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Member postings for Paul White 3

Here is a list of all the postings Paul White 3 has made in our forums. Click on a thread name to jump to the thread.

Thread: powerfile bands
26/06/2010 10:39:36
Hello all,   I use and have found the  Black & Decker  powerfile to be a most usefull tool. However a major problem exists with the use of this item,( for me anyway) ,  the failure of the abrasive band joints. As yet I have failed to wear one out ,they are failing at the joint in very short time . Has any body a satisfactory repair that can be shared?  Or any other comment.
Many thanks.  Paul.
Thread: Cutting Bevel Gears
25/04/2010 10:42:24
The other matter I meant to mention is the article on cutting constant depth bevel gears that apeared in model engineer  15Nov 64 , this should help.
25/04/2010 10:05:33
Hi, it is in the climax book. Have the book, cut the gears, very satisfying. 
Can I help?
Thread: Very early locomotive boiler feeds
13/04/2010 09:59:05
sorry about the above posting ,I didn't type it like that !
13/04/2010 09:56:53
                Sorry no.  I thought that the impression came from information in "Ahrons" but
                having spent considerable time looking I can't find the reference.
                I still feel that a device with one input and one output with set piston operation
                can only be controlled by:-  1,  restriction of supply
                                                                  2, ability to hold open the feed- in valve
                                                             or 3, open outlet from cylinder to atmosphere to
                                                                      prevent a vacuum being formed.
12/04/2010 10:19:21
Jonathan,  If the valve" S "is for boiler feed, this would be a design for failure in the absence of  some form of bye pass or restiction in the feed water by producing the  hydraulic lock you mentioned in your earlier post !  Or am I missing something.  You may have found the earliest use of feed water control.  Pumps of this time had what looks like a valve lift control.
11/04/2010 15:29:51
hi, a very interesting project .  Could the answer to your question be  a simple valve in the supply line that  controls water into the pump?
Thread: How many boiler tubes?
09/12/2009 10:42:52
Weary, many thanks for your input responding to my post.
Apart from Kozo's comments, an interesting set of results on the matter of boiler heat transfer, as I am sure you know, were produced by Jim Ewins and are published in the back of Evans boiler construction book.  It was the reading of these findings that got me started on seeking a" better mousetrap" Kozo's designs and the article on "Peverill" in 5" gauge with the single tube boiler, both fed my search for something new.
I think that 50 plus years  of no real movement in model boiler design is plenty, not just for efficiency  reasons but also ease of construction. " Model engineers" used to be regarded with " experimental" engineers.!
08/12/2009 10:45:25
If I may add a slightly divergent comment to this interesting thread (interesting to me anyway).  Over the last few years there have been some very good articles in Model Engineer of an  experimental  nature using the modern stress analysis systems.
Aspects of the work relating to model boilers include the fact that some 80% of heat transfer that takes place, does so in the firebox (this has been claimed in past but confirmed latterly), another significant finding is the concentration of stress around and between stays.  To apply these two "findings" to model boilers is what has been done by Kozo in his design  of boilers on the,  Switcher, and Shay.
This development in design is, I believe, to be embraced, particularly as it reduces copper and silver solder cost, and eases manufacture.  Improved superheater possabilities also come with the different approach (see the article on a single flue boiler fitted to an Isle of Man loco used for passenger hauling).
Use of these latter findings must  move our modelling foreward, won't  it?
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