Hey Steve, did you ever find an answer to this problem? I've noticed the same thing.by cncjoe - Canada, Toronto RepRap User Group
I wonder if you could use a tube with straight splines in it in between the nuts to counteract the torque differences without adding too much friction...or one of those sharp disks from one of those hand-operated can openers?by cncjoe - Mechanics
Awesome idea DD. A while back I asked the best lathe machinist I know if he could cut a multi start thread in the size needed for 3mm filament and he was skeptical. I also looked for one that could be bought off the shelf. They don't seem to exist unfortunately. Seems like regular 6-32's seem to work great for the extrusion but is the retract fast enough? I bet multi lead nuts could be printed inby cncjoe - Mechanics
Quotecncjoe Lastly, I went to pins.h in Marlin and changed the definition for TEMP_0_PIN from 13 to 11 although I bet since 13 is also analog, I could have just plugged my TC into it and not have had to change the pin definition. I think I'm wrong on using pin 13 for the thermocouple. I'm not sure but I think the AD8496 chip might physically be on the shield therefore TC1 (pin 11) and TC2 (pin ?)by cncjoe - Firmware - experimental, borrowed, and future
Here's how I did it if you would care to know. I have the version 1.1 shield and on it are terminal blocks (I'm not sure what shield you said you have). Anyway, the terminal I hooked my thermocouple up to is TC1 and on the X3 main board it connects to analog pin 11 which is pin 2 of the EXP2 header. In Marlin I set #define TEMP_SENSOR_0 to -1 (for thermocouple with AD595) in the configuration.hby cncjoe - Firmware - experimental, borrowed, and future
Was that the 9.10b version?by cncjoe - Slic3r
I'll shut up now and let the slic3r guys help you.by cncjoe - Slic3r
I've noticed the same thing on MY prints Duckey. I'd like to see any replies to your question. Also, I've noticed on this forum that if you type the name nophead in a post, a knowledgeable guy (named nophead) magically appears and may help you!by cncjoe - Slic3r
What machine is it? Also, can you take a picture of the part you printed from the top. From what I see in the pic you posted, it looks like layer shift, but only in one axis. I assume you leveled your bed and calibrated your X, Y, Z, and E? I'm asking because I've never seen slic3r do this. It really seems to me to be a mechanical issue. Maybe a loose pulley on one of those axis? I'm guessing youby cncjoe - Slic3r
Just curious. Under the printer settings tab, extruder 1, in the retraction field, do you have 'extra length on restart' set to anything other than zero?by cncjoe - Slic3r
And the hashmark (number sign) might not be the right character to disclude the comments from the gcode. Mine always uses a semicolon. Just my 2 cents.by cncjoe - Slic3r
I've actually tried something like this for the heated bed http://forums.reprap.org/msg-191972. It worked but it was a hack and it made some LEDs stay on when they're not supposed to. I've since implemented the use of solid state relays for THAT purpose. In that case the hack was using a mosfet on the ramps board to switch the ground of a 12V supply on and off. It obviously influenced the electroby cncjoe - Controllers
Would it only be a problem if logic ground and motor ground are connected in the driver? Guess I'd have to find that out huh?by cncjoe - Controllers
I'm using an Azteeg X3 right now running on 24V but I'd like to use 36V for the stepper drivers. Also, when all 3 axis move at the same time they seem to be bogged down. Thanks for your reply.by cncjoe - Controllers
Hey, does anyone know if stepper drivers (these in particular) need to be powered by the controller or can Vmot and ground come directly from a power supply? Thanks! joeby cncjoe - Controllers
Hey! Aren't you supposed to be sleeping Red?! (Just kidding) What I'm saying is when I had those Wanti motors wired up, I couldn't get the motors to turn with the Vref set higher than .25V. Funny, Qu-bd states that they can run 2 of those motors on one drv8825 driver but I can't even get one to run.by cncjoe - RAMPS Electronics
