Delta 3D Printer
|Delta 3D Printer|
|Project Owner: Open|
|Project Location: FabLab|
|Where to contribute: Need to complete the design and print 3D parts.|
|Start Date: 01/31/2018|
|End Date: MM/DD/YYYY|
Build a Delta 3D printer for the Hive.
Create a Delta 3D printer from some existing parts and 3D print the remaining parts.
Observation: The current inventory of arm rods, base plates, hot ends and motors are part of defining the printer geometry. Further design definition is required to document hot end dimensions including center of gravity and mounting in effector. This will constrain minimum effector dimensions. Selection of arm end attachment to effector and carriage (rod ends or magnet-ball) will further constrain the effector design. Using these constraints the effector geometry can be designed to maximize effector stability as defined in the excellent RepRap Delta_Geometry article.
The effector design, defines the arm spacing which is required to define the carriage. Once the column spacing, effector, arms and carriage are roughed out in dimensions the print envelope can be calculated.
We are going through the existing parts (motors, carbon tubes, boards, build plates).
Got approval from the Hive for $250 to spend on parts and stuff.
Inventory of Stuff We Have:
Bar, carbon fiber tube OD 11.93 mm, ID 9.98 mm
· Qty 46 183 mm long
· Qty 28 750 mm long
Arm, carbon fiber tube OD 5.83 mm, ID 3.62 mm
· Qty 30 226 to 229 mm long
· Qty 6 Same arm with rod end attached
Rod End – Alignment range measured at +/- 37 degrees
· Qty 60 approximate ( may be missing bearing inserts ) Pressed one together, it works.
Hot End assembly Some with, some without fans – General physical dimensions
Build Plate – 262 mm across minor axis 305 mm across major axis
|Item Description||Cost (each)||Quantity||Cost||Remain|
- Finalize design of 3D printed parts (corner blocks, carriage/trolly, hot end holder, arms)
- File:Rostock Delta Kinematics by Steve Graves (Johann C. Rochel (Rostock) Style ).pdfReference - Delta Robot Kinematics by Steve Graves (Johann C. Rochel (Rostock) Style) 
Reference - Deepak Kandepet - Marlin 3D printer firmware: Delta inverse kinematics 
- Print the pieces we can
- Figure out what we need to buy
February 11, 2018
Dave wrote a spreadsheet for generalized Linear Delta Printer inverse kinematics using the naming conventions used by Steve Graves with aid from analysis by Deepak Kandepet. The spreadsheet allows for input of printer physical parameters, x, y, z hot end positions and displays resulting carriage positions, arm angles and motor step pixelated motion at the hot end. Link to download .xls file from Google Drive 
January 30, 2018
Brad, James and Dave got together and decided on a triangle frame and two vertical rods per corner.
- RepRap – Delta Geometry