Originally Posted by Atomicman
I don't know about you guys but the OP has me totally confused.
But at this point, I am baffled by the seemingly contradictory descriptions and symptoms????
And Cheno how does geneourous belt sanding take off more hard metal edge then soft p-tex? Seems like genorous belt sanding would be the exact cause of a railed ski. More ptex removed then hard metal edge?
Haha - ya I was confused too. One way to look at it is - if ski was railed it would be hard to turn, if it was base high it would be turnable but have poor edgehold.
When a ski comes into my shop, first thing i do is run a true bar over it, and then I ask the client if it doesn't hold an edge well, or if its hard to turn. I usually know the answer before they respond. We have many shops around here that are producing base high $25 tunes. When these folks come to us for a tune, we end up being the heroes, since we base grind every ski flat, and reset bevels. And literally bring the ski back to life.
As far as sanding goes, sometimes belt sanding will remove more base than edge. This can happen when shops use coarse 80 grit belts that have not been detuned, when they do not use the machines base bevel plates, and old poorly maintained machines with worn components. An 80 grit leaves the base very hairy, (removes base material by ripping) and should be finished with a finer grit or polishing belt at the least, and at best with a stone grind.
More often in belt sanding is more base edge removed than base material. Some of the variables causing this are: overprocessing of the ski(too many passes), old clogged belts (most shops will use a 100-150 grit as they're workhorse), old machines with narrow bevel plates designed for straight skis(even the most modern machines require extra care by the operator to process the newer wider skis), too much feed pressure, machines that are out of alignment (poorly tuned and maintained), and operator error to name a few.
Belt sanding still has its place in any modern shop though. We typically use ours to make badly railed kids skis skiable, and for snowboards which are never flat once used, and barely flat when new. Some new entry level snowboards have a convex base on purpose, and if you pop one of those in a stone grinder you will grind through in 6 passes. Been there done that - haha. Now we have a blacklist for snowboards we cannot stone grind.
Montana Snow Cruiser - Final pass side-edge and base edge (HTT) processing, after finishing grind. Wintersteiger is designed to be used the opposite way - edges first, then stone grind. Not knocking wintersteiger though - I mostly prefer their equipment over Montana.