This is almost a blog post by proxy. John specifically asked me to put this little tip for marking up a stainless steel sheet before cutting it on a guillotine.
If you use a piece of copper when marking your stainless steel sheet, you’ll find that it doesn’t scratch the stainless underneath the protective plastic coating. Essentially it allows you to cut the plastic and mark your cutting line.
You can use anything from a two pence piece to a strip of copper that you’ve cut to a specific width.
Here’s one John made earlier:
I know it doesn’t look anything special, but you can just run it down the side of the sheet to get a perfectly straight line in a couple of seconds.