Einsy build Z height issue during XYZcalibration

During the xyzcalibration x and y calibrate then when it goes to z it goes up then down javascript:editor_tools_handle_color()and start doing the circular pattern about 10mm from the bed.
I amusing the 8mm acme screws for Z. and firmware 3.5.2. It will calibrate z alone and calibrate the bed. The bed is all aluminum so I am not sure how that will work with some of the software yet.

I think i figured it out pitch. I think prusa has a 4 start thread mine is a classic 1 start.

The image show both the T8 4 start and the T8 single start lead screw both have been turned one revolution 360 degrees.

The first travels 8mm the second travels 2 mm.
I converted from a T8 4 start to a T8 single start because every time I tried to Print the Z axis was out of calibration when using the T8 4 Start lead screws.



Why because every vibration cause the lead-screws to turn thus I had to calibrate before every print.

T8-8 Lead-screw Drop with Gravity
[youtu.be]

Edited 2 time(s). Last edit at 03/09/2019 06:57PM by Roberts_Clif.

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Computer Programmer / Electronics Technician

What settings did you use? 200*16/2? what is a good acceleration? Did you change jerk?
Do your settings work with the prusa sensorless endstops?

I Did in Marlin 1.1.9
#define DEFAULT_XJERK 7.0
#define DEFAULT_YJERK 7.0
#define DEFAULT_ZJERK 0.4
#define DEFAULT_EJERK 5.0

I Did in Marlin 2.0.x
#define JUNCTION_DEVIATION
#if ENABLED(JUNCTION_DEVIATION)
#define JUNCTION_DEVIATION_MM 0.12 // (0.02mm) Distance from real junction edge
#endif

#if DISABLED(JUNCTION_DEVIATION)
#define DEFAULT_XJERK 5.0
#define DEFAULT_YJERK 5.0
#define DEFAULT_ZJERK 0.43
#endif

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Computer Programmer / Electronics Technician

Thanks what do you use for acceleration?

Acceleration would be deturmined by your Hardware, Mine is an aluminum frame Prusa i3 Compatible with Nema 17 - 57oz steppers on X,Y,E and Dual Nema 36oz steppers on Z.
#define DEFAULT_MAX_ACCELERATION { 3000, 3000, 100, 3000 }

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Computer Programmer / Electronics Technician