XPost: sci.space.policy, sci.physics, sci.electronics.design   
      
   In sci.physics David Mitchell  wrote:   
   > jimp@specsol.spam.sux.com wrote:   
   >> In sci.physics David Mitchell  wrote:   
   >>> jimp@specsol.spam.sux.com wrote:   
   >>>> In sci.physics David Mitchell  wrote:   
   >>   
   >>    
   >>   
   >>>>> Not really - for example, if we're not at the limits of layer hardening   
   time,   
   >>>>> then we can use multiple print heads, multiplying the print rate.   
   >>>>> I thought that was apparent, apparently I needed to explain it.   
   >>>>   
   >>>> But we are at those limits as well as how fast we can lay down a layer   
   >>>> without slopping it around.   
   >>>>   
   >>>> Did you think the issue is how fast a stepper motor goes or how fast you   
   >>>> can squeeze something out of a nozzle?   
   >>>   
   >>> First of all, there are other technologies, the second of the new printers   
   I   
   >>> posted uses one of them.   
   >>   
   >> All the technologies squirt out something that has liquid properties and   
   >> then is hardened somehow, all of them.   
   >   
   > Apart from those which don't, such as laser sinterers, or those, such as the   
   one   
   > I linked to, which hardens a resin with a laser.   
      
   What part of "is hardened somehow" did you fail to understand?   
      
   >> There are no Star Trek replicators where a complete object forms out of   
   >> thin air.   
   >   
   > No-one has ever claimed there are.   
      
   You were by claiming there are "other technologies".   
      
   >>> Second, even something as simple as adding more print heads would multiply   
   the   
   >>> printing speed, as I've explained twice now.   
   >>   
   >> What part of we are already at the limit of deposition rate is it you can   
   not   
   >> grasp?   
   >   
   > The part where you saying it makes it true: it's not.   
   > Unless you can prove me wrong, it's your claim after all, so feel free to   
   > provide evidence.   
      
   What do YOU think limits deposition rate, the speed of stepper motors?   
      
   >>>>>>> "The BAAM was used to manufacture the first (almost) fully 3D printed   
   car, the   
   >>>>>>> Strati, for together with Local Motors. With a deposition rate of up   
   to 38 lbs   
   >>>>>>> of material per hour, it is possibly the fastest machine currently on   
   the market."   
   >>>>>>>   
   >>>>>>   
   >>>>>> The Strati is little more than a $30,000 golf cart and the finish is an   
   >>>>>> abomination.   
   >>>>>   
   >>>>> Not the point, remember the whole "mature technology" thing?   
   >>>>> If we can do that *now*, imagine what we'll be able to do in 30 years   
   time.   
   >>>>   
   >>>> Yes, it is the whole point.   
   >>>>   
   >>>> They get speed by using thick layers as there is no other way to do it.   
   This   
   >>>> results in a crap finish.   
   >>>   
   >>> Simply not true, see my points above.   
   >>   
   >> Yes, it is true. Look at the pictures of the thing and read the companies   
   >> own press releases.   
   >   
   > There were two links posted - I notice you're completely ignoring the second.   
   > There are also other kinds of 3-D printer, and different types will be   
   invented.   
   > Can you honestly not see that, or are you just ignoring it, because you know   
   > you've lost this particular argument?   
      
   I see you are ignoring the close up photo showing that what I said is true.   
      
   And again, there is only one type of 3D printer; a machine that takes   
   a material that has fluid properties and deposits it in thin layers   
   which are then hardened.   
      
   It makes no difference if the material is thermoplastic that has been   
   heated and then allowed to cool or micronized metal particles which are   
   then sintered together with a laser or electron beam machine.   
      
   --   
   Jim Pennino   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)