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If you have a positional tolerance of 0.4 mm, one has +/- 0.2 mm on both the X and also Y direction for center movement from the theoretical center (called "true position"). Features must be confirmed on both ends of the square hole controlling orientation. Now, MMC on the positional of a square hole; it is best to have a checking fixture with ...
Which ever number you use, the next calculation seems wrong. 9.93e-9 failures/hr * 4.38e7 hr = 0.43 failures (not 43 failures). if I multiply by 22, I get 9.6 failures per year for 5000 devices. In either case, this is way more than 14 failures in a few week for 100 devices.
Change MTBF (in hrs) to Failures In Time (number) by. Failures In Time = Time Period / MTBF. for MIL-217F, Time Period is 10^6 hrs. for SR-332, Time Period is 10^9 hrs. Add all FITs together, Use same formula to calculate system level MTBF. FITs (and therefore MTBFs) are also dependent on operating and environmental conditions.
There are three things to consider about Composite controls (one symbol, multiple segments). 15X The "X" symbol establishes a pattern of features. This means the basic location and orientation of all features in the pattern is locked for all six degrees-of-freedom among the pattern members themselves regardless of any datum features.
OmarEn. I have three situations trying to do a Cpk with unilateral tolerance. I hope you guys can give me some advice on this. 1. I want to conduct a CPK for a diameter that is 10.0mm +0.1 -0.0. 2. I want to conduct a CPK for a diameter that is 10.0mm minimum (it does not have a maximum limit). 3. I want to conduct a CPK for a flatness of 0.3mm.
Good Day to you, MTBF for individual components = Total Operating Time / No of failures . = 1/λ (Failure rate) MTBF for a System = (Total operating time X no of Components in a system) / (No of failures). Babu.
TAKT time is the longest a process can take to make the contracted amount. You get TAKT by dividing the time you run (like if you run two 8 hr shifts a day with no breaks, the time is 16 hrs) by the number of parts you are required to make in this time. No part of your process can be LONGER than this, or you will not make enough parts.
THe three wire method works well with a super micrometer for straight threads. For tapered threads, the method gets a little more difficult and would require a master tapered plug. The most helpful people I have found for all things thread gage related in Thread Check Inc. Two doucments that might help are:
1. Control charts for x (with a line over it) and R are maintained for an important quality characteristic. The sample size is n=7. X (with a line over it) and R are computed for each sample. After 35 samples we have found that. (i) Calculate suitable limits for X (line) and R control charts using this Data.
5 accepted. 10 rejected. reject rate is a % of total production, which in this case would be [10/15]x100 = 66.7%. if you had 15 rejected then reject rate is [15/15]x100 = 100%, which shows reality. (by this definition, you can't reject more that you produce, you can't have a defect rate greater than 100%) *hope this helps*.