- Joined
- Aug 12, 2014
- Messages
- 233
If you are going to try the mousepad method make sure to use very light pressure as anything more may just end up rounding the apex off. You could also use a piece of paper towel under it also, less flex but still the sandpaper itself will flex a little bit. That being said, I'd actually recommend using a waterstone/diamond plate/Norton Crystolon for convexing. This allows you to use more pressure without fear of rounding the apex and gives a greater degree of accuracy IMO.
Basically you'd just start grinding away at the shoulder where the primary and secondary (edge) grinds meet, it will still end up convex using a flat grinding surface as it's literally impossible to hold the same angle grinding freehand. You can get more or less curvature to the convex by simply rocking your hands more or less, which seems daunting but you really get a feel for it pretty quickly. Murray Carter has some great videos on grinding convex using waterstones on his youtube channel.
Thanks for your help I will certainly will look at the videos