Sharpening Primer 2016 by Dictum

More catalogs by Dictum | Sharpening Primer 2016 | 23 pages | 2016-09-09


Page 12 of Sharpening Primer 2016

tools japanese blades can be trued on diamond blocks no 705382 or using a steel lapping plate no 713600 and silicon carbide powder no 713603 or no 713604 for sharpening tools the same types of stones used for knives are sufficient chisels and plane blades for chisels and plane blades to work effectively their backs have to be absolutely flat the back of new tools is often not 100 even or still shows traces of grinding from the manufacturing process to obtain a sharp cutting edge the back must be smoothed depending on how deep the grinding traces or how even the back is it may have to be roughened first western chisels and plane blades can be trued on a diamond block e.g no 705358 in which case it is sufficient to true the first two-thirds of the back after that the back is ground further with finer grit stones and honed with the finest sharpening stone on the lapping plate the blade is worked with silicon carbide powder and water under high pressure for easy pressure distribution a piece of wood will serve best the powder grinds into a fine paste that has an additional polishing effect the back is normally only trued once on brand-new tools using flat trued hones after that the back is only honed on a fine sharpening stone sharpening the bevel subsequently the blade‘s bevel is sharpened at an angle between 23° and 40° depending on the tool‘s purpose for checking the bevel angle we recommend using a bevel gauge for tool edges no 707261 or a mini protractor no 717141 1 2 • • • • • lay the back onto the sharpening stone at a 90° angle to the long side of the stone choose a fixed point on the neck up to which you want to sharpen move the blade back and forth on the stone applying light pressure and guiding it with your fingers shiny areas indicate the even parts of the back while the darker areas have not yet had contact with the sharpening stone pay particular attention to the front section near the cutting edge approx 3 mm and the edges pre-sharpen on the 1000 grit stone and finish on the 6000 grit stone until all scratches are removed 22 1 2 the smaller the bevel angle the lower the cutting resistance and the more delicate the cutting edge determining the optimal bevel angle is a process that depends on the type of wood the cutting method and the quality of the tool‘s steel several trials may be required the angle table at the beginning of these instructions serves as a guideline low cutting resistance high cutting resistance 23