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post #1 of 12 (permalink) Old 01-30-2011, 08:58 PM Thread Starter
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Default concave jig

I'm building hardwood skateboards and am trying to build a jig that will let me rout a concave deck and also a convex bottom. I figure the jigs will just have to have opposing arcs. Any thoughts or ideas would be great. thanks!
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post #2 of 12 (permalink) Old 01-30-2011, 11:06 PM
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G'day Ryan

Welcome to the forum

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post #3 of 12 (permalink) Old 01-31-2011, 03:06 AM
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Hi Ryan, first off as you probably know, the curve in a skateboard is usually made by bending it into shape.
If you're determined to rout them, you want a rail and sled type set up.
2 straight rail set parallel to each other and a sled that the router is mounted to that has a concave base and another convex base.
The router and sled travel on the rails.
Hopefully this picture will make it clear for you even though it's being used on a guitar.

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post #4 of 12 (permalink) Old 01-31-2011, 07:31 AM
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Quote:
Originally Posted by rrwc110 View Post
I'm building hardwood skateboards and am trying to build a jig that will let me rout a concave deck and also a convex bottom. I figure the jigs will just have to have opposing arcs. Any thoughts or ideas would be great. thanks!
Hi Ryan, Welcome.
Look into bent lamination for your decks. I worked with a guy & this is how he made his boards. They came out very nice.

James
Whittier, CA.

Have a nice & safe day!
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post #5 of 12 (permalink) Old 01-31-2011, 08:55 AM Thread Starter
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I really appreciate the tips The picture is cool and helps a lot. About laminations, We're trying to go a different way than other longboard builders. We're using exotic hardwoods and making each board to order for customers. We can guarantee that no two boards will be the same.
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post #6 of 12 (permalink) Old 01-31-2011, 08:57 AM Thread Starter
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Great picture, one of my friends recently asked me to build him a guitar, so perfect!
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post #7 of 12 (permalink) Old 11-15-2011, 11:30 AM
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Default Why is the profile created with this jig Convex?

Quote:
Originally Posted by gav View Post
Hi Ryan, first off as you probably know, the curve in a skateboard is usually made by bending it into shape.
If you're determined to rout them, you want a rail and sled type set up.
2 straight rail set parallel to each other and a sled that the router is mounted to that has a concave base and another convex base.
The router and sled travel on the rails.
Hopefully this picture will make it clear for you even though it's being used on a guitar.

Hello Gavin,

I see the arc base in the photo - but do not understand why it creates a convex profile on top of he neck. It seems that the top of the bit is the same distance from the top of the guitar neck so it would simply plane/flatten the top of the guitar neck as the router is moved along the rails.
Is the arc base actually being rotated back and forth on the rails to get the curve?

Greg
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post #8 of 12 (permalink) Old 11-15-2011, 12:13 PM
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Yep, apparently that's how it works. For a guitar neck it's quite a shallow curve.
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post #9 of 12 (permalink) Old 11-15-2011, 02:50 PM
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Greg, the arc of the jig is what defines the cut. If you think this is way out there check out these jigs and the legs they make. Photo 3 shows using a round over bit on one of the legs. The Router Workshop videos are priceless with all the excellent information offered; I highly recommend them.
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post #10 of 12 (permalink) Old 11-16-2011, 10:53 AM
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Thanks Mike - those legs are out there. I will have to check the videos out. I used to watch the show regularly and picked up a lot of good tricks.
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