It's a preliminary design, but maybe we could consider integrating the anvil by purchasing a steel disc.
Ideally, the lower part should be made entirely of metal (in principle, if you have the tools and skills, not necessarily yours, but the craftsmen’s, you can carve it from an iron blank or melt a mold from fusible metals, such as tin or lead
*, if ot don't turn out to be too soft to impacts hammer), then an anvil is not necessary.
* -
can melt a mold even from non-ferrous metals (brass, bronze), but it will be more difficult due to high melting temperatures.Have you already tested this wonderful device? Will the lower part under the puck begin to collapse from impacts? Keep in mind that stainless steel washers (as opposed to aluminum) have a fairly high hardness (approximately 353 MPa) and the applied force must be at a high level in order for the text to print well.
Thanks for the feedback mate, you are totally right about the hard surface at the base, in fact I had quite a few problems with this. Currently, I am working on two options.
The first one, which I called BitJig, has a steel disc glued inside, and also a nut on the base, so all contact is metal-metal-metal (washer-disc-nut). The first prototypes did break, but I made many improvements over time, and now they don't. You can check the other video I posted:
https://www.youtube.com/watch?v=SWVvvpQr304The first prototypes did break because I was placing them on a relatively "soft" surface, like a carpet, or things like that, to reduce the noise, but that should not be done at all! because the base might break. The latest units work quite well, I have reused some of them for around 10 seedphrases sets (I gift many to friends and family), and they do not show any sign of rupture. I do place them on top of a hard surface when engraving the words, such as a concrete or ceramic floor (even on top of a hard kitchen plastic board). Note that in the video, I only hit each letter once, and the jig was on top of a blue mat which is relatively soft (but it looked great on camera
), when engraving the words on top of a hard surface, the results are better. Also hitting each letter hard twice engraves them deeper.
These would be the BitJIg and BitJig mini renders (there are some pics in the previous pages):
The second approach, which is the one I am working on, is to release a free model (the one from these recent pictures). This jig would be easier to grab than the blockmit (the original one you can find online, it is not bad, but I did not like it much when I used it, so I designed my own ones), and easier to stamp, but less complex, so anybody with a 3D-printer could try it. With regards to this one, I was thinking about gluing a thick steel disc at the base, of 5cm diameter approximately, but I am not sure if that extra complexity is worth it, the blockmit is used with an anvil so I guess it might not be necessary... This one cannot fix the washer as the BitJig does, as it would lack the "grabbing mechanism".
Also in the future I might substitute the BitJig base by a CNC'd one, I have some prototypes already, but we'll see, step by step