Sharpening Angle Using WM-200
Good morning.
I’m having real difficulty getting an accurate angle on my chisels using the WM 200 angle master. I have the T4 sharpener and I’m setting the angle according to the written instructions and having watched instruction videos online.
I have removed the grindstone wheel to measure it accurately which is coming in at just short of 190 mm diameter. I have set this on the angle master and brought the T4 into a light room to ensure that it is resting correctly.
At the end, when I use my Veritas bevel gauge, the angle is showing closer to 30° than the 25 that I intended to sharpen at. I have attached a photograph showing the angle master at the point when it was set before sharpening.
If you can offer any advice, I would be very grateful.
Kind regards,
Nick.
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Hej Nick
Your angel at the tip is 25 degrees, but the bevel behind increases to 26,9 degrees.
The reasons are as follows:
- When sharpened on a flat surface you have a flat bevel with 25 degrees all the way to the heel, when you sharpen on a round stone you'll get a hollow grind.
- The effect increases the smaller the diameter of the stone is and as longer the bevel is.
- Even the 25 degrees messured before sharpening can increase, the protrution of the chisel is shorter after sharpening, this increases when you chisel is heavily damaged and you have to remove alot of steel. Therefor you should readjust the tool inbetween the sharpening when you remove quite a lot of material, that accounts to all methods.
The only way to avoid it is to sharpen on a flat surface, eg. with a MB-102 Multibase on the flat outside of a Tormek Diamond Wheel.At the end it has no influence on your work because the tip angel is 25 degrees.
The Veritas Bevelgauge is to measure tools when sharpened on a flat surface and our WM-200 is for measure tools on round surfaces.
See also enclosed the drawing: