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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Drilling Alignment Problem
I'm making a rack out of several ~ 9" long sections of 2 1/2" PVC pipe.
Each section of pipe is cut square on the bottom, and at a 45 degree angle on the top end. The idea is to fasten them to a pair of horizontal rails, using a through bolt on the bottom (which will prevent the objects from falling out), and a short bolt through the back of the top wall with the angle cut sloping forward & down. I have the tubes all cut, and now I need to drill them. The thing I'm pondering is how to best align the slopes so that I can drill the holes on my mill. I can clamp the tubes horizontally using a V-jaw in my vise, but I'd like to come up with a repeatable way of making sure the holes are "square" to the sloping section. I need to make sure the two holes in each tube are parallel to mate well with the rails. IF I could be assured of repeatable rotational alignment, I could drill all the holes in the square ends, and then all the holes in the beveled end. This would be a lot faster than clamping each piece & cranking back & forth 8 inches to drill both holes without removing each piece from the vise. The best idea I've come up with so far is to clamp a rod horizontally at the approximate height of the middle of the tube. If the rod is square to the mill, the rod can serve as a "stop" to push the tube against, and it should force the slope to rotate & align correctly. I have one of these that I could use: http://www.use-enco.com/CGI/INSRIT?PMAKA=TN337-9322 My only concern is if it's rigid enough & getting it aligned in the first place. I have a gut feeling that there ought to be a better way, either simpler or more accurate, but I'm damned if I can think of one. Any ideas? Thanks! Doug White |
#2
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Drilling Alignment Problem
On 26-Jul-2011 21:50, Doug White wrote:
The thing I'm pondering is how to best align the slopes so that I can drill the holes on my mill. The only thing about the part the way it's cut that is not radially symmetrical is the 45-degree cut on one end. Whatever you come up with is going to have to index that somehow. If it were me, I would make a plywood box jig with sides to locate the pipe, with one end cut at 45-degrees and boxed in. Shove the pipe into the 45 wedge section and it is forced into alignment for drilling. __________________________________________________ __________________ Gardner Buchanan gbuchana(a)teksavvy(dot)com FreeBSD: Where you want to go. Today. |
#3
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Drilling Alignment Problem
On Jul 26, 9:50*pm, Doug White wrote:
I'm making a rack out of several ~ 9" long sections of 2 1/2" PVC pipe. * Each section of pipe is cut square on the bottom, and at a 45 degree angle on the top end. *The idea is to fasten them to a pair of horizontal rails, using a through bolt on the bottom (which will prevent the objects from falling out), and a short bolt through the back of the top wall with the angle cut sloping forward & down. *I have the tubes all cut, and now I need to drill them. The thing I'm pondering is how to best align the slopes so that I can drill the holes on my mill. *I can clamp the tubes horizontally using a V-jaw in my vise, but I'd like to come up with a repeatable way of making sure the holes are "square" to the sloping section. *I need to make sure the two holes in each tube are parallel to mate well with the rails. *IF I could be assured of repeatable rotational alignment, I could drill all the holes in the square ends, and then all the holes in the beveled end. * This would be a lot faster than clamping each piece & cranking back & forth 8 inches to drill both holes without removing each piece from the vise. The best idea I've come up with so far is to clamp a rod horizontally at the approximate height of the middle of the tube. *If the rod is square to the mill, the rod can serve as a "stop" to push the tube against, and it should force the slope to rotate & align correctly. *I have one of these that I could use: http://www.use-enco.com/CGI/INSRIT?PMAKA=TN337-9322 My only concern is if it's rigid enough & getting it aligned in the first place. I have a gut feeling that there ought to be a better way, either simpler or more accurate, but I'm damned if I can think of one. * Any ideas? Thanks! Doug White I would try to use an angle plate for the stop to drill the first hole, then set up a vertical peg to locate the pipe for the second one. Perhaps you could clamp a bar across the top of the vise and jam the angled end of the pipe under it. jsw |
#4
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Drilling Alignment Problem
Doug White wrote:
I'm making a rack out of several ~ 9" long sections of 2 1/2" PVC pipe. Each section of pipe is cut square on the bottom, and at a 45 degree angle on the top end. The idea is to fasten them to a pair of horizontal rails, using a through bolt on the bottom (which will prevent the objects from falling out), and a short bolt through the back of the top wall with the angle cut sloping forward & down. I have the tubes all cut, and now I need to drill them. The thing I'm pondering is how to best align the slopes so that I can drill the holes on my mill. I can clamp the tubes horizontally using a V-jaw in my vise, but I'd like to come up with a repeatable way of making sure the holes are "square" to the sloping section. I need to make sure the two holes in each tube are parallel to mate well with the rails. IF I could be assured of repeatable rotational alignment, I could drill all the holes in the square ends, and then all the holes in the beveled end. This would be a lot faster than clamping each piece & cranking back & forth 8 inches to drill both holes without removing each piece from the vise. The best idea I've come up with so far is to clamp a rod horizontally at the approximate height of the middle of the tube. If the rod is square to the mill, the rod can serve as a "stop" to push the tube against, and it should force the slope to rotate & align correctly. I have one of these that I could use: http://www.use-enco.com/CGI/INSRIT?PMAKA=TN337-9322 My only concern is if it's rigid enough & getting it aligned in the first place. I have a gut feeling that there ought to be a better way, either simpler or more accurate, but I'm damned if I can think of one. Any ideas? How about just a rectangular piece of scrap? Or a few-inch long piece of square tube the right size? Good Luck! Rich |
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