06-13-2009, 02:34 AM
I think you are trying to cut two 1/4" diameter semicircles in a sheet of styrene.
Here is one way:
Get a 6" piece of 1/4" O.D. steel tubing. Sharpen the tubing as sharp as possible
on the inside with a tapered reamer and a jeweler's file. With a dremel, remove
half the tubing diameter about 1/2 " length from the end so you have a sharp tool looking like
a sort of gouge. Clean upand get sharp as you can then tap this into the sheet plastic.
When you get it cut through then remove the semicircle with a straight cut, Xacto, etc.
If you have all this on hand it is a very easy tool to make. The tubing could be a piece
of steel brakeline or...? Any hydraulic shop would give you a scrap piece.
Here is one way:
Get a 6" piece of 1/4" O.D. steel tubing. Sharpen the tubing as sharp as possible
on the inside with a tapered reamer and a jeweler's file. With a dremel, remove
half the tubing diameter about 1/2 " length from the end so you have a sharp tool looking like
a sort of gouge. Clean upand get sharp as you can then tap this into the sheet plastic.
When you get it cut through then remove the semicircle with a straight cut, Xacto, etc.
If you have all this on hand it is a very easy tool to make. The tubing could be a piece
of steel brakeline or...? Any hydraulic shop would give you a scrap piece.