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Type: Posts; User: jfong

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  1. Replies
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    Re: Lightening Strike Fried My Controllers

    Same thing happened to my house about 5 years ago. Took out just about all the electronics and appliances in the house. Anything that was connected via Ethernet blew too. Surge protection and UPS...
  2. Re: Two stm32f103 boards Firmware MOD-UPGRADE for laser etcher-cutter CNC 3D printer

    462674
    here is the bitsensor stm pinout and the corresponding grbl assignment
  3. Re: Two stm32f103 boards Firmware MOD-UPGRADE for laser etcher-cutter CNC 3D printer

    I looked into this a few months ago. One major problems is the stm32 grbl code as written requires the step and direction I/O to be on the same port. The Bitsensor board has the step and direction...
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    Re: Question about GRBL Arduino CNC systems.

    You can buy standalone grbl controllers on AliExpress. Basically a grbl board with a secondary controller board connected via serial port. The secondary controller is usually STM32 based with lcd...
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    Help Me Drive Some Servos Please!

    Always better to have the highest encoder ppr. Not so much for resolution but for better Servo performance. More ppr counts the driver has available, the more data to calculate PID and all that...
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    Help Me Drive Some Servos Please!

    I priced out those types of couplers and they are not cheap. Any of the very low backlash ones are pricy.

    Good that you have the pin out. All differential signal output which is very good.
    ...
  7. Replies
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    Re: Help Me Drive Some Servos Please!

    Normally when encoders are listed as 1000lines, it will be 4000 pulses per rev with 4x quadrature decoding.

    Several months ago I looked at the data sheets and manuals for the JMC and couldn’t get...
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    Comparison of two drives and advice?

    Nic77,

    My brother needs the larger 3D printer to print out mold forms. They are rectangular so it would of been better to make the printer that way. I was limited by the linear rail length I had...
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    Re: Comparison of two drives and advice?

    Nic77,

    I started a corexy build a couple years ago using extrusion and THK, NSK 20mm rails. The Z is a THK KR series linear stage.
    400x450 travel. Using nice Parker stepper drivers to test...
  10. Replies
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    4,073

    Comparison of two drives and advice?

    NIC77,

    Not really sure about the expansion capabilities of the different DUET boards. I’ll find out soon though.

    I have a bunch of brushless drivers. Applied Motion, Copley, AMC, Baldor etc....
  11. Replies
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    Comparison of two drives and advice?

    To NIC77

    I have a duet clone with the Trinamic TMC2660. It’s still in the package but will do a bench test soon. I think you will like the Trinamic chips for a 3D printer. I currently use...
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    Comparison of two drives and advice?

    Not necessarily. Many of the industrial drivers are still rather old tech. Many are designed years ago but are still in production. They do usually perform really well. They may not be the...
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    Comparison of two drives and advice?

    Here’s my test of the TMC2160, different version from yours but the output waveform should be same. It’s a very good stepper driver chip.
    ...
  14. Parker Compumotor as spindle motor - drive question. Help

    Finding compatible drives can be hard. You need to check part number and the datasheet for exact version. I screwed up and bought a Baldor Flex+Drive 2100 watt servo drive that I thought was encoder...
  15. Re: How CNC lasers manage such high feed speeds?

    Most laser use the mm/sec designation for speed.

    100meters/min = 1666mm/sec

    Or 65inch/sec
    Or 3900in/min

    The highest end Epilog and Trotecs have no problem reaching these speeds. I think...
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    Treadmill motor torque

    I found a Dart speed controller on eBay for $50 to run my DC treadmill motor.
    I got a 253g-200e 2hp enclosed.

    The original 1/2hp on my wood lathe stalls easily under load. I’m hoping the...
  17. Re: Which FIRMWARE ??? grbl / smoothieware/ marlin / G2core / ???

    Here’s is another STM32 firmware, mini gerbil, that I tested.

    https://embeddedtronicsblog.wordpress.com/2019/08/03/testing-mini-gerbil-firmware/
  18. Replies
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    Poll: Re: Custom Large Glowforge Practical?

    The camera feature in Lightburn works rather well. I use the official camera they sell. May not be perfect but good enough for image placement once everything is calibrated.
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    Poll: Custom Large Glowforge Practical?

    Ya those servo motors are high speed probably greater than 3000rpm. I’m assuming this is for a large machine that moves a fairly sizable gantry laser system. Maybe a industrial metal cutting laser. ...
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    Poll: Custom Large Glowforge Practical?

    I use a Cohesion3d first gen mini board on my K40. It works really well with Lightburn.

    I also have a Re-Arm and many other controllers.

    I recommended the Ruida because it is more common.
    ...
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    Poll: Custom Large Glowforge Practical?

    Use standard Cartesian instead of h-bot. This keeps the x axis belt length shorter. For the size of your machine, use wide belts. Almost all large format lasers are Cartesian using 10-15mm width...
  22. Which FIRMWARE ??? grbl / smoothieware/ marlin / G2core / ???

    Not my port, by Bart Dring, I’m just testing functionality. Under high speed rasters, there is jitter. I opened up a github issue #78 with Bart and he knows about the problem. I sent him scope and...
  23. Which FIRMWARE ??? grbl / smoothieware/ marlin / G2core / ???

    The arduino UNO or Mega2560 both run at 16mhz so same raster speed. Although you could change the xtal to 20mhz and recompile for the higher speed. They work fine for vector cutting but as you...
  24. Which FIRMWARE ??? grbl / smoothieware/ marlin / G2core / ???

    I use both smoothieware and grbl-lpc on a cohesion3d board. This board uses the same 32bit mcu as the smoothieboard. With Lightburn laser software, it controls my k40 laser. Since it is a fast ARM...
  25. Re: Elm-Chan smc servo controller programming and tuning

    That’s the fuse settings I used. The difference is probably minor such as different brown out voltage setting etc. I don’t recall why I choose the fuse setting. The one that matters the most is the...
  26. Elm-Chan smc servo controller programming and tuning

    That’s my video I made using the BTS7960/ELM-Chan code. Glad you found it useful. It was just a quick test to see if it worked. Biggest limitation is the max 24volt supply.
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    Re: Anyone here using Lightburn?

    I was one of the early beta testers. I use it on my k40 that has been upgraded to a cohesion3d controller. There is no laser software currently that works as well as Lightburn for ease of use and...
  28. what do other systems provide that arduino/GRBL so no

    That repository hasn’t been updated in awhile. This one is based on the same code base but has been updated with several bug fixes. Compiled with no problems using TrueStudio. Coocox is no longer...
  29. Re: what do other systems provide that arduino/GRBL so no

    Lots of grbl forks but you have to ignore all that are older than the 1.1f codebase. The main grbl is now at 1.1g. The g version is just very minor updates.

    If the maintainer of the fork...
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    Re: Software & Breakout board question

    Yes I did on a arduino DUE but like you I hated the few compatible gcode senders. I did end up using CNCjs to test. It’s been awhile since I looked at it. Lack of Save settings was annoying....
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