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Thread: Punching small copper discs
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14th Mar 2017, 05:36 PM #1Most Valued Member
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Punching small copper discs
The new project lathe is missing about 30 little copper discs that go underneath the setscrews all over machine so i need to make 30-40 4 and 6mm copper discs, will a good sharp wadding punch do the job or should i look to making myself a shim punch and die? any other ideas welcomed. they seem to be 1.25 mm thick on average. One can be seen in the below photo.
20170227_213407.jpg
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14th Mar 2017, 06:02 PM #2Philomath in training
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I think you will struggle with a wad punch.
Michael
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14th Mar 2017, 09:02 PM #3
I did a couple with a wad punch recently. Michael is right. I would not try it for 30. I used the wad punch after about the third one flipping off across the shed trying to cut it with snips. I still had to make about 4 or 5 with the punch to end up with 2.
Dean
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14th Mar 2017, 09:33 PM #4Most Valued Member
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I'd look at making a simple punch and die set to suit the sizes required. I've done similar, not punching discs but sheet metal handles, I used a 20 tonne garage press. Will put up a pic shortly.
KrynTo grow old is mandatory, growing up is optional.
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14th Mar 2017, 11:05 PM #5Most Valued Member
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Unfortunately, one of the main things im lacking here is a press, so I imagine im going to have to use percussive force, I do have a few things at my disposal that could be useful. There is a big pneumatic jigging table here which has 4 realllly big pneumatic rams, maybe 6" dia 8" stroke, they may be able to be used for this, though a little rough on the die. We shall see.
What is the most convenient way to put draught on the ejector hole, will a taper reamer be acceptable? or should i just make the punch long enough that it forces the disc all the way through, Ill try for some crappy ralph-cad asap.
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15th Mar 2017, 03:21 AM #6Most Valued Member
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Um I wonder if you could experiment with a hole saw
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15th Mar 2017, 04:22 AM #7
Hi Guys,
I've made little plastic discs for just this purpose, using a leather belt hole punch and the 1.25 mm thick plastic strapping as used around packaging. Works a treat and you can just drop one into the hole, or two if you need.Best Regards:
Baron J.
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15th Mar 2017, 08:02 AM #8Most Valued Member
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I would get copper rod, turn to size and part them off.
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15th Mar 2017, 08:08 AM #9Most Valued Member
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Or use brass....
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15th Mar 2017, 08:39 AM #10
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15th Mar 2017, 09:43 AM #11Most Valued Member
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Could you please post some photos of using a hole saw to make 4/6 mm disks in 1.25 mm sheet stock. I'd like to see that.
Is that a commercial punch/die set or one that's been made? It looks excellent and very useful. What thickness of materials can you reliably punch?
FWIW I've just hacksawed off brass slugs from solid rod and dropped them in the holes before running the steel fastener down. They would obviously be thicker than 1.25 mm, but only take a few seconds to saw off and there's so much thread available that 5 mm wasn't going to be missed.
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15th Mar 2017, 10:16 AM #12Most Valued Member
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A challenge . No hole in the middle right?
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15th Mar 2017, 01:24 PM #13
Pete,
it's a commercially produced Jewellery Disk Cutter. I bought it more than 30 years ago, and have used it VERY often.
It is used on non ferrous metals up to 2mm. I've used it to cut Platunum, gold, silver, brass, copper.
It starts at 12mm then 1.0mm steps to 9, then 0.5mm steps to 2.0.
Common scene is required .... I'd never put 2mm stuff in there under about 5mm.
Most of what I use it for is around 0.5 - 1.5mm thick yellow and white golds...and that is where it excels.
Here is another option I've used sometimes for light weight non-ferrous metal stamping.
The "R T Blanking System"
You can see what I've used, imagine how it would go if a better steel was used!
Cheers,
Peter
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15th Mar 2017, 02:17 PM #14China
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15th Mar 2017, 09:23 PM #15
Hi Peter,
I've seen that technique used before. If I recall it was used for making steam whistle reeds.Best Regards:
Baron J.
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