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Re: Where does one get a wrench calibrated? Posted by TML [Email]  (#2212)  [Profile/Gallery]
(more from TML) on Fri, 2 Dec 2011 07:45:39
In Reply to: Where does one get a wrench calibrated?, Noel, Fri, 2 Dec 2011 07:04:55 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Not an easy question to answer. There's a lot of awful labs out there. Prices will range from $30 to $90 for a 1/2" drive wrench, and you don't always get what you pay for. Honestly, I'd be hesitant to send it to any place without seeing their lab, a sample of their certificate, and questioning them on their method. I know that's not of any help. It's a somewhat shady industry. Torque wrenches, at least most designs, are finicky and take time to get right. Manufacturers know that most end users are not going to calibrate them, so it doesn't even matter if they operate accurately. Labs know that the end user will not know if the calibration was done correctly (or at all) in most cases, so you're relying heavily on the personal integrity of the individual who does the certification as well as the policy of the lab. It doesn't help that a significant number of calibration customers would actually rather be lied to and have a piece of paper saying everything is fine than being told their wrench is not serviceable. With all that in mind, this is my advice:
Contact the lab, ask about their calibration method and ask to see a sample certificate. If they balk at either of these requests, run. They should mention following a recognised standard such as ASME B107, which is specific to torque. If they say ISO 9001, be wary; that is a quality management system that people like to use to give the aura of overall quality, but it really doesn't mean anything - it's NOT a certification or technical standard of any kind. The sample certificate should show readings being taken at 20%, 60% and 100% of the range, with a minimum of three samples at each setting. All samples must pass, so if they show averaging, or only one reading, run away. Ask if they have a mechanical loader, or if they hand pull the wrenches; if the latter, run away. If they are CLAS certified, or ISO 17025 accredited, that is a good sign, but will probably bump the price up. Smaller labs that might still be good are less likely to have the accreditation, because it's very expensive to acquire.
posted by 24.246.55...
, Fri, 2 Dec 2011 13:40:58, Fri, 2 Dec 2011 17:36:58, Fri, 2 Dec 2011 13:34:38
, Fri, 2 Dec 2011 07:27:06
, Fri, 2 Dec 2011 11:13:45, Fri, 2 Dec 2011 08:00:02, Fri, 2 Dec 2011 06:09:24, Fri, 2 Dec 2011 07:45:39 <-- Viewing This Message, Fri, 2 Dec 2011 07:29:46
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