(Update Feb 26th, 9:15pm AEST)
Just completed the upload on a new TGT, all about the foundry Pyrometer - As it happens, its a very awkward tool to shoot because its so long and thin. I just barely squeeze it into this shot even with the camera perched up on the ceiling :)
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Update Feb 18th, 9:30pm AEST)
One episode is travelling along the interwebs to YT at present, and all going well, the other episode will begin uploading in the morning.
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(Update Feb 14th, 5:00pm AEST)
A close up of the final stage of case hardening, just before the first quench - I love cracking these things open. Today and tomorrow I'm working on the post production stuff for the next 2 Fragments videos - the animations, CAD shots, white balance etc - script and narration to follow.
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(Update Feb 12th, 9:00pm AEST)
On the home stretch for shooting these next 2 videos, and now at my favorite part: Assembly and testing
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(Update Feb 9th, 8:00pm AEST)
I spent the day filing the square drive holes for the new AM tool flywheels - I really like the contrast between the cast bronze surface finish and the turned surfaces.
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(Update Feb 7th, 6:00pm AEST)
Some mild steel that has been carburised and then hardened using the leather charcoal case hardening method that I used to harden the files. This is 1/8" mild steel stock that has been left long enough in the carbon pack to become entirely through hardened (30 mins in the pack at red temp), quenched, then red heated again to straighten out the rod, and requenched. As well as giving me a chance to straighten out the stock, I think the second heat treatment has also slightly improved the grain structure. The next Fragments video has now grown to become 2 separate videos.
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(Update Feb 4th, 2:30pm AEST)
Matthew Thomas asks below about casting round stock, and I mentioned in response that I also use the sprues and feeders where possible for round stock too - here is a short video to show you what I mean - it is a short section of the sprue (the bit where the metal feeds into the casting) from a casting made for the next fragments video, and it tapers from approx 13mm to approx 10mm. The taper is a bit hard to get a good grip in the chuck, but there's usually a position where an acceptable hold can be achieved. Then a light pass to turn a cylinder for a subsequent grip, reveals the beautiful fresh bronze underneath. This little section of stock will be used to make some small retaining rings for the Antikythera tool that I am making at the moment - Btw, thank you so much for your patience on this next video. I'm making a tool critical for explaining how the mechanism was made, and I completely misjudged the amount of work required to get it over the line. Had I realised that it was going to take this long to shoot, I probably would have planned it around some other videos - in any case, I'm progressing well and should be close to finishing over the next week or so.
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(Update Jan 28th, 9:15pm AEST)
Progress is being made, but wet season rains have meant that I'm way behind folks. I've been shooting bits and pieces for other videos, as well as the sections that I can record indoors for this next Fragments video (Short Video), but the next video drop is going to be quite late. Note to self: don't schedule the shoot of a video requiring a bunch of cast parts during the wet season! Looks like a break in the weather tomorrow - so I will have the furnace fired up at dawn...
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(Update Jan 23rd, 10:35am AEST)
Yesterday I received the peer review report on the paper I submitted for publication last year. The reviewer was happy for the paper to be published essentially as-is, but made some excellent criticisms and suggestions that will significantly improve the quality of the argument and the way the paper is received. (I was very fortunate to have such a pleasant and generous reviewer give such thoughtful and helpful advice). I have since made another observation that I think is also worth writing up, so I will now work on improving the argument for both ideas, with a view to resubmitting later this year. There is potential for both of the papers to essentially cross over, so I may end up rolling them all into the one paper, but I'll see how it pans out. Either way, I will keep you posted :)
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(Update Jan 21st, 12:00pm AEST)
What happens when you are a bit too lazy to replace a cracked carbon sheath on your pyrometer? Why you annihilate the probe of course! A running repair today, and a good excuse to cover the pyrometer construction in a TGT :)
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(Update Jan 18th, 6:00pm AEST)
More protoytyping and casting over the last few days - Its not often I get to see a nice big chunk of pure tin - (short video) 5.1kg from northernsmelters.com.au - This will all be used to make bronze alloy over the coming months.
Btw is it just me or does my mold look a little er... anxious?
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(Update Jan 15th, 7:00pm AEST)
Here's a finished casting for the prototype I'm working on at the moment - I'm not entirely sure that I've got the size of this flywheel correct for the tool, so I've had a few goes at getting the size right (still not there yet!) - Note the pouring basin and narrow sprue - This example is far from perfect, but I've learned the importance of this pouring basin/sprue/gating approach from watching the Olfoundryman on YT - He put me on to the books of John Campbell, a master foundryman and researcher in modern casting practice, who teaches exactly how it should be done - I very highly recommend this book in particular, it will completely transform the way you think about casting: https://www.amazon.com/Castings-Practice-Ten-Rules/dp/0750647914/
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Back from a short break with the family, and raring to go for 2018 - For those of you freezing in the Northern Hemisphere right now, this will warm you up :) (Short Video) I spent today prototyping a tool for the AM Fragments series. It has a large cast part which I had a go at making today using a bronze alloy often found in Antiquity (Cu:Sn:Pb/85:10:5) - Btw for those interested, still no word back regarding the technical article I submitted for publication last year. Its coming up on 4 months since it was sent off for peer review, so I'm not really sure what to make of the delay... I will keep you posted.
Boguslaw Smalec
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