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Safety...
Are the design requirements:
Not to be based on any proven design
Use only hardware that is handy
Print should not be visible when printing (hole cut in plywood - would not make it much more flimsy)
Bed leveling next to impossible
Do not use bolts or screws of the proper length?
Do not cut bolts / screws to proper length?
Do not use lock washers or stop nuts
Drywall screw thru plywood not
by
cozmicray
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CoreXY Machines
A web search for "mold design software" may be helpful
Mold making in Sketchup
Choosing CAD Software For 3D Mold Design
ZW3D, ALL-IN-ONE, AFFORDABLE CAD/CAM
by
cozmicray
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3D Design tools
I don't understand two steppers on the bottom?
Two motors to drive 3 Z leadscrews?
Z motion three leadscrews and three guide rods --- over constraint?
Plastic parts shouldn't make up for over constraint.
Why linear rail and rod mix?
by
cozmicray
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CoreXY Machines
It's about time to put real topics on these posts
"My coreXY design is progressing to the build stage" probably has run long enough?
Last few posts "cooling pump" not specific "core XY"
FWIW
Could be "the Digital Dentist sez"
by
cozmicray
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CoreXY Machines
Take a look at the Helios
by
cozmicray
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Reprappers
The planer only cuts the tiny amount that the blades stick out.
on some planners this is adjustable
--- many fixed at 1/8 " or tuned to the power of the motor and drive system
Leadscrews allow you to plop head down on wood and take the 1/8" cut that blade sticks out
and keep the feeder rollers (if it has them) in contact with wood
NOT a good example for 3D printing
by
cozmicray
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CoreXY Machines
Students suppose to do research
search the web for "CNC with Marlin software"
What budget? $10,000? $100,000
RAMPS is just hat atop arduino running firmware
turning g-code to motor movements
Do you need cnc to do your project
or
Is the project to build CNC for 1m x 1m polymers?
RAMPS wiki may be useful
RAMPS mainly 3D printer controller
What research / requirements drive use of RAM
by
cozmicray
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CNC Routers, Mills, and Hybrid RepRapping
What do you want to engrave?
Glass --- tough -- need high power and the right frequencies
see
J Tech Photonics, Inc. designs and develops high power diode lasers solutions for research, industrial, and enthusiast applications.
Shapeoko laser forum
by
cozmicray
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General
Are the X axis guide rods rotating?
Interesting to use rod as guide and drive?
by
cozmicray
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Reprappers
Ramps or smart Ramps
has only 5 motor drivers Two less than you require
A Duet with DueX4 expansion board would get you 8 motor drivers
Do you want to build a printer
or
spend all your time modifying controller electronics?
Take all your requirements and bounce them against what electronics and firmware that is available
or
spend $100,000 developing a one of a kind mohala board
by
cozmicray
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Controllers
Linear rails
appear to be Igus DryLin N series
That is just a polymer trolley in a c shape aluminum.
No strength at all in these tracks and are meant to be tied down to structure.
A far cry from Hiwin rails with steel tracks and bearing trolleys
Would be neat to know how the hold up? Flexing and trolley wear?
Digital dentist
What is your take on these linear rails?
I khow you are proponent of
by
cozmicray
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Extruded Aluminum Frames
You should look at multi start or High helix leadscrew
to get speed out of a lead screw
multi-start lead screw product provides high linear nut speeds
from low rotational screw speeds
by
cozmicray
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Mechanics
So that 10 hour print will grind away in your cupboard
with the noise driving all crazy?
by
cozmicray
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General
Big difference in diode laser
to
CO2 laser
Diode laser can be moved around on print head
CO2 laser tube fixed and optical system points the cut point.
Many passes to cut things with 2 -3W laser
by
cozmicray
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Laser Cutter Working Group
The slicer needs to know the printer to gen the code
A 3D printed circle is a bunch of segments
designated in the CAD program
Printer independent language
Some CAD / CNC can define arc -- center point, radius, degree of arc
Thus printing at resolution of printer
GRBL commands
Arc IJK Distance Modes: G91.1
QuoteWesBrooks
Quotecozmicray
the 3D printing world needs a type of language to move
by
cozmicray
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General
Video of 1.75 W 455nm laser
on Shapeoko 2 (arduino - GRBL)
I think it was 12 passes to get thru corrugated cardboard
Cutting takes lots of power and focused laser
by
cozmicray
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Laser Cutter Working Group
The progression in ink printing was
dot-matrix
Ink-jet
Laser
and greater and greater resolution
Printing at the resolution of the printer not the display device
Postscript was developed to provide the language for this.
