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#1
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I am new at this so I don't know what to expect and I need some advice.
I know that this is woodworking and not precision stuff where you want 0.001 inch tolerance but I am getting some really bad results. I am trying to drill some shelf pin holes using a PC plunge router with a 1/4 inch carbide spiral bit, a 1/2 inch to 1/4 inch collet reducer, and a shelf pin gulde. I clamp the guide to the work to make sure that it doesn't move while plungeing the router, and I have cleaned the collet holder and collet. Here are some measurements I made: the router bit diameter is right on the money at -0.0005 inches. I used a dial indicator to measure the wobble of a piece of drill rod to be 0.002 inches at a point 1.75 inches from the collet base, which corresponds to the tip of the router bit when it is installed. This should give a hole about 0.004 oversize, right? The holes actually measure about 0.005 to 0.007 oversize. No big deal, after all this is wood. The shelf pins measure about 0.003 to 0.004 under size. So here is the problem; holes too big and pins too small make for around 0.010 slop in the fit of the pins. Is a loose fit like this normal or can I do something to get the pins to fit better. I know that the pins will not fall out when the shelfs are placed on them, but the very loose fit of the pins bothers me. Should I worry about this or not? I can actually drill a better fitting hole using a hand held drill and a 1/4 inch forstner bit, but then I lose the placement accuracy of the guide. Any suggestions? What is a normal value for router bit wobble? is 0.002 too large or is it about normal? Thanks for any advice. |
#2
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#4
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Woodworker's hardware sells brass grommets made for 1/4" shelf pins, if
there's enough play in your holes to pound them in, you'd be set. Rick -- Rick Nagy Johnstown, PA - Remove nospam to email me Be sure to check out my website at http://www.rickscabinetshop.com wrote in message ... I am new at this so I don't know what to expect and I need some advice. I know that this is woodworking and not precision stuff where you want 0.001 inch tolerance but I am getting some really bad results. I am trying to drill some shelf pin holes using a PC plunge router with a 1/4 inch carbide spiral bit, a 1/2 inch to 1/4 inch collet reducer, and a shelf pin gulde. I clamp the guide to the work to make sure that it doesn't move while plungeing the router, and I have cleaned the collet holder and collet. Here are some measurements I made: the router bit diameter is right on the money at -0.0005 inches. I used a dial indicator to measure the wobble of a piece of drill rod to be 0.002 inches at a point 1.75 inches from the collet base, which corresponds to the tip of the router bit when it is installed. This should give a hole about 0.004 oversize, right? The holes actually measure about 0.005 to 0.007 oversize. No big deal, after all this is wood. The shelf pins measure about 0.003 to 0.004 under size. So here is the problem; holes too big and pins too small make for around 0.010 slop in the fit of the pins. Is a loose fit like this normal or can I do something to get the pins to fit better. I know that the pins will not fall out when the shelfs are placed on them, but the very loose fit of the pins bothers me. Should I worry about this or not? I can actually drill a better fitting hole using a hand held drill and a 1/4 inch forstner bit, but then I lose the placement accuracy of the guide. Any suggestions? What is a normal value for router bit wobble? is 0.002 too large or is it about normal? Thanks for any advice. |
#5
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In article ,
wrote: I am new at this so I don't know what to expect and I need some advice. I know that this is woodworking and not precision stuff where you want 0.001 inch tolerance but I am getting some really bad results. I am trying to drill some shelf pin holes using a PC plunge router with a 1/4 inch carbide spiral bit, a 1/2 inch to 1/4 inch collet reducer, and a shelf pin gulde. I clamp the guide to the work to make sure that it doesn't move while plungeing the router, and I have cleaned the collet holder and collet. Here are some measurements I made: the router bit diameter is right on the money at -0.0005 inches. I used a dial indicator to measure the wobble of a piece of drill rod to be 0.002 inches at a point 1.75 inches from the collet base, which corresponds to the tip of the router bit when it is installed. This should give a hole about 0.004 oversize, right? The holes actually measure about 0.005 to 0.007 oversize. No big deal, after all this is wood. The shelf pins measure about 0.003 to 0.004 under size. So here is the problem; holes too big and pins too small make for around 0.010 slop in the fit of the pins. Is a loose fit like this normal or can I