[modeleng] Re: 12ba Screws

On Thu, 24 Feb 2005, BarriePurslow wrote:

> Hi John,
>
> > Barrie if you are having a problem getting a spanner or socket for your
> 12BA bolts perhaps there might be an alternative in the current A/F or
> Metric range.
>
> The problem is not with the spanner. The problem is that the hex heads are
> too large. Almost the last job on my 5" King was to make and fit the pipe
> covers to the top feeds, they are to be held on to the cladding with sixteen
> 12ba screws. The oversize screw heads do the job but, to my eyes, they just
> look that bit too big. They are nearly 10% oversize A/F which means nearly
> 20% on area.

Isn't it more than 20% (as opposed to nearly)?

1.1 squared is 1.21 - ie if the AF is 10% bigger, then the area is 21%
bigger - and as say the eye picks up on the area of metal showing as well
as just is dimensions.

Yours,


Rich.

> I know its all a bit fastidious but I'm trying hard not to let standards
> drop just to get it finished. Besides which this cold weather makes it
> impossible to paint so, more time to get the details right!
> I am waiting a reply from Doug Hewson (good idea, Andy). He's pretty
> fastidious too.
>
> Thanks to all who have contributed to this.
>
> Barrie
>
>
>
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