Hi guys,
I would like to know how the line strength and lure weight are determined by the manufacturer for rod blanks.
Is there a calculation or test that can make this determination?
I would like to trim a rod and the amount I want to trim will be substantial and I want to reclassify the specs on the rod. Is this possible?

Thanks!

Why not just get the proper blank? Are you wanting to trim from the butt or the tip. It makes a big difference.

Top left of screen left click on "CCS Database". Select Part 1. Goto page eight and scroll 3/4 of the way down and look at "Table C". Once you do your ccs homework go back online to find rods simular to yours and see what the line weight is recomended as per the weight measured by your homework.

Line strength really can't be determined as it's a subjective idea based on what the manufacturer thinks might be in the ballpark for a particular use (unless we're taking about fly rods and fly lines). The rod will never know what line strength you have on it.

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To add to what Tom said, you can load 50# line on an ultra light rod and if the drag is set right, you may get away with it. The opposite is not necessarily true with light line on a heavy rod. It will definitely break before putting any kind of a bend in the rod.

It is a rod that I have and I will be trimming the tip. I want the rod to me stronger as it will be used as a saltwater boat rod.
Thanks foe the input !

Trimming from the tip will allow it to handle a little more casting weight, but will not make it stronger. The butt diameter and walls are what they are.

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Jon,

I don't build the kind of rod you're proposing, but I can assure you it's common practice to trim from the tip of a blank to increase it's capacity, and then trim from the butt to get the length you want. Realize though that if you trim a "substantial" amount from the tip you will likely change the action of the blank in a "substantial " manner. Before you cut the blank, try to mock up what you want to do with the blank. Take the terminal rigging you want to use, including any sinkers, and use a section of mono with a loop in the other end to suspend it from the blank where you think you want to cut it. You can use tape to hold the mono loop to the tip area and move the mono up and down the blank to see if you can find a sweet spot. If you find a good spot, measure back from there and mark the location where your butt cut will be (if any), and then measure up from there to determine your handle locations. Then holding the rod in these locations, check the action and power to see if this is what you're hoping to achieve. A this point you'll know whether or not this blank will suit your needs before cutting it. Keep in mind you might want to trim conservatively at first, you can always trim a little more, but if you trim too much at first you can't realistically add that back.

John gives good advice here!!