Z height crash

[slausonm]

I am setting up the new LCD display and recalibrating the software, so In general I'm starting over with the software install. My machine is about 1 1/2 years old and did not come originally with the LCD. It seems to be fine and powers up and displays information.

I am at the point where the manual says to run G0 Z10 F3500 which should rapid traverse and stop the nozzle 10mm above the heated bed. I measured the nozzle height and it measures 354 (including the added 2mm) from the nozzle to the heated bed with the glass on it when the machine is at X0 Y0 Z0. When I run the code it crashes into the bed. So far I have trouble shot it to the point that I get a reading of 119mm when I manually jog it down and the nozzle is touching the bed. I have saved the 354 measurement in the EEPROM and I went into the Arduino software and saved it there as well. What setting is incorrect or what am I doing incorrectly?

Thanks, Matt

[cope413]

Sounds like you don't have the right setting for either your pulley teeth or steps/mm or both.

If your machine is 1.5 years old, I believe you would have the 15 teeth pulleys.

If you're trying to flash the new version of firmware, then the values will be very different.

The easiest thing to do would be to go into your original firmware config.h, copy the values for pulley_teeth and steps/mm (confirm also if you're on 1/8th or 1/16th microstepping) and copy those into the new version of the firmware.

[slausonm]

Thanks Cope413,

I counted the pulley teeth and changed it to 16 from 20 in the Config.h file, and it seems to be traversing to the correct location. Any other settings different from the old version to new? I have the Square heat bed instead of the new one so i suppose that will throw things off as well. The original files I had setup went ByeBye with the old computer

Thanks, Matt

[geneb]

16 is not a valid tooth count. For the original machined gears, they'll be 15 tooth. The new GT2 gears are 20 tooth.

...and it's only a year old at most.

g.

[slausonm]

Its difficult to see into the machine when assembled. I will change it to 15 and see how it goes. I bought the machine a few months after comming back from the makers faire in NYC in 2012.
Thanks