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  Topic Review (Newest First)
03-31-2012 10:14 AM
harrysin
Quote:
Originally Posted by black3000gt View Post
I have been trying to make a jig today to cut a 7.5"x2.5" recess in a 8.5"x3.5" piece. I figured that since my router base is 6", i just add that to my length and width and that would give me the size I need. Then I realized I was not taking into account the size of the bit i was using. I am using a 1/2" bit so I subtracted that from my measurement and it still isn't quite right. Any tips would be great. Thanks!
This is how I rout a recess using a template and guide. To calculate the size of opening in the template, guide dia. minus bit diameter plus the size of the recess.
If you used a 1" guide and a 1/2" bit, then: 1-1/2+7.5=8"...1-1/2+2.5=3"
so, a template with a cut-out measuring 8" x 3" using a 1" guide and a 1/2" bit will give you the required size of rebate. The first shot shows the easy way to make a template with an accurate cut-out.
03-30-2012 11:45 PM
The Warthog You may have taken the whole " diameter of the bit away from the edge of the jig. In fact, if your baseplate is 6" and the bit is ", then the edge of the baseplate is 2 3/4" from the edge of the bit. That is, 3" from the centre of the baseplate and bit to the edge of the baseplate, minus " from the centre of the baseplate to the edge of the bit. Your stop block needs to be 2 3/4" from the edge of the planned recess. Measure this with a ruler before you set out the edges of your jig.
03-30-2012 11:36 PM
black3000gt
Please help me make a jig.

I have been trying to make a jig today to cut a 7.5"x2.5" recess in a 8.5"x3.5" piece. I figured that since my router base is 6", i just add that to my length and width and that would give me the size I need. Then I realized I was not taking into account the size of the bit i was using. I am using a 1/2" bit so I subtracted that from my measurement and it still isn't quite right. Any tips would be great. Thanks!

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