topic Re: Guitar Fretboard help in Fusion Design, Validate & Document Forum

topic Re: Guitar Fretboard help in Fusion Design, Validate & Document Forum https://forums.autodesk.com/t5/fusion-design-validate-document/guitar-fretboard-help/m-p/5796865#M287362 I can think of several ways to do it and I'll mention each of them. Attached are a couple pictures and the exported design file for the 1st one. 1)<UL><LI>  I started a sketch on the YZ plane and drew a line 2mm below the Y axis (doesn't really matter where you do it though)</LI><LI>I placed a point and put a lock constraint on it so it wouldn't move</LI><LI>Then I put a center contraint on the line to that point. THis ensures it will stay centered as the dimension is changed.</LI><LI>Then I put a sketch dimension on the line and set the width at 2.25" (typical width at the end of a steel string acoustic fretboard</LI><LI>Next I drew two lines up 2mm to the zero Z axis (was just guestimating at how much of the sides is left after your radius the FB - I think it may actually be closer to 4mm though)</LI><LI>Then I put a 3 point arc which spanned from those two vertical lines, and then just guestimated the 3rd point for the height.</LI><LI>     Ideally, you would want to dimension this arc to something like 16" (Martin) or 12" (electric?), but Fusion 360 can't do that right now, and I have put in a request for this ability.</LI><LI>     So what I do is find and online calculator for arcs, enter the parameters for the width and radius of the arc, and it will tell you the height of the cord. Then you draw a vertical line of that length, and snap the arc 3rd point to that line</LI><LI>Note that with the sketch dimension on the width line, you can just edit that for different widths and model will adjust... BUT, then your curvature will be off.</LI><LI>Then I created an offset construction plane and selected this sketch I had just made, and set -25.4" for the offset (typical Martin scale length). Now that I think of it, that's wrong, you just want to use the length of your FB which is of course much shorter than the actual scale length.</LI><LI>Then I started a new sketch on that offset plane and repeated the same technique, just with smaller dimension (width of 44mm/ 1 3/4", typical Martin width at the nut</LI><LI>once those two sketches were made, I zoomed WAY out, and did create->loft, and selected both surfaces that are in the sketches. </LI><LI>That created a fingerboard with a slight arch and that narrows from the soundhole end to the nut end.</LI></UL>Not exaclty sure if that makes it a compound radious - I need to study up on that. Method 2: <UL><LI>draw a rectangle that is the outline of the FB blank.</LI><LI>push/pull that up for about 6mm/1/4" to get the thickness</LI><LI>create a sketch on each end of the FB shape, and draw the radius arcs on those. Make sure they are tangent to the top plane of the FB blank.</LI><LI>using the faces created by those arcs on the ends, push/pull them along the length to remove the material.</LI><LI>now create a sketch on the bottom plane of that solid, and draw in the taper lines from the nut to the base. </LI><LI>use push/pull to extrude the WASTE part of the trapezoid up and remove the material on the sides of the FB.</LI></UL>This is of course assuming you want the CNC machine to taper the FB for you too. You could I guess do all the other machining and then just taper it on a jig, but why have it do all for you? Then you could do some cool profiling on the upper frets as some builders do. Hope this makes sense? Tue, 01 Sep 2015 02:53:45 GMT fritter63 2015-09-01T02:53:45Z