Jasper 270J Model 270 Router Circle Cutting Jig
by Jasper Tools
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List Price: Our Price: $41.99 You Save: $6.95 (14%) Availability: Usually ships in 24 hours Category: Tools See more product details |
Product Details
Manufacturer: Jasper ToolsModel: 270J
Product features:
- One pass circle jig
- 180 different size cutouts
- Pre drilled for your router
- No trial cuts
Tools and Hardware Reviews of Jasper 270J Model 270 Router Circle Cutting Jig
Customer Review: works OK, for those who can't divide by 2
Summary: 3 Stars
As an avid woodworker of several decades who has an abiding interest in loudspeaker design, I have heard about this thing for years. Presumably, it "takes all the guesswork" out of routing holes for speakers.
Guesswork? What guesswork? Routing a circular hole is easy with stock router guides. Every decent router I've ever seen comes with an included edge guide and most good routers come with a circle attachment or have one available. For that matter you can make a jig from lexan or fiberboard in about five minutes. None of my jigs cost more than $2 bucks.
Routing large circular holes for large speakers, (6.5 to 18 inches ) is best accomplished with a dedicated homemade jig.
Cutting smaller holes for small drivers and tweeters can be done with a drill or drill press and dedicated hole-cutting saws.
Believe me; if you must cut twenty small holes for a line-array tower, the drill press or even a handheld drill is much easier and faster!
Now... does this thing work? Yeah. My buddy has one and he wanted to show me how well it works. At his shop, I saw him remove the factory base, replace it with this gadget, make sure the holes were aligned, drill pilot holes, re-read the instructions and ( finally) make a hole. It worked OK.
Meanwhile, I used my old PC router with the stock base in place; Attached the edge guide, measured and cut. I finished three holes to his one.
Small holes are MUCH easier to cut with a hole saw. Just go SLOWLY, especially at first. DO NOT wiggle the saw! Keep the bit perpendicular to the piece, or better yet use a drill press. DO NOT use an adjustable hole-cuter without a drill press. Even then, you must have a SHARP bit, plenty of clamping force and GO SLOWLY!
To cut large holes with a router, you halve the hole-diameter and subtract the bit-diameter.
Example: Nominal speaker size is 8 inches; But the speaker cut-out is 7.5 inches. Divide that by 2. (= 3.75)
I was using a quarter-inch bit, so I subtracted another 0.25. Bingo! 3.5 inches from center.
If higher math like that scares you, go ahead and spend $40 bucks on this thing.
If you want to save money by building your own speakers, you are going to do a LOT of math FAR more complicated than this simple arithmetic needed for routing holes. Either that, or you buy pre-cut kits. There is no economy in building your own speakers if you must buy a shop-full of gizmos for every cutting or joining operation. Routers are versatile tools and you can economically make all sorts of good woodworking joints with them; But it seems foolish to buy unnecessary plastic plates like this one. It's a lot cheaper to make your own jigs for big holes. Small hole-saws are cheap, fast and safe.
Description of Jasper 270J Model 270 Router Circle Cutting Jig
The Model 270 circle jig is a simplified version of the Model 200. This jig allows the craftsman to make 180 different size cutouts in 1/16" increments. The cutouts range in size from 7 to 18 3/16".Jigs Tools
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