# Electronic Hanging scales

Question about hanging scales. I am building some weight stations for an archery group. We use electronic hanging scales to weight the bows. Once in a while a wood bow will break and the scale goes flying. Would a 1" thick foam suit give the typical scale enough padding to prevent damage from getting thrown around.

Why is the scale getting thrown when a bow breaks?

I assume that he is measuring the draw force.
This technically isn’t weight which is a force due to gravity and mass.
If measuring a non-weight force, the units of pounds-force, newtons, kilograms-force, etc would be correct.
Of course, in normal usage, the ‘force’ is often dropped.
When measuring a non-weight force, a scale becomes a dynamometer.

To the OP, I’m sorry to say that there’s no such thing as a typical scale.
First, consider the capacity of the load cell.
If it is something like 100 lb, it probably won’t see that kind of force when thrown or dropped.
If it is 5 lb, you should be worried.
Second, how well made is the rest of the scale?
A sturdy load cell and fixturing won’t be much good if the housing is flimsy or the PCB/LCD cracks on impact.

Why can’t the ‘fixed’ end (I mean the end opposite the drawn string) of the dyno be secured to whatever is pulling it?
Even a well made instrument only has so many drops to the floor before it breaks.

We usually just hang the scale right off the bow and draw it till it reaches full draw, no more than 100#. Scale will be 100#. I can attach it on the end that I am pulling on just as easily, Might sacrifice just a tad of accuracy going through a pulley before weighing.

How do you use the force measurement?
Is there some dimensional measurement you make at a given draw force?

In other words, do you draw to a given force value and measure some length?
Or do you measure some length or draw a certain distance and then take a force reading?
What are the dependent and independent variables here?

In this particular instance we will be qualifying bows to shoot in various weight classes. We take their longest arrow and make sure that when that arrow is fully drawn it will not exceed the weight clas the bow is entered in. Typicaly we will measure 35#, 50# and 70#.

Do you have a photo of the setup?

You can just google “tillering tree” bow is hung by the handle about 6 ft off the ground and a rope and pulley mounted at about ground level, we stand back several feet and pull the rope while watching the yard stick and the scale.