Why vertical or horizontal?

[Titian]

To sharpen towards or away from the direction of travel is the question? Sorry if this is obvious for those with a Tormek machine but this question is from a non Tormek user.

With some jig's recommend for use with the tool rest in the vertical position and as a consequence the direction of rotation turns into the tool edge. Which I'd class as the normal direction for grinding to avoid a feathered edge.

While other jigs are specified for the tool rest in the horizontal position so the stone moves away from the edge of the tool. Which is the direction normally used for honing so the tool doesn't dig into the wheel.

So what is the reason for using vertical or horizontal with the Tormek system? Is it better for the tool or user, is feathering not an issue or some other esoteric Tormek reason or just a pragmatic works best?

Thanks again for any replies.

[Herman Trivilino]

When the grindstone turns towards the tool it grinds faster. When it turns away you have more control. I very rarely have the stone turning away from the tool.