I have a 7x8 Craftex from Busy Bee tools. If the controller on yours is similar to mine then there is a high current cut-out when the motor is under too high a load. I managed to increase the cut-off current by adjusting the trimpots inside the controller. My controller has three trimpots, one sets the low speed limit, one the high speed and the third the current limit. They are not marked with their function. There seems to be are fair amount of interaction betwwen the trim pots. If you plan on trying to adjust them there are a couple of things to remember. They are multiturn devices, only turn one at a time and keep track on the number of turns you move it. There is no hard stop on the adjustment when it reaches the end of it's travel the adjustment screw will still turn and you will hear a small click with every turn. If you reach this point and continue to count these turns it will be impossible to return the trimpot to it's original location. Check the operation of the controller after every adjustment you should be able to determine the function of each trimpot with a few adjustments of each. Return each trimpot to it's original setting before you go on to the next one. The high and low trim pot should be fairly easy to identify. The one that sets the current limit can cause the controller to do some strange things. At one setting the motor would only run at full speed independant of the speed setting. The way I set the current limit was to run the spindle at low speed and brake the chuck with my fingers until it stopped, adjusted the limit and rechecked how much effort it took to stop the chuck. I found that the limit trimpot also affected how well the controller regulated the motor speed. At some settings of the trimpot the motor would acellerate considerable when placed under load. With some time I was able to get a fair comprimise between over current cut off and speed regulation. I wasn't able to fully eliminate the high current cut off as I would have liked. I should mention that I had to also adjust the high and low speed trimpots as I adjusted the current limit to maintain proper controller operation. I'll let you guys know if I do figure out how to eliminate the high current cut out completely  |