12-24-2017, 01:18 AM
I took advantage of some middle of the night insomnia quiet to slowly read this topic. Several thoughts came to mind:
For the past eight years, I have sharpened primarily with a slow speed water cooled Tormek. Recently I have worked on converting a Viel and Kally 1SM belt grinders to variable speed. With surface feet per minute equaling the circumference of the drive pulley (D x pi) times RPM, I lowered the RPM of the Viel by about a third by switching to a four inch drive pulley similar to the 1SM pulley. The standard Viel drive pulley is six inches. The variable speed DC motor has a range somewhere around 700 RPM to an amount higher than 1725 RPM. I rarely use anything except the lower range. This speed is still above Mark's "speed of smell". Mark, I know you recently acquired a Gen III Viel, with smaller drive pulley and variable speed motor. Do you notice any difference between edge burr from your full speed Kally and the slower speed Gen III? What about with your Tormek? My question here is could there be a correlation with heat generated by higher speed grinding?
I did some testing with CBN wheels on a Tormek, used wet or dry. The wheels I used were steel D-Way with steel reducing bushings. I used Hone Rite Gold with the water to prevent rust. After reading about corrosion, I am wondering if routine use of Hone Rite Gold might be a good practice with either the Tormek or with water stones. I just watched a video with Rob Cosman using Hone Right Gold. I had not noticed him using it in earlier videos.
My third burr thought was with hand scrapers. When I was in my twenties, I met an elderly refinisher. He was a genuine expert who had apprenticed with an old Austro Hungarian cabinetmaker. He and his teacher were great believers in the hand scraper. Here, instead of trying to remove the burr, we use the burr to enhance scraping. The burrs (double) are formed by pressure, rolling a hardened rod over the edge. In skilled hands, the burrs can be quite large. When the burrs are longer usable, the scraper edge is ground away, back to "good", non fatigued steel.
I generally sharpen knives with the edge trailing. The factory configuration for the Tormek square edge jig for chisels and plane irons is grinding into the edge. Do those of you who sharpen with a belt grinder sharpen into or trailing the edge?
Ken
This is a fascinating topic.
For the past eight years, I have sharpened primarily with a slow speed water cooled Tormek. Recently I have worked on converting a Viel and Kally 1SM belt grinders to variable speed. With surface feet per minute equaling the circumference of the drive pulley (D x pi) times RPM, I lowered the RPM of the Viel by about a third by switching to a four inch drive pulley similar to the 1SM pulley. The standard Viel drive pulley is six inches. The variable speed DC motor has a range somewhere around 700 RPM to an amount higher than 1725 RPM. I rarely use anything except the lower range. This speed is still above Mark's "speed of smell". Mark, I know you recently acquired a Gen III Viel, with smaller drive pulley and variable speed motor. Do you notice any difference between edge burr from your full speed Kally and the slower speed Gen III? What about with your Tormek? My question here is could there be a correlation with heat generated by higher speed grinding?
I did some testing with CBN wheels on a Tormek, used wet or dry. The wheels I used were steel D-Way with steel reducing bushings. I used Hone Rite Gold with the water to prevent rust. After reading about corrosion, I am wondering if routine use of Hone Rite Gold might be a good practice with either the Tormek or with water stones. I just watched a video with Rob Cosman using Hone Right Gold. I had not noticed him using it in earlier videos.
My third burr thought was with hand scrapers. When I was in my twenties, I met an elderly refinisher. He was a genuine expert who had apprenticed with an old Austro Hungarian cabinetmaker. He and his teacher were great believers in the hand scraper. Here, instead of trying to remove the burr, we use the burr to enhance scraping. The burrs (double) are formed by pressure, rolling a hardened rod over the edge. In skilled hands, the burrs can be quite large. When the burrs are longer usable, the scraper edge is ground away, back to "good", non fatigued steel.
I generally sharpen knives with the edge trailing. The factory configuration for the Tormek square edge jig for chisels and plane irons is grinding into the edge. Do those of you who sharpen with a belt grinder sharpen into or trailing the edge?
Ken
This is a fascinating topic.