General Category > 3D Printers
First test run
sla_newbie:
Hi,
I tried a test run today and faced some difficulties as follows:
1. I tried to test the setup by piping the Lasershark_stdin_circlemaker.exe to Laseshark_stdin.exe but I get an abnormal movement of the galvos and after a couple of minutes the galvos are starting to heat up.
2. Also, in the Lasershark_stdin_input_example.txt file, it's given the format of the input is
S=X,Y,A,B,C,INTL_A here the TTL controls are last two parameters but when I try to run input the png file and run the lasershark_stdin_displayimage.exe I get the X,Y,0,0,0,1 the last 3 parameters are same no matter what. Can you me some insight on how to achieve TTL control? the laser is always on and the laser being projected is different.
3. No control for C parameter, when I write the flag -c it says illegal parameter.
I am attaching photos for your reference, thank you
Macpod:
I do not believe you have been sold 20k galvos. Normally the mirrors on higher-speed galvos are smaller and trimmed at the corners to reduce weight and allow faster speed operation. I suspect these are 10/15K galvos
It is normal for galvos to heat up but not excessively so. Perhaps a better metric to determine if the galvos are being over-driven is the sound. If it sounds bad/scratchy/etc it is :)
Based on your other post I see you have compiled the lasershark host applications yourself. Have you tried piping in the circlemaker input into lasershark_stdin? This would be a good test to make sure lasershark_stdin has been compiled properly.
Macpod:
I mentioned the kpps rating as I see from your output you are running at a rate of 20,000kpps. For circlemaker that is probably fine but for the displayimage app you may need to reduce that.
1. To start diagnostics, lets focus on the laser on/off state. The laser should be off before you run circlemaker and should turn off after you stop circlemaker. If it is not, something is not wired correctly. Did you solder the provided polarized headers to the LaserShark board and connect wire? Did you verify gnd is going to gnd and the other line is going to +?
2. For diagnostics lets just stick with the circlemaker output. If everything works as expected this should draw a circle. What do you currently see drawn? Have you verified the laser is properly reflecting from one mirror to the other? If it does not draw a circle, what does the output look like?
sla_newbie:
I have soldered the headers and the wiring is also correct, but I have a concern in my power supply I am using galvo drivers that takes 15V as input and the laser driver takes 12V input. So is anything wrong with the power supply I am using?
Attaching pictures
Picture 1: Lasershark connection with soldered headers
Picture 2: Galvo drivers (+/- 15V)
Picture 3: 12V laserdriver (+/- 12V)
Picture 4: Power supply units
1. Also when I pipe circlemaker to stdin the mirrors are moving too fast and no image is being projected (Maybe I am overdriving the mirrors like you said. I am looking to replace the galvo setup to 20kpps)
2. Even though I am running the galvos at 20kpps for png file I see no vigorous movement of mirrors(but no movement in Y mirror )and the laser is always ON before operation and even after operation.
I am a newbie to this area and field with no prior knowledge please bear with me and enlighten me.
Macpod:
--- Quote from: sla_newbie ---I have a concern in my power supply I am using galvo drivers that takes 15V as input and the laser driver takes 12V input. So is anything wrong with the power supply I am using?
--- End quote ---
It is perfectly fine to use several voltage supplies of different values (i.e. one 15v supply for the galvos and one 12v supply for the laser diode driver board).
--- Quote from: sla_newbie ---the laser is always ON before operation and even after operation.
--- End quote ---
The LaserShark pulls A/B/C lines low when the data buffer is empty (i.e. before and after circlemaker is run). The laser should turn off when the ttl + line is pulled low and turn on when the ttl + line is puled high.
Are you sure the lines between the LaserShark C header and Laser A-13 TTL header are correct? I can't see what colors are going to what pins from the pictures.
--- Quote from: sla_newbie ---1. Also when I pipe circlemaker to stdin the mirrors are moving too fast and no image is being projected (Maybe I am overdriving the mirrors like you said. I am looking to replace the galvo setup to 20kpps)
--- End quote ---
The LaserShark should still work with your galvos. No need to replace them yet. Just know they won't be as fast. In your application it may not matter.
Does your laser stay on if the ttl pins are plugged in? What image is drawn via the laser if so with circlemaker? I need to see what is being drawn (even if wrong) to diagnose the problem.
Are you using the pre-compiled lasershark_stdin.exe and lasershark_circlemaker.exe for windows?
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