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06-04-2003 | 07:52 AM

#8

Len in Maryland

Joined: Feb 2003

Posts: 1,385

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From: Baltimore Maryland USA

RE: Tech Minds Needed

Silksy:

Sorry I wasn' t in when you called today. I would have enjoyed talking with you.

What my Store Manager explained to you was correct. What he didn' t relate was the following. When using a Hansen ' spring' scale, the weight of the scale itself, which you see is between 4-5 pounds, is compensated/calibrated with an adjustment screw at the bottom of the scale. You can easily see this by turning the adjustment screw to a minus feature. If you would put the bow on the scale, the total weight will be indicated by the cursor. That weight will now be less than what you will get with the cursor starting at zero. When you turn the scale other than vertical, let' s say horizontal as we' ve done on one of our machines, the pointer will automatically move from 0 to a minus poundage depending on the angle. This is the scale weight being reduced.

Since the springs are now not necessary to measure/compensate the scales weight, they are free to measure draw weight. This will result in (guess what?) 4-5 pounds less draw weight. Remember, the cursor moved to minus and therefore has to travel to 0. This will result in the cursor not traveling as far and a subsequent lesser reading on the scale.

If you were to put the bow' s riser onto the scale and then pull the string, you' d have to recalibrate the cursor due to the weight of the bow. Turning the scale upside down; well, I' ll have to take a look at that situation. The reason I say this is that I have a theory that is not proven. My theory is that the weight of the scale would have to be accounted for in the final cursor reading. In other words, the point of the scale' s spring engagement would have to be know to know where to set the cursor.

Keep in mind that this is a ' spring' scale and that all measurements are to be considered by spring engagement and movement. The length of that movement is so indicated by the cursor. The weight of the scale has to be considered and therefore the manufacturer (Hansen has installed a calibration screw into the bottom of the scale. Also note that these scales, like all scales or measurement devices, are only as good as their calibration. Calibration is determined by using a ' standard' (or a ' golden' model) by which all units should be compared.

This is why I' ve always questioned, and rightfully so, the readings/specs that are given by anyone on the forums, those who come into my store, and even the manufacturers. What ' STANDARD' did they use? This is also why we always do a comparative study by examining several to many bows at one time to do a comparative study. This will tell us who is farther from the TRUTH where advertising is considered. You' d be surprise at how much variance we see from what is advertised.

This again is not to say you don' t have a faulty scale.

Hope this helps.

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