What is the tolerance for plug gauge?
Standard practice for plug gauges is to assign a plus tolerance of 5% of the product hole tolerance to the go gauge and a minus 5% tolerance to the no-go gauge, for a total of 10% tolerance band.
How accurate is a go no-go gauge?
The sum of the go and no-go gage tolerances should not equal more than 10% of the total product tolerance (the 10% Rule). The go gage is fairly straightforward. The go must pass freely through the entire length of the hole.
How do you size go no-go gauge?
The easy way of finding GO/NOGO side Go side of plug gauge is always less in diameter but larger in length. But in the case of NOGO, the diameter of NOGO is always greater than the GO side. Easy measurement by plug gauge just assesses by which side of gauge fit in the hole.
How do I know my gauge tolerance?
Subtracting the maximum and minimum diameters, the process tolerance is 0.02. In order to accurately measure these balls, you must use a gage capable of detecting several differences in this range. Using the Rule of Tens, calculate 10% of the process tolerance.
What is no go limit?
Explanation: ‘Go’ limit is applied to the limit corresponds to maximum material limit condition that is lower limit of hole and upper limit of shaft while ‘No Go’ limit is applied to minimum material condition that is upper limit of a hole and lower limit of a shaft.
What does a no go thread gauge check?
The purpose of this is so that the “No Go” gage only checks pitch diameter without being affected by any other conditions. A pitch diameter of an external threaded part is considered to be undersized if it can enter a “No Go” thread gage in most cases by more than 2 ½ – 3 turns depending on the applicable standard.
What is the difference between a GO gauge and a no go gauge?
GO or NOGO or Master Defined A GO cylindrical plain gage is intended to go into/onto the piece being tested. The GO is testing the maximum material condition. A NOGO cylindrical plain gauge is intended not to go into/onto the piece being tested. The NOGO is testing the minimum material condition.
Are pin gauges accurate?
These gages have an inch tolerance of . 0002” and a metric tolerance of . 005mm. They are practical where good precision and speed are important.
What is the purpose of go no go gauge?
Go – No Go gauges are manual mechanical measuring tools used in production lines to guarantee the machining has taken place and it has been performed correctly. They differ from each other based on the type of surface check being performed; for example geometry and/or dimension.
What is the difference between Class Z and Class ZZ gage pins?
Class Z Gages – These gages have an inch tolerance of . 0001” and a metric tolerance of . 0025mm. They are one half the deviation of the ZZ for a better fit.
How do you calibrate pin gauges?
Ring, Pin, Plug, Disc Measurement – Calibration
- Use a soak plate.
- Keep gages and masters close together.
- Allow enough “soak time” for gages to acclimate (2-24 hours, depending on gage size)
- Measure gages quickly.
- Sandwich readings (master, gage1, gage2 . . . ,
- Use gloves or tongs to handle gages.
How many turns are allowed on a go thread gauge?
three complete turns
As Stated in ANSI/ASME B1. 2-1983, the “NoGo (Hi) functional diameter is acceptable when the NoGo (Hi) thread plug gage applied to the product internal thread does not pass over the thread more than three complete turns.” The gage should not be forced.
What is ZZ tolerance?
Class ZZ Gages – These gages have an inch tolerance of . 0002” and a metric tolerance of . 005mm. They are practical where good precision and speed are important.