Edge sharpness tester

This is my version of an Edge sharpness tester

This is based on the popular BESS Edge-On-Up Industrial edge tester. It is used to test the sharpness of knives, razors and any other edged tools.

The original uses a regulated filament for edge testing, but I just use very thin 0.165mm monofilament fishing line and a double-edge shaving razor as my calibration value for cutting, and I use a very accurate digital pocket scale for measurement.

Make sure the fishing line is not pulled tight between the 2 locking screws, a tight or stretched fishing line will affect your measurement and make it inaccurate. Always keep a little bit of slack in the line between the 2 locking screws when testing your edge. Carefully and very slowly push your edge down onto the line while looking at the scale to see at what value it cuts the line. Slow and careful is important for an accurate value.

Parts required:

2 x M4 Brass threaded inserts (max 5mm long).
2 x M4 Thumb screws (1 needs to be no