do something to get the pins to fit better. I know that the pins will not fall out when the shelfs are placed on them, but the very loose fit of the pins bothers me. Should I worry about this or not? I can actually drill a better fitting hole using a hand held drill and a 1/4 inch forstner bit, but then I lose the placement accuracy of the guide. Any suggestions? What is a normal value for router bit wobble? is 0.002 too large or is it about normal? Thanks for any advice. Personally I would use a drill and home made guide or a piece of peg board. I really really dislike using a router because of the noise and can't imagine using one for dozens or hundreds of holes. For that matter, I've come to the opinion that adjustable shelves are highly overrated and haven't used them very much for a few years (Mostly when requested^H^H^H^H^H^H^H^H^H specified by SWMBO) Seems like the adjustable shelf feature gets a one-time use over the life of the piece. Honestly, I have never taken a DI to a router to measure runout. So far IME if I can't see it or feel it it's been acceptable. A -- Often wrong, never in doubt. Larry Wasserman - Baltimore, Maryland - |
#6
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Hi there another suggestion,
1- take one piece of 1/2" plywood 12" wide, about 36" long shorter if you need it. 2- mark the center down the length of the board 3-mark on the center line about every 1" or so a line 4- drill holes with a speed bit the size of one of your bushings that you know you will have for along time 5-rip the board in half that you just drilled, rip down the middle of the holes you just drilled 6-creating 2 halves identical 7-clamp to board you want holes in for shelf pins on each side 8-place router with bushing on top of new template and use plunge mechanism and slide down board, plunge , raise, slide down to next hole, plunge and go at it. 9-fastest way I have found to make holes, simplest and most accurate.Not often you get all that in one. 10-smile on your face wrote in message news ![]() In article , wrote: I am new at this so I don't know what to expect and I need some advice. I know that this is woodworking and not precision stuff where you want 0.001 inch tolerance but I am getting some really bad results. I am trying to drill some shelf pin holes using a PC plunge router with a 1/4 inch carbide spiral bit, a 1/2 inch to 1/4 inch collet reducer, and a shelf pin gulde. I clamp the guide to the work to make sure that it doesn't move while plungeing the router, and I have cleaned the collet holder and collet. Here are some measurements I made: the router bit diameter is right on the money at -0.0005 inches. I used a dial indicator to measure the wobble of a piece of drill rod to be 0.002 inches at a point 1.75 inches from the collet base, which corresponds to the tip of the router bit when it is installed. This should give a hole about 0.004 oversize, right? The holes actually measure about 0.005 to 0.007 oversize. No big deal, after all this is wood. The shelf pins measure about 0.003 to 0.004 under size. So here is the problem; holes too big and pins too small make for around 0.010 slop in the fit of the pins. Is a loose fit like this normal or can I do something to get the pins to fit better. I know that the pins will not fall out when the shelfs are placed on them, but the very loose fit of the pins bothers me. Should I worry about this or not? I can actually drill a better fitting hole using a hand held drill and a 1/4 inch forstner bit, but then I lose the placement accuracy of the guide. Any suggestions? What is a normal value for router bit wobble? is 0.002 too large or is it about normal? Thanks for any advice. Personally I would use a drill and home made guide or a piece of peg board. I really really dislike using a router because of the noise and can't imagine using one for dozens or hundreds of holes. For that matter, I've come to the opinion that adjustable shelves are highly overrated and haven't used them very much for a few years (Mostly when requested^H^H^H^H^H^H^H^H^H specified by SWMBO) Seems like the adjustable shelf feature gets a one-time use over the life of the piece. Honestly, I have never taken a DI to a router to measure runout. So far IME if I can't see it or feel it it's been acceptable. A -- Often wrong, never in doubt. Larry Wasserman - Baltimore, Maryland - |
#7
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wrote:
holes too big and pins too small make for around 0.010 slop in the fit of the pins. Is a loose fit like this normal or can I do something to get the pins to fit better. I know that the pins will not fall out when the shelfs are placed on them, but the very loose fit of the pins bothers me. Should I worry about this or not? No -- dadiOH ____________________________ dadiOH's dandies v3.06... ....a help file of info about MP3s, recording from LP/cassette and tips & tricks on this and that. Get it at http://mysite.verizon.net/xico |
#8
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