Posts made by chanders

@macnite said in Tool Changer and the wiring Issue:

Hey guys,

I recently built a CoreXY printer with a built volume of 500x500x500mm. You can find information about the project here:
CoreBot

How is this different from a Hypercube Evo? Just curious..

@alexlin said in [Precision Piezo] Compensation for bending rods while probing:

@chanders i think it is sag..I have a corexy hevo and had the same problem..used X/Y axis mount where the x-rod is hold at 2 places on each side which makes it a bit stiffer...
Do you have a direct extruder, i.e. more weight than a bowden?

My CoreXY is also a HEVO. Its a bowden setup so not so much weight on the rods, even though the cables may be adding some weight to the gantry.

Do you have any links to this mount you referenced?

@alexlin said in [Precision Piezo] Compensation for bending rods while probing:

the force at which the piezo is triggered is very small. surely not enough to bend your rods .4mm. And still it would cause a dip..have you tried with a lower probe speed?
Also the bulge is larger in the center than it is on the sides. Is this corexy? Then the center is the accumulation of sag in x and y axis. Whilst on the edges in the middle it is only

It is a CoreXY with >400mm 8mm rods so it may be sag?

I did try a lower probing speed but that just required more force (and bending of the rods) to trigger the piezo.

@dc42 said in [Precision Piezo] Compensation for bending rods while probing:

I think what you mean is that the force between the nozzle and the bed while probing causes the rods supporting the nozzle and/or the bed to bend, and that bending delays triggering. But surely that would cause the height map to have a dip in it, not a bulge?

That’s exactly what I was trying to say. Thanks.

I guess you are right as it would show up as a dip wouldn’t it.. I’ll have to do a little more investigating

@dc42 said in [Precision Piezo] Compensation for bending rods while probing:

That's exactly the sort of thing that G29 is for. Although it's usually called bed compensation, it's frequently used to compensate for sag in the gantry too. The firmware doesn't know whether the bed is bulging or the gantry sagging, the effect and the compensation needed are the same. But if you are sure the bed is flat and the gantry is sagging, don't use bed compensation taper!

The difference here is one is touching the bed while probing causing the bowing of the rods. When the printer is printing, the nozzle isn't touching the bed so the rods are straight. Wont this be different from when the data was captured when the rod was bending?

I believe this is different from sag when the rods bend under the weight of the carriage and not being bent while probing.

Is there a way to compensate for the bending of the rods while probing at the center of the bed (Rod length is 480mm)? This is with very high sensitivity and a fast probing speed (to ensure it picks up the point on the piezo disk)

EDIT: Am positive the build plate is flat and does not have a belly in it. Difference from outer edge to center in Z is 0.15mm after probing (from mesh).

@phaedrux

I believe you are right. Disabling mesh does not change the Z value.

Thanks!

@phaedrux

Yes I am

@phaedrux

https://www.dropbox.com/s/ofst2emogxmefwp/Video Jan 05%2C 6 59 16 PM.mp4?dl=0

@phaedrux

Forum says I'm a newbie so I have to wait one minute before posts

@phaedrux

; homez.g
; called to home the Z axis
;

; Drop the bed for travel
;
G91 ; Relative positioning
G1 Z10 F200 S2 ; Lower bed 5mm to ensure it is below the switch trigger height

; Move probe into position
;
M98 homex.g
M98 homey.g

G90 ; absolute positioning
G1 X145 Y145 F4000 ; Move x and Y axis over to bed center so probe is on top of bed

; Set lower speeds for homing
M566 Z5 ; Set maximum instantaneous speed changes (mm/min) (Jerk)
M203 Z400 ; Set maximum speeds (mm/min)
M201 Z100 ; Set maximum accelerations (mm/s^2)

; Probe the bed
;
M558 A1 F350 ; Set single probing at faster feed rate
G30 ; Do a single probe to home our Z axis

; Set normal speeds again
M566 Z12 ; Set maximum instantaneous speed changes (mm/min) (Jerk)
M203 Z300 ; Set maximum speeds (mm/min)
M201 Z300 ; Set maximum accelerations (mm/s^2)

@phaedrux

; homex.g
; called to home the X axis
;

M400 ; make sure everything has stopped before we make changes
M913 X60 ; reduce motor current to 50% to prevent belts slipping unfiltered
M915 P0:1 S3 R0 F0

G91 ; use relative positioning
G1 S1 X-325 F3000 ; move to home position
G1 X25 F2000 ; back off to edge of bed

G90 ; back to absolute positioning
M400
M913 X100 Y100 ; motor currents back to normal

; Configuration file for Duet WiFi (firmware version 1.20 or newer)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool on Sun Mar 11 2018 10:55:11 GMT-0400 (AST)

