thermocouple setup

boelle

i use the dev branch and have not had any major issues with it

only the G33 which i will retest this week as soon new stepper drivers from watterott comes in. so far i'm on a 20/7-2017 relase

but i would also like to change out the bed thermistor for a thermocouple as i have to disassemble the who bed assembly to change out, and i have an idea that a thermocouple is a bit more though.

in the online config i can select MAX31855,  but where do i select the CS pin ? is it the Temperature sensor pin

HEATED_BED_SENSOR_PIN ?

Repetier

Yes, HEATED_BED_SENSOR_PIN  becomes the cs pin.

G33 has changed a bit with yesterdays release. Hope to have fixed some bugs with offsets.

boelle

you will know today... 

right now i'm soldering up some tmc2100 drivers and once i have them in place i will do a G33

boelle

i ran a G33 and got this:

https://imgur.com/a/TYwdD

it seems like the old error is still there, if it helps config is attached 

boelle

 

Repetier

Are you using the dev version?

boelle

yes, and i downloaded it today

i still have the old dev version that works so i can switch back and forth

Repetier

The new version should home if necessary and go to a position where enabling is possible. I need more information to debug this since it is working fine on my delta. What happens when you start at a valid position like center of bed? Are your configured edges inside reachable area? What exactly happens and at what stage do you get the message? Log?

boelle

first my manchine is a cartesian one

the same thing happens no matter where i start

what happens is that it homes and then it try to go past my X endstop

i could get a log if i knew where to get it

maybe  a short video would be better if i can get my phone to do it in decent quality

boelle

and my configured edges must be valid since it worked on the dev version published 20/7-2017

i see that my config did not get attached 6 posts up

here it is: https://pastebin.com/9i2aAB5e

that should at least tell if my config is valid or not

Repetier

#define Z_PROBE_X_OFFSET 19
#define Z_PROBE_X1 18
#define X_MIN_POS -3

#define DISTORTION_XMIN 18

#define DISTORTION_YMIN 23

Just for reference the important config options for the problem.
After homing you are at x = -3 and for the leftmost position it will be at -1 so 2 mm a part from x endstop. But at xhome positions it can not activate z-probe.

For initalization it calls void Printer::prepareForProbing() which is a new function to prepare to a valid state and I guess there the error starts.

At beginning it homes, which works.

Next is going to safe position, which is not needed on deltas, so I could not test that part (have only a delta with z probe).

Computation of target x position

    if(ZPOffsetX > 0 && targetX - ZPOffsetX < Printer::xMin) {

        targetX = Printer::xMin - ZPOffsetX;

    }
that is -3 -19 = -22, so guess that is what you experience.
Correct would be
        targetX = Printer::xMin + ZPOffsetX;
like I wrote in the remaining 3 cases.
Have updated the firmware and should now work better.

Thanks for the bug notice.

boelle

just to be clear 

at home nozzle is at -3 on X

the probe is monted on the other side of the nozzle so it will be at X15

why i say this is that i have become unsure if my config is wrong

Repetier

No, as I said my computation for x was wrong. Config looks good. Just try new version I just uploaded.

boelle

had a chance to test it today

works fine now on my mendel90 :-D

andrewpaul1

Perhaps working out which Thermocouple is right for you may assist? Check out https://www.pyrosales.com.au/blog/cat/thermocouple/post/which-thermocouple-is-right-for-you

Or feel free to call one of our offices (see our contact page)

Good luck