chisel with 25 degrees in repeatable accuracy

[Werner Küspert]

I want to sharpen a large number of chisels at an angle of 25 degrees.
Does anyone have any advice on how I can set this angle for each chisel with repeatable accuracy?

[RichColvin]

Werner,

I worked with a number of people on this forum to design a jig for this which can be 3D printed.  Information about it is at: https://sharpeninghandbook.info/Jigs-ProjectionTTS-100.html.

Kind regards,
Rich

[John Hancock Sr]

Once you set the bar height for the first one make a note of the protrusion and set them all with the same protrusion.

[MikeK]

Once you set the bar height for the first one make a note of the protrusion and set them all with the same protrusion.

That's what I do and how I was taught by the late David Charlesworth.  I have the Tormek T8 (David had the T7) with the DC-250 diamond wheel and SE-77 jig.  The bar is 9mm above the wheel and the projection is 38mm for a 25-degree hollow ground bevel.

I use a 5mm and 4mm Domino tenon glued together for the 9mm spacer to set the bar height.  This works for all chisels and plane irons and has never failed to produce consistent results.