of a thou with that file, who needs CNC
Donald
In Bonnie Scotland
Thread: Darjeeling Firehole Dimension in Backhead
15/04/2011 18:20:01
Peter Ravenscroft
 
Peter, I sent you a personal message from Ray McMahon on the 5th April, ........ have you checked your inbox recently?
 

Donald Mitchell
Castle Douglas
Bonnie Scotland

05/04/2011 16:55:54
Peter,
 
Yes, the blower valve spindle is 15.7/8" long, remember it goes all the way to the steam dome.

Donald Mitchell
Castle Douglas
Bonnie Scotland

Edited By Donald Mitchell on 05/04/2011 16:57:01

04/04/2011 22:29:12
Hi Engineers,
 
Raymond has spotted a mistake in the drawing on page 434 of ME issue 4401 concerning the firehole tube dimension.
 
The outside diameter of the firehole ring is correctly shown as 1.3/4" on the main view of the dummy backhead but on the side view to the right, the drawing shows the outside diameter to be 1.7/16"
 
The 1.7/16" dimension refers to the inside diameter of the firehole tube.
 

Donald Mitchell
Castle Douglas
Bonnie Scotland

 
 
 

Thread: Amateurs
24/03/2011 08:23:53
Hi Engineers,
 
I am Donald Mitchell, please don't associate me with Donald Whitman.
 
I have the same Christian name, and it seems I am also required to share my native Scotland with him; but in no way do I share his sentiments.
 

Donald Mitchell
Castle Douglas
Bonnie Scotland

Edited By Donald Mitchell on 24/03/2011 08:26:26

Edited By David Clark 1 on 25/03/2011 11:35:26

Thread: Darjeeling Eccentric Rod Dimension
20/02/2011 18:46:31
Hi Engineers,
 
Regretfully another misprint has been discovered, in ME 4398 pages 252 and 253 concerning the length, between centres, of the eccentric rods.
 
On the drawing on page 252 it is quoted as being 7 13/32" and in the text on page 253 it is given as 7 3/32"
 
I can confirm that the correct dimension is 7 13/32"
 
For Ray McMahon.
 

Donald Mitchell
Castle Douglas
Bonnie Scotland

 
Thread: darjeeling locomotive
11/02/2011 17:45:33
Hi Engineers,
 
I have just checked with Raymond and the radius of the expansion link slot is 5 11/16 Raymond has checked his master drawings (as supplied to ME) and the dimension is correctly shown on them.
 

Donald Mitchell
Castle Douglas
Bonnie Scotland

Thread: Screwcutting Die Specification
03/02/2011 21:56:53
Hi Engineers,
 
Can anyone tell me what the dimension should be for the three lock screw holes around the periphery of a 13/16" die, in terms of, how many degrees apart are the holes?
 
I have done a bit of a survey among the die holders which I presently have, ranging from the so called junk Chinese ones right through to Dormer and Presto ones and I find the screw holes range anywhere, as far as I can tell, from about 35 to 45 deg apart.
 
Is there an established "standard" dimension ?
 
I've checked various books, including Tubal Cain's workshop bible and can find nothing relevant.
 
I decided to make up a dozen or so tailstock die holders in order to leave dies permanently fitted and sized, instead of the constant pain in the butt resetting them as and when they needed changing.
 
I realise the dimension isn't too critical but I'd like to get it about right if possible.
 

Donald Mitchell
Castle Douglas
Bonnie Scotland

 

 

Thread: Darjeeling frames
16/01/2011 11:13:12
Nick,
 
Thank you for your explanation, all is now clear.
 
I had failed to remember that the page count returned to 1 when the new volume 205 started with issue 4381 in July 2010
 
Do the members of this forum agree with me, that it would be a good idea if contributors, when quoting a page number, would also add the issue number? - Especially when discussing something which appeared some issues previously.
 
I do also wish that some contributors would add a bit of punctuation to their posts, some are next to impossible to understand ! 
 

Donald Mitchell
Castle Douglas
Bonnie Scotland

15/01/2011 16:54:43
There isn't a drawing on page 618 - only four pictures of the cylinders.
and on page 625 there is stuff about the van Rennes engine ?
 
That is, unless you lot have a different M.E, issue number 4391 from the one I have. ?
 

