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Base Material as Tip Fill
Posted: Mon Apr 27, 2015 4:10 am
by gketcham
Is anyone using different color base material to substitute as tip fill for their skis? I tried it because its the same stuff, scuffed both sides but my skis keep delaming. Thanks.
Posted: Mon Apr 27, 2015 9:25 am
by pmg
Did you also flame both sides?
Posted: Mon Apr 27, 2015 5:16 pm
by MontuckyMadman
Yeah ive done ths sevral times. Multiple layers as well. Works fine.
Posted: Tue Apr 28, 2015 3:24 am
by skidesmond
Yes I've done that also. Works fine.
Posted: Tue Apr 28, 2015 2:22 pm
by mikic1
yes (1.2mm + 1.2mm both sides flamed and sanded), no problems at all.
Posted: Tue Apr 28, 2015 4:28 pm
by vinman
"scuffing" it might be your issue. If you are using stuff from crown that is only abraded on one side then it might just be too smooth.
If by scuffing it you have sanded it with 80 grit and it is nicely abraded and then you flamed it properly then maybe it would bond well enough.
I think I would personally hand sand the smooth side with 40, 60 and then 80 grit wrapped around a PVC pipe to get it abraded well enough that I though all of the smooth surface. The reason I would hand sand is that a belt sander would probably build up too much heat. Hand sanding a small tip spacer piece like that would only take 5-10 min maybe.
Be sure that you also flame the piece. If you handle it excessively or without gloves then you might also need a wipe down with alcohol or other solvent of choice.
Posted: Tue Apr 28, 2015 4:56 pm
by sammer
Haven't had a delam yet in the few pair I've done.
I usually hand sand with 120g then flame.
Good way to use up scraps.
A single layer is the perfect thickness for kids skis.
Machining the cores that thin is a different story.
sam
Posted: Fri May 01, 2015 5:16 am
by gketcham
Oh thanks everybody. I sanded the one side on a belt grinder with a very low grit belt. I also did not flame treat it. I'll try a better method, use gloves, and flame treat next time.
Posted: Fri May 01, 2015 11:05 am
by vinman
You've got to flame it! That's likely your delam problem.
Posted: Fri May 01, 2015 12:22 pm
by mammuth
What i do:
grind with 80 grit
clean with ethanol
flame
in some doc posted here this was descibed as the best method (was a scientific? test)
Posted: Fri May 01, 2015 3:02 pm
by vinman
the solvent might not be needed unless you think you've gotten things oily with your hands.
Flaming should be done with the very end of the flame at a rate of ~1 foot per sec
link to west systems web site for use of their epoxies, abrasion, and flaming.
http://www.westsystem.com/ss/gluing-pla ... lex-epoxy/