Delta Homing issues

Code

Hello,

This is my first printer build and while i'm making good progress I've been stumped by a couple things. Hopefully I can get some hints. My printer is based off the boots biv1 rostock from thingverse. It's running sainsmart mega/ramps1.4 hardware with repetier firmware. I am using repetier host as well. My initial configuration was completed through the online tool.My google foo is weak when it comes to this so I really appreciate the help.

1) The machine homes fine but its LOUD. Do i need to modify the feedrates?  

2) When I sent the machine the command to move the effector 30mm above the bed it crashed hard. I just found that my Z_MAX_LENGTH was incorrect which I just changed, haven't tested that yet though. Should the X, Y, and Z max lengths equal?

3) In the host when i home the X, Y, and Z coordinates in the manual control tab stay red and do not turn black after homing. According to the documentation I've read they should. Now I just re-measured the Z lenght and found it was way out like i mentioned in item 2. Other than that i'm not really sure where to start. 

Thank you again!!

Code

Hi all! 

After getting home I got into the config.h and started playing with the feed rates. Looks (sounds) like the noise issue is solved. I changed the z max feedrate and z homing feed rate from 2 to 8. Also, repetier host looks like it recognizes it's position now so that's looking better.

I do still have an remaining issue though. When I manually move the z axis down 1.0 through the host it moves the effector more like 15mm. I am using spools and spectra line so no belts. The spools are 24.4 mm in diameter at the smallest portion. so my circumference should be 76.96. 3200 / 76.96 = 41.58 (i set it to 41 just for testing). I would expect 1.0 through the manual arrow controls to move it more like 1 mm. Am i mistaken on the units displayed? I'm assuming i'm not so any help with this remaining issue would be greatly appreciated. 

Thanks!!

MrBaz

Your circumference is actually 76.65mm.  Therefore one full revolution of rotation gives 76.65mm of linear motion.

You are most likely using 1.8* steppers.  That means there are 200 steps for a 1:1 in rotation.  If you are running 1/16 microstepping, then you have 3200 steps per revolution.

3200 / 76.65 = 41.75 steps/mm

If you somehow are only running 1/8 microstepping, then you have 1600 steps in one rotation.

1600 / 76.65 = 20.87 steps/mm

That would give you a difference of 20.88mm of larger movement.  I would check to make sure you are at 1/16 microstepping.