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#1
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Specialized Drill Bit
Or at least one that is semi-specialized.
I need to drill holes in 1/4" thick metal rails, top and bottom to put new pickets in. The design the owners like best involves a countersunk screw on the top rail. What's the best way? 1. Is there likely to be a bit for metal that will combine drilling the through hole and the countersink part, the same way there is for wood? 2. If not, I can do the operation in two steps-the through hole first, then the countersink portion. 3. In either case, how do I control for depth for the countersink part, so the top of the screw ends up being flush, or nearly so, within paint thickness? 4. Also, the countersink should have the same angle as the screw itself. How difficult will it be to match? 5. Any suggestions for suppliers? HD and similar stores probably won't have the bits I need. Thanks, charles |
#2
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Specialized Drill Bit
Outlets that sell metal working supplies have them.
"Charles Bishop" wrote in message ... Or at least one that is semi-specialized. I need to drill holes in 1/4" thick metal rails, top and bottom to put new pickets in. The design the owners like best involves a countersunk screw on the top rail. What's the best way? 1. Is there likely to be a bit for metal that will combine drilling the through hole and the countersink part, the same way there is for wood? 2. If not, I can do the operation in two steps-the through hole first, then the countersink portion. 3. In either case, how do I control for depth for the countersink part, so the top of the screw ends up being flush, or nearly so, within paint thickness? 4. Also, the countersink should have the same angle as the screw itself. How difficult will it be to match? 5. Any suggestions for suppliers? HD and similar stores probably won't have the bits I need. Thanks, charles |
#3
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Specialized Drill Bit
Maybe a center drill would work for you? Google "center drill" for
examples. They are for metalworking. You are correct, you will not find them at HD. "Charles Bishop" wrote in message ... Or at least one that is semi-specialized. I need to drill holes in 1/4" thick metal rails, top and bottom to put new pickets in. The design the owners like best involves a countersunk screw on the top rail. What's the best way? 1. Is there likely to be a bit for metal that will combine drilling the through hole and the countersink part, the same way there is for wood? 2. If not, I can do the operation in two steps-the through hole first, then the countersink portion. 3. In either case, how do I control for depth for the countersink part, so the top of the screw ends up being flush, or nearly so, within paint thickness? 4. Also, the countersink should have the same angle as the screw itself. How difficult will it be to match? 5. Any suggestions for suppliers? HD and similar stores probably won't have the bits I need. Thanks, charles |
#4
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Specialized Drill Bit
check out one of those step drills. the angle might not be perfect but it
might just work. they cut very fast and easy to control the depth Mike "Charles Bishop" wrote in message ... Or at least one that is semi-specialized. I need to drill holes in 1/4" thick metal rails, top and bottom to put new pickets in. The design the owners like best involves a countersunk screw on the top rail. What's the best way? 1. Is there likely to be a bit for metal that will combine drilling the through hole and the countersink part, the same way there is for wood? 2. If not, I can do the operation in two steps-the through hole first, then the countersink portion. 3. In either case, how do I control for depth for the countersink part, so the top of the screw ends up being flush, or nearly so, within paint thickness? 4. Also, the countersink should have the same angle as the screw itself. How difficult will it be to match? 5. Any suggestions for suppliers? HD and similar stores probably won't have the bits I need. Thanks, charles |
#5
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Specialized Drill Bit
Charles Bishop writes:
What's the best way? What species of metal? Wide selection of bits he http://www.use-enco.com/CGI/INSRAR?PMSECT=0000000606 Use a center punch to start the hole. Use cutting oil and the right bit rotational speed. Use a drill press if you have one. A good drill press will have a stop setting to get the countersink depth just right. Your screws probably use a 60 degree included angle. |
#6
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Specialized Drill Bit
you'll need to determine the angle of the countersink. the most common are
90° and 82°. you can get chamfer tools accordingly. an easy place to find them is at www.mcmaster.com To control depth, if not in a drill press situation, you'll need to cut and try. bill "Charles Bishop" wrote in message ... Or at least one that is semi-specialized. I need to drill holes in 1/4" thick metal rails, top and bottom to put new pickets in. The design the owners like best involves a countersunk screw on the top rail. What's the best way? 1. Is there likely to be a bit for metal that will combine drilling the through hole and the countersink part, the same way there is for wood? 2. If not, I can do the operation in two steps-the through hole first, then the countersink portion. 3. In either case, how do I control for depth for the countersink part, so the top of the screw ends up being flush, or nearly so, within paint thickness? 4. Also, the countersink should have the same angle as the screw itself. How difficult will it be to match? 5. Any suggestions for suppliers? HD and similar stores probably won't have the bits I need. Thanks, charles |
#7
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Specialized Drill Bit
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