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Jigs and Fixtures This area will be directed towards the art of designing specific jigs and fixtures. Bob and Rick say, "if the specific operation is to make more than one piece the same size and shape then chances are you need a jig and/or fixtures."


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Old 03-22-2005, 07:45 PM   #1
reible
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Default how to do this?

Hi,

Someone has ask me how to make pieces like the one shown in the attachment as a profile. It would be done on 1/2" thick wood, the pieces are 4 1/2" tall and the length will vary. The six "notches" have a side that perpdicular and a slope to get the 6 of them. This "siding" for a doll house sort of deal. The sharp edges will be lightly sanded so a little rounding is not bad at the tips but the gullets should be crisp and clean.

At first I thought this would be easy but then....... anyone with a good idea as I think I will get to make some of these as this person doesn't have a router YET.

Ed
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Old 03-22-2005, 11:17 PM   #2
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I know how I would like to do that job but it may prove difficult without being able to hold the router at an angle.
If I had one, I would use a milling machine with the head tilted to produce the required angle and use a dovetail cutter to produce the section.
You would make one cut accros then move the table the distance between the tips then cut again and continue until the whole length is finished.
Easy with the right machine but difficult without.
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Old 03-22-2005, 11:26 PM   #3
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you may be able to do this if you made a router base plate that varied in thickness (like a wedge). Use a Dovetail bit, and a straight guide to keep your cut straight.
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Old 03-22-2005, 11:31 PM   #4
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I hope I'm not breaking any rules by recommending a tool other than a router, but it seems that the easiest way might me to use a molding cutter mounted in a radial arm saw with the blade rotated to matchthe angled cut on your teeth. Rip a series of well placed cuts, and then rip the strips off a wider board.
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Old 03-23-2005, 12:29 AM   #5
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Good I see some people have posted some ideas for me! I have determined the angle to be about 12 deg. I checked my router bits and I don't have a 12 deg dovetail..... I don't even know if they make that angle.

Dewy you sure are right about having a machine that can tilt.... that and a wide (.75") dovetail with the right angle would make short work of this. To bad I don't have one.

Jeff12002 I will have to look at that.... The width of the angle cut would be in the range of 3/4" so you would have to make two passes and adjust depth so getting things to match up might be real trick. But it might be the only game in town.

I don't use a router for everything so I have no problem with using a saw.... but the darn angle is not right...... if it were 90 deg. this would be a piece of cake. Maybe going back with a router to finish the cut and get the angle would work?????

Anyway I did a sketch of the router idea to show the problem....

Thanks guys!

I'm still open to ideas.....

Ed
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Old 03-23-2005, 04:23 AM   #6
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Ed, on one show Rick had to make an angle cut and created a jig using a pair of wedges and 1/4" plywood, sort of a ramp? Nice wide base for the router to move on, the angle decided by the wedges. That particular jig had a small slot for use with a guide bushing. It strikes me you could attach the ramp to your router table with double sided carpet tape and just pass your wood over it. The ramp would need to be long enough for some sort of indexing feature, a clamped on fence perhaps?
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Old 03-23-2005, 09:27 AM   #7
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Hi: My opinion for what it's worth is to use a table saw with a moulding head.
Using a block between the fence and the material would make it possible to adjust the sucessive cuts. The block would have to be fastened temporarily to the fence, for safty reasons. Other wise you could re-adjust the fence for each cut.

Hope this helps.. Woodnut65
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Old 03-23-2005, 10:20 AM   #8
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Ed,

Looks like an excellent project for the bandsaw.
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Old 03-23-2005, 10:05 PM   #9
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Hey Dewy, you still want that Bridgeport don't you? Saw dust in your lungs and cutting oil in your blood? Check Harbor Freight. Their combo machines are actually of pretty good quality for the money with adjustible gibs and ways, etc. Not a BP but.........
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Old 03-23-2005, 10:41 PM   #10
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Quote:
Originally Posted by aniceone2hold
Ed, on one show Rick had to make an angle cut and created a jig using a pair of wedges and 1/4" plywood, sort of a ramp? Nice wide base for the router to move on, the angle decided by the wedges. That particular jig had a small slot for use with a guide bushing. It strikes me you could attach the ramp to your router table with double sided carpet tape and just pass your wood over it. The ramp would need to be long enough for some sort of indexing feature, a clamped on fence perhaps?
This really is an excellent idea! You could put a fence on the bottom of the wedge for use as an edge guide. 1st pass with a 1/2" wide spacer block between the fence and the router. 2nd pass with the spacer block removed. If it absolutely/positively needs to be perfect, you could even add a couple of wedges under the jig after the second pass to make up the additional 2 deg left from a standard 14 deg bit for the 3d pass.
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