Search found 694 matches
- Mon May 06, 2024 8:58 am
- Forum: Centroid Acorn CNC Controller
- Topic: ethernet communication errors...wits end
- Replies: 8
- Views: 280
Re: ethernet communication errors...wits end
Tell us about your computer. Do you have WiFi enabled? Is it a laptop? Have you followed the instructions to prepare your PC for use with the Acorn?
- Fri Apr 19, 2024 1:22 pm
- Forum: Centroid Acorn CNC Controller
- Topic: 2006 ShopBot PRT Alpha controller upgrade...
- Replies: 10
- Views: 620
Re: 2006 ShopBot PRT Alpha controller upgrade...
Contact Gary Cambell. He's helped a lot of guys upgrade their Shopbots by using an Acorn controller.
- Wed Mar 27, 2024 1:53 pm
- Forum: Centroid Acorn CNC Controller
- Topic: Need a small motor for lathe spindle
- Replies: 2
- Views: 1735
Re: Need a small motor for lathe spindle
I've used Teknic's ASU-FR510 unit to control an MCPV motor from 0-10VDC. The ASU-FR510 costs about $60.
- Thu Feb 08, 2024 7:54 am
- Forum: Centroid Acorn CNC Controller
- Topic: Proximity Sensor issue, never trips? < solved, used NPN>
- Replies: 8
- Views: 914
Re: Proximity Sensor issue, never trips? < solved, used NPN>
Maybe if I drawn the circuit as a generic snubber, you'll see that the diode is not shorted. In the circuit, current passes through the resistor, through the coil, and then through the NPN transistor. The diode suppresses induced current when the transistor is turned off by shunting that current bac...
- Wed Feb 07, 2024 4:54 pm
- Forum: Centroid Acorn CNC Controller
- Topic: Proximity Sensor issue, never trips? < solved, used NPN>
- Replies: 8
- Views: 914
Re: Proximity Sensor issue, never trips? < solved, used NPN>
KB58, no offense taken. However, did you notice that the In4148 is reversed biased, which is the correct orientation for its use as a shunt to protect an Acorn Input. The Acorn input is basically an opto-coupler. The Anode of the opto-coupler is connected to +24VDC internally. The Cathode of the opt...
- Mon Feb 05, 2024 9:52 am
- Forum: Centroid Acorn CNC Controller
- Topic: Proximity Sensor issue, never trips? < solved, used NPN>
- Replies: 8
- Views: 914
Re: Proximity Sensor issue, never trips?
Mistakes happen. Years ago, I bought some PNP prox. sensors instead of NPN sensors. That was before parts were available in two days on the Internet. I wasn't uncommon to have to wait for weeks for parts to arrive, unless you were willing to pay expense rush fees. Instead of spending $100 for three ...
- Sun Jan 14, 2024 7:22 pm
- Forum: Centroid Acorn CNC Controller
- Topic: Leakage Circuit Breaker Question
- Replies: 5
- Views: 866
Re: Leakage Circuit Breaker Question
Google Earth-leakage circuit breaker. By definition, they are not exactly the same as a GFI breaker. A Wikipedia article described two types, ELCB (voltage) and RCCB (current). Since you're the designer/engineer on your project, you can do anything that you want; but, if I were using your components...
- Sun Dec 24, 2023 12:25 pm
- Forum: Centroid Acorn CNC Controller
- Topic: In over my head - New CNC Router rebuild.
- Replies: 46
- Views: 17810
Re: In over my head - New CNC Router rebuild.
One of my favorite physicists is Richard Feynman because he explained complex things simply. His goal was to convey knowledge so that whoever was listening would understand both the problem and the solution. With Feynman's approach in mind, connecting a stepper motor driver to the acorn is simple. 1...
- Tue Aug 08, 2023 6:03 pm
- Forum: Centroid Acorn CNC Controller
- Topic: HomeAll Tripped on board without tripping switches
- Replies: 3
- Views: 470
Re: HomeAll Tripped on board without tripping switches
You stated that the LED is GREEN. Wouldn't that indicate NOT tripped? RED would indicate tripped. Noise can cause a false signal. You can reduce noise by adding a resistor to the input. You could use a 1/2W 4,700 ohm resistor. Connect one end of the resistor to 24VDC. Connect the other end to the IN...
- Mon Jul 24, 2023 7:29 am
- Forum: Centroid Acorn CNC Controller
- Topic: Mist coolant wiring 24vdc
- Replies: 13
- Views: 1372
Re: Mist coolant wiring 24vdc
Here's a simple schematic that might help. L1 is the solenoid. D1 is a diode (1N4002 - 1N4007). SW1 is the relay module on the relay board. When the relay is turned ON, power flows through the solenoid. When the relay is turned OFF, induced voltage (surge) is shunted back through the diode to the po...