Re: More Stratasys Questions

From: JBVentures (info@jbventures.nl)
Date: Mon Oct 23 2000 - 11:33:17 EEST


For Stratasys claiming to be world-leader in sales-units of RP Machines, the amount of response of it's users to this question is overwelming!

Jorn Berends
JB Ventures BV - the Netherlands
  
    -----Original Message-----
    From: RP Solutions <rps@dircon.co.uk>
    To: rp-ml@bart.lpt.fi <rp-ml@bart.lpt.fi>
    Date: Thursday, October 19, 2000 1:32 PM
    Subject: More Stratasys Questions
    
    
    Hi List,
    
    I have saved up a few questions that have been bugging me over the last few months.
    
    Question 1.
    Model Warping on the Stratasys FDM 8000: we have been making sand casting masters (typically 500mm cubed) recently which have sections 5-10mm thick in places, if we create solid parts they tend to warp/bend around the base area (sometimes the geometry of the parts determines the orientation).
    
    My guess is that the parts are warping due to a build up of heat from the build filament, to try and counteract this we have done the following:
    
    1.Create a honeycomb structure with Part Cross Hatch command in Quickslice 6.1( this works OK but parts have to be checked manually to ensure that they have no holes )
    
    2. Create a support base 20 layers thick.( this works OK when used with the above )
    
    3. Create "feet" in modelling material to help anchor the part more securely to the foam base. ( does'nt really work as internal stresses are sometimes great enough to pull the parts off the base )
     
    4. Put pauses on each slice to allow heat to dissipate ( I haven't tried this yet but it kinda goes against the grain to deliberately build parts more slowly! )
    
    Is there a better way of building these parts? or am I missing something? all assistance as usual gratefully recieved.
    
    Question 2.
    T10 Tips on the Stratasys FDM 2000
     I am interested to hear of other users experiences using T10 Tips, do you get a noticeable improvement in part finish? are there any problems using the T10 tips? does it extend the envelope of the small parts you can build? Anyone tried it on a 1650?
    
    Question 3.
    Waterworks Support structure: I was asked by a colleague if it was possible to Investment Cast parts ( burning out the ABS master) built using the waterworks support system, I think he was interested to see if the finish was good enough to cast enclosed areas without any hand finishing. Anyone tried it?How reliable is Waterworks?what about inclusions/porosity?
    
    
    Thanks in advance, all information gratefully recieved.
    
    
    Oliver Cole
    Technical Director
    RP Solutions
    
    Tel: 02476 632 120
    
    Fax: 02476 632 131
    
    
    
    
    
    
      

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