OK Tuners, Riddle Me This.....Hanging Burr

[Wilhelmson]

We have to accept that the burr isn't there after he tunes, and that it forms while skiing. Aside from banging on footrests or other hard surfaces, probably have to accept that the edge-snow contact is causing the burr. With the ski on edge during the turning phase we would expect a burr to flare outwards and upwards, about in line with the plane of the base.

As mentioned these skis could have softer edges than most skis. In the case of hard turns on softer metal edges in hard snow and ice, maybe it's possible to create a small outward flaring burr. But, the burr is aligned down, perpendicular to the base! WTF?? This is where some creativity is needed. The snow formed burr could be bent down from banging on the chairlift or rubbing against metal ski racks. Or, op could have switched skis/feet, with the downward burr now on the outside edge of say the left foot. As we know, a thin brittle bur is easily broken off in cold weather on hard snow. Well, rather than breaking off, this soft metal burr in actually bent downwards from low angle turning pushing the burr on the new outside edge against the hard icy surface.

 

[cantunamunch]

We have to accept that the burr isn't there after he tunes, and that it forms while skiing.

Not at all. We just know it gets bigger -visible and palpable- when skiing. Is there such a thing as a burr that is not visible or palpable when sharpening is done - why indeed yes there is, it's called a wire edge burr.

Wire Edge Prevention

bessex.com

Aside from banging on footrests or other hard surfaces, probably have to accept that the edge-snow contact is causing the burr. With the ski on edge during the turning phase we would expect a burr to flare outwards and upwards, about in line with the plane of the base.

Picture it again. Put a flexed ski on edge. What direction is the uncompressed, abrasive snow coming from relative to the edge? That's right, it's coming from above the ski topsheet and it's pulling material off the edge -in the plane of the sidewall - .

The last place you would expect an existing wire edge burr to mushroom into is the plane of the base.

No soft edges or diamond snow required. Congrats to @Dakine for getting his skis sharp enough to have a knife blade problem. Also congrats for having high enough edge angles.

 

[oldschoolskier]

OS, I am strictly talking about hanging burr on sksi from beveling the side edges with a files and diamond stones.

Diamonds stones generally have reduced of a chance of causing a burr that will cause an issue.

File on the other its almost guaranteed the you cause at least one big one. The biggest cause is the direction of cut. If the file teeth are set so that the leading edge is on the sidewall side, burr happens, if it’s reversed then the chance of Burr is greatly reduce.

 

[Atomicman]

Noone does structure or base bevels on his own anymore (those days, when this was done by servicemen after they got skis from factory are long gone). But there's something to consider though. "Comes from factory" is with race skis "a little bit" different thing, then with normal store skis. "Factory" in this case is actual race department, where they have their own machines, including stone grinding machines. So serviceman puts order for certain ski, where model, base, structure and base bevel is defined. And he gets ski done exactly according to his specifications. So on the end each ski is done exactly by serviceman specifications, and not some "standard" output that comes from normal factory. But yeah, nowadays, noone touches base angles or structure on his own anymore.

This makes sense to me!