> Pietenpol-List: formula for arc for instrument panels and
Posted: Sun Aug 15, 2004 8:26 am
Original Posted By: Isablcorky(at)aol.com
Man...you guys get complicated...Not being the mathmatician type I just followed the idea in plans...In the center bottom of page one Bernie shows how to lay out the radius for the instrument panel by useing a 12 3/4 inch radious. I think he uses this same radius for all the upper panels....To raise my turtle deck 1 1/2" I layed out the width and height I wanted and a centerline on my plywood... I marked a point on the C/L 12 3/4" ( Bernie's radius) minus the 1 1/2" that I wanted to raise the deck. Then I measured from the pivot point to the width marks ...marked this dimension on a stick of wood and drilled drilled two holes ,,,one for a pencil point and the other for a nail and swung the arch. I might have had to play with the pivot point slightly to get it touch all three point( I don't remember) ( it's probably that old timers disease(sp) again) But for the non mathmaticians out there this backwoods method worked out perfectly for me and the radius of the panel LOOKS just right..... Ed G>From: "Dennis Engelkenjohn" >Reply-To: pietenpol-list(at)matronics.com>To: >Subject: Pietenpol-List: formula for arc for instrument panels and >turtledeck curves>Date: Sat, 14 Aug 2004 11:49:05 -0500>>I had been trying to figure out how to lay out the instrument panels and >turtle deck curves for a while, but couldn't figure out the radii, >especially when there were changes in width of the arc or height of it. >Actually, I have been wanting a formula to do this for some time.> One of the nail benders at work last week knew the formula and he >shared it with me. Works like a charm. it is:>the width of the arc squared plus the height of the arc squared, divided by >the width of the arc.> I drilled a 1 X 2 out for a round pencil and cut a slot so it would >fit snugly then just drove a finishing nail through the 1 X 2 the distance >from the point to the correct radius. Works great and is free!>Dennis________________________________________________________________________________
Man...you guys get complicated...Not being the mathmatician type I just followed the idea in plans...In the center bottom of page one Bernie shows how to lay out the radius for the instrument panel by useing a 12 3/4 inch radious. I think he uses this same radius for all the upper panels....To raise my turtle deck 1 1/2" I layed out the width and height I wanted and a centerline on my plywood... I marked a point on the C/L 12 3/4" ( Bernie's radius) minus the 1 1/2" that I wanted to raise the deck. Then I measured from the pivot point to the width marks ...marked this dimension on a stick of wood and drilled drilled two holes ,,,one for a pencil point and the other for a nail and swung the arch. I might have had to play with the pivot point slightly to get it touch all three point( I don't remember) ( it's probably that old timers disease(sp) again) But for the non mathmaticians out there this backwoods method worked out perfectly for me and the radius of the panel LOOKS just right..... Ed G>From: "Dennis Engelkenjohn" >Reply-To: pietenpol-list(at)matronics.com>To: >Subject: Pietenpol-List: formula for arc for instrument panels and >turtledeck curves>Date: Sat, 14 Aug 2004 11:49:05 -0500>>I had been trying to figure out how to lay out the instrument panels and >turtle deck curves for a while, but couldn't figure out the radii, >especially when there were changes in width of the arc or height of it. >Actually, I have been wanting a formula to do this for some time.> One of the nail benders at work last week knew the formula and he >shared it with me. Works like a charm. it is:>the width of the arc squared plus the height of the arc squared, divided by >the width of the arc.> I drilled a 1 X 2 out for a round pencil and cut a slot so it would >fit snugly then just drove a finishing nail through the 1 X 2 the distance >from the point to the correct radius. Works great and is free!>Dennis________________________________________________________________________________