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Member postings for Mike Gibbons

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

Thread: Case Hardening
05/03/2011 21:04:37
Hi Keith & Andy,
 
Thanks for the info', Peter Dyson looks ok at £10 a bottle and I'll send an email to Blackgates to see if they still stock it: pity you can't find out from their web-site.
 
Regards, Mike
03/03/2011 21:54:53
Thanks for your replies.
Chronos was my first stop - - - but £30 a tub!!
I know about packing the components into a box with carbon-rich material, but I don't have a good enough heat source to hold it at temperature for a relatively long time period. That's the trouble with being retired, at work I had access to a muffle furnace.
 
I seem to recall hearing about ferrocyanide, but has anybody bought it and used it - - are there any problems: I think the cyanide reference makes me a little cautious - - - I also had access to chemists at work.
Regards, Mike
03/03/2011 16:10:42
Hi All,
Can anybody help? I want to case harden a couple of small components, but Kasenite, the stuff I've always used to do this job, seems to have dissapeared into the "infinite" ( is it a case of "H & S" strikes yet again ? ).
I didn't have the forethought to stock-up a life-time supply.
 
The only alternative I can find to Kasenite comes in a £30 tub; I just don't want that much. So the question is: does anybody know of a supplier of small quantities of case hardening compound?
 
Regards, Mike.
Thread: 3 1/2" Jubilee
04/12/2010 17:25:15

  John,
 
            Thanks for the reply; I'll have a good look at that web site.
 
           As for the coning, I'll ponder on that a bit yet.
 
  Mike.
03/12/2010 22:06:52

I am just starting to build my first Loco', Martin Evans' 3 1/2" Jubilee, and I am having a few problems; because, although the detail drawings are excellent, there is no "General Assembly" drawing, so I am having some difficulty finding out where some of the parts go. At this stage the three 1/2" dia. frame stretchers.  But my main question is about the wheels. In his book Martin Evans gives precise details and dimensions for the coning of the tyre, the taper of the flanges and the various radi; but in his drawings of Jubilee there is no coning and the flanges are parallel. What is the normal practice for this scale ----- to cone or not to cone?
Thread: Tapered Blow Down Valve
07/01/2010 23:01:00
Hi Alan,
              I think you've answered the question yourself - - too much grinding.
Taper plug cocks are lapped - in; not ground. I have'nt done any small ones, but i've lapped in a few of the "big ones"; although it was 50+ years ago. From memory we used to finish up with Brasso. LBSC in his book "Shop, Shed and Road" states - - - "grind the cocks-plugs in with a scraping off your oil stone; just a few turns back and forth should be all that is needed".
 
Meyrick's advice will certainly work, it will be like making a new unit.
 
But if there is enough metal left try with Brasso, or even tooth paste. But when grinding or lapping in a valve or cock-plug, only turn the plug through 90 degrees or so, never turn a complete circle. After a few turns in one place reposition the plug and start again.
 
regards    
Mike
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