Jasper 400J Model 400 Router Circle Cutting Jig
by Jasper Tools
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List Price: Our Price: $26.62 You Save: $8.32 (24%) Availability: Usually ships in 24 hours Category: Tools See more product details |
Product Details
Manufacturer: Jasper ToolsModel: 400J
Product features:
- Router circle cutting jig ideal for the speaker maker
- 120 different size cutouts in 1/16-inch increments
- Made from 3/8-inch thick cast acrylic
- Designed for smaller speaker cut-outs, tweeters and midranges
- 7- to 18-3/16-inch cutout range; 1- to 7-1/2-inch holes
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Tools and Hardware Reviews of Jasper 400J Model 400 Router Circle Cutting Jig
Customer Review: The jig works but...
Summary: 3 Stars
The 400J circle jig works as advertised but it suffers from a few design flaws, one of which had me cursing within seconds.
The jig screws onto the base of your router in place of the router's normal base plate. It pivots on a little 1/8" pin that you insert into the hole in the jig that corresponds to the diameter of the circle you want to cut. So drill a 1/8" hole in the workpiece (with a drill press to ensure vertical), insert the pin in the jig, position the router+jig so that the pin fits in the hole you drilled and cut your circle. Simple.
Problem #1: The pin holes in the jig go all the way through. These pin holes are not as snug as the 1/8" holes I drilled. The upshot is that the pin has a tendency to simply push through the jig rather than down into the hole. If you have a vacuum attachment on your plunge base, this means you'll probably have to remove the attachment in order to retrieve the pin. Since the jig is made of soft plastic, I figure this problem will only get worse as the pin holes see additional wear. Guess you could use a slightly larger drill bit for the hole (5/32 or maybe 9/64).
Problem #2: This is the one that had me cursing. As mentioned, the jig screws to the base of the router and pivots on a little pin set to the size of the hole you want to drill. This means that the router itself rotates 360 degrees as you progress around the perimeter of the circle. So if you can't walk around your workpiece, you'll have to take your hands off the router at some point. Worse, if you're using a vacuum attachment, you're going to be fighting with the vacuum hose which probably won't like being forced to twist. Grrrr.
A -much- better design would be to use a bushing or to require a pattern bit (one with a bearing near the top of the bit as opposed to a flush trim bit with the bearing at the tip). The bushing or bearing fits into a center hole so that as the jig pivots around the 1/8" pin, the router itself maintains the same orientation with respect to the operator.
The 400J itself won't allow this since it has that weird cutout at the center. I think I'm going to glue a piece of 1/4" acrylic to the top with a hole for a bushing. That way the jig itself will be free to pivot and I'll be able to maintain a constant router orientation without offending my vacuum hose. Oh, and this also solves problem #1 since it would prevent the 1/8" pin from pushing completely through the jig.
So, 3 stars since the jig does work as advertised but there's plenty of room for improvement...
Description of Jasper 400J Model 400 Router Circle Cutting Jig
The Jasper Router Circle Cutting Jig is ideal for the speaker maker. Designed primarily for making smaller speaker cut-outs, particularly for tweeters and midranges, it can also flush mounting speaker drivers. Converting a plunge router into a precision circle cutting device, the jig allows the craftsman to make 120 different size cutouts in 1/16-inch increments. The cutouts range in size from 7-to-18-3/16-inches. Perfect for tweeters and small midranges, it cuts holes from 1-to-7-1/2-inches. Manufactured from cast acrylic 3/8-inch thick, the jig can be left on the router as a sub base, and be used with MDF, plywood, particle board, solid woods and plastic sheet. Made in the U.S.A., this circle cutting jig mounts directly to the base of 19 different models of plunge routers including Bosch 1615, DeWalt 621 and 625, Freud FT2000E, Hitachi M8V, TR12 and M12V, Porter Cable 690 series and 7539, Skill 1823 and 1835, and all Sears, Ryobi and Makita models.The Jasper Router Circle Cutting Jig is ideal for the speaker maker. Designed primarily for making smaller speaker cut-outs, particularly for tweeters and midranges, it can also flush mounting speaker drivers. Converting a plunge router into a precision circle cutting device, the jig allows the craftsman to make 120 different size cutouts in 1/16-inch increments. The cutouts range in size from 7-to-18-3/16-inches. Perfect for tweeters and small midranges, it cuts holes from 1-to-7-1/2-inches.
Manufactured from cast acrylic 3/8-inch thick, the jig can be left on the router as a sub base, and be used with MDF, plywood, particle board, solid woods and plastic sheet. Made in the U.S.A., this circle cutting jig mounts directly to the base of 19 different models of plunge routers including Bosch 1615, DeWalt 621 and 625, Freud FT2000E, Hitachi M8V, TR12 and M12V, Porter Cable 690 series and 7539, Skill 1823 and 1835, and all Sears, Ryobi and Makita models.
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