sancho57
Member
- Joined
- Jan 13, 2011
- Messages
- 7,089
[member=60461]Bob D.[/member]
Exactly so anything anyone here has done to make comparisons between various rules, rails, whatever is "Information Only" unless the measurements were taken with calibrated equipment under controlled conditions.
Information Only in the QA world means the instrument used to take the measurements are not deemed accurate. They are a referance only instrument that can not be used to a final inspection of a product
The guide rails have no stated accuracy for hole spacing that I am aware of, there is no calibration sticker or accuracy statement stamped on my LR32 rail anyway.
There would not be a calibration sticker on a guide rail. The calibration would have to be on the measuring equipment used to measure the guide rail.
The guide rail is not calibrated rathing it is manufactured with in certain tolerances IAW the manufacturers specifications.
The measureing equipment would have to be calibrated to a standard for known accuracy. In order to verify that the guide rail meets those tolerances as specified on the manufactturers specifications.
Seen it happen all the time. Some mechanic/ tech would drop his caliper not get it checked for accuracy after the drop and it could be out of calibration more than .5mm.
It also should be recalibrated on a regular schedule. Usually annually though some manufacturers use usage meaning how many times a caliper is used to check a part.
So for you to claim its the LR32 guide rail out of tolerance is misleading in that you do not know the ambient temp the control of the place where the inspection has taken place or the manufacturers specifications /tolerances or the accuracy of te process used to check the holes of the guide rail for accuracy As already been shown in this thread metal moves in uncontrolled enviroment to..
Even production items made with a CNC have tolerances and are inspected usally the begining, middle and towards the end of a run to ensure the items are being manufacture IWA the anufactured specifications which has a +/- tolerance and is and charted using statistical process controls (SPC) with upper/lower control limits. The .5 mm could very well be with in those limits.
Festool like any manufacture will not give out that information as it is considered Proprietary. To protect themselves from other manufacturers stealing their designs. Most companies wont even allow inspectors to bring camera or Phones with camera into their facilities because they are afraid of losing their trade secrets.
Exactly so anything anyone here has done to make comparisons between various rules, rails, whatever is "Information Only" unless the measurements were taken with calibrated equipment under controlled conditions.
Information Only in the QA world means the instrument used to take the measurements are not deemed accurate. They are a referance only instrument that can not be used to a final inspection of a product
The guide rails have no stated accuracy for hole spacing that I am aware of, there is no calibration sticker or accuracy statement stamped on my LR32 rail anyway.
There would not be a calibration sticker on a guide rail. The calibration would have to be on the measuring equipment used to measure the guide rail.
The guide rail is not calibrated rathing it is manufactured with in certain tolerances IAW the manufacturers specifications.
The measureing equipment would have to be calibrated to a standard for known accuracy. In order to verify that the guide rail meets those tolerances as specified on the manufactturers specifications.
Seen it happen all the time. Some mechanic/ tech would drop his caliper not get it checked for accuracy after the drop and it could be out of calibration more than .5mm.
It also should be recalibrated on a regular schedule. Usually annually though some manufacturers use usage meaning how many times a caliper is used to check a part.
So for you to claim its the LR32 guide rail out of tolerance is misleading in that you do not know the ambient temp the control of the place where the inspection has taken place or the manufacturers specifications /tolerances or the accuracy of te process used to check the holes of the guide rail for accuracy As already been shown in this thread metal moves in uncontrolled enviroment to..
Even production items made with a CNC have tolerances and are inspected usally the begining, middle and towards the end of a run to ensure the items are being manufacture IWA the anufactured specifications which has a +/- tolerance and is and charted using statistical process controls (SPC) with upper/lower control limits. The .5 mm could very well be with in those limits.
Festool like any manufacture will not give out that information as it is considered Proprietary. To protect themselves from other manufacturers stealing their designs. Most companies wont even allow inspectors to bring camera or Phones with camera into their facilities because they are afraid of losing their trade secrets.
