I have a project where I need to cut a really difficult shape through a 3/4" board at a 42-degree angle. The difficult shape is a stair handrail that intersects the board at a 42-degree angle. The handrail needs to pass through the board. I am having a very difficut time trying to figure out how to cut the "hole". Basically it is a mortise but the shape of the mortise is the profile shape of the handrail but needs to all be cut at the 42 degree angle. This is not a rectangular through mortise but the odd shape of the handrail.
I was thinking I could cut this mortise on my scrollsaw with the table tilted to 42-degrees but the problem is when following the sketched profile of the handrail the top portion is angled correctly but when getting to the 180-degree (bottom) cut it is angled the opposite direction. This is because the workpiece is turned to follow the cut line. Would this be something for a jigsaw where the tool is turned as opposed to the workpiece?
I have been Googling for a solution but trying to describe what it is I am wanting to accomplish has not produced the search results I am looking for.
Thanks,
Mike