Mathews Inc.
How to Measure Cables & Strings
Equipment
Contributors to this thread:
Russell 28-Nov-17
x-man 28-Nov-17
SteveBNY 28-Nov-17
Bloodtrail 28-Nov-17
Russell 28-Nov-17
x-man 29-Nov-17
SteveBNY 30-Nov-17
x-man 30-Nov-17
From: Russell
28-Nov-17
What is the proper way to measure a set of cables and strings?

Do you use posts to hold the loops that are the same diameter as the bow's attachment points?

Is the measurements from center to center or outside dimensions?

The specs for cables and strings are precise; so if one uses the wrong start/finish points, or the wrong holding pins, the measurements will be inaccurate.

From: x-man
28-Nov-17
My string supplier said he measures his strings on a sliding rule he made that has two pegs 3/16" OD. Measure outside of peg to outside of peg with 50 pounds of force.

From: SteveBNY
28-Nov-17
Most string builders use 1/4" pins at 100# of force - outside to outside. That is the AMO standard.

From: Bloodtrail
28-Nov-17
Russell, are you asking how to measure the strings/cables on your bow in order to replace them? I would refer to the manufacturer and ask them what the specs are for your bow. I would assume if you simply removed your strings and cables and measured them, it would not give you the correct measurement to replace as they would have stretched.

From: Russell
28-Nov-17
I appreciate the responses.

Needed to know how to verify lengths when I purchase new cables and strings.

Also, during tuning if I get things all messed-up, I know how to reset to square one.

From: x-man
29-Nov-17
Unfortunately the AMO does not exist anymore, thus their standards have not applied for over a decade. It would be nice if everybody used a set standard however.

From: SteveBNY
30-Nov-17
I belong to a group of over 50 custom builders on FB. All of them use the AMO method of outside 1/4" post with 100#'s pressure for final build measurement. It is used for the lengths put on the bow limbs for every major bow manufacturer as well. May not be a written standard but it is the one used pretty much universally. I am sure one can find exceptions.

From: x-man
30-Nov-17
Not arguing with you Steve, just pointing out the facts to the original poster. 100 pounds is not needed with today's string materials. They don't stretch like Dacron and Fast Flight, which can stretch 1/4" or more between 50 to 100 pounds. Keep in mind the OP was asking how to check his existing strings for accurate length. When I made strings, I kept 100 pounds on them while applying the serving, but if you're checking the length of a completed string at home, even 20 pounds should suffice. With modern string materials the difference between 20 and 100 pounds would be less than 1/32". Seems as though the most important question was to measure from the inside of the loop or outside of the loop. That could make as much as 1/8" difference.

The last issue of the AMO Standards that I received as a member was 1987. A lot has changed since then.

  • Sitka Gear