Search found 32 matches

by unicornswag
Sun May 18, 2014 8:27 pm
Forum: Electronics
Topic: gShield for NEMA 23's?
Replies: 12
Views: 2411

Re: gShield for NEMA 23's?

Well, the gshield is only rated for 2.5 amps per channel, so you'd be a far above that with dual motors. This is definitely a job for some beefy standalone drivers.
by unicornswag
Sun May 11, 2014 3:36 pm
Forum: Electronics
Topic: Hard limit switches triggering with spindle?
Replies: 5
Views: 1235

Re: Hard limit switches triggering with spindle?

Actually, you probably do have some ferrite beads handy, but just don't realize it. Most USB, serial or parallel cables have one in a plastic jacket at one end. So if you have an old, unneeded cable around, you could recycle the bead from that. Otherwise, almost all consumer electronics such as DVD ...
by unicornswag
Tue May 06, 2014 4:28 pm
Forum: Electronics
Topic: E-Stop gShield and Spindle relay
Replies: 9
Views: 1993

Re: E-Stop gShield and Spindle relay

Okay, so that relay module does only require a small current to trigger. However, the relays themselves draw 85 milliamps at 5 volts according to their datasheet, so the module uses a transistor and possibly an optoisolator to actually power each of the coils. So I would assume that the board requir...
by unicornswag
Sat May 03, 2014 6:00 pm
Forum: Electronics
Topic: y-axis motors turn in opposite direction
Replies: 2
Views: 560

Re: y-axis motors turn in opposite direction

Not sure why this would be happening, but just reverse the sequence of the cables coming off the Y driver terminals. Problem solved.
by unicornswag
Sat May 03, 2014 3:31 pm
Forum: Electronics
Topic: E-Stop gShield and Spindle relay
Replies: 9
Views: 1993

Re: E-Stop gShield and Spindle relay

You could really use just about any transistor or mosfet to activate the relay from an external supply. A ULN2003 is actually 7 transistors in a single chip with resistors and diodes built on on the base pins, so you can safely wire it straight to the arduino. Of course, the remaining 6 channels wou...
by unicornswag
Sat May 03, 2014 2:40 am
Forum: Electronics
Topic: E-Stop gShield and Spindle relay
Replies: 9
Views: 1993

Re: E-Stop gShield and Spindle relay

Okay, so we're talking about two issues here. As for the E-stop, I'd go with what I said above. Of course, the arduino would still be powered by the PC, but that should be irrelevant. As for the relay on the spindle, I have one suggestion: power the relay coil from an external supply, not your Ardui...
by unicornswag
Sat May 03, 2014 2:17 am
Forum: Software - CAD, CAM, Workflow Help
Topic: Can I disable steppers in UGS
Replies: 5
Views: 993

Re: Can I disable steppers in UGS

Well, there is no G-code command (that I know of) that can accomplish this, therefore grbl doesn't support it, therefore UGS has no way of handling it.

Sorry.
by unicornswag
Sat May 03, 2014 2:07 am
Forum: Electronics
Topic: E-Stop gShield and Spindle relay
Replies: 9
Views: 1993

Re: E-Stop gShield and Spindle relay

Not entirely sure what you're trying to accomplish here. Do you want everything including the arduino to lose power when the e,stop is pressed? Since that e-stop button has a normally open and a normally closed set of terminals and is locking, I would simply run mains power between the normally clos...
by unicornswag
Thu May 01, 2014 3:42 pm
Forum: Electronics
Topic: Power Supply Chirping Noise?
Replies: 3
Views: 1124

Re: Power Supply Chirping Noise?

Try connecting a dummy load to your PSU, maybe 10 ohms or so across the 12 volt rail with the stepper drivers disconnected. If all is well, you could probably narrow the issue down to your electronics outside the PSU.
by unicornswag
Thu May 01, 2014 3:37 pm
Forum: Discussion
Topic: New CnC mill on Kickstarter...
Replies: 18
Views: 3189

Re: New CnC mill on Kickstarter...

Right now I'm looking for a slow but powerfull motor. Something between 100 and 3000 RPM maybe and a good torque (I'm not sure how to quantify it)... I was wondering if it is possible to achieve that with this kind of motor, but I highly doubt it. A BLDC motor with with an ESC is capable of running...