Get 3 to 4 mm strips of glass epoxy sheet, and stick them together,like a photo frame, that works as well, or buy the extruded profiles used by picture frame makers.
Also aluminum window profiles will work.
As will CPVC window / door profiles, and wooden beading strips (many designs are sold, basically a router made profile).
The OP may have an excess piece of 8 mm sheet, thanks Mark for pointing out that the
material was of no practical use here for a screen mount.
Also aluminum window profiles will work.
As will CPVC window / door profiles, and wooden beading strips (many designs are sold, basically a router made profile).
The OP may have an excess piece of 8 mm sheet, thanks Mark for pointing out that the
material was of no practical use here for a screen mount.
When I cut the aluminium round covers for my labhorns I drew the circle on the ally then cut around it about 1mm away from the line.(bandsaw) Then used a piece of round ply as a guide and a straight router bit with bearing to give a good edge.
You can run a series of holes all around the inside of the cutout to remove the bulk, then use 4 bits of straight ply / mdf to make a guide for the router bit. This would just leave the 4 corners to file out.
Rob
You can run a series of holes all around the inside of the cutout to remove the bulk, then use 4 bits of straight ply / mdf to make a guide for the router bit. This would just leave the 4 corners to file out.
Rob
Hand power tools are very affordable now and can produce high quality results.
I suppose it depends on how much time you have to spend on your hobby (I have a lot less than I'd like) 😀
Rob.
I suppose it depends on how much time you have to spend on your hobby (I have a lot less than I'd like) 😀
Rob.
Cutting the hole and squaring the corners with a file is the easy part. Making the jig or template to route that hole exactly in the center is the tricky part, whether it is with a hand router or cnc.
The piece he is cutting the rectangle into has 4 holes in it. He just needs to screw/clamp some straight bits of plywood to it to use as a guide for a straight router bit to follow. It really isn't rocket science.
Rob.
Rob.
OP has gone quiet.
The procedure here in India for cutting plates for CNC work is that the X and Y edges have a 25 - 50 mm flat cut with a grinder, that is the reference point.
The plate is clamped, tool is set at that, and the cut started, this takes care of squareness, lack of straight and so on.
The machine is set to count the offset from the reference surfaces.
However, that does not answer the need for a 8 mm piece of Aluminum, there is no need for that, and finding suitable fasteners will be an issue as well.
The procedure here in India for cutting plates for CNC work is that the X and Y edges have a 25 - 50 mm flat cut with a grinder, that is the reference point.
The plate is clamped, tool is set at that, and the cut started, this takes care of squareness, lack of straight and so on.
The machine is set to count the offset from the reference surfaces.
However, that does not answer the need for a 8 mm piece of Aluminum, there is no need for that, and finding suitable fasteners will be an issue as well.