Sunday, April 24, 2016

Still More Progress On The New Straight Midrange Horn Pair

Because the Lauan plywood is 1/8" thick, I can cut out the horn flare sides with a utility knife.  As in the Sound Transformer Bass Horns, the first two sides for each horn are trapezoids and fairly simple to cut even without a straight edge.  Here is an image of two of the trapezoids ready for fitting.  The only dimension that needs to be trimmed is the length.  Each end of the side needs a beveled edge that I can easy machine with a sanding block.


New Straight Midrange Horn With Two Trapezoids
New Straight Midrange Horn With Two Trapezoids
Here is a horn with trapezoids in position.


New Straight Midrange Horn And Two Trapezoids
New Straight Midrange Horn And Two Trapezoids


New Straight Midrange Horn And Two Trapezoids
New Straight Midrange Horn And Two Trapezoids
The next thing to do is to fit a corrugated cardboard pattern for the other two sides.  Here is the cardboard pattern being fitted by scribing, cutting, and sanding the edges until the pattern fits.


New Straight Midrange Horn - Fitting Cardboard Pattern
New Straight Midrange Horn - Fitting Cardboard Pattern
The cardboard pattern will be used to mark the first side on the Lauan panel.  The first plywood side will be cut slightly larger than the cardboard pattern for a more accurate fit than can be achieved with the cardboard.

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