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|
Alan , thanks for your further comments.
Your suggestion of using EVOSTIK chimes with Keith Longs, this I will try.
I'll post result in a number of days (procure and mature time).
Thanks for your comments.
Chris-, I am also a cheapskate having performed most of the actions you describe, and under similar circumstances.
I have not tried superglue,my attempts were with Araldite but all on lap joints.
Alan- I have a Makita belt file and also have had no problem with belt failures, having just checked all the belts are lap jointed. The B&D belts are both lap jointed and taped. All the failed belts are taped joints also the grit is coarse (40). The lesson I think is that coarse grit should be lap jointed.
A final thought , I would like to have caused the failure by overloading a worn belt!
The remaining question is; any thoughts out there for an adhesive to repair the failed belts or a source of the tape.
Keith, Many thanks for your response. I should have stated in my original post that the belts are joined by an adhesive strip across the back of the splice. This form of construction does not seem to define a direction of run. The join appears to be held by some form of heat activated adhesive.
I will try the suggested internet search and if I find a solution (ha-ha) i will post it, I can't believe that I am the only person suffering this problem.
Again thanks Paul.
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|
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.
Hi, it is in the climax book. Have the book, cut the gears, very satisfying.
Can I help?
|Thread: Very early locomotive boiler feeds|
sorry about the above posting ,I didn't type it like that !
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.
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.
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?|
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.!
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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