When i was a maintenance sparky in an engineering environment , they had a few surface grinders. They all aimed the coolant at the back of the job in hand I.E coolant dragged around the surface being ground. They were pro's.

Steve.

I always aim the coolant between the wheel and the workpiece , and use a nozzle that covers the entire wheel width. So I don't use the round nozzle from the lockline kit but use the wide blade type and modify the width etc to create the fan I need to suite the wheel and the job. Surface or Cylindrical, it is the same basic principle. Internal wheels are alot more difficult to aim the coolant correct. And like all have said, the direction of the wheel drags the coolant with it. Grinding, it is important to have a good filter and supplying clean coolant. Often bad surface finishes come from contaminated coolant that gets between the wheel and the workpiece, and will leave either a radial line like a mini gouge line or on the surface, will leave a line corresponding to the piece of junk that either went through while grinding, or got stuck onto the wheel and it keeps repeating this short marks of a deeper grinding score. Looks like a newly dressed wheel that was not cleaned after dressing look.

Excellent reference, John … Thanks

It’s good to see presentation to that standard amongst all the dross on t’internet.

MichaelG.