Sharpening a scraper
David Parker has a point to make...
It is hard to beat a decent scraper for removing old paint, filler, glue or even rust and I’ve collected a box full of different designs over the years. I find the most efficient to be the Sandvik/Bahco types with the heavy duty carbide scraper blades. They come in various widths and the ones with the long blades can be sharpened with a diamond file with the blade still in situ.
However for precision work, like cleaning up those edge seams of epoxy, the small scrapers with triangular blades are perfect. The short edges on the blade, however, make them very fiddly to sharpen and replacement ones are expensive. They’re also not readily available and often have to be ordered online which doesn’t help much if you want to crack on and get a job finished quickly.
So here’s a simple homemade sharpening aid to keep these triangular blades in good condition. It basically consists of an old stick so it’s very cheap to make – I have used it effectively countless times.
Because they are triangular the blades can be rotated as they get blunt but eventually they need replacing. This blade is clearly now blunt, but in my local tool shop it was almost as cheap for me to buy a whole new tool as just get the blade.
Both sides of the stone are used to sharpen the blade and it can be honed to give a keen edge. If using a diamond sharpening stone, as shown here, remember to use oil or cutting fluid for the best results.
The blade can be sharpened just like a chisel if you remove it from the scraper. Here I’ve made a blade holder out of plywood with a shallow angled cut from a standard tenon saw in one end – it’s an ideal fit for the blade.