JASPER 400 JIG

Manufactures product description: Originally developed and made for craftsmen who cut a wide range of circle diameters for custom audio speaker installations, the Jasper Model 400 jig add a new dimension to circular routing. We are very excited about our model 400 jig. It makes circles from 1 inch to 7 1/2 inches in diameter in 1/16 inch increments. We like to think of it as a universal hole saw. It can also be used in place of forester bits in many applications. It also makes a great guide. The Model 400 is made of cast acrylic 3/8 inch thick. It can be left on the router as a sub base. The Model 400 also mounts to 19 different plunge routers.

Details/Review

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Shipping & Packaging: Rating 5/5

 

Shipping & Packaging: Rating 5/5

 

I ordered the jig directly from the Jasper Company. It arrived within the same week via UPS and in excellent condition. The shrink wrapped package contained the Jig, pivot pin necessary mounting screws, and an instruction manual.

 

Construction: Rating 5/5

 

Construction: Rating 5/5

 

The circle jig is constructed entirely of a hard semi translucent plastic. The numbers on the jig are small, but clearly printed and easy to read.

 

Manual: Rating 4/5

 

Manual: Rating 4/5

 

The manual is very no frills; no photographs of the jig in action, only CAD drawings and small type font print instructions. The written instructions were very precise and easy to understand. After reading them, it appears to be a very simple jig to use.

 

Installation: Rating 5/5

 

Installation: Rating 5/5

 

It was SO nice not to have to run out to the big box store to get metric screws to mount this jig to my DeWalt DW621 router. The set of included screws actually included the two that I needed. fortunately for me, I did not need to remove the sub base of my router to use this jig, and as an added bonus, I can use the jig as a circular base plate as opposed to the ‘double D’ style that is standard on the DW621.

 

Use: Rating 5/5

 

Use: Rating 5/5

 

This jig will allow you to make circular pieces as well as cut circles. since I was in the middle of making a new drill press table and needed circular inserts this seemed like the perfect test. I measures the opening in my drill press table and set the pivot pin into the correct position (after adding 1/4″ to compensate for the diameter of the router bit). Next I drilled a 1/8″ hole in the center of the circle I wanted to cut out. This means that you will obviously end up with a 1/8″ hole in the middle of all your circular pieces. If that’s a problem then you may want to consider that when making your purchase. But for my purposes, it was just fine as the drill press will need a hole drilled into the center of each piece anyway. Once that was done then I set the pivot pin into the hole I drilled. At this point I realized that my workpiece was too narrow to safely operate this routing function. So I used another piece of similar thickness material and butted it up against the workpiece. That provided ample surface area to work.

 

Next came the routing operation. Here’s the photo sequence of the routing operation:

 

By step three I found that my left arm was far over extended, and I had to hold the router in place with one hand while I switch hand position on the router grips. then I could continue with the circular cut. I also noticed the cord was getting in the way and had to move it twice before completing the circle. I did end up with a nice clean circle and then it dawned on me that I should have simply routed half the circle in a counter clockwise direction to the point where my arm was extended and then the other half in a clockwise direction. I used this approach on the following circle and it eliminated any previous problems.

 

I took my test circle over to the drill press table to see how well of a fit I had. Unfortunately, it was about 1/8″ too small. No problem though, the Jasper Jig cuts in increments of 1/16″ so I simply adjusted the pivot pin an extra two notches and away I went into routing the next circle. this one fit perfectly, as snug as I could have hoped. I cut eight identical 3 5/16″ circles in less than 30 minuets.

 

Hint: When you attach the workpiece to a backer board, don’t use just woodworkers tape. Instead, countersink and screw the workpiece to the backer board. I had a few tense seconds where the tape came loose on the first circle routing!

 

Hint: If your router does not have a good built dust collection, then make sure you stop in the middle of the routing process to vacuum out the saw dust or you’ll run into trouble!

 

Value: Rating 2/5

 

Value: Rating 2/5

 

Any circle cutting jig is going to be pricey compared to what you can make at home, and at around $25-$35 this is no exception. But I will say that this jig is very well thought out and the added bonus of having all of the CORRECT metric screws was a real plus.

 

conclusion: 4.3/5

 

Overall a great product that does exactly what it promises. If you are not hung up on the price then it is a very worth while purchase.