The RAVEN is a servo system. That means that each axis has a sensor called an encoder that tracks the movement of the axis. The on-board computer commands each axis to move a certain distance over a certain interval of time and then compares the actual distance traveled (by reading the encoder) to the distance it was commanded to go. A stall is caused when the difference between the commanded distance becomes much more than the actual distance over the allotted time interval. An easy example of this would be putting your hand on the cutting truck and preventing it from moving during an operation. The computer is commanding it (and expecting it to move a certain distance in a given time interval) but your hand is preventing it from moving; or stalling the movement. A stall does not have to be a physical obstacle to movement. For instance if a bit is dull it can keep the truck from being able to reach the commanded distance.
Stalls are usually recoverable. If a stall is reported do not power off or crank the head up. Determine the cause of the stall and resolve the problem and resume the project. Stalls always have a cause. If the cause of the stall is not resolved the stall will continue to occur.
Y Stalls
Possible causes of a stall are overly aggressive cuts, a dull bit, debris under the roller bearing, debris in the teeth of the drive belt, or a part of the project breaking loose and jamming the truck.
Dull bits or overly aggressive cuts will often show up as ragged or burnt cuts. Check the Y Truck by moving the Y truck side to side by hand.
- If the truck is moving easily check for a dull bit.
- If the truck is loose adjust the rollers using the cam roller wrench.
- If the truck is hard to move there is most likely debris logged under one of the rollers or a damaged wiper. Pull the wipers off and move the tuck back and forth (blowing or wiping the rollers off if needed) until the truck moves freely.
Once the cause of the y stall has been determined and resolved the project can be resumed. When resuming from a stall the machine will first rehome. If the original home location has shifted the machine will report “Belt slip detected”. The Y belt tensioner acts like a safety valve keeping the belt from stretching or braking in an overload situation. Once the tension has been pulled off the Y belt must be re-tensioned and the tensioner tightened down. If the Y belt is not re-tensioned it will continually skip teeth. https://support.carvewright.com/tensioning-the-y-belt/
Once the Y belt has been re-tensioned has been reset press ENTER and the machine will reset home and resume the project.
Z Stalls
Z stalls can be caused by debris logged under one of the rollers just as with the Y but more often Z stalls are caused by bit issues. If the stall occurs when the bit first starts to enter the board, it may be the feed rate is too fast or the bit is just being slowed down in the initial plunge (resuming will usually succeed). This is often seen with pard plastics. Check for a dull bit and check the Z Truck by moving the Z truck up and down by hand. Once everything is checked and moving easily, resume the project.