SE JT-SP321-5STR Disc Cutter with 5 Star Punches Set, 12 to 28mm
- 5 assorted size Star punches
- 12 - 28mm punches
- Cuts up to 20 gauge (1mm) soft metals
- 50-55 HRC hardness
- Made in India
-Handle functionality to help press and secure thin sheet metal in place for easy punching.
-Easy to use. Just slide thin-gauge metal sheet between die plates at desired size. Insert cutter into die hole - firm hammer tap produces clean disc.
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User tips: 1) USE BABY OIL. Every time, all over the plug. It makes a huge difference. 2) For ~22 ga copper/silver/~24 ga bronze/brass or thicker, ANNEAL FIRST (torch fire). The metal will fight you much less. 3) The first few times at least, you might want to draw a circle on your metal, so that looking down through the hole you can see whether your metal is centered. I still do this with the silver given how expensive it is. 4) Use a HEAVY BRASS HAMMER to punch through the plug. A steel hammer will work harden the plug, shortening its' life, and a rawhide mallet just doesn't hit hard enough. A two pound brass hammer bought at the hardware store for $12 works perfectly for punching through the plug in one try. The rawhide mallet took multiple tries, leading to scarring and warping on the metal. 4) Mark the tops of the plugs so that you know which end you can hit. 5) Do any texturing of the metal AFTER you have cut it out of the disc cutter. I tried rolling texture onto 30 ga copper and then punching out discs, and lost most of my texture. Punch first, roll/hammer/etch second.
Also the first few times you do this I'd suggest using a cheap metal (copper vs silver) and having two people. I dropped one of the plugs on the cement floor the first time, and I'm lucky it didn't mar the cutting edge.
It will cut you discs with a slight burr, but really pretty cleanly (after the first few cuts--no idea how good the metal it is made from is).
The only major complaint I have is the spacing in between. It is set at almost 1/8" which is huge when you are cutting gauge thickness metal. While you can pull out the screws, there are pins that appear to be pressed in. Meaning, you really can't pull these pieces apart and adjust the thickness.
I use a little wood shim to stabilize and cut lube.