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#11
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Thanks for posts. Just starting out . Have some manuals but none with
this information. What would be the gold standard of reference manuals for this information. Had wanted to buy a drill for mostly #30 and 40 drill bits but was at a loss with all the rpm ranges. Sounds like for aluminum I should be looking at a higher rpm range than I originally thought. I had thought this group was amoung other things to use members as a resource. I suppose I shouldn't be suprised that someone should criticize me for asking what to some might be obvious, but I don't think this is a community that eats its young. I might need some more help in the future. KM |
#12
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"Ded Dog" wrote in message om... Thanks for posts. Just starting out . Have some manuals but none with this information. What would be the gold standard of reference manuals for this information. Had wanted to buy a drill for mostly #30 and 40 drill bits but was at a loss with all the rpm ranges. Sounds like for aluminum I should be looking at a higher rpm range than I originally thought. I had thought this group was amoung other things to use members as a resource. I suppose I shouldn't be suprised that someone should criticize me for asking what to some might be obvious, but I don't think this is a community that eats its young. I might need some more help in the future. KM They don't seem to eat the young, they just chew on them for a while.... |
#13
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On 21 Nov 2003 03:04 PM, Ded Dog posted the following:
Thanks for posts. Just starting out . Have some manuals but none with this information. What would be the gold standard of reference manuals for this information. Had wanted to buy a drill for mostly #30 and 40 drill bits but was at a loss with all the rpm ranges. Sounds like for aluminum I should be looking at a higher rpm range than I originally thought. I had thought this group was amoung other things to use members as a resource. I suppose I shouldn't be suprised that someone should criticize me for asking what to some might be obvious, but I don't think this is a community that eats its young. I might need some more help in the future. KM A brief Google search came up with the following info related to drill speeds: http://www.micoks.net/~dbennett/dpsc.html A Palm application http://www.collinsclubs.com/woodwork...speedchart.pdf A PDF chart, not totally useful since it only goes as high as 3000 rpm ( meant for drill presses) http://www.auto-ware.com/techref/drillspeed.htm A simple chart which only has fractional sizes by sixteenths. http://209.92.149.105/keo/faq.asp Scroll down to the bottom for information which will allow you to calculate RPM and feed rates for amy material and any bit size. ---------------------------------------------------- Del Rawlins- Remove _kills_spammers_ to reply via email. Unofficial Bearhawk FAQ website: http://www.rawlinsbrothers.org/bhfaq/ |
#14
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"Ded Dog" wrote in message
I don't think this is a community that eats its young. I might need some more help in the future. KM Eat its young? Heavens no! That would imply some finality... around here the fun just keeps going and going and going! =D Eric |
#15
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I don't know which project you are working on, is there a group on line
like wise interested? If so that would probably be an excellent resoure to take advantage or. |
#16
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"Morgans" wrote: There is a wealth of knowledge here, and even more people who don't know jack, who purport that they do. +++++++++++++++++++++++++++++++++++++++ No problem. It's all here.... http://home.pacbell.net/diana_do/knowjack.htm Barnyard BOb -- knows his Schitt |
#17
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"Ded Dog" wrote in message om... Thanks for posts. Just starting out . Have some manuals but none with this information. What would be the gold standard of reference manuals for this information. Had wanted to buy a drill for mostly #30 and 40 drill bits but was at a loss with all the rpm ranges. Sounds like for aluminum I should be looking at a higher rpm range than I originally thought. I had thought this group was amoung other things to use members as a resource. I suppose I shouldn't be suprised that someone should criticize me for asking what to some might be obvious, but I don't think this is a community that eats its young. I might need some more help in the future. KM Get a thick skin, if you want to stick around here. We do eat our young sometimes, and almost always eat newcomers. :-) There is a wealth of knowledge here, and even more people who don't know jack, who purport that they do. The trick is telling them apart. The best things to do, are to get some good books, and read them. Others are better at giving these lists than me. Also get with an EAA tec adviser, and get together often. -- Jim in NC |
#18
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#20
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(Ded Dog) wrote: what rpm range best for aluminum sheet metal? 2600? 3600? less? more? thanks KM Let's widen the scope to include other materials. RPM = 3.8*CS/Dia where CS is the cutting speed in ft/min and Dia is drill diameter in inches. Page 8 of this Cooper Power Tools catalog http://tinyurl.com/w8wi (a pdf file) lists recommended cutting speeds for various materials. There is also an RPM table based on those cutting speeds for high speed drill bits from 1/16 to 3/4 inch. Here are the recommended cutting speeds, Material Cutting Speed (ft/min) Stainless Steel 30-40 Forged Steel 40-50 High Nickel Steel or Monel 40-50 Titanium Alloy Sheet 50-60 High Carbon Steel 70-80 Malleable Iron 80-90 Mild Steel 80-110 Mild Steel Sheet 80-110 Medium Hard Cast Iron 70-100 Soft Cast Iron 100-150 Plastic and Bakelite 100-150 High Tensile Bronze 70-150 Commercial Brass or Bronze 200-300 Aluminum 200-300 Aluminum Sheet 200-300 Magnesium 250-400 Wood 300-400 At a cutting speed of 200 ft/min for aluminum, Drill bit dia (in) RPM = 3.8*CS/Dia 0.1 7,600 0.125 6,100 0.15 5,100 0.175 4,300 0.2 3,800 0.225 3,400 0.25 3,000 0.275 2,800 0.3 2,500 0.325 2,300 0.35 2,200 0.375 2,000 0.4 1,900 0.425 1,800 0.45 1,700 0.475 1,600 0.5 1,500 As a sanity check, the calculated RPMs for the smaller drill bits are commensurate with the drill speeds recommended by rivet manufacturers for drilling aluminum. Note that the RPM table in the tool catalog uses a cutting speed of 250 ft/min for aluminum whereas I used 200 ft/min. Here is a small (30 KB) gif picture of the drill speed table from the above mentioned tool catalog. I'll leave it up for just a few days. http://www.AirplaneZone.com/Newsgrou...ill-Speeds.gif David O |
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