Model Forum / General / Models / July 2009

Looking for 6 off M20 x 220mm 12:9 HT bolts, plus real [1] nuts - any
ideas for a source?

Thanks,

-- Peter Fairbrother

[1] ie not "full" nuts that only fools would accept, but ones that are
at least 20 mm thick, and preferably thicker, eg 30 mm -

- just bought some M10 "full" nuts, which are 7.75 mm thick!

Anyone know how thick a full nut should be?

I'm guessing the major diameter plus an allowance of one pitch for the
rounded-off thread ends in the nut, but "officially" it might even be as
low as the minor diameter. Can't be less though, shurely?

(don't call mne ...

<rant>

I'm beginning to think that a whole lot of problems are caused by people
buying cheap stuff, and not realising that cheap stuff is too cheap to
do what they want... it may well be good enough for your job, if it will
do the job, but don't expect it to do the job of a "proper" component.

Thing is, nowadays, why did I have to put "proper" in inverted commas
(commae? - why not, it is from the Latin!)?

When the standard was "proper", then it was standard, and everyone knew
what it meant - something which would do the job in all cases, except
where a "special" wasn't required.

The standard might be overengineered for some jobs, but you knew it
could do the more demanding, but still non-special, jobs.

Unlike the overcheap stuff, eg the MT2/MT3 adapter I bought from Chester
(which wasn't particularly cheap anyway) which is more than 3 thou
non-concentric, and badly out on angle too.

Recently came across this, which is relevant, especially the "Restricted
rate of progression in UK welder training courses" section near the bottom:

http://www.weldsmith.co.uk/tech/edn/0901_BCweldcourse_present/index.html

"To an extent it is true that welding students trained under there
conditions will find working with the correct welding consumables and
conditions much easier later."

Hah! Overcheapness rules.

"The problems are

    * The welds learned are not commercial welds (and UK students are
often oblivious of this)
    * The student's time and effort is having much less value assigned
to it"

Hah! Overcheapness rules, again!

</rant>.