Practice plaque.

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Practice plaque.

Postby Jim J » Sat Aug 05, 2017 6:26 am

Brass plaque hammer & chisels, copper inlay. Practice piece
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Yippie kit yay.
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Jim J
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Re: Practice plaque.

Postby Chris A » Sat Aug 05, 2017 8:33 am

I think you need to read the principle post at he top in this category; posting a picture without any explanation, thoughts etc makes it impossible to comment ; also the photo is so small, the work you have done cannot be seen.
'If I see further it is by standing on the shoulders of giants' - Newton
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Re: Practice plaque.

Postby Jim J » Sat Aug 05, 2017 1:08 pm

Yeah, you are right, I actually had written a more detailed comment about 3 times but kept losing it when it bounced.
I was just trying to get it to post, I had to resize it to upload.
Tired, frustrated with myself so I did the minimum of writing.
Kinda new to this incredible forum, still figuring it out.

Also, I need a better camera obviously.

Anyway, this is a thick brass plaque I had laying around for years wondering what to do with it.
I decided after carving the top left ribbon in wood a couple of times, to make it into a sample plaque for hammer and chisel work.
Probably a depth of 1/8 for the background cut away.
The other scrolls, trying some different styles, copper inlay, thin line engraving etc.
Mostly an exercise in chisel work but also a nice display piece on my table to show what can be done with different techniques.

Most of the chisels I make from Harbor fright :sneaky: 6" hex screwdriver bits.
I think I buy 10 for around $7
The steel is S2, fairly simple to heat treat and temper. Hold a decent edge in brass, available and cheap.
Others I made from broken, extended length taps because they are good high speed steel.
Different shapes, mostly rounded and flat edge in different sizes, scrapers etc.

Ill work on better pics and sizing in the future.
Thanks,
Jim
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Re: Practice plaque.

Postby Jim J » Sat Aug 05, 2017 1:19 pm

This was/is an ongoing project, the majority of the designs came from copies of antique scroll patterns.
Mostly an learning exercise in gaining hand skills with H&C.
Some of the early parts are crap, (lower right) others I'm pretty happy with, the copper background inlay taught me a lot and turned out okay.
I like the big ribbon design for the flow and curving surface.
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Re: Practice plaque.

Postby Albert R » Sat Aug 05, 2017 3:58 pm

Clever Jim!
HF Hex material in S2!

In case anyone else thinks it's a good idea too, here is the skinny on heat treat and tempering from AZO Materials:
Forging
Forging is carried out in S2 tool steels at temperatures ranging from 899 to 1093ºC (1650 to 2000ºF). Forging below 871ºC (1600ºF) is not preferred.
Heat Treatment
S2 tool steels are slowly preheated to 649ºC (1200ºF) and then directly heated by increasing the temperature to 871ºC (1600ºF). This is followed by holding the steels for 10 to 20 mins and quenching in brine or water.
Tempering
S2 tool steels are tempered at 177 to 427ºC (350 to 800ºF) to obtain Rockwell C hardness of 60 to 50.

Regards,
Albert
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Re: Practice plaque.

Postby Jim J » Sat Aug 05, 2017 10:22 pm

Thanks Albert,
S2 is more or less a medium carbon steel, with high shock resistance. Still can reach 60 Rockwell if done right.
I get a decent result with grinding to shape since most of my chisels are less than 1/4" wide ( 6mm ish for the metric Crowd)
Propane torch/one brick forge, slowly taking the material up to non-magnetic temp, soaking for a few and water quench.
Polish surface and Draw back to straw color.

Most heat treating calls for x time per inch of thickness.
With a small chisel the thickness versus time is pretty short.
Haven't had any trouble with cracking, holds a sharp edge pretty well.
Also only heating the cutting end, keeps the striking end tough.
If I was doing a bunch at one time I'd use my electric furnace and heat treat foil.
Then draw the back end softer with a torch.

This is assuming that what they say is S2 actually is the same alloy as claimed. :smartass:
It does seem to at least be close enough for h&c.
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