Thanks Nick, interesting, but probably outmoded.
Didn't NASA conclude that an experienced engineer with a conventional
wrench/spanner would always get closer to the optimum bolt tension
compared with an inexperienced person with a torque wrench? The problem
with torque wrenches is that they cannot compensate for friction when
you attempt to tighten a bolt or nut. What you're aiming to do is to
tension the bolt or stud sufficiently to prevent movement of the parts,
without exceeding the elastic limit of the bolt/stud. Unpredictable
friction against the parts and along the thread makes the relation
between bolt/stud tension and applied torque entirely arbitrary.
(The article alludes to this as "residual torque".)
NASA settled for bolt tension gauges when experienced engineers are
unavailable, but they're a bit pricey for geezers like us with bikes
to fettle.
Take home message: tighten until it "feels right", or maybe leave it to
an engineer.
--
Jan
On the road:'03 ST4s ABS (since April 2010), '99 M900 (since new)
Languishing: 'Guzzi V50 III & that legend of unreliability: a Lario!
Norwich, UK
Nick Alaniz, on Wed, Jul 27, 2011 at 07:03:26PM +0000 you wrote:
>
> Duck Masters,
>
> Thought you wrenchers might find this interesting.
> Chee-yoww, Nick Alaniz, 2002 Ducati ST4$, Sacramento, CaL.
> __________________________________________________________
>
> From: "Inc. Mountz" <sales@etorque.com>
> To: nicktoh@comcast.net
> Sent: Wednesday, July 27, 2011 11:15:03 AM
> Subject: Selecting the Proper Torque Wrench
>
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> Selecting the Proper Torque Wrench
>
> [TSN%20Cam%20Over%20Wrench%20Application.jpg] There are a wide variety
> of Preset and Adjustable torque wrenches and selecting the shape and
> size for your application can be easy. However, understanding the
> variety of torque delivery mechanisms of torque wrenches can be
> confusing.
>
> A Preset torque wrench is similar to a person setting an alarm clock to
> signal the achievement of a selected time. The wrench is preset to the
> required torque value of the application and then the tool signals the
> user when torque is achieved. A preset torque wrench must be preset
> using a torque analyzer. An �Adjustable� torque wrench features a
> torque scale that allows you to see and adjust the torque setting.
>
> There are three styles in which the wrench can signal achieving torque,
> either by a �click,� �break,� or �slip.� Each of three wrench styles
> has a specific purpose and utility. When you decide to spend the money
> for one, it�s important that you select the one that will do the job
> properly and not generically. [10]More >
> [spacer.jpg]
> Product Spotlight [qa_arrow.jpg] [11]Hand Tools
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>
> [12][product%20spotlight%20LB.jpg]
>
> Mechanical Torque Wrench Loader is a Laboratory Grade Instrument That
> Assures Accurate Torque Calibration With Less Effort
>
> The Loading Bench by Mountz Inc. is a laboratory grade instrument
> designed to enable accurate torque wrench calibration with less
> physical effort. The Loading Bench simulates torque application
> conditions with minimum effort and enhanced safety for the calibration
> technician assuring a more accurate calibration. The calibration
> instrument enables quick and easy torque wrench calibration and
> presetting, independent of human influence or transducer side and end
> load factors. The Mountz Inc. Loading Bench is designed to calibrate
> torque wrenches in accordance with International Standards
> ISO6789:2007.
>
> The drive system of the Loading Bench assures the load application
> eliminates potential operator induced test errors. Built for durable
> use, the Loading Bench reduces the operator effort required to attain
> and sustain torque during the calibration process. The Loading Bench
> features a large handle wheel, which operates in clockwise and
> counterclockwise directions to allow smooth manual loading.
>
> A torque wrench is considered a measuring tool and must be properly
> calibrated and maintained on a preventative maintenance and calibration
> schedule. The adjustable design of the Load Bench allows it to
> accommodate various size torque wrenches that can be tested with the
> unit. The gearbox design of the Loading Bench allows for high torque to
> be applied with minimum effort required from the calibration
> technician.
>
> Torque wrenches go out of calibration with use. Calibrating a torque
> wrench is a fine-tuning process of bringing the torque wrench back
> within its tolerance. The international standard for torque wrench
> calibration (ISO6789) mandates all conforming wrenches meet or exceed
> 5,000 cycles before requiring calibration.
>
> A torque wrench is a precision tool and should be treated and
> maintained like a measuring instrument. Using a quality torque wrench
> calibration system is important for many companies to ensure that
> proper torque is being applied and maintained for their quality
> requirements. [13]More >
> Torque Wrenches
>
> [Dial%20Wrench.jpg] Mountz offers a variety of torque wrenches with
> different shapes, sizes and torque delivery mechanisms. Conventional
> wrenches click when torque is reached, dial wrenches accurately measure
> torque and cam and break-over style wrenches apply desired torque while
> preventing over torque. Here is a brief rundown of the wrench styles
> that Mountz offers.
> [14]Cam-Over Wrenches
> Perfect for maintenance and production applications where over-torque
> conditions are not tolerated. Eliminates over torque.
>
> [15]Break-Over Wrenches
> Typically deflect 20-90 degrees on torque delivery, thus indicating
> torque has been reached. Limits torque applied & selection of end
> fittings.
>
> [16]Dial Wrenches
> Typically used as a quality control instrument to verify or monitor
> torque. However, some customers find them a resourceful production
> tool.
>
> [17]Digital Torque Wrenches
> Available in torque and torque/angle models used for production,
> auditing, joint validation as well as fastener testing. With and
> without memory. Entry level from $300
>
> [18]Click Wrenches
> Click wrenches are the most widely used torque product in the world.
> Variety of models available.
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> Once a torque specification is determined, the joint must be audited to
> ensure the product has been fastened to the specified torque. The best
> way to determine residual torque is by performing a "First Move" test.
> Mountz offers two best practices solutions for measuring residual
> torque.
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> About Mountz
> Mountz is a specialist in torque. We design and manufacture torque
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--
Jan
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