UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Enlarging an existing hole in a steel chassis.

emeritus · 15th Mar 2021, 1:27 pm

Draw a circle of the correct size and position with a Sharpie (other permanent markers are available!) and use the file. I do have a set of circle templates that I use for this sort of thing but I also use anything circular of the right size (pipe offcuts, bottle tops) , or use compasses to draw a circle on a piece of card (corn flakes packets are of suitable weight) and cut out the hole. I have used a Swann-Morton No. 11 scalpel blade clamped in the drawing ink pen attachment of the compass of my geometry set for this.

15th Mar 2021, 1:27 pm	#2
emeritus Dekatron Join Date: Jan 2012 Location: Brentwood, Essex, UK. Posts: 5,346	Re: Enlarging an existing hole in a steel chassis. Draw a circle of the correct size and position with a Sharpie (other permanent markers are available!) and use the file. I do have a set of circle templates that I use for this sort of thing but I also use anything circular of the right size (pipe offcuts, bottle tops) , or use compasses to draw a circle on a piece of card (corn flakes packets are of suitable weight) and cut out the hole. I have used a Swann-Morton No. 11 scalpel blade clamped in the drawing ink pen attachment of the compass of my geometry set for this. Last edited by emeritus; 15th Mar 2021 at 1:36 pm.