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Drilling stainless steel
I am working on a project and will have to drill 8 holes in 8-18
stainless steel. The stock is 3/16" thick. I have good equipment .. drill press, machinist vise, sharp drill bits, etc. The holes will be 13/32" in size. Shall I drill in one step or start with a pilot hole and enlarge. If the latter, what drill sizes should I use? All suggestions appreciated. Thanks Norm |
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"NSN" wrote in message ... I am working on a project and will have to drill 8 holes in 8-18 stainless steel. The stock is 3/16" thick. I have good equipment .. drill press, machinist vise, sharp drill bits, etc. The holes will be 13/32" in size. Shall I drill in one step or start with a pilot hole and enlarge. If the latter, what drill sizes should I use? All suggestions appreciated. Thanks Norm Consider buying a step drill, Unibit is one brand name. Start with a pilot hole, 1/8"-3/16" or so. Sharp, (new), drill bit, lots of pressure and slow speed. Stainless work hardens so if you use a dull bit, you may never get a hole drilled in that spot. Greg |
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#4
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"NSN" wrote in message ... I am working on a project and will have to drill 8 holes in 8-18 stainless steel. The stock is 3/16" thick. I have good equipment .. drill press, machinist vise, sharp drill bits, etc. The holes will be 13/32" in size. Shall I drill in one step or start with a pilot hole and enlarge. If the latter, what drill sizes should I use? All suggestions appreciated. Thanks Norm I would make certain to use a good entry material, well clamped to the stainless steel. This way the burrs will be on the entry and not on the finished product. As far as what material to use for this....just pick something close in hardness to stainless and maybe 1/8" thick or so....Make a few test holes in scrap if you aren't comfortable with the setup....good luck...Ross |
#6
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I would buy 2 carbide drill bits. 5/32 and 13/32. If you attempt
with HSS slow with lots of coolant. On Sun, 06 Feb 2005 03:29:27 GMT, NSN wrote: I am working on a project and will have to drill 8 holes in 8-18 stainless steel. The stock is 3/16" thick. I have good equipment .. drill press, machinist vise, sharp drill bits, etc. The holes will be 13/32" in size. Shall I drill in one step or start with a pilot hole and enlarge. If the latter, what drill sizes should I use? All suggestions appreciated. Thanks Norm |
#7
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THANKS to all who replied. I have a new set of titanium nitride coated HSS drill bits. I used a 3/16 and 13/32 with plenty of coolant and a slow speed. EASY !!! The stainless was type 303 and not very hard. Having a heavy duty drill press (30 year old Rockwell) and a good vise helped. My drill bits seem to have tolerated the drilling quite well and remain sharp. FYI: I got the bits from Harbor Freight. Over the years I have found that their drill bits and "good" screwdrivers are as good or better than my USA stuff (I do have a set of SnapOn screwdrivers for comparison). Norm On Sun, 06 Feb 2005 21:07:35 GMT, Steve wrote: I would buy 2 carbide drill bits. 5/32 and 13/32. If you attempt with HSS slow with lots of coolant. On Sun, 06 Feb 2005 03:29:27 GMT, NSN wrote: I am working on a project and will have to drill 8 holes in 8-18 stainless steel. The stock is 3/16" thick. I have good equipment .. drill press, machinist vise, sharp drill bits, etc. The holes will be 13/32" in size. Shall I drill in one step or start with a pilot hole and enlarge. If the latter, what drill sizes should I use? All suggestions appreciated. Thanks Norm |
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