Snagged an IM-313 with a Vintage Norton HR-115 (11.5" Hard Ark)... Translucent with pink and butterscotch.
Here's a washita I just got from the bay. It is fairly dished as you can see from the pics. The last picture is after about 40 minutes of 60 grit sic on glass. I would've just lapped the other side instead but there's an even bigger issue on that side. I considered using my driveway but I'm scared of leaving deep gouges on the surface. Does anyone have a different method of lapping dished arks?
Two last comments about the stone. One, I was not expecting it to turn more brown with lapping, in fact I thought it would turn less brown. Lastly, does the stone look like it might've had a label on it in the past? Take a look at the second to last pic to see where I'm coming from.
Snagged an IM-313 with a Vintage Norton HR-115 (11.5" Hard Ark)... Translucent with pink and butterscotch.
View attachment 1183555
Another very similar stone arrived. Half of one of the 7x2" reversible combos... A rebrand, not Norton. Looks like 70s or 80s to me.
View attachment 1187802
View attachment 1187803
Here's a washita I just got from the bay. It is fairly dished as you can see from the pics. The last picture is after about 40 minutes of 60 grit sic on glass. I would've just lapped the other side instead but there's an even bigger issue on that side. I considered using my driveway but I'm scared of leaving deep gouges on the surface. Does anyone have a different method of lapping dished arks?
Two last comments about the stone. One, I was not expecting it to turn more brown with lapping, in fact I thought it would turn less brown. Lastly, does the stone look like it might've had a label on it in the past? Take a look at the second to last pic to see where I'm coming from.
I'll try 120 next sessioni would think you could control the depth of the gouges with pressure. Maybe try 120 sic. I know sounds counterintuitive but i just did the same thing with a heavily dished (~ 1/3 inch of dish) washita on 80 and 120 and 120 seemed to get me there. IIRC i saw that specific advice too recently which made me try it.
Does anyone have a different method of lapping dished arks?