Validity of Calibration Stickers on Measuring Tapes and Rulers

R

Ron Tollett

#1
Hi Team,

The Jigs we use have a calibration sticker on them indicating "Calibrated, ID#, By, Date and Due" We actually check these with a measuring tape and/or ruler to see if it's is in the specified tolerance. The question is, if the sticker says calibrated, is this politically correct?
 
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Jim Wynne

Staff member
Admin
#2
Re: Calibration

Hi Team,

The Jigs we use have a calibration sticker on them indicating "Calibrated, ID#, By, Date and Due" We actually check these with a measuring tape and/or ruler to see if it's is in the specified tolerance. The question is, if the sticker says calibrated, is this politically correct?
If you compare the thing to a standard, you have calibrated it.
 

Stijloor

Staff member
Super Moderator
#4
Re: Calibration

Hi Team,

The Jigs we use have a calibration sticker on them indicating "Calibrated, ID#, By, Date and Due" We actually check these with a measuring tape and/or ruler to see if it's is in the specified tolerance. The question is, if the sticker says calibrated, is this politically correct?
Tape measures excite people here at The Cove Forums!! :lol:

Watch.. :popcorn:

Stijloor.
 
W

widetrack

#6
Re: Calibration

if you mean, is it politically correct to check them even if they say calibrated? (with a tape measure?) welll,,,that may depend oin the person who calibrated it, but, if it makes you feel better then do it!
 

BradM

Staff member
Admin
#7
Re: Calibration

Hi Team,

The Jigs we use have a calibration sticker on them indicating "Calibrated, ID#, By, Date and Due" We actually check these with a measuring tape and/or ruler to see if it's is in the specified tolerance. The question is, if the sticker says calibrated, is this politically correct?
Well... good question. There are several definitions of "Calibration". The activity you are performing should match the definition you have in your documentation. If you conduct an activity on your jigs that matches how you define calibration, then it is appropriate to call it a calibration.

Tape measures excite people here at The Cove Forums!! :lol:

Watch.. :popcorn:

Stijloor.
:lmao::lol::lmao:
 

Mikishots

Trusted Information Resource
#8
Hi Team,

The Jigs we use have a calibration sticker on them indicating "Calibrated, ID#, By, Date and Due" We actually check these with a measuring tape and/or ruler to see if it's is in the specified tolerance. The question is, if the sticker says calibrated, is this politically correct?
I'd be curious as to the tolerance requirements of the jig vs. the standard you're using (tape measure, ruler). Tape measures can be notoriously poor in terms of accuracy. The tolerance of the standard needs to exceed the tolerances of the jigs.
 
R

Ron Tollett

#9
The industry we are in is wood. We are using a ruler which has been calibrated to certified calibration laboratory. The tape measures we use are checked against the calibrated ruler. The tolerance the product is ± 1/16th". Therefore the jigs also have to be to a tolerance ± 1/16".
 
#10
When you are comparing the measuring tapes to the calibrated ruler, it would be very easy to have an accumulated error of anywhere between 1/64 to 1/32 depending on the graduations and length of the ruler and the graduations and length of the tape measure. A basic rule of thumb is the tool verifying an item for calibration be ten times more accurate than the dimension being calibrated, so you should be using calipers, calibrated to gauge blocks, to calibrate your jigs with .0625" tolerances (10 X .06 = .006).
 
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