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Swollen bases near edge. Base grind?

post #1 of 14
Thread Starter 

I just purchase a used pair of atomic SL 11s.  They were cheap, but I am wondering if I made a mistake.

 

These are 130s for my son.  The top plate looks pretty good.  The bases don't look too bad.  The edges were pretty rusty, but nothing a couple of swipes with the file can'f fix.  The big concern, however, is that the base is raised, just slightly, along the edges.  The problem is very uniform along both edges on both skis.

 

It looks like a couple of base grinds would fix it nicely.  But what is the problem here.

 

Is this swolen from possibly water?  The start of delamination?

 

Any thoughts.

post #2 of 14

Pictures?

 

Could it possibly be a problem of a slightly concave base that has been agressively base beveled,  the file biting well into the plastic?

 

 

post #3 of 14
Thread Starter 

Thanks for the reply.  I dont think this has been done to the ski with a file.

 

From the center of the ski moving towards the edge its nice and flat.  1/4 of an inch before the edge the base starts to curve up toward the joint between the metal edge and the base.  Seems like the base is swollen here.  Then the edge is about the thickness of your fingernail below where the joint is. 

 

I tried to put a base edge bevel of 1 degree on it and the file doesn't reach the stone because the raised base is holding it off.  I actually took a utility knife blade and used it like a metal scraper to try to knock down this little lip along the base.  It removed some of the edge but I will take it in for a base grind.

 

I asked around the club I race at and some thought that it might have been caused by too hot of an iron during waxing.

 

I will try to get a picture posted.  I haven't done one on this forum before so I will have to figure it out.

 

Thanks/Doug

post #4 of 14

Here are the Support Wikis which includes image uploading and mangement.

post #5 of 14
Thread Starter 

Swollen base at edge

 

It was hard to get an easy pic to see the problem, but you can see on the scraper where the high spot touches.

post #6 of 14

It would be helpful if you used a small flashlight behind your scraper.  The light will be brighter in low spots between the base and the scraper.  It will provide a better photo and give you a better idea of how bad your sons bases really are.

 

Don't use a flash...maybe just some more ambient light.

post #7 of 14

Here's a brighter version.

Sure makes me wonder that the conductive heat on the iron at the edges did this. Are there any apparent gaps between edge and base material?

 

post #8 of 14
Thread Starter 

Thanks for brightening up my pic.

 

The edge seems tight to the base.  It does not appear loose in any sections.

 

I have since taken it into a local ski shop.  The tech did not think is was caused by an iron and said that the ski looked railed.  He did not really explain what that meant but that the bases simply had not been tune in a while and that he could fix it.  His manager was more conservative and said that he would probably have to put a belt sander on it to take out the high spots and then do the grind.  I told him that it was for racing and that I wanted it perfect.  He warned me that if he took off too much he would bugger up the ski.  As the ski is screwed up now I told him to go ahead and do his best.  The tune is going to cost me almost as much as the used ski did.  If this works I'll have a good nice pair of SL 11s, if not my good deal has turned out rather badly.

 

Thanks/Doug

post #9 of 14
Thread Starter 

Well I got my skis back today after the grind and they look perfect.  I will have to see how they ski, but I think they will be great.

 

Thanks/Doug

post #10 of 14

Good to hear. Be sure to rub down with fiber pad. Hot scrape a couple times, then follow with soft soft base prep and then hard prep wax cycles, then WOTD before expecting a decent glide.

 


Edited by Alpinord - 2/20/2009 at 01:30 am
post #11 of 14
Quote:
Originally Posted by Alpinord View Post

 

Here's a brighter version.

Sure makes me wonder that the conductive heat on the iron at the edges did this.

 

 

Without actually having burned the base, yeah.

Quote:

 

 

 

Are there any apparent gaps between edge and base material?

 

 

That almost looks like a failure of the base to core bonding layer.

post #12 of 14
Thread Starter 

I really don't know what caused the swelling, but they will get about training over the weekend.  If there continues to be a problem I'll post it.

 

The technition at the ski shop said they looked "railed".  Does anyone know that expression?  What does it mean?

 

Thanks/Doug

post #13 of 14

Railed edges are a term that is used when the ptex doesn't meet the level of the edges and the edges protrude past the ptex creating a set of "rails" that run the length of (or part of the length) of the ski. If you put a straight edge across the base it would rest on the edges and there would be a gap between  the  ptex and the straight edge. It literally looks like a pair of train tracks running down the edges of the ski. Usually caused by wear on the ptex from sporadic or non existent waxing or faulty initial application of the ptex to the ski during construction. Railed skis feel terrible and perform worse. What your picture shows is not a railed ski at all and I would wonder about the tech using this term as it's incorrect. Hope that helps.

 

                                                 Joel

post #14 of 14

Railed is also 'generically' used to describe a concave/base low condition that does cause the ski to act similarly to a truly railed ski. From the True Bar Wiki:

 


Edited by Alpinord - 2/20/2009 at 02:26 pm
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