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Messages - ggallant571

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Revised 100x100 square svg test file.  Previous was my mistake!!!! Hope this one is better.

Please post your test files. I use Linux so svg is the easiest for me to use.  gcode is also ok. Attached is my 100x100 square test file.

Trouble Shooting / Re: Laser stops like the power is turning off
« on: January 17, 2018, 05:36:20 PM »
My (now dead) 5.5W laser consumed 3.0A at about 60% power. That happens to be is the limit for my bench supply with builtin current meter. 36W!!  I do not know if that is typical or a faulty laser module.

LaserGrbl / Re: LaserGRBL doesn't switch the Laser ON
« on: January 16, 2018, 07:49:51 PM »
I was unaware that it is possible to control the power on the USB port from an application running on a host computer. Perhaps this explains the difference in behavior.

I wonder what GRBL does if you emit S1000 and the range is set to 0..255. If it limits you would get 255. If it just set the lower 8 bits you would get 232.

LaserGrbl / Re: LaserGRBL doesn't switch the Laser ON
« on: January 16, 2018, 11:49:18 AM »
I tend to think it is best solved by adding the pull-down resistor. I also think disabling the DTR at the host is an option. I use Linux and have 3 etchers, one pulse on com port select, the other two don't. Could be they have different USB chips and that means different host system device drivers. Perhaps that is also possible on Windows.

Do the simple shapes to verify size and speed. A square with sides of 100mm should take 1 minute at 400 mm/min and the size should be within 0.1 mm. The larger the size the easier to measure for accuracy. I link 250mm square when the frame supports it. Next shapes could be a triangles and then circles.

Mini CNC / Re: Sieg ?
« on: January 16, 2018, 09:00:57 AM »
When do you think you will have BCL ported to control the lathe? Mount the laser on the power feed.

General Discussion / Re: Slate problem
« on: January 15, 2018, 04:59:33 AM »
Thanks. I had been using a 5.5W laser for slate and it would not do anything as small as 0.3mm resolution. Just blasted out big chunks (0.5mm). It has died and I am still learning what the lower power lasers are capable of. So far mirrors and wood appear better, slate worse.

General Discussion / Re: Slate problem
« on: January 15, 2018, 03:42:08 AM »
@Thothloki - I am curious about the 0.2 spacing. Many of the lines are 3 pixels wide which is 0.3mm. Did you get every other line?

5V on the S pin could be floating. Sure would be nice to have a schematic!!!! Hint hint

EleksMaker Mana SE / Re: So mine is TTL?
« on: January 14, 2018, 10:34:23 AM »
I've been running the 8KHz for 18 months now with no ill effects. I especially like the shorter weak laser pulse.

EleksMaker Mana SE / Re: 5.5w keeps burning my MOSFETs
« on: January 14, 2018, 10:30:28 AM »
I think they used LR7843 with 100 ohm series resistor on the original L7 and switched to a TTL level switch on newer controllers. I fried a few 7843 chips along with the trace on one controller before finding the the Nano was not driving high properly. I purchased, but never populated some TTL MOSFETs. For my home brew controllers I used a dedicated mosfet driver chip. MOSFET cost about $1.50, driver about $4.50.

General Discussion / Re: Slate problem
« on: January 14, 2018, 10:22:21 AM »
OK. I used 0.1. What speed?

General Discussion / Re: Slate problem
« on: January 14, 2018, 09:17:23 AM »
.2 what?

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