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Thread: Kreg / It's all geometry
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19th April 2015, 03:34 PM #1rrich Guest
Kreg / It's all geometry
When using pocket screws, the objective is to have the screws exit the work piece approximately in the center.
So if you are working with a 51 x 51 piece of timber, the tip of the Kreg bit should exit the timber at about 25 MM from the face. For this, the cheap drill guide can be used. The trick is to position the drill guide further up the timber or away from the end. It may be necessary to drill the holes in two steps. The first step is using the drill guide and the second to complete the hole to the appropriate depth.
In no way do I endorse the Kreg for fine furniture. For some of the tasks in the shed, the Kreg may be acceptable.
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20th April 2015, 02:13 PM #2
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Excellent, using the above information and also that Kreg jig set the angle at 15 deg from vertical. one can work out all the geometries needed.
For example, the drill will should enter the work piece at 25.5 / tan (15) = 95.17 from the edge of the work piece.
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20th April 2015, 03:37 PM #3rrich Guest
Thanks, I didn't know the 15° and couldn't go into the shop to measure.
All
The Tangent of 15° is 0.2679 according to CRC Abridged Mathematical Tables.
For the algebraic challenged, just divide HALF the thickness of the timber by 0.2679 and you have the entry point.Last edited by Christos; 1st May 2015 at 09:33 PM. Reason: To add a word
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22nd April 2015, 04:44 AM #4rrich Guest
It should be HALF the thickness of the timber.
Originally Posted by rrich
Maybe one of the Moderators could edit the post to correct my error. I wouldn't want someone to the original formula and ruin a project.
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