SeeMeCNC
Release status: working
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Contents
Introduction
The SeeMeCNC H-1 design is based on the Huxley. It is the first low cost 3D printer to use injection molded plastic parts. Original goals were to produce as many parts as possible with injection molded parts, lower the price-point into 3D printing and turn to more conventional CNC technology, making it easier for newcomers to 3D printing and CNC machines alike more familiar.
Notable difference in the H-1 is that it's designed for standard SAE hardware. All of this is supposed to make the sourcing of parts and building components easier in the U.S.A.
H-1 Build Instructions
All of these PDF's are built from the Solidworks Model, which all the injection mold tools were built from
File:71590 Steves Extruder Assembly.pdf
File:71584 Y Axis and Z Axis Assembl.pdf
File:71576 Z Axis Carriage Assembly.pdf
File:71574 Extruder Barrel Assembly.pdf
File:71579 Triple Bearing Sub Assembly.pdf
File:71578 Sub Assembly Double Bearing.pdf
File:71577 Combo Bearing Sub Assembly.pdf
File:71582 Z Axis Base Sub Assembly.pdf
File:71581 Rear Base Sub Assembly.pdf
File:H-1 Assembly Diagrams Complete.zip All of the assembly pdf's zipped up for download.
File:71580 Front Base Sub-Assembly.pdf
File:71523 Offset Support Rod Template SeeMeCNC.pdf
Build Notes
User generated SeeMeCNC-H1 Build Notes offer tips and advice you may find useful during your build
Supplies
All of the hardware should be readily available at local hardware stores. The plastic parts can be purchased from SeeMeCNC.com or from someone who has printed the parts from the CAD files.
Some parts, like the PTFE tubing and electronics, have come from sources other than local stores.
(soon to be uploaded)
Dimensions
Approximate Build envelope is 6" X 7" X 5". Z area varies slightly with bent rod length of bends
Injection Molded Parts
SeeMeCNC.com makes their own tooling and injection molds their own parts, through their company Partdaddy.com
Printed parts
Need sources for printed parts
Electronics
SeeMeCNC is using mach3/EMC2 configurations on their prototype machines. Any other type controller electronics could work, such as arduino, sanguinolulu, ultimaker RAMPS etc...
Do not buy their electronics if you want to run an arduino based setup, just buy their hardware.
Note from John's testing on 12/27/11-when building the Ramsey(Velleman MK138) Temp Control Kit, replace R5 with an 18K resistor. This will allow the temp control to work up to about 480 degrees.
Software
SeeMeCNC is using modified versions of ReplicatorG and Skeinforge to generate g-code for Mach3 and similar CNC control softwares
Steppers
Standard NEMA 11 OR NEMA17 steppers.
NEMA17 steppers (4) provided in the kits are 66.6 oz-in Wantai 42GYBH811, see specs at: http://www.electronicaestudio.com/docs/PH3303.pdf
Extruder
Uses "Steve's Extruder", a gear-driven, dual driven pinch feed roller design. It uses either a NEMA 11 or NEMA 17 stepper motor. The hot-end uses two 6.8 Ohm resistors, and a 100K ohm thermistor for temperature control. The gear driven unit has a gear reduction ratio of appx. 6.5:1.
For Reference: If you put the (2) 6.8 ohm resistors in series, and run them at 24VDC, you will get the same power (42W) as using them in parallel at 12VDC.
Timing belt
Timing Belts are XL, in 1/4" width.
X = 25-3/4" length, secured to rear of extruder carriage bearing blocks
Y = 41" length, secured to bottom of table
Z = 310XL closed loop (31" length)
Bearings
The linear axis rollers use (stock) (32) Plastic Acetal molded bearings, or (custom) (32) R2ZZ (1/8ID x 3/8OD x .156W) ball bearings.
"Steve's Extruder" Uses (4) R4ZZ? 5/8" x 1/4" bearings
Z axis support plates use (2) R4ZZ? 5/8" X 1/4" bearings
Nuts and bolts
All hardware is standard inch units. 1/4-20 Threaded Rod 1/4 Drill Rod (for linear rod) 5-40 nuts/bolts for sub assembly of linear bearing plates The only hardware that is not a standard SAE size is the bolts for the steppers, which are 2.5 or 3 x .5 mm
To bend the 4 threaded rods(thanks, Yoyo): 1) Draw two lines on legal paper 3" apart. 2) Draw a 8.5" line connecting them 3) Take 9 nuts and screw them to the bottom of the threaded rod, all nuts abut each other and the last nut is flush with the end. 4) Take the 7/16" spanner, the same one you use for the other nuts and slide it about 1/4" above the top most nut. 5) Apply elbow grease and bend the rod until the angle matches that of the paper guide. 6) Repeat until done.
Ongoing development
Yahoo Groups page, compliments of Andy