My longer B1 30 watt has been working great for 3 months of heavy use. I was going to cut one last thing before quitting today. BUT the engraving was to long. I did some testing and cut some 2x2 inch squares. They were all 2” wide but 2 1/4” long. Tried a 2” by 4” and had the correct 2 width but was about 4 9/16” long.It seems the longer the dimension for more it is off. I have no idea where to look for this problem. Let me know what info you might need to help. This is with a GTBL - Longer B! 20W 30W 40W profile provided by Longer. UPDATE if I switch to just the GTBL profile it cuts the correct sizes.
Look at GRBL parameters $100 and $101. Typical values are 40, 80, and 100. What you are looking for is that they are equal.
Any chance you made a parameters backup sometime in the past?
Thanks for the reply. I am very new to Grbl and don’t know where to look or how to change these.
Dave
Make sure you have not (inadvertently) enabled Rotary Mode:
Thanks, will go out now to the garage and check that. It is 19 degrees here right now.
Not in the Garage I hope!!! 
In the Console window, enter $$ and it will list all the GRBL parameters.
Change nothing without knowing what it does, why you are changing it, and what the expected result will be. Always make a backup copy before changing anything. You can copy them from the Console window and paste to a text file.
Thanks, that was the problem. I now remember reading about the rotary mode causing problems since it was so easy to accidentally
Thanks for the info. I do have a small electric heater that keeps it at around 60 degrees when it is this cold. I have a My Buddy heater that I only turn when I am in the garage and have my ventilation system going with a very small crack of the garage door being open (no windows). Also have air and CO monitors going.
Thank you very much
This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.