![]() ![]() simple solution would be to use a 5v change over relay switched on by the software spindle on/off opto and connect the common pin to the Fet driver stage, with the normally closed pin to the micro output, and the normally open to the external PWM i/p. ![]() The when software switches the spindle on it automatically connects the PWM signal direct to the Driver stage. That is probably as simple as you would want with the 3040 Hi.so, for cheapness the PWM controls the RPM manually?.switch it on and turn the pot to get the speed you need? #Deskcnc controller driver# Who needs to vary the speed on the run in the middle of a program when you're dong a job from beginning to end with one cutter, and without a tool changer, and only needing to go up or down on the RPM at the beginning of the work for the cutter mounted. PWM circuits come on small matchbox sized boards to control DC motors and have manual rheostats to control the output to the motor.sold on EBAY etc for various purposes.dimmer switches do the same but will work for AC motors at mains voltage levels too. If the output was electronically controlled instead of manually by varying the resistance you would be able to apply a variable voltage to achieve the RPM variation. The control pot is just a centre tapped variable resistance, so possible that resistance can be varied electronically to the circuitry you have instead of the manual pot.just thinking.I'm sure there are circuits around that will apply an output to a DC motor electronically instead of manually. Hi, if you just want to enable the current set-up to work with Mach 3, browse EBAY for some info, they are selling motor kits with ER11 mounted chucks and state that they can be run controlled by Mach 3.the pot manual speed control is removed to enable Mach 3 to work. ![]() There's a couple of motor kits for sale, brushed and brushless, 400 to 600 Watts with the speed controller, and some with full ER11 collet sets too, prices range in Oz $ from $125 to $250 post free.Īs your machine is a 3040 I think it has the same motor as the EBAY 400 Watt ones I mentioned. ![]()
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