Hello,
Does anyone know of a formula or on line chart to determine the winding check size of a rod blank if the butt diameter is known? Broke my micrometer last night and thought something like this may exist. I'm building a Sage RPL 590-4 (it's the same blank as the VPS, Sage just changed the name a few years ago) I checked the Sage web site but couldn't find anything.
Thanks,
Mike

Mike,
Each blank model would be slightly different. The tapers and the handle lenghth determine which size of winding check you would need. Generally on a blank such as this, you might go with one size smaller than the blank diameter, or ask the vendor that sold you the blank for a good fit winding check. The rubber/vinyl checks can stretch a bit to fit. The metal winding checks can be slightly reamed to fit, or with adding thread to slightly build up if loose.

Rich
Richard's Rod & Reel

Email the place where you got it from. Ask them to measure it however far up on the butt section you need and order the checks from them. order one over, one under and one that is right. Save the two you dont use for a later project

Mike,

You can use the formula below. This formula assumes that the blank tapers linearly from butt to tip, which is not necessarily the case. It should put you in the ballpark though. You will need to order a few sizes in the vicinity of the number that you get from this formula.


W = (B x (1 - P/L)) + (T x ( P/L))

All values are in inches

where
W represents the winding check diameter
B represents the butt diameter
T represents the tip diameter
L represents the total length of the blank
P represents the position on the blank relative to the butt end) where you will install the winding check..

Be careful with the calculation if you are not mathematically inclined. I recommend calculating P/L first and then using this value in the two places in the formula that use P/L. Good luck!