| ??? 01/13/06 10:52 Read: times |
#107257 - BA Responding to: ???'s previous message |
John D. Maniraj said:
I prefer the Metric system, imagine working with 3/8", 3/4", 1/2", fasteners. SI threads are stupid in small instruments, being a linear series. The oldest metric thread system was called "BA" (British association), and was a nice logical logarithmic series, which made it much easier to select a fastner to suit a job. The thread pitch was also finer, so in small sizes the screw is stronger. The largest BA size was 0BA ,the smallest 25BA. The 25BA is 0.25mm across, and has over 15 threads/mm http://www.sizes.com/tools/thread_BA.htm Might be of interest. Steve |
| Topic | Author | Date |
| what a group | 01/01/70 00:00 | |
| ah well | 01/01/70 00:00 | |
| Strange happenings | 01/01/70 00:00 | |
| I grew up using only metric in Denmark, | 01/01/70 00:00 | |
| metric | 01/01/70 00:00 | |
| Mexico metric | 01/01/70 00:00 | |
| Complex units | 01/01/70 00:00 | |
| eggs and dozen | 01/01/70 00:00 | |
| Depends | 01/01/70 00:00 | |
| the voltage is one thing | 01/01/70 00:00 | |
| No. | 01/01/70 00:00 | |
| Only one | 01/01/70 00:00 | |
| UK Mains is 240V | 01/01/70 00:00 | |
| any guess how much copper would be saved | 01/01/70 00:00 | |
| copper saving | 01/01/70 00:00 | |
| Nominal | 01/01/70 00:00 | |
| Possibly? | 01/01/70 00:00 | |
| imperial | 01/01/70 00:00 | |
| Who ? Us ? | 01/01/70 00:00 | |
| rockets and cars | 01/01/70 00:00 | |
| The right side of the road | 01/01/70 00:00 | |
| driving directions | 01/01/70 00:00 | |
| oh yeah | 01/01/70 00:00 | |
| Ignore? | 01/01/70 00:00 | |
| The Space Shuttle and a horse's behind | 01/01/70 00:00 | |
| Brunel | 01/01/70 00:00 | |
| Ariane | 01/01/70 00:00 | |
| That was Ariane 2 | 01/01/70 00:00 | |
Mars shot | 01/01/70 00:00 | |
| Forgot that! | 01/01/70 00:00 | |
| Imperial | 01/01/70 00:00 | |
| collars and cuffs | 01/01/70 00:00 | |
| Cheap Shot. | 01/01/70 00:00 | |
| British and Metric | 01/01/70 00:00 | |
| apparently | 01/01/70 00:00 | |
| kilogram | 01/01/70 00:00 | |
| kilogram? | 01/01/70 00:00 | |
| Prototype | 01/01/70 00:00 | |
| BA | 01/01/70 00:00 | |
| Whitworth | 01/01/70 00:00 | |
| Whit | 01/01/70 00:00 | |
| Whitworth...and then BSP | 01/01/70 00:00 | |
| BSP | 01/01/70 00:00 | |
| Eh? | 01/01/70 00:00 | |
| Here | 01/01/70 00:00 | |
| re: Here | 01/01/70 00:00 | |
| What about the Japanese and Swiss? | 01/01/70 00:00 | |
| Speed limits | 01/01/70 00:00 | |
| More changes afoot | 01/01/70 00:00 | |
| they did that in Sweden | 01/01/70 00:00 | |
| traffic circles | 01/01/70 00:00 | |
| Traffic Circles? | 01/01/70 00:00 | |
| Roundabouts | 01/01/70 00:00 | |
| Fun you say that ! | 01/01/70 00:00 | |
| Don't mention aircraft | 01/01/70 00:00 | |
| Canada | 01/01/70 00:00 | |
| TTT | 01/01/70 00:00 | |
| cultural differences II | 01/01/70 00:00 |