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Low Earth Orbit
DIY Audio
Knockout Punches on 1/8” aluminum plate
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<blockquote data-quote="Geoff Doane" data-source="post: 213650" data-attributes="member: 1155"><p>I've probably punched hundreds of 15/16" holes in 1/8" aluminum and lived to tell the tale. Clamp the plate securely in a vise (horizontally) and don't try to go too fast, seems to be the secret. If you use a big wrench, it's easier, but also possible to get the punch extremely hot. I think that may be what trashes the threads. When I have broken punches, it's always the bolt that breaks, and that was from cutting an uneven holes and the bolt bent before it snapped.</p><p></p><p>Unfortunately, I don't know what grade of aluminum I was using. I've just gone to my local sheet metal shop and asked them to cut the sizes I need. It takes seconds on their big shears.</p><p></p><p>If you don't need smooth edges (the connector will hide the cut edge), a hole saw is much quicker. A drill press is a good idea, and hearing protection is mandatory.</p><p></p><p>GTD</p></blockquote><p></p>
[QUOTE="Geoff Doane, post: 213650, member: 1155"] I've probably punched hundreds of 15/16" holes in 1/8" aluminum and lived to tell the tale. Clamp the plate securely in a vise (horizontally) and don't try to go too fast, seems to be the secret. If you use a big wrench, it's easier, but also possible to get the punch extremely hot. I think that may be what trashes the threads. When I have broken punches, it's always the bolt that breaks, and that was from cutting an uneven holes and the bolt bent before it snapped. Unfortunately, I don't know what grade of aluminum I was using. I've just gone to my local sheet metal shop and asked them to cut the sizes I need. It takes seconds on their big shears. If you don't need smooth edges (the connector will hide the cut edge), a hole saw is much quicker. A drill press is a good idea, and hearing protection is mandatory. GTD [/QUOTE]
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Knockout Punches on 1/8” aluminum plate
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