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Cattle Boards
Trucks, Tractors & Machinery
whats a good speed for drilling metal?
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<blockquote data-quote="Bama" data-source="post: 276201" data-attributes="member: 1184"><p>Speed & feed - thats two terms used in most metal shops. That ain't really two fast for a <strong>SHARP</strong> 5/16 bit. If the bit is sitting on a chip it ain't cutting and is heating up, use cutting fluid as mentioned before and you can even go much faster. The slower rpm's you are talking about are for much larger bits. A 5/16 don't really have to produce the nice little curls to cut well, just keep the chips cleared. The curls indicate that the speed and feed rate is about right. Smaller bits need faster speed, larger (3/4" and up) bits need slower speeds. Another problem is drilling into something that cant dissapate the heat. In this case you can set up a air nozzle to blow on the part to get rid of the heat. BTW I ain't a machinest, I just work with some really good ones.</p></blockquote><p></p>
[QUOTE="Bama, post: 276201, member: 1184"] Speed & feed - thats two terms used in most metal shops. That ain't really two fast for a [b]SHARP[/b] 5/16 bit. If the bit is sitting on a chip it ain't cutting and is heating up, use cutting fluid as mentioned before and you can even go much faster. The slower rpm's you are talking about are for much larger bits. A 5/16 don't really have to produce the nice little curls to cut well, just keep the chips cleared. The curls indicate that the speed and feed rate is about right. Smaller bits need faster speed, larger (3/4" and up) bits need slower speeds. Another problem is drilling into something that cant dissapate the heat. In this case you can set up a air nozzle to blow on the part to get rid of the heat. BTW I ain't a machinest, I just work with some really good ones. [/QUOTE]
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whats a good speed for drilling metal?
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