Jasper Circle Jig Model 400

Brand:| Model: MODEL 400
Product Video
If you’re a speaker builder, then you need this tool! Introducing the Jasper Audio Circle Jig precision router attachment. This jig converts your plunge router into a precision circle cutting device. The Model 400 will cut circles and mortises in 1/16" increments from 1" to 7-1/2" in diameter.
Part # 
Weight: 0.75 lbs.  
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Part # 365-255
Qty:  EA
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Product Details

Jasper Circle Jig Model 400

If you’re a speaker builder, then you need this tool! Introducing the Jasper Audio Circle Jig precision router attachments. These jigs convert your plunge router into a precision circle cutting device. The Model 200 will cut circles and mortises in 1/16" increments from 2-1/4" to 18-3/16" in diameter. Model 400 is perfect for tweeters and small midranges, cutting holes from 1" to 7-1/2". This makes it the ideal tool for creating highly accurate cutouts in custom built speaker cabinet baffles. Designed for use with MDF, plywood, particle board, solid woods and plastic sheet. Model 400 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. Made in the U.S.A.

Jasper Circle Jig Model 400
  • BrandJasper Tools
  • ModelMODEL 400
  • Part Number365-255
  • UPC673046004006
  • Product CategoryCircle Jigs
  • Unit of MeasureEA
  • Product Rating
    (24 Reviews)
  • Weight0.75 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

