Jasper Tools 300 Circle Jig
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Description: Jasper Tools 300 Circle Jig
Plunge Router Cutting Jig for Big Holes and Tabletops - 7 inches (17.8 cm) to a huge 52 ¾ inches (134 cm) in diameter approx.
It has 184 pre-drilled pivot holes for making 184 different size circles. The Model 300 is graduated in ¼ inch (0.635 cm) increments and is calibrated for a ½ inch (1.27cm) router bit.
Now available Model 300 PRO: The M300Pro is the same as the Model 300 except that it is made of virtually unbreakable polycarbonate plastic. Select above for the model you would like, standard acrylic or polycarbonate.
The Model 300 Jasper Tools Circle Jig was designed primarily for making large speaker cut-outs, large cutouts and tabletops. It fits virtually all routers, you can use the supplied centring jig to drill your own holes if your router doesn't match the pre-drilled holes.
Circle Diameter: 7 inches (17.78 cm) to a huge 52 3/4 inches (133.985 cm) in diameter.
By using a 3/8 inch (0.9525 cm) router bit circle diameter resolution is increased to 1/8 inch (0.31 cm) increments approx. It can actually make 368 different size circles by alternating a 1/2 inch (1.27 cm) router bit and a 3/8 inch (0.9525 cm) router bit approximately.
This jig also allows you to make partial cuts or rebates into the timber in the same easy fashion. Now you can mount the speaker driver flush against the wood for a very professional finish with the added benefit of reducing sound diffraction against the speaker's edge.
Model 300 in action!
GENERAL INFORMATION: The Model 300 allows the woodworker to easily produce holes from 7 inches to 52 3/4 inches in diameter. It has 184 pre-drilled pivot holes for making 184 different size circles. The Model 300 is graduated in 1/4 inch increments and is calibrated for a 1/2 inch router bit. By using a 3/8 inch router bit circle diameter resolution is increased to 1/8 inch increments. It can actually make 368 different size circles by alternating a 1/2 inch router bit and a 3/8 inch router bit. The pivot holes are precision drilled so that the jig holds the pin in the selected hole without falling out.
SAFETY: Read all the precautions that came with your router. Make sure your router is unplugged while changing the bit and leave router unplugged until you complete your set-up and you are ready to route your circle. Always use eye and hearing protection while routing.
MOUNTING THE JIG TO THE ROUTER: Locate your router on the diagram on the rear side of the package. Locate and mark the mounting holes for your router on the diagram. Align the jig over the diagram so that the mounting holes on the jig are aligned with the diagram. Locate the marked mounting holes for your router and mark the countersinks on your jig with a felt pen. Locate the jig on the router so that the holes that you marked align with the holes in the base of your router and mount the jig with the supplied screws.
SETTING UP: The figure below shows a typical set-up for cutting circular holes, mortises, or disks. The workpiece should be taped to the backup with double sided tape on both the inside and the outside of the cutout. Using a 1/8 inch diameter drill bit, drill a vertical hole through the workpiece and into the backup. This hole should be located at the centre of the circle to be cut. The Model 350 can be used instead of drilling a hole.
HOW TO USE THE SCALE: The jig has inches listed along the horizontal scale on the bottom edge of the pivot hole pattern, and the fractions listed vertically along the left end. To find the 12 1/2 inch pivot hole, find the 12 inch column of holes from the horizontal scale and the 1/2 inch row of holes from the vertical scale. Follow these lines to the 12 1/2 inch pivot hole and insert your pivot pin there.
MAKING CUTOUTS: The jig is calibrated to make disks using a 1/2 inch diameter router bit. To make cutouts, use a 1/2 inch router bit and subtract 1 inch from the scale.
CONVERSIONS: To convert mm to inches: Inches = mm / 25.4. Use the following example to convert decimal fractional parts to fractional parts: If your cutout is 6.729 inches, you convert the fractional part (0.729) to 1/16ths of an inch by multiplying 0.729 x 16 which is equal to 11.664. Round this number up to 12. So your cutout would be 6 12/16 or 6 3/4 inches in diameter.
Set-up for circle routing.