Oops. Yes. .5V not .5ohms. My eyes don't even work at 3AM! You obviously have a better understanding of electronics than I do. There is a diagram here for the pololu drivers I use. It looks like there is a 10k resistor on the Vref?? QuoteRedreprap see its heat dissipation before turning it down It won't even turn at higher Vref. It just hums. Makes me think there is something else wrong but what?by cncjoe - RAMPS Electronics
I think you guys are awake when I am sleeping. Some awesome suggestions! I'm using the Marlin firmware if that's what you meant Red. As far as Vmot, I've tried 12V, 24V, and 36V (36V only on the Ramps). I've found that I get the best results with the 24V though. I've tried full step, half step, eighth step, sixteenth step, and thirty-second step. I'll have to do them again and document the resulby cncjoe - RAMPS Electronics
So what do you make of this if you don't mind. I have THIS CONTROLLER with THESE DRIVERS trying to run THESE STEPPERS. I can't get them to run throughout the speed range I'm shooting for. Using the same controller, THESE DRIVERS, and THESE MOTORS I've had much better results.by cncjoe - RAMPS Electronics
Limited knowledge? Your name is ALL OVER this forum...by cncjoe - RAMPS Electronics
Quotefor newbies who do not know the exact science, this will present many hours of tinkering and pondering about the source of strange problems (like steppers going up in smoke? having a nice burn on the fingers?) That's me! Thanks for the reply Red. Yes. All metal. I suppose if I were a carpenter it would be all wood! I've abandoned the Ramps board and taken on the headaches that come with theby cncjoe - RAMPS Electronics
Of what consequence is a 'huge current ripple'? Isn't there some kind of sacrifice when you give up slow decay? I could look it up but I want to reply quickly to keep you talking to me. :-)by cncjoe - RAMPS Electronics
Just wondering if anyone knows of any implimentations of closed loop systems running a flavor of Marlin? I've read a lot about people being able to hook an arduino up to a linear encoder and get feedback with a simple sketch but I've not seen any implimentation in a working CNC. I can't even guess what the firmware would do with such information or what part of the firmware the code would be addeby cncjoe - Firmware - experimental, borrowed, and future
I'm just subscribing to this topic for the answers you get. Good luck! joeby cncjoe - General
That's what I was hoping but I didn't know if there was anything else to consider. Off hand, do you know if these pins are hardware or software?by cncjoe - RAMPS Electronics
I now have a problem like the wiiggly motor problem thread by Baustard. My problem is with the extruder drive (E0). I've moved the carrier and extruder motor from E0 to Z and it works fine. I've moved the Z motor and carrier from Z to E0 and the motor indexes in seemingly random directions but never more than a few degrees. The only thing I haven't tried is moving the carrier and motor to E1 andby cncjoe - RAMPS Electronics
So, looking at your data sheet and the reprap wiki here reprap wiki you apparently need to leave pins 5 and 2 disconnected, pair A is pins 4 and 6, and pair B is pins 3 and 1 as far as I can tell. That would be MY first guess anyhow. Are the pins numbered on the connector of the motor? The diagram on the data sheet shows the pins being from right to left 1 through 6 when the shaft is facing you.by cncjoe - RAMPS Electronics
Polygonhell Wrote: ------------------------------------------------------- > There are many things that limit speeds. QuoteIt looks like you are using screws to drive the axis, what's the pitch? I'm using a 2.75:1 belt pulley reduction AND 3/8-10 acme screws. Yeah. The steps per mm is set at ~2564 for the Y so that's roughly 43000 steps/second if I want to go 17 mm/second. Right? What ARM boaby cncjoe - RAMPS Electronics
Yup. My caps are 35 volt, I replaced the fuses with inline ones at the + of the power supplies and I did the FET hack successfully like you said on another thread Cefair. Thanks for your help! I'm kinda disappointed with the performance of the steppers though. I read that bipolar will give more torque with less speed and unipolar faster rapids at less torque so I was wondering what the weakest liby cncjoe - RAMPS Electronics
If you don't mind my asking, what in your opinion is the weakest link in a system running marlin firmware, ramps 1.4 with drv8825 drivers on 36 volts and these kelinginc steppers wired bipolar series?by cncjoe - RAMPS Electronics