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Help! I'm destroying my skis

post #1 of 15
Thread Starter 
I've watched a professional tuner tune his skis, read countless tuning tips online, and bought myself good tools/stones/file guides, etc. But whenever I touch my skis they just get more and more dull. I just can't imagine what I'm doing wrong. It feels like everything is working, but when I check the edge, it barely scrapes my fingernail. What could I possibly be doing wrong?
post #2 of 15
Edges could be work hardened. They might respond to a file.
post #3 of 15
Thread Starter 
I took a file over the edges and it definitely removed a lot of material, then went to diamond stones for finishing and that's when the edge went dull on me
post #4 of 15
Do you have sidewall planer? If not have you had someone else rip the sidewalls?
post #5 of 15
Are you using the right side of the stones.
post #6 of 15
are you putting too much pressure downwards when doing you side edges. It's a pretty common mistake to push down as hard as you can which can cause you to not truly allow the guide to keep the file/stone at the proper angle. Maybe try more pressure laterally (into base)
post #7 of 15
  • Are you running your file in the right direction (note that it's unidirectional)?
  • What do you use as a file guide?
  • Are you changing the factory side bevel? To cheapest way to check is to first use a sharpie to mark the edges before you file?
  • Depending on the skis, side wall skiving (planing) may be a must before you file? Is the file being clogged with sidewall material?
  • How are you polishing your edges with the stone?
post #8 of 15
Chanwmr,
Read his second post. The problem seems to start when he uses his stones. It could be sidewall interference; the file would be able to remove the sidewalls better than the stones.
post #9 of 15
As everyone else said... sidewall. Color a little are of the edge with a sharpie. Color some of the sidewall too. If you see the color coming off of the sidewall then plane it back. You can usually see the sidewall material on the stone. You will see a grey strip from the metal edge with a tan or plastic color above they grey. Get down eye level with your guide and stone and look at what is going on.

If you are using spring clamps on an L shaped guide like the SVST you could be pushing down too hard and lifting the stone off of the guide. Or, as mentioned above, you might not be pushing hard enough towards the base side of the ski. The guide will lift away slightly from the base.

After filing, what grit stones are you using? File, 120, 220 then 400 and higher in progression. If you go from a file to a very fine grit stone you will have troubles.
post #10 of 15
Quote:
Originally Posted by Ghost View Post
Chanwmr,
Read his second post. The problem seems to start when he uses his stones. It could be sidewall interference; the file would be able to remove the sidewalls better than the stones.
Quote:
Originally Posted by MLBfreek35 View Post
I took a file over the edges and it definitely removed a lot of material, then went to diamond stones for finishing and that's when the edge went dull on me
Let's take a look at this again from the beginning.

OP, all you mentioned was that you took off lots of material with the file. Did you check the edges for sharpness before running the stone over them? And what kind of material was it that the file took off?
post #11 of 15
Quote:
Originally Posted by MLBfreek35 View Post
I took a file over the edges and it definitely removed a lot of material, then went to diamond stones for finishing and that's when the edge went dull on me
I rest my case.
post #12 of 15
Quote:
Originally Posted by MLBfreek35 View Post
I've watched a professional tuner tune his skis, read countless tuning tips online, and bought myself good tools/stones/file guides, etc. But whenever I touch my skis they just get more and more dull. I just can't imagine what I'm doing wrong. It feels like everything is working, but when I check the edge, it barely scrapes my fingernail. What could I possibly be doing wrong?

It's hard to tell, but your post had me wondering about whether by 'dull' or 'barely scraping your fingernail', you are actually comparing how a burred edge scrapes your nail versus a smooth and sharp edge does? How do your skis carve?



As mentioned, the pressure on a spring clamped stone and guide is often an overlooked issue and good to pay attention too. Let the tools do the work, keep them clean and prolong their life and assure accuracy.

Regarding side wall planing or cutting here is a side wall planing and cutting tip entry with video and images. And if you haven't seen the SVST tuning video, two edge tuning clips are embedded in this edge tuning tips entry.


Edited by Alpinord - 9/30/11 at 6:46am
post #13 of 15
Hmmm..... Is it just that my memory is failing or is there something wrong with the order and the description of the edge work on these videos.

Both the order of the videos and the description in the videos talk about setting the side edge bevel first and then the base. From a practical perspective - side angle is relative to base angle - and due to the fact that, as I understand it, sharpening edges should more often entail doing the side edge and infrequently doing the base, I would say that the order should be reversed, ie do base first (if needed) and edge second for both initial setting of the bevels and future sharpenings/touch-ups. Am I missing something? or is it just that the LACK of alcohol last night has dulled my mind?
post #14 of 15
Bignick, I'm yet in a bit of a fog, (really its foggy here) but perhaps I can shed some light. The side edge guide does take its angle from the base, but not the base edge. I usually set the base bevel first then work on the side edges and return to the base just to remove any burr. In fact once the base bevel has been done after stone grinding, I never touch it again except to dress a nick or remove burr.
post #15 of 15
Yup, we are in agreement. You are also right about the side edge angle from the base, not the base edge - my mistake. I follow the same order and technique, ie. remove burr from base as last step, as you.

I just thought it strange that the video order and description both were reverse of what I do and have read.

Thanks.
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