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Messages - ggallant571

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16
Trouble Shooting / Re: X Axis Issue
« on: November 03, 2020, 04:59:25 AM »
The driver boards (usually 20-pin) have a user adjustable pot that limits the current to the motor(s). They have a formula that converts the voltage reading to max current. Too little current and the motor can stall, too much and it can overheat. You typically measure the voltage from the screw on the trim pot to GND. If I recall correctly A4998 drivers want something in the range of 0.4V to 0.5V per motor. A fixture with 2 motors on the Y and 1 on the X would require different settings for each driver.

17
Trouble Shooting / Re: X Axis Issue
« on: November 02, 2020, 05:42:22 PM »
You could have the current limit set too low. What are your stepper motor drivers? Do you have a volt meter?

18
Cutting / Re: Laser module for cutting 3mm plywood
« on: October 26, 2020, 10:47:13 AM »
Sadly the 5.5W will be 11 times worse on focus. Perhaps you could get 11 0.5W, a bunch of mirrors and lenses and make your own.

19
Cutting / Re: Laser module for cutting 3mm plywood
« on: October 26, 2020, 05:49:55 AM »
Another factor is some vendors are now listing the raw input power, not the effective optical power. Diodes seem to be about 15% to 20% efficient so a 20W might be more honestly labeled a 3W.

I have 1.6W, 2.5W, 3.5W 1.5W & 15W modules. The 1.6W provides the sharpest focus, 2.5W visibly worse but used daily, 3.5w & 5.5w useless. The 15W was the cheapest,  is close to 2W output power, and came with nice optics.

20
General Discussion / Re: Odd behavior at low power
« on: October 25, 2020, 06:55:00 AM »
I agree that laser mode with M04 SHOULD help improve the situation. The problem occurs on;y on the leading edge of new rows. Mechanically the mechanism has to reverse direction at that point. I do not see any problems on a test pattern that gives the mechanism 2mm to accelerate prior to enabling the laser. Time for "better' test. Attached is the file that exhibited this condition. The left edit of the "P" and the right edge of the "A" should the worse. Under the microscope it is every other row.

21
General Discussion / Re: Odd behavior at low power
« on: October 24, 2020, 09:24:57 PM »
Switched to using a test pattern that is good for showing individual lines.

While in laser mode lowered acceleration from 5,000 to 2,000 and test pattern looks worse. Upped to 10,000 and it looks better.

Beginning to suspect that the quick reacting paper is part of the problem. If I up the power level I get more consistent results. Tomorrow will also see a change in the power supply.

BTW - laser lines look really crappy under a microscope!!

22
General Discussion / Re: Odd behavior at low power
« on: October 24, 2020, 05:43:47 PM »
Using M04. Should this work in non-laser mode?

23
General Discussion / Re: Odd behavior at low power
« on: October 24, 2020, 05:37:22 PM »
Will check. Disabled laser mode and the entire line seems to be burning darker. Wondering if there is something wrong with acceleration. My fixture is a core-xy.

24
General Discussion / Re: Odd behavior at low power
« on: October 24, 2020, 03:45:24 PM »
Been away for a few days. Laser mode is set. Extra burn appears to occur when when machine is decelerating. My host application move the head at a high speed (4000mm / min) to the first point on a line. Will try again with:

  1. Slower traversing speed.
  2. Starting point 5 mm early.
  3. Laser mode OFF.

25
General Discussion / Re: setting machine parameters
« on: October 23, 2020, 02:13:37 PM »
Can you post your grbl parameters? What is your test case?

26
General Discussion / Re: Odd behavior at low power
« on: October 20, 2020, 05:48:36 PM »
Gaps greater than 5mm typically use a faster speed but in this case they were set the same.

27
General Discussion / Re: Odd behavior at low power
« on: October 19, 2020, 06:39:23 PM »
I will check but think that is already set. Even if it isn't set, why get the heavy first pixel. After gaps with zero power it behaves ok. Just the first on every line.

28
General Discussion / Odd behavior at low power
« on: October 19, 2020, 12:24:35 PM »
I am etching some material that reacts to the laser at low power. My problem is the first pixel on every line, from both directions, is much darker than the rest of the line. I am not sure of the exact length but it looks like single pixel under the microscope.

29
Engraving / Re: GRBL 1.1e burning weaker
« on: October 11, 2020, 09:26:30 AM »
Looks to me like it is time to fix/cleanup the artwork. Also using a complex image to adjust machine settings can be frustrating.

30
Engraving / Re: GRBL 1.1e burning weaker
« on: October 08, 2020, 08:44:42 AM »
Look at $110 & $120.

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