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Kent, As a machinist you well understand the strength of materials, not everyone that I see posting on the Internet seems to be aware of these limits, you are very wise to restrict your hardening work to relatively low pressure calibers, I think that as we enter the 21st Century there are less...

44 Henry, You are spot on here with your words of caution, I did read in your enquiries within this section, of a person wanting to CC harden the barrels of a shotgun!!!! I can only think that would end in one of the major disasters of which you speak. The problem is that outside of Europe there...

Kent, That looks very nice, I notice you get the light coloured rings around the holes, that sets the blued screws off nicely, the colour you have achieved on both actions is a really nice balance, so many turn out to be very patchy in colour, but you have a very nice spread of colour, just like...

Kent Shootwell, That is an excellent job! Did you block the thin sections ? You have a very nice colour range on this, and that is somewhat of a lottery as you never know what colours will come out from the steel type and of course the way the quench water flows, what bone/wood charcoal ratio...

Hello Alex, I think you have got a really nice colour balance here with fantastic blues, and really nice red hues, it would be an interesting experiment to try this formular/heat cycle, on an object with different sections, I still find I have problems around the edges of holes, maybe I should...

This is a great way to make a rack and pinion, I have made these a number of times, the pitch circle seems to sort itself out and you can use a length of studding the same size as the tap for the driver.

While dragging cables through long holes for our cooker power supply, I have given this problem further thought, it seems that I am not the only one to come up with the idea of making this in two halves, given that it is in Aluminium, 1/8" Dia and 8" (or 24" ) long I can see this would be almost...

I think your best chance of success here will be to drill the hole first in oversize material, then machine the outside to the size you require, to drill a hole this long with any accuracy will hinge on luck rather than judgment, especially with home workshop machines.

Hello 44 Henry, I would imagine that the base cap plunging into the quench will cause some kind of cavitation giving an air/water quench to the part being CCH, a very interesting departure, and one which I will certainly try, I think that the range of colours obtained must be a product of very...

Well 44 Henry, That is fantastic! I am not normally a great fan of the intense blues, they look much too modern when used on an early English gun but in this application it looks really nice, I always block any thin section that I intend to quench, but I think a great deal on effort is required...

Well Henry, I reckon you have got just about the perfect English Sporting Gun colour there, I think the spread of colours is about as good as I have ever seen with none of the modern bright blues. Can you tell us what mix you used to achieve this ? I would be a very happy man if I could get...

Hello Henry, Do you find that the use of Barbeque charcoal in case hardening is acceptable, or is this a modern synthetic substitute for willow charcoal, also what size "lumps" do you break the charcoal into? I am sure the size must make a difference to the colours obtained, I am about to use a...