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Problems homing Delta bot Marlin 1.1.8

Posted by n9jcv 
Problems homing Delta bot Marlin 1.1.8
June 03, 2019 09:35PM
I am working on a Delta Bot. It is 140mm high. When I go to pronterface and home, xyz all go up and bump the endstops, then the effector moves down, but not all the way to the bed. I measure the move down at about 62mm. I can not seem to figure out why it stops short of the bed. M119 after homing shows this;
Reporting endstop status
x_min: open
x_max: open
y_min: open
y_max: open
z_min: open
z_max: open

I connect with pronterface and get this;
echo: Last Updated: 2019-4-30 | Author: (none, default config)
echo:Compiled: Jun 3 2019
echo: Free Memory: 3895 PlannerBufferBytes: 1232
echo:V47 stored settings retrieved (614 bytes; crc 63803)
echo: G21 ; Units in mm
echo: M149 C ; Units in Celsius
echo:Filament settings: Disabled
echo: M200 D1.75
echo: M200 D0
echoconfused smileyteps per unit:
echo: M92 X80.80 Y80.80 Z80.80 E80.00
echo:Maximum feedrates (units/s):
echo: M203 X300.00 Y300.00 Z300.00 E400.00
echo:Maximum Acceleration (units/s2):
echo: M201 X1000 Y1000 Z1000 E1000
echo:Acceleration (units/s2): P R T
echo: M204 P1000.00 R1000.00 T1000.00
echo:Advanced: S T B X Z E
echo: M205 S0.00 T0.00 B20000 X5.00 Y5.00 Z5.00 E5.00
echo:Endstop adjustment:
echo: M666 X0.00 Y0.00 Z0.00
echogrinning smileyelta settings: L R H S B XYZ
echo: M665 L271.50 R135.40 H140.00 S80.00 B95.00 X0.00 Y0.00 Z0.00
echo:Material heatup parameters:
echo: M145 S0 H180 B70 F0
echo: M145 S1 H240 B110 F0
echotongue sticking out smileyID settings:
echo: M301 P22.20 I1.08 D114.00
echoconfused smileyD card ok

The M665 line seems to indicate the my delta height is 140, which is correct.

After homing and moving down, I run M114 and get this;
X:0.00 Y:0.00 Z:78.27 E:0.00 Count X:25339 Y:25339 Z:25339E:0

So I am not sure why M114 reports 78.27, why I measure 62 Total that would be 140, but I don't get it. Any ideas?

Re: Problems homing Delta bot Marlin 1.1.8
June 03, 2019 09:46PM
I should also add, that after homing I can go all the way to top or bottom with these commands;

g0 z0 all way to the bed

g0 z140 all the way to the top

so I am puzzled why the homing stop midway to the bed
Re: Problems homing Delta bot Marlin 1.1.8
June 03, 2019 09:58PM
Bingo, I found it with Google's help of course!!!!

There is an option #define DELTA_HOME_TO_SAFE_ZONE, which causes the effector to move down to an un-restricted movement area after homing. I commented that out and now it just homes to the endstops and stays at the top. That was puzzling!!
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