bodger
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| posted on 26/4/07 at 02:22 PM |
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bolts & washers
When is it considered good engineering practice to put a washer under the bolt head & when should you leave it off ?
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Bluemoon
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| posted on 26/4/07 at 02:24 PM |
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You should use one on the bolt/nut that is to be turned durring tightening.
Dan
[Edited on 26/4/07 by Bluemoon]
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locoboy
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| posted on 26/4/07 at 02:28 PM |
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Is that simply to stop the turning bit wearing away the thing your clamping with the nut/bolt?
I put them on the bit im tightening but only because it stops my socket or spanner taking the paint off the thing im clamping..........is that good
enough engineering practice for you
ATB
Locoboy
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Bluemoon
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| posted on 26/4/07 at 02:34 PM |
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No sure locoboy I guess it's to ensure that the coefficent of friction is the same/predictable so you can torque them up correctly? Anyhow this
method also stops the paint comming off as you say!
Dan
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gazza285
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| posted on 26/4/07 at 02:39 PM |
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Make sure that the washers are the right way round too. They usually go under the nut as it is the nut that should be turned. If you turn the bolt
then you risk thread damage is it is binding anywhere. Unless it is a blind hole, then it depends on what you are tightening and how accurately you
want the bolt torque to be as washers can lead to false torque readings.
Simple eh?
DO NOT PUT ON KNOB OR BOLLOCKS!
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Mal
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| posted on 26/4/07 at 03:05 PM |
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Washers
I agree with the previous comments if a bolt is clamping rigid metal parts, but washers also serve to spread load when clamping weaker or deformable
materials, such as sheet aluminium, GRP, other plastics or wood.
Mal
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designer
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| posted on 26/4/07 at 03:06 PM |
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Unless the bolts have special heads - always use a washer.
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BenB
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| posted on 26/4/07 at 03:22 PM |
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Put them under both, only turn the nut not the washer...
Belt and braces
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02GF74
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| posted on 26/4/07 at 03:39 PM |
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quote:
Originally posted by designer
Unless the bolts have special heads - always use a washer.
hmmm, crossflow engines cyclinder head bolts don't have washers nor do the heads look special ????
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Bluemoon
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| posted on 26/4/07 at 04:40 PM |
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As is maybe but ford will have don repeated tests to find the correct torque setting for this combination of head/bolt...
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ScotJebus
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| posted on 26/4/07 at 05:38 PM |
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since they are proberly strech bolts a washer would mess with the strecheness? id say use washers to spread the load protect what is being scrwed into
and so that they look nicer!
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