I think I have asked this question before but didn't get a straight answer. I have a sorby jig for grinding my Elsworth bowl gouges. It is set up 2" from the wheel. As the wheel is ground down, what happens to the grinding angle of the tool?? Do you change the depth in the jig? When do you need a new wheel??? Gretch
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grinding wheel life
- Thread starter Gretch Flo
- Start date
john lucas
AAW Forum Expert
Gretch Later tonight I'll post my jigs to compensate for wheel wear. It really doesn't matter much, it changes the nose angle and wing angles slightly as it changes but you won't notice it as you turn.
To compensate I made myself some simply wooden pieces that fit in the V of the Oneway jig and touch the wheel at 2 places. If I have move the Oneway arm for other sharpening or if the wheel wears you just put this jig in the V and readjust the arm until the 2 points on the jig touch the wheel. Then it is adjusted to give you exactly the same grind as before.
To compensate I made myself some simply wooden pieces that fit in the V of the Oneway jig and touch the wheel at 2 places. If I have move the Oneway arm for other sharpening or if the wheel wears you just put this jig in the V and readjust the arm until the 2 points on the jig touch the wheel. Then it is adjusted to give you exactly the same grind as before.
Steve Worcester
Admin Emeritus
I like Johns idea, but the Geiger arm will allow the movements front and back and up and down.
But yes, if you didn't move anything, as the grinding wheel got smaller, the nose and wing angles would get steeper.
But yes, if you didn't move anything, as the grinding wheel got smaller, the nose and wing angles would get steeper.
compensation??
Would extending the tool in the jig, say 2 1/8 inch rather than 2 " compensate??? Gretch
Would extending the tool in the jig, say 2 1/8 inch rather than 2 " compensate??? Gretch
The change happens so slowly that you don't even notice it, so I wouldn't worry about it. When you do get a new wheel, it may take a bit to get the whole surface of your tool to grind (you go from a slightly more blunt angle to a flatter one), but it is a minimal amount. If I used standard grinding wheels, I would go through a couple a year. I use a special CBN (cubic boric nitride which is a material) wheel, and my rough one (80 grit) has lasted almost 4 years with very little wear. The down side to these wheels is that they cost about $300 for a 1 by 8 inch wheel. Using stop blocks or spacer blocks is a good way to return to reset angles
robo hippy
robo hippy
john lucas
AAW Forum Expert
Gretch Sorry it took so long. I forgot. This is the jig I use to set the Oneway arm for the bowl gouges. If I readjust it to do some other tool or if the wheel wears it allows me to exactly duplicate the setting everytime. I made a set of these for my spindle gouges and also several to set the flat tool rest to the proper angle for my scrapers, Stewart Batty grind and few other uses.
Attachments
Johns' photo
Thanks John, Gretch
Thanks John, Gretch