Thursday, July 21, 2016
Estes Red Max Build, Part 4, Fins Prep
I would think - the harder the wood, the harder it is for the laser to cut through it. The top cut was burnt and wide. The cut didn't go all the way through to the bottom.
I took some passes with a sharp knife to get through it.
I don't mind hard balsa fins, They'll hold up better on a hard landing.
With laser cutting there is no real need to gang sand fins to get them all the same shape.
Hand cut fins should be stacked and gang sanded to get them a consistent shape. With laser cutting, you draw one then copy and paste it two or three more times. It's the same fins profile over and over.
When sanding off the burnt edges at a 90 degree angle you can see the wedge angle of the laser cut.
I've read instructions where you are told you can leave the burnt edges as is. They say glue will still hold on the charred edge.
Not me. I remove it and square up fin edges with 220 grit on a sanding block.