Originally Posted by nemesis256
Why is this? I've seen people recommend both, and I find having the base towards me more comfortable. Easier to push the guide instead of pulling it.
Isn't using a file going to take off a lot more material? Do you only do this because you race? I've seen most people say they only use a file for setting and edge, and diamond stones for sharpening/polishing. I'm not doing any racing.
No Matter how smooth you get the edge, if you look at the surface under intense magnification you will see surface roughness. The surface roughness is directional after going with a diamond file, the file will have more impact on the rough areas it directly goes against (to smooth them out) on the front side, than it will on the back side. As you remove even small amounts of material you expose more of the rough parts. Leaving the sharper edges that will have more impact on your speed while on edge if you go from tail to tip or back and forth.
Magnified 1000 times after 2 passes of 100, 200, 400, and 600 grit diamond stone in same direction (no file work done). (the arrows are not the direction of movement, they in the opposite direction of the stone, they were pointing out drag points if the ski was going the opposite direction)
1000 times after 2 passes with finishing file forward, then (1 forward, 1 back) 100, 200, 400, and 600 with diamond stone. This image has drag points are in both directions.
If you don't think this is a big deal, then you have no point in using the diamond stone anyway. The images come from a brand new set of Fischer skis, if that makes a difference to any of you, and one of the Diamond Stone companies provided the powerpoint to everyone in our salesforce (to try and disperse the information out through the ski shops).
The reason you sharpen is a ski is to get a precise edge, that is done with a file. Yes it removes a lot more material, but you need to remove a lot of material to sharpen a ski. Use a fine finishing file, and it won't remove that much. Use a Bastard File to set an edge angle, or for damaged skis (after you debut with gummy, etc.) Diamond files are used to polish the edges, and make the skis fast. 20 years ago hardly anyone used a diamond stone, they found the benefits in racing, then all the shops push them as they are high profit centers (the only company making them at that time strictly marketed them to skate shops). (The company I work for distributes the two biggest brands in Diamond Stones to Ski Shops (and to skate shops), so buy them, and then buy more of them!, seriously it will help my year end bonus.)
If you want sharp edges, that is done with the file, if you want fast edges that is done with the stone. Take it for what it's worth, if you feel that your edges are sharp enough from using the diamond stone, then great. You probably could do it 1/5th as often, and feel that they are sharper with using the file though.