Method for Calibration of Thread Plug Gauges

  • Thread starter bakhtiar - 2009
  • Start date

Wayne

Gage Crib Worldwide
#11
Can you help me and provide an official standard that stipulates the controlled temperature of 68°F (20°C) is required for a small machine shop.
I do not know of any official standard which stipulates this requirement.:read:

IMHO::thedeal:
The controlled temperature of 68°F (20°C) is required for Accredited Calibration Laboratories. The official standard applies to Accredited Calibration Laboratories in their search for zero. It is used so that there is one less variable to lab-to-lab repeatability.
For the small machine shop; use what works, what you can defend by tested results, and what you and your customer can agree upon.:agree1:
 
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Eredhel

Quality Manager
#12
CAn you help me and provide an official standard that stipulates the controlled temperature of 68 Degree F (20 C) is required for a small machine shop.

Most of the shops use the same temperature that the master and instruments are used - therefore avoiding the 24 hrs waiting period for both metals to be at 68 degree F ( as recommended in a 1931 british study. However, that test was done so that manufactures around the world can provide the same results in master gage block during manufacturing.
Thanks
I don't think you'll find a standard that "requires" a small shop to do it, outside of a certification you are pursuing, but if you do a Google search for "ansi inspection room temperature" you'll get what's used industry-wide. You'll probably just want to decide what your shop wants to do and implement it. We go with 68° ± 3° for both our QC rooms, they have 1 CMM and 1 comparator in each. We have fewer than 60 employees.

Edit: I forgot to mention that our production facilities are climate controlled too, and that helps a lot.
 
Last edited:

dsanabria

Quite Involved in Discussions
#13
I don't think you'll find a standard that "requires" a small shop to do it, outside of a certification you are pursuing, but if you do a Google search for "ansi inspection room temperature" you'll get what's used industry-wide. You'll probably just want to decide what your shop wants to do and implement it. We go with 68° ± 3° for both our QC rooms, they have 1 CMM and 1 comparator in each. We have fewer than 60 employees.

Edit: I forgot to mention that our production facilities are climate controlled too, and that helps a lot.
Thanks - if the the shop is temperature controlled - yes ... good plan

if the shop is not temperature controlled - still a good plan

what matters in the verification and adjustment of equipment (Note: Calibration is a word that means something else for what happens in a small shop) is that the same temperature of the master match the temperature of the equipment.

They must be of the same temperature because of the expansion of metal.

Note: for Calibration lab - according to the Labs that qualifies NIST instruments - temperature is not an issue - as long as the temperature of the equipment (master) is the same as the instruments are calibrated.

I audit those labs and they are comfortable to walk in and according to the Physicist - temperature is not an issues if both (masters and instruments) are at the same temperature.
 

Eredhel

Quality Manager
#14
Ah I misread, thought I was answering a small shop's question :). I have a feeling QMS standards that most smaller shops use will avoid getting so specific, although obviously calibration labs are a different deal.

I'm definitely glad our shop floor has heat and air too! We're also fortunate that ownership lets us to pay outside sources to do the yearly calibrations of our CMMs and comparators. I'm very glad not to have to chase that rabbit too!
 
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