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Re: Status Update on the planned build

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  • pzamov
    ;-)
    Message 1 of 40 , Jul 31 11:14 PM
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      ;-)

      --- In diy_3d_printing_and_fabrication@yahoogroups.com, "Boman33" <boman33@...> wrote:
      >
      > A few thoughts before you start:
      >
      > 1. You are having a linear stage lowering the vat. If you are going
      > that way, why not just pull up the Z and lower it again? A zero backlash Z
      > would achieve the same result.
      >
      > 2. Moving straight up or down opens the area symmetrically. The
      > commercial designs we have seen lowers only one side of the vat which forms
      > a wedge shaped opening and closing.
      >
      > 3. The really interesting one is to have a silicon rubber sheet on the
      > bottom of the vat that will pull up with the Z and then gradually peel off
      > from the edges as discussed in the 7,438,846 patent.
      >
      > Good luck with your build!
      >
      > Bertho
      >
      > ==================================
      >
      >
      >
      > From: pzamov Sent: Sunday, July 31, 2011 15:32
      > I have the major parts:
      >
      > projector
      > 1" travel linear stage ( for vat lowering )
      > 6" travel linear stage ( for Z )
      > NEMA23 motor
      > NEMA17 motor
      > IMS - stepper controllers
      > Breakout Parallel board
      > power supply 36V 6A ( since the motors will be moving one at a time and one
      > is a NEMA17 it should be enough )
      >
      > I have ordered the Bosch-Rexroth Framing - should be here tomorror ( Monday
      > ) I'll start the build 5-6 of Aug.
      > I still have a few other little things and tools to get to.
      > So It Begins...
      >
    • Fernando
      See? there you have a reason! :) Thanks Bertho, good weekend there too!
      Message 40 of 40 , Aug 6, 2011
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        See? there you have a reason! :)
        Thanks Bertho, good weekend there too!

        On Sat, 2011-08-06 at 06:30 -0400, Boman33 wrote:
        >
        > It is much too big to start with; thousands of Newtons force. It is a
        > DC motor so it will be difficult to control. It only has a crude
        > shaft encoder using reed switches and there is no specification on
        > backlash or accuracy/play of the mechanical movement.
        >
        > Have a great weekend,
        >
        > Bertho
        >
        > ==========================
        >
        >
        >
        > From: Fernando Sent: Saturday, August 06, 2011 04:29
        > Has anybody thought about using this kind of actuator for z-axis or
        > tilt
        > mechanism?
        > http://www.linak.com/products/Linear-Actuators.aspx?product=LA29
        >
        > Again, I'm a complete noob and wonder why these are not being
        > considered. I'm sure there must be a reason but don't know which.
        >
        >
        >
        >
        >
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