What's your favourite thread size?

[oddball1313]

Tango13 said:

I used to do a lot of 10-32 UNF years ago and M46 X 2mm was another favourite.

Never been a fan of the BA threads or BSPT either.

I can see where people are coming from with their love of the M6 X 1mm though and I do enjoy watching our RoboDrill tapping an M6 at 8,000rpm

I just sold a very nice T21 Robodrill today with a 24000rpm spindle. Back on threads the one that pisses me off is 1/2 BSW and 1/2 UNC being 1TPI different to each other, why when every other size has the same TPI????

[leigh1050]

My favourite is 16mm followed by 20mm! Going to be playing with 27mm in a couple of weeks.

[dudleybloke]

Making or using?

[Tango13]

oddball1313 said:

Tango13 said:

I used to do a lot of 10-32 UNF years ago and M46 X 2mm was another favourite.

Never been a fan of the BA threads or BSPT either.

I can see where people are coming from with their love of the M6 X 1mm though and I do enjoy watching our RoboDrill tapping an M6 at 8,000rpm

I just sold a very nice T21 Robodrill today with a 24000rpm spindle. Back on threads the one that pisses me off is 1/2 BSW and 1/2 UNC being 1TPI different to each other, why when every other size has the same TPI????

Our RoboDrill is the high power 24,000rpm version but it only taps at 8,000rpm, still a bloody amazing machine considering it's only a BT30 spindle.

The next big question is how do people like to make their threads? Rolling, tapping, turning or my personal favourite helical interpolation

[InitialDave]

Tango13 said:

Our RoboDrill is the high power 24,000rpm version but it only taps at 8,000rpm, still a bloody amazing machine considering it's only a BT30 spindle.

The next big question is how do people like to make their threads? Rolling, tapping, turning or my personal favourite helical interpolation

Don't forget thread milling.

[dudleybloke]

For rolled threads a Waterbury Farrel plate die thread roller is satisfying to use but the simpleness of a Fette roller is hard to beat.
For chasers I'm a Coventry man, Landis come a close second then Namco.
Most satisfying is single point turning a large thread.

[Kawasicki]

Big-Bo-Beep said:

you,re all f8*8ing nuts.

Screw you!

[Glade]

Wile E Coyotoe prefers ACME

[oddball1313]

Tango13 said:

oddball1313 said:

Tango13 said:

I used to do a lot of 10-32 UNF years ago and M46 X 2mm was another favourite.

Never been a fan of the BA threads or BSPT either.

I can see where people are coming from with their love of the M6 X 1mm though and I do enjoy watching our RoboDrill tapping an M6 at 8,000rpm

I just sold a very nice T21 Robodrill today with a 24000rpm spindle. Back on threads the one that pisses me off is 1/2 BSW and 1/2 UNC being 1TPI different to each other, why when every other size has the same TPI????

Our RoboDrill is the high power 24,000rpm version but it only taps at 8,000rpm, still a bloody amazing machine considering it's only a BT30 spindle.

The next big question is how do people like to make their threads? Rolling, tapping, turning or my personal favourite helical interpolation

I’ve got a nice ORT RP18 thread roller for sale...

Ever tried a Komet JEL which drills the pilot hole and then threads mills it in one op?

https://youtu.be/wilMS20S_io

[fourfoldroot]

Huntsman said:

M7. Love the quirkyness,

Unless of course we're not just talking metric, in which case, i just love BA!

BSP - nasty mess!

I always thought I was alone and a threads nerd.

Technically BA threads are metric, which all thread nerds kno........
Anyway, my favourite is 1/4 whitworth, holding together Austin Sevens all round the world.

[Essel]

Glade said:

Wile E Coyotoe prefers ACME

That will truncate the thread.

[Sochaux]

Has to be M12.

M12 structural CE Bolts to EN15048 require use of an 18mm spanner rather than the 19mm.

[BigRusko]

I see theres no love for UNJF threads?

[generationx]

The Kyosho Optima used to have some delightfully rare M2.6 screws - difficult to replace, easy to damage as they were part of the steering assembly.

I've just designed something with a lovely M103x1.5...

[simonh9]

Depends where. Engine bay, or somewhere dryish, I like an M8 as a nice balance between size and strength to moderately hold something together. Also not too difficult to drill out in the worst case

If it's underneath and exposed, then M12 for strength (i.e. you shouldn't snap it and it has a big head that should be less easy to round).

M7, grr. Never have any spares.

[wolfracesonic]

I saw these the other night on some documentry, wooden nuts and bolts. They were used to hold this together Atlas 1 TRESTLE metal being no good as they wood skew the test results. Not sure what pitch they are, maybe there is a web page with a load of thread pitch geeks on

[glenrobbo]

Essel said:

I used to be a shop floor quality inspector many, many years ago.

Why on earth would anyone go around inspecting the quality of shop floors?

[Huntsman]

fourfoldroot said:

Technically BA threads are metric, which all thread nerds kno........

Not so.

Iso metric standard has a 60 deg thread form.

BA thread form is 47.5 degrees.

BA does not have the truncated top and bottom of the form like metric.

Its true that the BA starting point is a nominal 6mm diameter and 1mm pitch, but the series is most certainly not metric.

[cobra kid]

3/4" BSW threaded bar. We use it all the time in the lab.

[cobra kid]

dudleybloke said:

For rolled threads a Waterbury Farrel plate die thread roller is satisfying to use but the simpleness of a Fette roller is hard to beat.
For chasers I'm a Coventry man, Landis come a close second then Namco.
Most satisfying is single point turning a large thread.

Dirty boy.