J
jim beam
Guest
i come back from vacation, and what do i find? more r.b.t. ridiculousness.
viz:
Mark Hickey wrote:
> I'll bet you $1000 that, all other things being equal (OD, wall
> thickness at the ends) that a straight gauge 3/2.5 tube IS stiffer
> than a butted 6/4 tube.
a "bet" on something you could instead calculate? that's illogical
since you don't bother to define all relevant terms leaving me to
specify my own butted tube wall thickness. i could therefore trade the
different modulus for the two materials and specify butting thickness
that would win that "bet". and all this is ignoring the fact that the
majority of the stiffness you're trying to sell me is needed in the
joins since that's where the majority of stress is concentrated. since
you /do/ specify the same thickness for the two different materials in
this region, the higher modulus tube "wins" again.
it's ridiculous to "bet" without bothering to properly define terms. i
suggest you deploy your money for something useful [like a book, which
you bother to read] and some test gear, something you so diligently
avoided earlier and from which you as a "manufacturer" would
substantially benefit.
viz:
Mark Hickey wrote:
> I'll bet you $1000 that, all other things being equal (OD, wall
> thickness at the ends) that a straight gauge 3/2.5 tube IS stiffer
> than a butted 6/4 tube.
a "bet" on something you could instead calculate? that's illogical
since you don't bother to define all relevant terms leaving me to
specify my own butted tube wall thickness. i could therefore trade the
different modulus for the two materials and specify butting thickness
that would win that "bet". and all this is ignoring the fact that the
majority of the stiffness you're trying to sell me is needed in the
joins since that's where the majority of stress is concentrated. since
you /do/ specify the same thickness for the two different materials in
this region, the higher modulus tube "wins" again.
it's ridiculous to "bet" without bothering to properly define terms. i
suggest you deploy your money for something useful [like a book, which
you bother to read] and some test gear, something you so diligently
avoided earlier and from which you as a "manufacturer" would
substantially benefit.