Perciuliar American threads trivia question

Why does model making need BA threads? The Americans use there numbered

Because most of them have coarse threads and look quite inappropriate; also the various members of these series are too far apart. The 10% steps in the BA series gives a very fine degree of choice.

Have you actually *used* BA threads? I ask because most US model engineers have no idea what they are, or at least never get to se them. Their loss.

David

-- David Littlewood

Yes I have used BA.

If you are making a scale model why change the tread angle so much

Using metric coarse as a comparison

M6-M1.6 is 8 threads with, M6 at 6mmOD x 1mm pitch, M1.6 at 1.6mmOD x0.35mmP Average pitch reduction 0.86 steps

Doesnt look that big a change and thats without using fine series.

Stev

-- Steve Larne

----------------------------------------------------------------------- Steve Larner's Profile:

Thats buggered the west coast line over power cable stanchions then :-)

STeve

Nothing to stop Railtrack's subbies using _lots_ of them :-)

Mark Rand RTFM

You generally won't get far asking for them in a UK bolt supplier ;-)

Tim

Since this is a .uk group, I guess you get to call those threads peculiar. ;)

Wes

Michigan, USA.