This step of the great rocket building caper involves the formidable task of sanding the myriad fins.
First, all of the edges get squared up, and laser/die cut marks removed.
My standard method of operation for this involves clamping a sanding block vertically in the shop woodworking vise. A sheet of plate glass provides a great bearing surface to slide the balsa stock back and forth against the block. This results in a perfect ninety degree edge on all surfaces.
The beverage shown is an additional essential requirement for this operation.
Tip: This is also a very efficient method for gang sanding stacked hand-cut fins so that they are of identical shape and size. I followed this procedure for the set of Big Bertha fins.
Next, a medium grit sanding block is used to round the leading and trailing edges of all the fins.
Finally, the components get a once-over with 400 grit sandpaper to smooth things out.
Here are all of the completed fins for six model rockets ready for assembly:
Moving on....
I like your technique of using the glass plate when sanding. I use two pieces of glass plate when I paper fins, to press the balsa/paper “sandwich”. I stack heavy weights atop the glass for 24 hours, until the glue (Mod Podge in this case) dries. With glass you know you get a nice smooth, and flat, surface. I’ll have to try your method for sanding.
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