Show all posts by user
Page 4 of 4
Pages: 1234
Results 91 — 119 of 119
The listing says 6N137 optocouplers.
These are fast couplers.
by
george4657
-
Controllers
Cocoknight
can you paste a few lines of gcode with arc so I can test on my system.
In normal cnc zero is the top of the work and moving down is going negative which is the opposite of 3d printers
CRDU
If you look in Marlin code for Marlin_Main.cpp you will see the line "This firmware is a mashup between Sprinter and grbl."
GRBL is a cnc program that supports arc comands.
I have tried G2 And G
by
george4657
-
Mendel90
Marlin supports arc gcodes G2 and G3
The problem is STLs are all straight lines so slicers do not have the logic to convert to circles or arcs.
The following three lines generate cause my printer to run in a circle.
G1 X0 Y90 F200000
G3 X180 Y90 I90 J0
G3 X0 Y90 I-90 J0
G1 X0 Y90 F200000 = move to edge of area 180 x 180 at maximum printer speed
F200000 is s
by
george4657
-
General
If the m880a enable pin is not connected the driver will be enabled all the time. If you want to enable via software you need to connect it to the enable pin.
The a4988 shorts the sleep and reset pins. The M880A does not have these pins.
by
george4657
-
Stepper Motors, Servo Motors, DC Motors
To use external drives you just connect ground, direction and step pins from board to driver. You then connect power supply + and ground and steppers to extrernal driver.
Do not install a4988 drivers.
I just looked up the motor. These are huge motors, I can not imagine a 3d printer ever needing this big a motor. They are 5 times larger than my cnc machine used to mill metal.
by
george4657
-
Stepper Motors, Servo Motors, DC Motors
If I was building a printer board I would use a DRV8825 driver chip. The problem is the fine pitch of the pins would be a problem for my bad eys and board building skils.
The other problem is cost, purchasing all parts required in small volume would cost more than an assembled driver board.
If you are doing it as a learning experience not a cost savings design a board using the Pololu driver boar
by
george4657
-
Controllers
I am not sure what you are looking for. The L 297 is a controller to drive a chip such as the L298 to drive a stepper.
Are you looking for a chip to control an L298 or are you looking for a stepper driver chip.
To drive a L298 with multi steps most people use a small microcontroller.
To drive a stepper with a single chip there are several available but It depends on what power/voltage level you n
by
george4657
-
Controllers
QuoteWell it is three times longer so I would expect three times the machine time.
Commercial extruders don't run at a maximum speed, they are more volume controlled. A small part extrudes faster than a large part. At least thats my experience with pvc extruders.
by
george4657
-
Reprappers
The first 3 pins set the steps the same as the A4988 except 3 pins set the DVR8825 at 32 microsteps where the A4988 is 16 steps.
The 4th pin for the DVR8825 goes to the sleep and reset pins and is not needed on the new drivers. Unless you got these drivers a long time ago the should be the new ones.
If you want go to and look at the pictures of the 2 different drives. It looks like there is a ch
by
george4657
-
Controllers
Steppers work on magnetic force from coils of wire. If you feed 3.6 volts at 2.4 amps to the motor it would have full holding power.
To step the motor you reverse the direction of current in the coils. At 3.6 volts this would take a long time so motor would be very slow.
By using a higher voltage the current can be changed quicker and the motor can run much faster. The higher the voltage the fast
by
george4657
-
General
Has eagle files
Manual pdf has schematic also
by
george4657
-
General
24 volts at 2.43 amps looks wrong.
See this link
5718M 4 wire motors are 173 oz-in
5718M-05P is 2.8 amps at 0.9 ohm = 2.5 volts (i*v) or 7 watts (i*i*r)
5718M-02S is 2.1 amps at 1.8 ohm = 3.8 volts or 8 watts
24V * 2.43amps = 9.8 ohm or 58 watts
Measure the resistance of the coils
George
by
george4657
-
General
Try commenting out line
#define PREVENT_DANGEROUS_EXTRUDE
in configuration.h
by
george4657
-
General Mendel Topics
Extruder will not run if hotend is not above a minimum temperature.