Donald Mitchell
Castle Douglas
Bonnie Scotland

15/01/2011 15:15:00
Hi Millinghead,
 
I regret I am unable to understand your last post, made on the 13th January at 19.34
 
You say:- on page 618 - centre line of rear axlebox etc.,
On page 618 of my M.E., Raymond is dealing with the cylinders ?
 
and you further talk about:-
 
Chassis bracket on page 675 - on page 675 of my M.E., there are drawings of bits for a Maudsley engine ?

Confused !

Donald Mitchell
Castle Douglas
Bonnie Scotland


Thread: steam turbine and generator
13/01/2011 10:24:17
Hi Paul.
 
A steam turbine such as you might require has already been successfully designed and made by Raymond McMahon, from Stranraer, Scotland.
 
The turbine was described in ME sometime around 1 year ago and will be further described during the build of Raymonds Darjeeling B Class locomitive currently being serialised in ME.
 
I will try and find the relevant ME issue number this evening and report later. 
 

Donald Mitchell
Castle Douglas
Bonnie Scotland

Thread: darjeeling locomotive
13/01/2011 10:11:48
Peter & Dusty,
 
I have checked with Raymond on the phone this morning and he confirms that both the tank brackets, and obviously the cylinder mounting plates are on the outside of the frames.
 
He acknowledges that they are very close, but if accurately made to the published dimensions it will all fit.
 
Good luck, keep at it.
 

Donald Mitchell
Castle Douglas
Bonnie Scotland

Thread: Darjeeling frames
12/01/2011 23:31:20
Millinghead,
 
I take it from the tone of your mail that you are somewhat disgruntled by, and I quote, "the host of drawing errors, missing dimensions, (always the crucial one's)" you seem to have encountered in the B Class drawings.
 
As far as I am aware there have only been two errors printed, as already quoted by JasonB, 1. the dimension added by the ME draftsman incorrectly and 2. the similarly wrongly quoted thickness of the top spring leaf. Neither of these errors can be attributed to the designer, Raymond McMahon.
 
I am having some difficulty in understanding exactly what dimension you claim to be missing from the drawing, I quote from your mail:-
 
"at the rear of frame centre line ofrear axlebox to centre line of what i dont know,
I thought this was the centre of the shape at the top of the frame but visually
the (centre line) looks way off centre"
 
If you could clarify your query, I will take up the question on your behalf with Raymond and get the definative answer for you.
 
Raymond does not use the internet, I am in constant conversation with him and I have his authority to post to this forum on his behalf.
 
Raymond spent many months doing nothing but checking and double checking the drawings before giving the project to ME for publication, he is very nearly certain that there are no missing or wrong dimensions on the drawings - and most certainly not a "host"
 
I can advise that quite a few B Class engines are being made, a good number of them are right up to date with the series as it is being published. Very few problems are being reported, in fact only two so far. 
 
Please don't just bad-mouth the project; if you need some clarification on any point of the build, ask the question and I'll get an answer quickly from Raymond.
 
The finished B Class engine is a real beauty and it will be very well worth the effort.
 

Donald Mitchell
Castle Douglas
Bonnie Scotland

 
 

Thread: Using Butane
01/01/2011 10:55:36
Hi Engineers,
 
Perhaps newcomers to the list who are reading this particular discussion might like to look at a previous topic, discussed last January, entitled "Workshop Heating" in conjunction to this topic; this one seems to be heading in the same direction re. the burning of hydrocarbons.
 
Happy New Year to all.
 

Donald Mitchell
Castle Douglas
Bonnie Scotland

 
Thread: M.E. Magazine Delivey Issue 4394
30/12/2010 13:48:50
Hi Engineers,
 
M.E. 4394 arrived through the letterbox in Castle Douglas, South West Scotland, this moning, 30th December.
 
That's good delivery, no complaints from this Scotsman.
 
Happy New Year to all.

Thread: Darjeeling Port dimensions missing on drawing
24/12/2010 17:53:24
Hi,
 
the exact method of setting out the port face is explained on page 619 of ME issue 4391
The spacing between the ports is 5/32"
 
Happy Christmas to all.

D. Mitchell.
Thread: LBSC Locomotives
28/11/2010 23:07:13
Hi David,
 
I am sure I have a complete set of unused drawings for Virginia which I purchased from MAP in around 1978 or 79 ish.
 
I'll hunt them out tomorrow and get back to you asap.
 
Donald Mitchell
Castle Douglas
Bonnie Scotland.
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