SeeMeCNC
Release status: working
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Contents
Introduction
The SeeMeCNC H-1 design is based on the reprap Huxley. It is the first reprap style 3D printer to use injection molded plastic parts.
Our original goals were to produce as many parts as possible with injection molded parts, effectively lowering the price into DIY 3D printing, and turn to more conventional CNC technology, making it easier for newcomers to 3D printing and CNC machines. The H-1 is designed for standard SAE hardware. This includes the use of 1/4-20 threaded rods for the frame and Z axis lead-screws, 5-40 nuts/bolts for small sub assemblies, 10-32 nuts/bolts for others, and timing belts/pulleys designed around English units.
H-1 Assembly Diagrams
Please help contribute to the community by adding your own notes to the below User Generated Build Notes Page.
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.
High Temp Silicone for installing thermistor/resistors is a great way to make those parts easily replaceable if ever you need to. Permatex Ultra Copper works best, as it's suited for 700F temps. It remains flexible and can easily be scraped off and re-applied if needed, and it's non-conductive.
Dimensions
Approximate Build envelope is 6" X 7" X 6" Overall Machine Dimensions are appx. 18" X 18" X 12" Weight of machine with extruder and all motors installed (not counting any electronics) is around 10 lbs.
Injection Molded Parts
SeeMeCNC.com makes our own tooling and injection molds our own parts, through Partdaddy.com
See below for all the .stl files of all the parts
Printed parts
At this time, no one is printing parts for the H-1. Some have printed replacements/repairs as needed, using the below .STL files
Electronics
SeeMeCNC is using Mach3 desktop CNC software for their machine control. Others have successfully used EMC2 on linux, as well as more traditional RepRap electronics, such as Gen6, sanguinolulu etc...
Do not buy their electronics package if you want to run an Arduino based setup. They offer different packs of parts, hardware and even motors for the Arduino builders.
Note on the Velleman MK138 temp control board. If you are wanting to print in ABS, you will need to replace R5 on the board with a 10K-20K Ohm resistor to get up to 480+ F. The kit ships with a 120K Ohm for R5, but that will only allow up to around 400 F temps.
Software
We (SeeMeCNC) are using modified versions of ReplicatorG and Skeinforge to generate g-code for Mach3 and similar CNC control softwares. Although, our machines are just the hardware, so you are free to use whatever too-lchain you like.
Our approach is as follows.
1. Generate .stl file using your favorite CAD software 2. Open .stl file in our modified replicatorG. Use it to view size, scale, position etc... 3. Use skeinforge for toolpath generation/slicing 4. Load Gcode file into Mach3 CNC control software
Steppers
H-1 machines use standard NEMA 11 through NEMA17 stepper motors. You need 4 motors total, 1 for each X, Y and Z axis, and 1 for the extruder.
NEMA17 steppers (4) provided in the kits are 4-wire 66.6 oz-in Wantai 42GYBH811, see specs at: http://www.electronicaestudio.com/docs/PH3303.pdf
Extruder
"Steve's Extruder", a gear-driven, dual-driven pinch feed roller design. It uses NEMA 11 through NEMA 17 stepper motors. The hot-end uses two 6.8 Ohm 3 watt wire-wound resistors, and 4K ohm @ 200C 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. The thermistor used in the hot end is a part number 657-GC1396V-3-200 from Mouser Electronics and can be found here: Mouser Electronics and the data sheet can be found here: Data Sheet. The wire wound resisters used to heat the hot end up are RWMA-6.8CT-ND from DigiKey.
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 axes 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
In total, you need 6 R4ZZ ball bearings for the machine. IF you want to use ball bearings instead of themolded acetal rollers on the linear axis smooth rods, you will need 32 R2ZZ bearings to replace the acetal rollers.
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 2.5mm for NEMA 11, or 3mm x .5 mm for NEMA 17
NOTE on threaded rods, they are now shipped PRE-BENT as of 1/15/2012
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.
.STL Files
Ongoing development
Yahoo Groups page, compliments of Andy
