>>-Lam stack calculator tool------>

[bjansen]

Surely this has been done before, but I wanted to have an Excel formula that I could use to determine a new lamination stack (for a glass bow) to arrive at a different weight.  

This is a simple formula, based on the idea that when you double the lamination stack the weight will increase 8 fold. Of course, as designs vary so will the effecitveness of this formula, but it should get you close.

Thought I would post as I am sure a few others can use this as well.  

Try this link..

 http://tradgang.com/noncgi/ultimatebb.php?ubb=get_topic;f=125;t=011875

[JamesV]

Good information, better than the guess and miss system I am using. Thank you

[Joe Pawelko Jr.]

what program do you open this up in, or use to view it.

[SportHunter]

Very nice, great idea.

[kennym]

Pretty cool Brad!!

[dmikeyj]

Joe- it is a Microsoft Excel file, if you don't have Microsoft Office, you can download OpenOffice for free, it is an open-source software, and I use it instead of Microsoft Office.

Just search for OpenOffice online if you want to get it.  

Mike

[Mike Mecredy]

Nice, I checked it against some of the records in my note book I've kept over the last 6 years and it computes.  Thanks. This will save me some time.  I've been doing everything on paper with a calculator.

[jsweka]

Brad - That's great.  

Back in December I built my first r/d and it came in at 47# whan I wanted 55#.  I upped my stack thickenss and glued up another last weekend.  Well, that one ended up at 73# and I could hardly sting it.  I did some figuring this past week given my two "experiments" and figured I needed 0.400 total stack.  Your calculator came out with dang near the same total stack, so this is very reassuring.  Too bad you didn't post this about a week and a half ago....

[jsweka]

[Dmaxshawn]

Good stuff Brad.

[Joe Pawelko Jr.]

got it, this is neat, can't wait to start building again.

[bjansen]

Good deal.  I am glad it checks out with your statistics as well.  It checked out to my longbow formulas quite well.

[JJB]

Thanks for the information, this will be very helpful.
-Jay

[Stiks-n-Strings]

I'm gonna copy a link of this post and put in the thread stickied at the top titled newbie vocabulary and other useful info.

 Stiks

[T Folts]

Thanks Brad I will be using it.

Terry

[30coupe]

Must just be me, but I can't get this to open with Excel. Could you save it as the older version too? I thought I had the newer one, but I've downloaded it four times and none of them will open for me.

[bjansen]

Sure, I will post the old excel version too..check the first post again

[rmorris]

That is cool stuff. I checked it with my one piece longbows and it is dead nuts! I am going to be using my old calculations along with this for a while and if all works you may start getting a Christmas card from me! Thanks.

[monterey]

I opened it with no problem using Open Office.  As previously mentioned here.  If you don't have Microsoft office or yours is out of date, you can download the office suite for free at  http://www.openoffice.org/

[30coupe]

I got it to work. Apparently Excel does not like to load stuff from the downloads folder. I moved the file to a folder in my documents, and it opened right up.