Plug Gauge Size shows increase after use? Criteria for acceptance of the gauges?

A

abcauto

#1
Dear All,

Please guide me whether it is possible that the plug gauge size increases after use.
the issue is that we have an plug gauge 75H7 (basic size -75.000 go and 75.035 nogo but after third calibration it shows 75.013 go and 75.037 nogo.

Please reply.Whether it is material problem or calibration problem or it could be possible in sonme cases.

Also if possible give me guidense on acceptance criteria of gauges.

Thamnks and regrds
:agree:

ANAND
 
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Z

zancky

#2
I can only give you my personal opinion (not an expert)
1) 75H7 according to my table is -00/+30 microm meter -0/+35 only above 80 mm (can you confirm?)
2) on some old books it sated that plug gage must be built (machined) across the target value, ie no-go gage 75.030+something1 /- something2 due to machining tolerances, but this is against Asme Y14.5. A go plug gage should be 0/+something, therefore Your 75.013 is acceptable, but the NoGo gage should be 0/-something therefore 75.037 is out. how much is "something"? depend on You or the ability of plug gage constructor
3) A better point of view would be if You consider plug realisation tolerance the uncertainty on dimensional check for plug calibration with 95% of confidence and the wearing effect. Therefore if You can machine Your go plug gage with an accuracy (cilindricity, mean diameter etc) about 8 micron and the laboratory can control Your plug gage with 2 microm
the go plug gage must be 75.002 (lower tolerance) and 75.010 or the minimum value for safe maching + laboratory uncertainty as (upper tolerance), You may consider 75.012 but it decreases the pratical part tolerance
if you consider that the plug gage will be inserted many times during the year you may wont to consider wear, therefore lower tolerance shall be increased (75.005 ?) by an anmount due to your experience.
No go gage, same as plug gage but there is no wear concern. Somebody take care of part roundness decresing upper tolerance for the plug or design no go plug gage as a rounded blade with minimum thuckness
4) change of dimension during time may be due to oxidation or deformation of the part
 
J

JustinJTV - 2009

#3
I've seen this happen. There are a number of causes for this. Are you performing these measurements inside of a temperature and humidity controlled laboratory?
 
H

Hodgepodge

#4
Dear All,

Please guide me whether it is possible that the plug gauge size increases after use.
the issue is that we have an plug gauge 75H7 (basic size -75.000 go and 75.035 nogo but after third calibration it shows 75.013 go and 75.037 nogo.

Please reply.Whether it is material problem or calibration problem or it could be possible in sonme cases.

Also if possible give me guidense on acceptance criteria of gauges.

Thamnks and regrds
:agree:

ANAND

It is possible for such gages return larger sizes than previously recorded. What material is the gage made from? I would hope it is not made from a material that can oxidize. Tool steel would be fine for some applications and hard chrome would be the top choice for most.

It is possible for the gaging surface to become galled, scratched, or even have material deposits from the parts you are inspecting (depending on what type of material you are inspecting). Galled or scratched areas are likely to be localized and it should be possible to determine if this is the case while inspecting the gage. I suppose damage from mishandling would be obvious and not the case here.
 
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