Generic Accuracy of a 100 foot Tape Rule

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harry

Super Moderator
#2
Hi lhiga,

I wonder if this helps. Many years ago, I was involved with engineering survey works. Results we checked against EDM - laser type equipments.

Quality steel tapes - 0.25 - 0.5 inch out per 100 feet.(almost always longer)
Cheaper steel tapes - 0.5 -1.0 inch or even more per 100 feet.
Fibreglass tapes - more than 1 inch per 100 feet.

These figures serves as a guide only as many other factors such as the force applied in pulling the tape is involved.

Generally after a few measurements, I have an idea of how much the specific tape is out and I apply linear corrections over what ever distance measured.

Harry
 

Wes Bucey

Quite Involved in Discussions
#3
This is a case where stretching of the material due to heat can and does come into play. Technique of pulling or stretching tape (look at power lines SAG more or less during heat of day and cool of evening) or laying it on flat surface can aggravate or ameliorate the stretch.

Thickness of the tape as well as construction design (curved or flat) are also minor factors. Material of the tape (steel, cloth, plastic, etc.) determines amount of stretch per degree of heat change.

What are you measuring? How will IT be affected by heat? Bridges expand and contract as much as several feet depending on initial distance between supports. In Chicago, we have frequent pavement "blowups" during the summer where the highway pavement expands so much, it buckles and breaks.
 
N

nk soni

#4
Re: Generic Accuracy of tape rules

Wes Bucey said:
This is a case where stretching of the material due to heat can and does come into play. Technique of pulling or stretching tape (look at power lines SAG more or less during heat of day and cool of evening) or laying it on flat surface can aggravate or ameliorate the stretch.

Thickness of the tape as well as construction design (curved or flat) are also minor factors. Material of the tape (steel, cloth, plastic, etc.) determines amount of stretch per degree of heat change.

What are you measuring? How will IT be affected by heat? Bridges expand and contract as much as several feet depending on initial distance between supports. In Chicago, we have frequent pavement "blowups" during the summer where the highway pavement expands so much, it buckles and breaks.
Is there any standard guide line for uses of Tapes. Like - use steel tape for stracture febrication/stretch tape can use for cloth measuremnt?
 

Randy

Super Moderator
#5
harry said:
Hi lhiga,

I wonder if this helps. Many years ago, I was involved with engineering survey works. Results we checked against EDM - laser type equipments.

Quality steel tapes - 0.25 - 0.5 inch out per 100 feet.(almost always longer)
Cheaper steel tapes - 0.5 -1.0 inch or even more per 100 feet.
Fibreglass tapes - more than 1 inch per 100 feet.

These figures serves as a guide only as many other factors such as the force applied in pulling the tape is involved.

Generally after a few measurements, I have an idea of how much the specific tape is out and I apply linear corrections over what ever distance measured.

Harry
Don't go building pyramids in Egypt with the amount of variance you've got above.
 

Cari Spears

Super Moderator
Staff member
Super Moderator
#10
Al Rosen said:
Are you sure it wasn't another part of the pharoah's anatomy?
LOL. As a matter of fact, my Metrology textbook does reference other Pharoah parts like the length of the foot, the hand span, overall height...let's see...am I forgetting anything?...
 
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