Hello, a quick question from a relative newcomer. I am in the process of making some “Cornhole” platforms for a pig roast i am throwing. It calls for a six inch diamter hole near the back end of it. I want to make a jig so I can make a bunch fairly easisly. The template will be the same size as the board 24×48. The template will be made out of 1/2 MDF and then use a router with 5/8 inch guide bushing and straight cutting router bit to make all the holes. My questions is this? How do i calculate how big of a hole I need to make in my jig. I assume its bigger because of the guide bushing. But how much bigger? What variables do I need to consider when making this jig? Any help is appreciated.
Kenney
Replies
This subbase is machined to make a 6.00" hole should you decide on that rout. Should the templet guide be your choice then make the templet hole = 6" + 2(the difference between cutter and collar). Example, with 1/2" cutter and 5/8" collar guide,
6+ 2(1/8) = 6-1/4".
Routers
Um. I hate to correct ya, but the offset should be the difference between the bit and bushing.
For template work, you usually offset 1/2 the difference between bushing and bit (1/2 of 1/8 = 1/16). But since he's cutting all around the bit/bushing he needs full offset.
Template should have a 6-1/8" Diameter hole, since the bushing provides only a 1/16 offset each side of the cutter.
If i've confused things (it reads weird to me, now...) think this: if you slip the bushing into a 5/8 hole, you get a 1/2" hole...
The older I get, the better I was....
Clearly my arithmatic is wrong, tx for catching that. Big enough MDF mess the fellow is going to encounter, he need not have an addition/subtraction error on top of that.
perhaps an easy way to look at it is that in normal template work, you are taking he distance from the edge of the bit, to the outside of the guide... this is a difference in "radius" -- so 1/2(5/8-1/2) = 1/16" with the 5/8" and 1/2" representing guide and bit "diameters".
When you template for a full circle (or any partial circle =>180º, or simiilar two-sided template routing such as a square, rectangle, ellipse)... you are now talking about a diameter difference, or 2-times the radius. 2x 1/16"=1/8" (or just the diameter difference between the guide and the bit)
Thats a good way to explain it.
I've never had a problem figuring it out for my own work, but explaining it so that someone else knows what I mean... that's another story.The older I get, the better I was....
"Cornhole" platforms for a pig roast.. I have NO idea what that is BUT surely a FIRST in this form...
Good luck with your "Cornhole" thing.. Yank here so not well educated in Pig roasts... LOL...
EDIT:: I just loved this post... Made my whole day... I'm so happy...
Edited 7/7/2005 2:30 pm ET by Will George
6" cornhole.
Hmm.
Ouch.The older I get, the better I was....
Believe or not there is an ACA "American Cornhole Association". Anyways it is the new craze in yard games taking the place of horseshoes in many instances. It is also called Baggo I think. Anyways, got any ideas on making this template that has not been mentioned already?
Kenney
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