Fab Academy at AS220 - Machine / Mechanical Design unit for 2012. We are currently working on an Ultimaker clone.

Contents:

• Open Items: Questions and Issues
• Closed / Answered Items
• Parts Ordering Status
  • Extruder Parts / Stepper Drivers
  • Mechanical Parts
  • Electronics Parts
• Case / Enclosure
• Electronics Options
  • Option 1: Ultimaker PCB
  • Option 2: Gen 7 Electronics
• Mechanical BOM
  • Extruder
  • Motors
  • All Other Mechanical Parts

Open Items: Questions and Issues

• Need:
  • Blue 3M painters tape
  • Acrylic for build platform
  • Need hobbled bolt. http://wiki.ultimaker.com/Ultimaker_rev.3_assembly:_Material_feed_mechanism
  • delrin tensoining plate
  • fan housing
  • belt tighening: measure with a string, around the pullies, cut taught string and measure the pitch.
    

Closed / Answered Items

• Ted to get push to connect fittings. May need to come up with something else.
  • STATUS: Closed
    
    
• Do we have the 8mm and 6mm rods or do we need to order?
  • STATUS: Closed
    
• Extruder Items Needed:
  • 1 push in fitting - Tiny small plastic tube (TED) done - may need to modify
  • 1 horse shoe - Tiny blue U-shaped plastic that will stick later on the fitting (TED) - test as we go
  • 1 aluminum plate - with four holes (TED)
  • Plumbing Tape - we need a little piece. (JOSH)
  • 4 m3 studding - long bolts, +- 95mm with a black top part (TED)
  • STATUS: Closed
    
    
• Which Board House do we want to use?
  • BW recommends  http://www.goldphoenixpcb.com/
  • STATUS: Closed - Ordered 7 boards from Gold Phoenix - Bruce would like 5.
    
    
• Ordering the Nema 17s  (we need 4)
  
  • We need to make sure they are correct torque size i believe around 40gm-cm to little and you need to supply more current to the stepper causing the stepper to heat up, to high torque and the stepper driver will heat up. (JH) 
  • Bruce recommended these motors - Scott confirmed torque sufficient.: http://www.ebay.com/itm/NEW-Nema17-Stepper-Motor-7-5-ohm-0-8-Amp-1-8-Deg-3400g-cm-CNC-Reprap-Arduino-/180790704516?pt=LH_DefaultDomain_0&hash=item2a17f73984#ht_720wt_1396
  • STATUS: Closed - Motors ordered
    
    
• What case design do we want to use Lasercut wood / HDPE?
  
  • JOHN - please add your ideas, designs, negotiations with Pawtucket Laser to the "Case / Enclosure" section below.
  • If the size of case is changing then the affected parts need to be changed to different sizes.
  • STATUS: Closed: John cut case
    
    
• Bruce Says (via email with Anna) we should also get the brass 4 X, Y axis brass bushings, extruder drive bolt.  
  
  • BRUCE: Do we order these from Ultimaker?  I can't seem to find them on the site.  
    
  • I found this link, but dont know where to buy: http://wiki.ultimaker.com/Bearing_Pack_version_1_updated
  • STATUS: Closed: Scott / Josh found replacement parts, parts ordered
    
    
• Do we have to fab the Arduino shield or can we use a board house?
  
  • This determines the Electronics BOM and what electronics version we use, see Electronics section below.
  • Neil says: We need to show "mastery" of the unit, we do not need to fabricate all of the electronics.
  • STATUS: Closed - We will use the Ultimaker PCB and get it made at a board house.
    
    
• Do any adjustments need to be made to Bruce's mechanical BOM?  We need to order the mechanical parts.
  
  • JOSH / SCOTT can you confirm that this part list is what we need.  
    
  • Did you make any adjustments to the design that require different size rods or parts?
  • For parts without part numbers or suppliers - can someone assess what we need?
    
  • Please review the Mechanical BOM (under Parts Ordering Status) and confirm that these are the parts we need.
  • STATUS: Closed - changes made to Parts Ordering Status BOM below .

  Parts Ordering Status: