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#1
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how do I cut a 6-1/4" hole (not circle)
I'm building blast gates.
I need to cut some clean 6-1/4" (or thereabouts) holes. Ideally, I'd cut through the 3/4" + 1/4" + 3/4" at the same time to get a perfect fit. I'm guessing the router is the way to go, but can you lead me to some hints and tips, pictures, or other suggestions? Thanks, |
#2
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Use your collars. Lay out your desired opening on a sheet of template
material. Now determine your bit/collar difference for cutting. Say you're using 1/2" bit and a 3/4" collar. Nail your fencing strips 3/4" away from the layout lines. Now cut the pattern (it'll be 3/8" too large in both dimensions), remove the fences, use your new template to cut your openings, which will, of course be 3/8 smaller because of the bit/collar difference. . wrote in message news I'm building blast gates. I need to cut some clean 6-1/4" (or thereabouts) holes. Ideally, I'd cut through the 3/4" + 1/4" + 3/4" at the same time to get a perfect fit. I'm guessing the router is the way to go, but can you lead me to some hints and tips, pictures, or other suggestions? Thanks, |
#3
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#4
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Teach me to change dimensions in mid-thought. Change the 1/2 bit to 3/8.
Or, use 1/4 differences with the 1/2 bit. "George" george@least wrote in message ... Use your collars. Lay out your desired opening on a sheet of template material. Now determine your bit/collar difference for cutting. Say you're using 1/2" bit and a 3/4" collar. Nail your fencing strips 3/4" away from the layout lines. Now cut the pattern (it'll be 3/8" too large in both dimensions), remove the fences, use your new template to cut your openings, which will, of course be 3/8 smaller because of the bit/collar difference. .. wrote in message news I'm building blast gates. I need to cut some clean 6-1/4" (or thereabouts) holes. Ideally, I'd cut through the 3/4" + 1/4" + 3/4" at the same time to get a perfect fit. I'm guessing the router is the way to go, but can you lead me to some hints and tips, pictures, or other suggestions? Thanks, |
#5
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A plunge router with straight bit and circle cutting jig is about as
sharp and clean as any method you might try and better than most. I use a Dewalt 621 router, a 1/2" straight bit, and a Jasper circle cutting jig. I've cut numerous holes for dust collection using this method. You can make your own circle cutting jig from a flat sheet material like MDF, tempered hardboard or plywood. The method is precise enough, that I don't think you need to cut all your holes simultaneously. Most jigs work off a small pilot pin located at the center. If you drill this pilot hole in all your stock simultaneously, then cut your circles individually with the router, the holes will line up with each other. The small Jasper circle jig is available from Woodcraft. It has settings for holes 1" to 7 1/2" in 1/16" increments. Bob |
#6
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Circle cutter on a drill press works great and gives really clean
holes John On Thu, 09 Dec 2004 04:17:11 -0700, wrote: I'm building blast gates. I need to cut some clean 6-1/4" (or thereabouts) holes. Ideally, I'd cut through the 3/4" + 1/4" + 3/4" at the same time to get a perfect fit. I'm guessing the router is the way to go, but can you lead me to some hints and tips, pictures, or other suggestions? Thanks, |
#7
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I've read mixed reviews on cutting holes with a drill press in the rec
archives. I'm sure not all circle cutters are created equal. What brand do you use and recommend? Bob |
#8
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On 9 Dec 2004 07:00:41 -0800, "Bob"
wrote: I've read mixed reviews on cutting holes with a drill press in the rec archives. I'm sure not all circle cutters are created equal. What brand do you use and recommend? Bob Many stores sell circle cutters (Home Depot, Lowes, Sears, Ace, hardware stores, etc). Look at the package and find out where it is made. Made in USA, made in Canada, made in Germany are usually good. Lowest quality (for machined tools and castings) is "Made in China." A circle cutter is about the most risky thing on a drill press, so think carefully during setup and operation. |
#9
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Is the 6.25" diameter, 3-1/8" radius going to be a challenge?