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Jasper Circle Jig Model 400
Jasper Circle Jig Model 400 is rated 4.125 out of 5 by 24.
Rated 5 out of 5 by from Great Tool !Great tool to adapt a router for cutting circles in cabinetry. The disk comes predrilled with mounting holes for many branded routers - see the hole pattern in the instructions at the Jasper website. There's also a router pattern on the back of the packaging card by brand name and model number. I have a small trim router, not shown in the pattern - and it also fit. The disk comes with a pre-mounted, removable calibration disk and 1/4" pin to ensure that the router centers to the disk when setup. And there are predrilled radius holes and a pivot pin provided to rotate the router/disk assembly around to cut a precision circle. Although it will cut a 1.5" diameter hole, I would prefer using a hole saw up to, say 2". But you definitely want to use this tool to rout the insets for the speaker rim at the proper depth on the baffle. The tool and router slide around the surface to be routed, so its best to perform any preferred router operations first before cutting the hole because you'll lose material for the tool and the router to rest on and slide smoothly. The M400 will cut holes up to 7.5 inches in diameter in 1/16th inch increments. You'll need something different for large diameter holes. For me, this is a giant leap from using a nail and string tied to a pencil method. Even if you use a compass to draw the hole, this tool provides an accurate pivot location to ensure a precision cut at whatever radius you set. A large or plunge router isn't required. From my perspective, a trim router is preferred - easier to handle. The PE price is right - I checked around, and the Jasper tech support people are very helpful should you need help for the setup. Highly recommended.
Date published: 2015-01-10
Rated 5 out of 5 by from Great Idea!This little baby really is amazing! I just made my cutouts over the weekend for a diy nearfields project that I am doing. I did the port, tweeter, woofer, and even the 1" hole for the speakon connectors and this thing did it all with amazing accuracy and speed. I used a 1/2" cutter for the insets of the speaks so the finished product will have the speakers flush with the face of the cabinet. Did that first, and then did the internal cut out with a 1/4" cutter like it is intended to be used with.A few things to keep in mind..1/2" is the widest cutter that will work with this jig. And that takes you right up to the internal edge of the jig. And you have to adjust the math when using the 1/2" obviously because all the pin hole measurements labeled on the jig are for the intended 1/4" cutter. No biggie..The pin supplied with the jig is very short and I didn't use it.. I used 2 extra 1/8" drill bits I had laying around. This extra length allows you to send the "pin" much deeper into the scrap wood below giving it a stronger more rigid pivot point. I used 2 layers of scrap wood below the actual piece I was milling. Using 2 1/8" bits allows you to set up both speaker faces on the workbench at once and you can do all the set and milling for BOTH woofers at once. Both tweeters at once, etc.. My logic was that this would make everything dead even from one speaker to the other.. Just my logic though, but it seemed to work.. :)Anyway, get this thing if you doing any speaker building. Also, Parts Express has the best price ANYWHERE on this thing. So cheap, you have no excuse not to buy it even if you are only doing one set of speakers..
Date published: 2014-03-24
Rated 5 out of 5 by from Beefier than you may think... but not perfectThis is made from a relatively thick acrylic, thicker than the base that would normally come with a router. It also has holes with 1/16" increments. It's great, and for what it is, works beautifully. My problem? It still broke. Yes. I somehow managed to chip off part of the outer edge making one of the holes unusable. But I was stupid, so I can't exactly ding the product for that. What I can ding it for are 1: I felt it was better to drill with a 7/64" drill bit rather than a 1/8" for stability, and 2: The little pin it came with to hold the jig to the wood may end up falling off the jig in either direction from the vibrations. It needs to be longer. Otherwise, it works beautifully.
Date published: 2012-10-31
Rated 3 out of 5 by from Works great butThe pin that comes with the jig is 3/4" long, after putting it in the jig there is ~ 1/2" protruding. If I am cutting 3/4" wood I need a pin long enough to stick into the material under the wood I am cutting. This is demonstrated in the video. The pin in the video is way longer than the one that comes with this jig. Anybody know where to get a longer pin?
Date published: 2012-10-20
Rated 5 out of 5 by from Did the trick.The device is easy to use, the mounting holes matched up perfectly with an old router I borrowed from my GF's Dad, and it enabled me to easily create a 1/8" deep recess and through hole for a bass port.I have the piano black (high gloss) cabinets from Dayton Audio and I used a Diablo 1/4" down spiral bit that produced a perfect top edge, leaving no chips on the gloss finish. That is a really good router bit, I bought it at Lowes.The Jasper guide is meant to work with a 1/4" (cutting diameter) bit. If you use any other size cutting bit you will need to perform math to find the correct guide hole.My only qualm is that lining up the hole on the guide with the center guide pin can be a pit of a pain when positioning on the actual piece to be cut. That however does not change the fact that I, who never used a router before, created 6 perfect circles on my first go.Recommended.
Date published: 2012-01-31
Rated 4 out of 5 by from Good, but the guide pin can fall outIt's good and unlike the prior review said it works great for cutting small holes in mdf. I've done under 2" diameter hole with no problem. If you try to cut all the way through mdf without taking your time you're going to have problems, but if you do 3 or 4 passes it'll be perfect. The only problem is the guide pin gets pulled out often if you dont drill your guide holes big enough. The instructions say 1/8" but you need to make them slightly bigger otherwise your pin will pull right out when you lift your router.
Date published: 2011-08-27
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Product Q&A

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Jasper Circle Jig Model 400

Can you tell me if this jig is compatible with the Black & Decker Model 7615 router?

Asked by: jgrove4005
That particular model is not listed on Jaspers site, but other B&D models are. I don't think they list every compatible model but I would recommend contacting them for a better answer for this.http://jaspertools.com/contact-us/#pagecontent
Answered by: MattP
Date published: 2015-01-06

I have  this jig, but I lost srews to attach it to plunge router DW621. Could you help me!? 

Asked by: Brundo
Unfortunately we do not offer these screws separately. You may be able to get them from Jasper, or from a local hardware store.
Answered by: MattP
Date published: 2014-10-27

will this fit the bosch 1617?

Asked by: jalng63
Unfortunately, I don't have a Bosch 1617 here to test. However, I have seen references online to this same question, and it appears that the Jasper jigs will, indeed, fit your Bosch 1617 router.
Answered by: RussR
Date published: 2011-09-07
  • 2015-03-27T08:40CST
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