| The Shop > Metal Stuff |
| Why is my lid jig a miserable failure? |
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| Bolster:
This fellow who made the lid in the top photo appears to have made a heavy, all-at-once die, see the video at about :50. I don't have the ability to make one of those! And, I wanted an option that would allow me to make lids for various pots, by simply adjusting the distance between the pivot and the anvil. Looks like metal spinning would be my best bet, and I'm guessing there's no salvaging of the mill jig shown above. :palm: |
| Bolster:
Wait, here's a better video. The magic happens at around 7:00. That's a pricey, non-adjustable die. |
| S. Heslop:
You could maybe cut out an inside circle of a bit of hard wood with a hole saw, or a jigsaw (I like to hold my jigsaw upside down in a bench vise and use it like a rubbish scrollsaw), and glue that onto a bigger block of wood. You could then use the cut out hole to make the matching die. I'm not sure if you'd get enough pressure using your mill as a press when doing the whole thing, although it is thin aluminium. Maybe you could just put it on the floor and jump on it. Edit: In fact if you have a bench vise you could just use that as a press. |
| Bolster:
So...the recommendation is to make the rim all-at-once, rather than a little bit at a time, because the all-at-once die method stretches the metal less? Yes, I could see making a wooden jig with my router and one of those plastic circle jigs that attach to router bases. Feel rather foolish about all the time I spent making my nice aluminum mill jig, tho. I guess it's "practice." I should have known better about the metal stretching. :doh: Thanks for explaining it to me. |
| S. Heslop:
--- Quote from: Bolster on November 18, 2013, 11:14:18 PM ---So...the recommendation is to make the rim all-at-once, rather than a little bit at a time, because the all-at-once die method stretches the metal less? Yes, I could see making a wooden jig with my router and one of those plastic circle jigs that attach to router bases. Feel rather foolish about all the time I spent making my nice aluminum mill jig, tho. I guess it's "practice." I should have known better about the metal stretching. :doh: --- End quote --- You should see all the terrible jigs and fixtures i've built. It's rare when the first attempt works. |
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