On 4/5/2013 5:46 PM, Gregg Eshelman wrote: > --- On Fri, 4/5/13, Viesturs Lācis <[email protected]> wrote: > >> 2013/4/5 dave <[email protected]> >> >>> Hi all, >>> >>> The wiki for buttress threads states the buttress >> threads tend to fail >>> because only the first 4 threads are load bearing. >>> >> Not really true, all threads are bearing the load, it is >> just that due to >> elasticity of material first one has the most, last one has >> the least load. >> I have formulas to calculate, what percentage of the load >> does each thread >> take somewhere in my notes from last year. Basically the >> rule of thumb is >> that first three threads take approximately 75% of the load >> and it does not >> make much sense to have more than 8-10 threads. > That must be what the Ford engineers thought when they made all those > overhead cam V8 engines with only 4 threads in the spark plug holes. Theory > met reality and failed. The threads fail and the spark plugs blow out. > Weeeellll, let's not forget the confounding effect of over-/under-tightened sparkplugs. In almost every one of the 5 cars I've owned, the mechanics have had a bigger impact than the engineers. Reality can bite in so many ways.
Regards, Kent ------------------------------------------------------------------------------ Minimize network downtime and maximize team effectiveness. Reduce network management and security costs.Learn how to hire the most talented Cisco Certified professionals. Visit the Employer Resources Portal http://www.cisco.com/web/learning/employer_resources/index.html _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
