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:
>>>>> 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?
>
> The bit where you can't imagine 16 laser heads working together?
> Or that the technology mentioned above pumps fluid in at a rate of knots?
>
>>
>>>> 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".
>
> Don't be silly.
> Neither traditional laser sintering, nor the other technology I cited "squirt
> out something that has liquid properties" unless by "squirt" you mean "pump"
> into a tank.
>
> They are very different to a movable head which deposits material in a 3-D
pattern.
>
>>
>>>>> 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?
>
> Yes; and we're nowhere near the limits of those, the deposition rate FOR THAT
> KIND OF 3-D PRINTER, and multiple printer heads would solve that because,
> hardening time is not at its upper bound yet.
>
>>> 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.
>
> True for that kind of printer, at the moment, and you're still ignoring the
> other kinds of technology. It's getting embarrassing.
>
>>
>> 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.
>
> Just not true. FFS neither of the other two kinds of fabricator I mentioned
> work in that way. Read the article!
Since you are such a dense littlt twit, I will type slowly so that you
may understand.
A 3D printer consists of 3 primary system:
1: The postioning system.
This is the part of the machine that moves the deposition system, what ever
it may be, around.
This system is decended from XY protters and NC machinery, technology
that is over a half century old and fully matured shortly after the
microprocessor became commercially available over 40 years ago.
2: The deposition system.
This is the part of the machine that deposits the material being printed,
whatever it may be.
All deposition depend on the material having liquid properties, at least
for some time.
For thermoplastic printers the solid plastic is melted in the deposition
system and applied through a nozzle.
For metal printers, the solid metal is in a micronized form such that
it can be forced through a nozzle of some sort. The metal powder may
or may not have a carrier material added to make the process easier.
There is no way to "print" a material other than to squirt it in very
small quantities (assuming one desires some sort of accuracy) out
of a small oriface of some sort.
The accuracy of the final printed product is directly related to how
small an amount of material can be deposited at one time.
3: The hardening system.
This is the part of the machine that hardens the the printed material.
For a thermoplastic machine this may consist of nothing more than allowing
air flow around the printed such that a given print pass can cool before
the next print pass is applied.
For a metal machine, there are several hardening methods, such as laser
and electron beam sintering.
--
Jim Pennino
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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