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3D - Printing
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 Posted: Sun Sep 4th, 2011 04:40 am
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Lucas Gargoloff
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Great stuffs Daniel!!!



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 Posted: Sun Sep 4th, 2011 09:17 am
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Daniel Osvaldo Caso
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Lucas:

         Thank you.
I assume you are reffering to the good part of it and looking at the rest with a forgiving, tolerant spirit
... or an incredible dose of humour!

 
                                                 Daniel

                                                                       



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 Posted: Sun Sep 4th, 2011 02:47 pm
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Herb Kephart
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Daniel

One of the reasons that the second group of parts was unusable is in fact 'Shapeways' fault, I think.

My son manages a medical device prototype shop where they have a 3D printer,
so I know a little about what they are capable of.

The first pieces were done with a small increment of step over of each pass of the printer head, but this takes a lot of time.
Small amount of step over = many more passes = more time.

Probably 'Shapeways' realized that this would cause the parts to be overly expensive,
so they stepped up the amount between passes of the printer head,
and possibly the speed of the head also = lack of quality.

If I were you,
I would go back to them and ask that they run the programs again with the minimum amount of step over (.125mm?).
Explain that you are willing to pay for one or two perfect pieces of each item.
Then, make RTV molds of these, and cast the parts in urethane. 

My dos Pesos

Herb 




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 Posted: Sun Sep 4th, 2011 06:10 pm
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W C Greene
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Daniel-I might suggest going way back for the portable ties..how about stamped steel, like old Lionel, etc.?? Yes, I know that the DC and DCC guys would have to insulate but the r/c guys would love them. The fine scalers could have lost wax cast rail chairs/fixings and commercially available rail. I do know that metal track would last far longer than resin track. Herb has dos pesos, I have tres pesos y no mas. Excellent work, old friend.
Woodie



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 Posted: Sun Sep 4th, 2011 06:46 pm
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Daniel Osvaldo Caso
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Herb:

    Thank you for that.
I've just sent a message to 'Shapeways' with a set of comparison pictures and your arguments asking them to clarify.
    If they did what you say they are being too smart (= stupid) because will make them loose a lot of clients.

    I thought about using 3D printings as patterns,
but most things are much too complicated to be cast in one piece,
and those that could would need two part moulds.
Too complicated and too much work to make them commercially.


                      Daniel




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Extract from "THE FOUR STEPS METHOD" by Ching Pang Tsè:
" 1) bCalm down.
2) Calm down.
3) Calm down.
4) first calm down."
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 Posted: Sun Sep 4th, 2011 06:46 pm
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sledhead
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I agree Herb, right now this technology is best suited for one master, using is for production level high quality parts is far too expensive, and to cut costs the quality drops precipitously.

I looked into this after having mixed experiences with the one at my college. I came away still less than convinced. The fine detail material also has far less elasticity than urethane. And urethane isn't exactly known for being highly forgiving.



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 Posted: Sun Sep 4th, 2011 06:53 pm
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Daniel Osvaldo Caso
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Woodie:

       Thank you.

       Just cutting a mould for stamping the sleepers would cost more than several thousands of 3D printed ones from which, I guess,  more or less 50% would be o.k.

       Before I started with 3D P I was thinking about etched>>>folded ones.

       But for the time being I have enough sleepers for myself (and a bunch of useless ones!) which wouldn't be a problem for my 1/2 RCC alocomotive.(the other 1/2 must still be built!)
       Also etched or stamped ones would miss the fine detail of the plates and bolts.


      The rails in my pictures are not printed but metal. Just the sleepers are printed.

                      Daniel

      



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Extract from "THE FOUR STEPS METHOD" by Ching Pang Tsè:
" 1) bCalm down.
2) Calm down.
3) Calm down.
4) first calm down."
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 Posted: Mon Sep 5th, 2011 12:29 am
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W C Greene
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Daniel-just grind out a die and stamp them while watching TV or listening to Bach. You'd be amazed at how many could be made that way. You should already know that I play the "devil's advocate".....
Woodie
PS-the plates, etc. could be lost wax brass castings..just mi dos centavos



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 Posted: Mon Sep 5th, 2011 08:52 am
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Daniel Osvaldo Caso
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Woodie:

           You...Old agitator!!!

           Always provoking modelling guerrillas!!!

                                 #:-)


  Now seriously:


Thank you.


Bart Donker. a fellow Duch modeller -I think he posted here some pictures a couple of years ago- ordered from a prof. a simple device for stamping such metal sleepers in brass for 32mm gauge. The result wasn't too convincing: the bends of the metal where much too gentle to be convincing even when the steel mould had very sharp angles. I supose it would need a lot of pressure to form good angles in brass.

  Anyway for the time being I have enough printed sleepers for I am going to do and all I need it to get the ones for building switches. But I want them to have same detail as the normal ones.


                        Daniel
 



____________________
Extract from "THE FOUR STEPS METHOD" by Ching Pang Tsè:
" 1) bCalm down.
2) Calm down.
3) Calm down.
4) first calm down."
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 Posted: Fri Sep 9th, 2011 09:06 pm
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Daniel Osvaldo Caso
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Well, finaly I've got an clear answer from Shapeways. They say the layering is due to the orientation of the models in the machine's box and they won't intervene to change the orientation decided by the computer program. Their last word is : This is 3D printing. In other words: take it or leave it.

I still have a couple of orders pending and probably will use their service a couple of times more for personal modelling, but my advice to those hooping to sell their designs is: don't fool yourself and don't fool potential clients. You can't guaranty an acceptable product. If you still want to keep offering any designs, let your clients know in advance what they may be receiving for their money.

 

                             Daniel



____________________
Extract from "THE FOUR STEPS METHOD" by Ching Pang Tsè:
" 1) bCalm down.
2) Calm down.
3) Calm down.
4) first calm down."
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