"See-Through" slotted grinding discs.

[graham-xrf]

I know they exist, but I lost the link to them.
Apparently used horizontally, and the tool being ground on offered up from underneath, and viewed through the spinning slots from above.
Possibly may be combined with angle-set jig aids.

1. If anyone has experience of these - do tell.
2. Are they any good - i.e. worth having and using?
3. Are they reasonably priced?
4. What are they even called (generic name if possible)?

 

[ddillman]

Wurth or McMaster carr

5606A22

 

[brino]

I have only seen and used them on my WorkSharp machine like this:
https://www.worksharptools.com/product/woodworking-tool-sharpener-ws3000/

The view thru them is about what they show in the fourth picture down in the link above.

The wheel is here:
https://www.worksharptools.com/product/edge-vision-wheel-ws3000/

I have not used it extensively, but tried it and it did work.
I usually use the machine with the glass wheels from the top.....

-brino