Based on an earlier post I spent some time trying to determine how to calculate the screw penetration depth given the screw length. This is what I came up with:
Penetration Depth =SIN(RADIANS(75))*(ScrewLength-(0.073/SIN(RADIANS(75)))-0.48)
The formula is shown using Excel format, which also works for Google (Docs) Sheets.
This is the depth 90 degrees to the material surface - not along the angle of the screw, assuming that the Drill Bit Depth Collar is set by placing a U.S. nickel (5 cent coin) on the bottom of the jig base - between the bottom of the base and the tip of the drill bit. Note that this tip-to-base distance can vary considerably if you're using the Depth Collar guide on the jig (I have the K4 jig).
I checked the results of this formula against an earlier post that give depth as a function of screw length, and the results were close, but I think the method of using a nickel to set the Drill Bit Depth Collar provides a more predictable result.
ASSUMPTIONS
Ken
Tags:
Here is the formula for the horizontal screw travel distance from the point where the screw exists the pocket hole material - the point where the screw enters the material that receives the screw - toward the direction away from the Kreg Jig base fence.
HorizontalScrewTravel =(SIN(RADIANS(75))*(ScrewLength-(0.073/SIN(RADIANS(75)))-0.48))/TAN(RADIANS(75))
The distances are in inches.
Again, this formula uses Excel and Google Sheets format.
If you are end-joining material, and the HorizontalScrewTravel is greater than half of the thickness of the material that receives the screw, then screw is predicted to exit the material on the side opposite the Kreg Jig base fence.
For Technical Support, call 800-447-8638 or send a message. Reps are available Monday through Friday from 8am to 5pm (CST).
Started by Robert Melrose in Other Kreg® Products on Monday.
Started by Robert Wolf in Beginners' Zone. Last reply by KregRep 11 hours ago.
Started by Dan Smith in Beginners' Zone. Last reply by Glen S Apr 9.
Started by Bruno in General Woodworking. Last reply by Brad Martin Mar 24.
Started by Bruno in General Woodworking. Last reply by Glen S Mar 26.
The Kreg Project Center is great by itself, but 2 KPC's are better than 1 when you want to set up a 12 ft. work station in a couple minutes.…
ContinuePosted by Glenn Revheim on April 5, 2018 at 5:57am — 1 Comment
The first thing I will do is set price aside and focus on the tool and why I bought the Domino.
I have orders for a few dining tables and chairs. I have made one prototype chair, while I have all the tools to make angled…
ContinuePosted by justin waldron on April 2, 2018 at 5:46am
© 2018 Created by KregRep. Powered by
Badges | Report an Issue | Privacy Policy | Terms of Service