To test with no filament in extruder send command M302 which is "Allow cold extrudes"
Then try to extrude. Motor should now move.
by
george4657
-
Reprappers
Go to and enter part number
It will list several suppliers of this chip
by
george4657
-
Controllers
I use a 1.5.7 board which is an Ultimake clone. There are two problems with this board.
1. The power supply connection is not designed for a heated bed. I route my heated bed to an external Fet switch.
2. It is not as common as the ramps boards so you have to know what you ar doing re setting up pins and plugging in drivers.. Most people will answer a question assuming you are running ramps 1.4.
by
george4657
-
Reprappers
I had this problem and I looked at it to find the problem.
The problem was that when I finished a print I released the filament and it unwound a layer on the spool.
So when I started a new print I pulled out the end and often it was under an other coil so it would jamb up after a few turns.
I solved this by pulling out a long length and if it was under an other coil i would pull it out from under
by
george4657
-
General Mendel Topics
Send command M119 to the printer.
It will send back state of the end switches.
If it shows Z as triggered then you need to correct your end stop.
If you are using mechanical switches you can change pin on switch( No to NC or NC to NO).
Or you can change setting in config.h
const bool Z_MIN_ENDSTOP_INVERTING = false; // if false set to true , if true set to false to invert the logic of the en
by
george4657
-
General Mendel Topics
The G28 command comes from your slicer software.
In slic3r it is under Printer Settings -> Custom G-code -> Start G-code
Mine is:
G28 ; home all axes
G1 Z3 F5000 ; lift nozzle
Just change it to the startup code that you want
by
george4657
-
Firmware - mainstream and related support
steps set with this line:
#define XYZ_STEPS (XYZ_FULL_STEPS_PER_ROTATION * XYZ_MICROSTEPS / double(XYZ_BELT_PITCH) / double(XYZ_PULLEY_TEETH))
from defines
XYZ_FULL_STEPS_PER_ROTATION = 200
XYZ_MICROSTEPS = 16
XYZ_BELT_PITCH = 2
XYZ_PULLEY_TEETH = 16
so XYZ_STEPS = (200*16/2/16) = 100
Y 60/60.6 * 100 = 99.01
X 60/60.9 * 100 = 99.52
#define DEFAULT_AXIS_STEPS_PER_UNIT {XYZ_STEPS, XYZ_STEP
by
george4657
-
Firmware - mainstream and related support
You need to decide on the stepper driver you purchase prior to building a power supply.
For maximum speed you would need a 65 volt supply due to the high inductance of that motor.
Drivers rated that high are expensive and probly not needed.
You can get reasonable drivers rated at 50 volts which will give good speeds but allways run lower than stated maximum.
If speed is not a factor you can run a
by
george4657
-
Stepper Motors, Servo Motors, DC Motors
Don't know about mcode but is set in configuration.h file
#define BED_MAXTEMP 150
by
george4657
-
General
Thats the way I did it prior to having working printer.
Copied from printerbot wooden printer
by
george4657
-
Reprappers
My drivers pins are 0.5 inches across. Eagle files for the StepStick show the same
I don't think this is a standard socket size.
I would use two 8 pin 0.1 inch spacing headers spaced 0.5 inches apart
by
george4657
-
Developers
cdru:
Circumference = pi * dia or radius *2 * pi so your values are 1/2 proper values.
At 16 microstepping = 93 steps per mm which is close to the 105 in config file depending on actual dia.
At no microstepping = 5.8 steps per mm which is close to the 6.3 value
Stephanel:
In addition to cdru's good advice.
Make sure your hot end is up to temp and extrude at slow speed to test. (50mm / min)
If
by
george4657
-
RAMPS Electronics
Your homing speed may be too high.
Check
#define HOMING_FEEDRATE {50*60, 50*60, 3*60, 0} // set the homing speeds (mm/min)
In
Configuration.h
by
george4657
-
RAMPS Electronics
Check on ebay, you should be able to find repaceent for the soldering iron only for a very low cost.
by
george4657
-
Controllers
SPD-SI has cad files for their parts.
#
by
george4657
-
Mechanics
Page 4 of 4
Pages: 1234