Hmmm. Have you tried the drv8825 at all? Thanks for replying by the way.by cncjoe - RAMPS Electronics
You know past life, I got mine going last night. Just moving, not printing yet but one difference between yours and mine is I'm using nema 23 motors for x, y, and z and a nema 17 like yours for the extruder. Interestingly, the extruder is doing what you describe on yours. It just buzzes and moves a little no matter how much I fiddle with the driver. I'm going to try taking micro stepping down allby cncjoe - RAMPS Electronics
Here's one of the places I started at Ultimaker wikiby cncjoe - RAMPS Electronics
No takers on this one huh? That tells me the information is probably out there somewhere and I've just got to find it. The reason I'm asking is because I'm going to use Pololu stepper drivers on my ramps (instead of the A4988's it came with) and the documentation says the A4988's can handle step pulse durations as low as 1 micro second but the drv8825's need at least 1.9 us. I'm wondering if pulsby cncjoe - RAMPS Electronics
I didn't get my reprap fix tonight ): but tomorrow night is looking promising. Did you do anything with the baud rate? Also, do you have an lcd interface or just the usb to the computer? I was thinking if you have the lcd, you could get the motors going regardless of the connection problem to pronterface...by cncjoe - RAMPS Electronics
Anybody know what the high/low step pulse duration is on a ramps 1.4 board?by cncjoe - RAMPS Electronics
Nice. I didn't know McMaster had those. Looks like they come with the wires already attached? I would guess they used the proper gauge wire for the power they're rated for.by cncjoe - RAMPS Electronics
I'm using pronterface with a ramps 1.4 board too. I had to set the baud rate at 250,000 (you wrote 25,000) in marlin AND pronterface. I had to turn off PID for my heated bed (use full power here:#define MAX_BED_POWER 256 // limits duty cycle to bed; 256=full current-was 128 3-17-2013) because the PWM was causing ramps to lose connection with pronterface. I know you said you don't have the bed hooby cncjoe - RAMPS Electronics
Thanks for the advice bud. Happy printing!by cncjoe - Printing
I just cut one leg of the diode and bent it away a little. I didn't desolder it...by cncjoe - RAMPS Electronics
I hooked up the 12v to the 11A connection and the 24v to the 5A connection then tested the heated bed. The led on the ramps and the led on the bed blink and when they blink the lcd pulses and pronterface stops communicating with the ramps. Any ideas? Thanks ! joeby cncjoe - RAMPS Electronics
This is what I have the end stop stuff set to. I assumed that since I'm sending the axis to the furthest negative travel limit for their home positions, that would be zero or MIN_POS(ITION) because I don't want to extrude or machine using negative coordinates. My experience with the Cartesian plane is y+ is away from me looking at the front of the machine. X+ is to my right, and z+ is like a treeby cncjoe - RAMPS Electronics
Thanks AK. I'll check that out. I like your blog, by the way. Thanks Stephen. So, ideally 'just don't miss steps' but can't that be reconfigured just in case? Actually, feedback would be ideal; like linear scales but that's down the line. I need to do that Cefiar Mosfet hack. Can I just tie the 12V and 36V ground of the power supplies together? The caps on my ramps shield are 35V. I know whatby cncjoe - RAMPS Electronics
How do you make a common ground between a 12 volt and 24 volt PSU? Is it as simple as tying the two together?by cncjoe - RAMPS Electronics
New video So here's my machine moving at 1200 mm/min. after changing the y driver to full step and the x to eighth step. I set up end stops for the x and y and they work for homing but as I ran a test program, the y was stalling and it eventually crunched the switch. Anybody have any idea why it would work as a homing switch but not a limit switch? Thanks! joeby cncjoe - RAMPS Electronics
Yeah. I'm not a big fan of Panucatt. I don't have nice things to say about that company. Thanks for the input Akhlut. It's encouraging to read that someone else has been successful with what I want to do. I googled and searched many places to find info on this stuff but never quite found a match. You guys are awesome though. I was worried that I'd piss off the knowledgeable guys by asking the samby cncjoe - RAMPS Electronics
Thanks so much for your attention Cefair. If I may ask further… QuoteCefiar also try going to 1/8 or 1/4 feed rates if you're using lead screws Do you mean feed rates or micro stepping? I did, in fact, have to reduce the default feed rates in Slic3r from 60 mm/sec. to 14 in order to keep from missing steps and such. I'm pretty sure you mean quarter stepping or eighth stepping because that's theby cncjoe - RAMPS Electronics
Does it sound like a tune or a buzz? I'm just wondering because I was under the impression that PID uses pulse width modulation which would have a specific frequency like a stepper motor at a specific feed rate.by cncjoe - RAMPS Electronics
* RAMPS 1.4 from Gadgets3D * G3D A4988 drivers or * Pololu DRV8825 drivers * MK2A PCB heat bed * Marlin_V1 firmware * Nema 23 stepper motors wired bipolar series * 12V 500W ATX power supply or * 24V-400W switching power supply. * G3D Buda style hot end w/ 12 (24?) Volt cartridge heater * Latest version of Slic3r as of March, 2013 (pre-compiled for Windows) * Latest version of Pronterface as of Maby cncjoe - RAMPS Electronics
Interesting. I'm glad I saw this. That hot end is the same one I have (I think) from G3d? Do you have a cooling fan blowing on it? I haven't extruded with mine yet but my first impression was that the heatsink looked pretty cheesy. I actually cut 'veins' in mine with a hacksaw in order to allow more cooling air to circulate. I wonder what other people will say about this. Good luck. joeby cncjoe - Printing
That is a great idea! I'm very interested in this however I don't have much to contribute except for a machinist's perspective. Do you have any links to info on this 'printable rubber'? Hope this thread grows! I'm going to follow along. joeby cncjoe - General
I'm far from being an expert but to me it sounds like you may have your maxtemp set wrong in your firmware. This code posted here is part of my configuration.h file from my Marlin firmware. It seems to me that you may have it set somehow as your mintemp maybe? I got that same error you did only when I didn't have a thermistor plugged in and the error was mintemp, not maxtemp. This is one thing Iby cncjoe - General