My PC690's baseblate is 5-3/4" dia. I'm going to be pivoting very close to it's edge. On 9 Dec 2004 06:52:41 -0800, "Bob" wrote: A plunge router with straight bit and circle cutting jig is about as sharp and clean as any method you might try and better than most. I use a Dewalt 621 router, a 1/2" straight bit, and a Jasper circle cutting jig. I've cut numerous holes for dust collection using this method. You can make your own circle cutting jig from a flat sheet material like MDF, tempered hardboard or plywood. The method is precise enough, that I don't think you need to cut all your holes simultaneously. Most jigs work off a small pilot pin located at the center. If you drill this pilot hole in all your stock simultaneously, then cut your circles individually with the router, the holes will line up with each other. The small Jasper circle jig is available from Woodcraft. It has settings for holes 1" to 7 1/2" in 1/16" increments. Bob |
#10
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George,
how do I get the round template to start with? rough out w/ jigsaw then sand? just curious On Thu, 9 Dec 2004 07:42:31 -0500, "George" george@least wrote: Teach me to change dimensions in mid-thought. Change the 1/2 bit to 3/8. Or, use 1/4 differences with the 1/2 bit. "George" george@least wrote in message ... Use your collars. Lay out your desired opening on a sheet of template material. Now determine your bit/collar difference for cutting. Say you're using 1/2" bit and a 3/4" collar. Nail your fencing strips 3/4" away from the layout lines. Now cut the pattern (it'll be 3/8" too large in both dimensions), remove the fences, use your new template to cut your openings, which will, of course be 3/8 smaller because of the bit/collar difference. . wrote in message news I'm building blast gates. I need to cut some clean 6-1/4" (or thereabouts) holes. Ideally, I'd cut through the 3/4" + 1/4" + 3/4" at the same time to get a perfect fit. I'm guessing the router is the way to go, but can you lead me to some hints and tips, pictures, or other suggestions? Thanks, |
#11
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Did any one notice in the subject line that he says "not a circle"
Circle cutter on a drill press works great and gives really clean holes John On Thu, 09 Dec 2004 04:17:11 -0700, wrote: I'm building blast gates. I need to cut some clean 6-1/4" (or thereabouts) holes. Ideally, I'd cut through the 3/4" + 1/4" + 3/4" at the same time to get a perfect fit. I'm guessing the router is the way to go, but can you lead me to some hints and tips, pictures, or other suggestions? Thanks, |
#12
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Sorry, I saw the "(not circle)" and assumed it was not going to be a circle.
No problem starting with a trammel point to cut a female template, though. No problem with a circle-cutting jig and a bandsaw to cut a male jig. Allow your offset for the collar, and note that you cut in opposite directions with the router when using female versus male jigs. wrote in message ... George, how do I get the round template to start with? rough out w/ jigsaw then sand? just curious On Thu, 9 Dec 2004 07:42:31 -0500, "George" george@least wrote: Teach me to change dimensions in mid-thought. Change the 1/2 bit to 3/8. Or, use 1/4 differences with the 1/2 bit. "George" george@least wrote in message ... Use your collars. Lay out your desired opening on a sheet of template material. Now determine your bit/collar difference for cutting. Say you're using 1/2" bit and a 3/4" collar. Nail your fencing strips 3/4" away from the layout lines. Now cut the pattern (it'll be 3/8" too large in both dimensions), remove the fences, use your new template to cut your openings, which will, of course be 3/8 smaller because of the bit/collar difference. . wrote in message news I'm building blast gates. I need to cut some clean 6-1/4" (or thereabouts) holes. Ideally, I'd cut through the 3/4" + 1/4" + 3/4" at the same time to get a perfect fit. I'm guessing the router is the way to go, but can you lead me to some hints and tips, pictures, or other suggestions? Thanks, |
#13
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It shouldn't be a problem. If the work piece in which you are cutting
the hole is small (providing little support for the router), you can place some supporting stock around it. I usually use a piece of 3/4" plywood as a base, then place the workpiece and some auxillary support stock on tope of the plywood base. I'll use carpet tape and/or brads to hold everything in place. I'll also use F-clamps to hold the base on the bench. The base is sacrificial. I make sure that the center pin goes through the workpiece and into the plywood base. This prevents accidents when you cut through on the last pass with the router. Your question is a good one, because the success of cutting clean circles with a router is totally dependent on everything being locked down tight. Don't depend on holding it with your hands. Bob |
#14
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Can't you use a circle cutter to cut a hole?
Bob |
#15
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Bob
Don't even remember the brand, but the key is to run the drill press slow, and FEED the circle cutter slowly to get a good clean cut. John On 9 Dec 2004 07:00:41 -0800, "Bob" wrote: I've read mixed reviews on cutting holes with a drill press in the rec archives. I'm sure not all circle cutters are created equal. What brand do you use and recommend? Bob |
#16
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On Thu, 09 Dec 2004 21:27:10 GMT, max vaguely
proposed a theory .......and in reply I say!: remove ns from my header address to reply via email Did any one notice in the subject line that he says "not a circle" Yeah, but I for one am not sure what _is_ wanted. |
#17
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Round is a bit hard with this method.
"George" george@least wrote in message ... Use your collars. Lay out your desired opening on a sheet of template material. Now determine your bit/collar difference for cutting. Say you're using 1/2" bit and a 3/4" collar. Nail your fencing strips 3/4" away from the layout lines. Now cut the pattern (it'll be 3/8" too large in both dimensions), remove the fences, use your new template to cut your openings, which will, of course be 3/8 smaller because of the bit/collar difference. .. wrote in message news I'm building blast gates. I need to cut some clean 6-1/4" (or thereabouts) holes. Ideally, I'd cut through the 3/4" + 1/4" + 3/4" at the same time to get a perfect fit. I'm guessing the router is the way to go, but can you lead me to some hints and tips, pictures, or other suggestions? Thanks, |
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