Hi Steve, I made it quite close to 1 minute per revolution using the following: case 0: // 3.6 RPM for SP6 with 400 step motors           motor_steps = 384;           extra_steps = 0; // no extra steps needed           min_motor_delay = 4980;           max_motor_delay = 5250;         break; I will confirm the exact time once I get a chance.

Hi Steve, i think my motor is 200 step one, see the picture. I bought another one with the same 1.8deg, and both motors gave 30s per rev. Does the wiring of the motor matter (the order of black, green, red and blue). I am using black, green, red, blue, and the motor seems working too, althoug it is different from your instruction: black, green, blue, red.

It seemed one connection was loose so I soldered it again. The RTC is detected, and speed option is 3, but the seconds hand still rotates at about 30s per rotation. Anything else I can try?

My motor is 200 steps per rev. I tried the degug mode, and it seems the RTC is not detected. I tried a another RTC, still no luck. Any suggestions ? thanks !

Hi Steve, Is this 0011 setting? Are the four jumbers for adjusting speed? I tried all 16 posssibilities (0000, 0001, ....) and none of them gave 60s per rotation. The 0011 gave about 30s per rotation. Any suggestions? thanks !

Hi Steve, Can you help me understand how to adjus the rotor speed? Right now, the second-hand moves at 108s per rotation. My current CNC shield is set as shown in the picture from the Instruction. What settings I can do to change the speed? thanks,

That makes sense. So the only arbor that rotates is the Gear 2 for second-hand? and for all other gears, it should be idearly frictionlessly rotate of the arbor?

Hi Steve, I was able to make the rotor work by using a different Adruino Nano board. The IDE didn't detect the previous board. Thanks so much for your help !

I thought I don't need to do the four edits (three in the back, one in the front) with the Black board version?

Hi Steve, if I use the keyestudio CNC shield (black board), do i need to do any change of wiring? Do i still use the same clock.ini file?

Hi Steve, There are two power source here: 12V for CNC Shield and micro-usb for the Adrinuo Nano board, do I need to use both ? Most youtube videos use both. thanks,

Hi Steve, I did use the "Clock_Shield.ino" file. Do i need to make any changes to the code or just load it directly in IDE?

Hi Steve, Just to confirm, do l load the "stepper_smooth_lookup250.txt" file in the Adruino IDE, and do I need to make any changes to the file for SP6 specifically? thanks,

plus, the red CNC board has been extremely frustrating to work with. I am wondering whether the CNC board (CNC Shield V4) still needs the modification you listed because your version is in 2023. thanks a lot for your patience.

Hi Steve, Do I need to run the Adduino upload first before the rotor can be turned on? I tried to upload the clock_shiled.ino, and i selected the board and port, but I got this error below: avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x00 avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x00 avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x00

Hi Steve, below is my set-up. The motor I got from amazon has different color order from the one described in your manual so I changed it to make them the same as yours. And I removed a jumper from the "Stop" pin on my CNC borad to match yours. When I connected to the board to a usb output, the Adruino board is on and the TMC2208 is warm, but the motor doesn't rotate. When I touch the heat sink of TMC2208, the rotor vibrate back and forth without rotating. Do you have any advice on how I can debug? thanks,

Hi Steve, sorry for this seemingly obvious question. When I load the stl file "frame-front-1.stl" using the software that comes with my printer Bambu Studio, I only see one stl file, and I was not able to select individual numbers to delete or replace them. Is it possilble that I need a different software to edit this stl file? I tried PrusaSlicer, still no luck. can you let me know where I did wrong or should I use a different software? thanks,

Hi Steve, i have a question about the Adruino nano board. The one I got looks slightly different from your instruction manual. It looks like this. I guess it should also work? In your manual, the first step is to "Solder the headers onto the Arduino Nano and insert it in the orientation shown." What "headers" I need to solder before I plug it onto the CNC? thanks,

thanks so much, Steve. Should I do the wiring first then install the "clock_shield" or the other way?