; General preferences
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves

M667 S1 ; Select CoreXY mode

; Network
M550 PHypercube Evolution ; Set machine name
M552 S1 ; Enable network
M587 S"HomeWiFi" P"xxxxxx" I192.168.0.132 J192.168.1.254 K255.255.255.0 ; Configure access point and IP addresses. You can delete this line once connected
M586 P0 S1 ; Enable HTTP
M586 P1 S0 ; Disable FTP
M586 P2 S0 ; Disable Telnet

; Drives
M569 P0 S1 ; Drive 0 goes forwards
M569 P1 S1 ; Drive 1 goes forwards
M569 P2 S1 ; Drive 2 goes forwards
M569 P3 S0 ; Drive 3 goes backwards
M569 P4 S0 ; Drive 4 goes backwards
;M584 X0 Y1 Z2 E4 ; Apply custom drive mapping
M350 X16 Y16 Z16 E16:16 I1 ; Configure microstepping with interpolation
M92 X80 Y80 Z800 E418:418 ; Set steps per mm
M566 X600 Y600 Z20 E120:120 ; Set maximum instantaneous speed changes (mm/min)
M203 X6000 Y6000 Z300 E1200:1200 ; Set maximum speeds (mm/min)
M201 X500 Y500 Z300 E250:250 ; Set accelerations (mm/s^2)
M906 X600 Y600 Z600 E800:800 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout
;M572 D0 S0.5 ; Pressure advance for Extruder0
;M572 D1 S0.5 ; Pressure advance for Extruder1

; Axis Limits
M208 X0 Y0 Z0 S1 ; Set axis minima
M208 X265 Y285 Z270 S0 ; Set axis maxima

; Endstops
M574 X1 Y1 S3 ; set endstops to use motor stall

; Z-Probe
M574 Z1 ; Set endstops controlled by probe
M558 P7 H5 F120 T6000 ; Set Z probe type to switch, and the dive height, speeds
G31 P500 X0 Y0 Z-0.1 ; offset and trigger height
M557 X25:265 Y5:285 S80 ; Define mesh grid
M376 H10 ; Fade distance

; Heaters
M304 P377.6 I11.413 D531.8
M305 P0 T100000 B3950 R4700 H1 L0
M143 H0 S120 ; Set temperature limit for heater 0 to 120C
M301 H2 P12.6 I0.584 D35.7
M305 P2 T100000 B3950 R4700 H1 L0 ; Set thermistor + ADC parameters for heater 1
M143 H2 S280 ; Set temperature limit for heater 1 to 280C

; Fans
M106 P0 S0 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P1 S1 I0 F500 H1 T45 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
M106 P2 S1 I0 F500 H1 T45 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned on

; Tools
M563 P0 D1 H2 ; Define tool 0
G10 P0 X0 Y0 Z0 ; Set tool 0 axis offsets
G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C

; Automatic saving after power loss is not enabled
; Custom settings are not configured
; Miscellaneous
T0 ; Select first tool

Hi guys, I have a peculiar issue. Homing one axis changes the position of the other axis. Example when I home the Y axis (which goes to Y=0), the position for the Z in the DWC changes (if it was 0.3 it may jump to 0.41 etc.)

What can be causing this? I am using a Precision Piezo with nozzle as probe.

Here is my firmware version

I have seen some printers use soda cans that were cut into strips as a wipe area.

Hi guys,
Whats the least amount of wires have you been able to get going to your Carriage? I am planning to use a DB9 breakout board for the following:

Here's what I have with sensorless homing

3 - Two fans (common +12V)
2 - Thermistor
1 - GND
1 - Servo (BLTouch)
1 - Signal (BLTouch)
1 - +5V (BLTouch)

Total: 9

Heater Cartridge: 2

What do you guys have?

@dc42 said in Which EPCOS 100K thermistor:

Can you ask the company you bought it from what part number it is?

I can ask but it was from one of the generic Chinese vendors on Aliexpress

@vlad said in Which EPCOS 100K thermistor:

@chanders testing hotend with IR thermometer is not at all a reliable way to do this. IR thermometers are crazy inaccurate on metallic surfaces and also surface temperature itself is different from inner temp.

I was measuring the hotbed directly on the trace (coated side). I didn't realize IR thermometers were so inaccurate. The documentation siat the accuracy was +/- 1degC

I like many other hobbyists I am sure have received EPCOS 100K thermistors for their build.

I have selected some values found on the forum here but after testing with my infrared thermometer, it’s about 10degC off (actual temp is less).

My thermistor didn’t come with a marking or data sheet. How do I know which one I have so I can go look for the data sheet?

Thanks in advance!

Why does my heat map show so far below the plane even though I have my Z offset for my Z probe setup in config.g?

https://imgur.com/gallery/heUQf

@DjDemonD:

Also the manual calibration routine which now runs if you have no probe configured, actually works quite nicely. I used it on my XL machine when I was having a wiring issue with the probe. Just jog up and down, use piece of paper and show the firmware the probe heights at each point and you're done.

Does the Duet have a manual calibration routine?