[modeleng] Re: To BA or not to BA, that is the question.

With apologies to anyone who thinks that this thread is going on too long,
this is an interesting post of yours Clif, especially in view of what has
already been posted about the aesthetics of head sizes! My worry is that I
will not be able to find these BA nuts and bolts, and I seem to remember a
similar post a while back on someone else's similar problems. The question
has to be are there any millimetre to the foot scale models that would
require metric threads, or do Imperial scales still rule in the world of
model engineering?

In the meantime I shall be checking both the Chronos and Millhill web sites
for the availability of BA fittings, to see if my earlier decision of being
totally metric was the right one or not. I have realised that I have a lathe
with only Imperial change gears, by the way, and whilst Tel sent me a chart
of approximations for cutting metric threads (thanks again Tel), it does
seem to be going in the  wrong direction for SCALE modelling.

As my existing taps and dies are standard metric sizes, the talk of 
possibily having to go onto Metric Fine raises an interesting question - 
would they be the same price as the set of BA ones and so I would not save 
any money if I had to buy them to augment my standard metric ones? When I 
did my original costings, the sets only covered from 0BA to 10BA, with 11BA 
and 12BA still to be priced out. Are these two additional sizes used much, 
or even at all please? Do I have to include them in my costings to give a 
true comparison with a comprehensive set of Metric Fine ones?

Tony.


----- Original Message ----- 
From: "Clif Walker" <clif.gwr@xxxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Saturday, August 27, 2005 11:29 AM
Subject: [modeleng] Re: To BA or not to BA, that is the question.


> Hi Tony and All,
>
> The main difference is that you can get BA nuts and bolts with reduced
> heads
> which are needed to look right in some places. However I do not think that
> you can get metric ones with the same facility. Therefore whilst you could
> use metric where they do not show, if you want a model to look right,you
> will have to use BA in some locations.
> You will also find that things like hand rail knobs have BA threads so you
> are going to finish up with a mixture of nuts and bolts eventually.
> The joke is that BA threads are basically metric anyway.
>
> Regards
>
> Clif
> ----- Original Message ----- .
>
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