Are my measurements right for Core thickness?????

[Chubz]

Folks

On my first board build.

Finally had some garage time today, wife and kids went to a party. As I was tinkering with core thickness measurements and adjustment calculations, my head keeps telling me that 7mm at center and 2mm at tip and tail are awfully thin.

I am using a micrometer and calipers for measuring thickness so it is in English (standard, whatever you want to call it)units on my tools, then I convert to metric in my other charts I have on hand.

If I have done my calculations right:
7mm= .2758 inches
2mm= .0788 inches

Is this right?

Any input would be great.

Thanks

[Wannabebuilder]

sounds very thin to me unless you weight about 100 lbs,
or your skis are about 142 at the waist or you are building a snowboard.
I'm looking at 12mm in the middle for my fat boards. I weigh 175 and will be telewacking.

[Chubz]

It is for an alpine board and I will be using Titanal, which is my understanding, I can go a bit thinner in thickness, but becuase I am a bit heavier at 210 lbs I may keep it at 2mm/7mm/2mm.

I was taking a look at one of my other alpines and it seemed a bit thin as well.

Other input is welcome.

[hugocacola]

hey chubs, for a alpine board that measures is ok, and you will use some titanal. but a advice use alot of vds ruber is better for absorivng impact on carving and the titanal will give it some strenhg, so... its ok,,, for me. other stuff , but use some good fiberglass for totorsional,,,

[Chubz]

Hugo

Thanks, but thats where I am struggling. Determining what laminates and their sequence. I understand that the Titanal teamed with some CF (uni) significantly helps with the torsional becuase of the qualties of the T.

I have submitted some build sequences with fiberglass to a contact I have who is a very reputable alpine builder and he indicates I may have some problems with the FG experiencing shear between laminates. I also know that CF and Titanal should not be laminated directly with each other becuase of their chemical reaction with each other.

Here is the sequence I propose- ????? represent the material I need to separate the metal and CF. All west system epoxied

topsheet
CF Uni
?????
T chem etched
Wood core
CFUni
????
T- chen etched
vds
base- acetone cleaned

Thanks for the input.

[hugocacola]

hey chubs

titanal bond well when sanded and you should put it above wood core, but you must put some fiberglass mask( no roving) above the core then the titanal then a layer of VDS then another mask layer then the fiberglass and finaly top sheet.

if you dont have the VDS layer put some mask only, it should work...

PS titanal should be sanded with a low grain tape like 60-80


regards

[Chubz]

So you are saying from the top down:

Topsheet
Mask
VDS (strips or the whole way across?)
Titanal
Mask
Core
Mask
Titanal
VDS (Strips along edges)
Base


Should there be another layer of mask in the bottom T, VDS and base or will the T and BASE bond?

VDS makes sense because I have been told before it acts as a buffer and flexible layer for metal.

I assume the mask is super thin or light and is there a proper name for it and weight. I only ask because when I CF or fiberglass shop, there are so many types out there. It seems having that many layers of mask is going to make it super stiff.

I am going to stick with Titanal etched with cheimcal because a company about 1 mile from my house makes chemical aluminum etch, plus I tried sanding in my first sample and it just peeled apart.

I cant thank you enough for the insight. I can let my brain rest a bit.

Would you be open to exchanging emails on building?