(first device-independent Page Description Language (PDL),)
the 3D printing world needs a type of language to move forward
by
cozmicray
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General
Economics
What is cheaply available Now
What is vaporware?
by
cozmicray
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General
I was given a simple 1.5w laser engraver for Christmas. I won't tell you what brand it is or include any pictures so it is easy for you to reply.It's great fun but it has some obvious drawbacks. I'd be quite interested to strap the laser into a proper machine.Like a cooper mini! or Haas CNC machine I could take the electronics from my current engraver, but without much knowledge of what it is, th
by
cozmicray
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Laser Cutter Working Group
An induction heating electronics is not that simple, and expensive.
Extruder and hot end are a high pressure pump.
Taking polymer from solid, to plastic, to liquid
and then pressed out a small nozzle
The heating zone has to be a specific size
to provide a melt zone and pressed out with solid
filament as a piston.
What is the deal with making it more efficient
?Battery powered printer?
Takes a
by
cozmicray
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General
PWM laser action
Engraving of calibration scale by PWM 1.75W laser
PWM input to laser TTL trigger,
wider (longer) the pulse width the more power, more burning
This is a raster scan of calibration scale
by
cozmicray
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Laser Cutter Working Group
Switching a Laser diode power ON/OFF is rough on diode
Using PWM on trigger circuit much better
You may be able to gin up a circuit to trigger your laser
I showed you shapeoko laser area which has a lot on
lasers mounted instead of spindle
Shapeoko use GRBL board on Arduino
so PWM out of pin 12 may be used to control laser
since RAMPS is on arduino so you can use a pin
on arduino to PWM the la
by
cozmicray
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Laser Cutter Working Group
Why did you buy this laser?
When people advised to get a laser
with a separate driver / supply with TTL control.
Sort of like --- read, watch youtube and ignore it all
This forum may help a lot --- sorry you may have to
do some searches / reading
J-Photonics
expensive but very good, safe, well documented lasers
documents are free for the reading
Please safety - protect your eyes
by
cozmicray
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Laser Cutter Working Group
Do yourself a favor
ditch the rods
use linear rails
see the digital dentist build
by
cozmicray
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CoreXY Machines
Done in 2012 by TrinityOne
100 orphan printers out there
Aluminatus TrinityOne 3D printer
using 10 start 25mm pitch leadscrews) SIMO™ linear actuators
you may want to try high start leadscrew?
by
cozmicray
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Look what I made!
All axes have at least two guide rods
except the longest -- Y axis WHY?
5/16" sag in glass base? not good? SW compensation
support glass in center?
Perhaps an aluminum plate? less sag?
What are the advantages of this design?
by
cozmicray
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Reprappers
Laser cuts with heat.
How much will the latex shrivel with heat
along cut line
latex can melt anywhere from 250 F to 350F
latex sheeting does vent toxic fumes on vaporization, and leaves some messy residue behind after cutting.
You may want to ask some to shoot laser at latex
see if it cuts, melts, shinks up
I would suppose high power laser to cut quickly (expensive)
by
cozmicray
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Laser Cutter Working Group
Turtle blower
Patient respiration -- important --- blower plus driver electronics
Has to be very quiet, and secondly it has to respond dynamically and positively to the patient’s respiration requirements.
Its air flow and pressure must be continually adapted to the patient’s own breathing. The blower drive must therefore be able to adjust its speed with extreme flexibility. The development en
by
cozmicray
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CoreXY Machines
Keeping the motor ON all the time
the motor will heat up and get very HOT.
Use a motor brake or mechanism to hold axis.
A worn drive or counter-balance could work
by
cozmicray
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Stepper Motors, Servo Motors, DC Motors