Re: Nema 34 steppers with DQ860MA on Ramps 1.4 DIR pin issue
I'd check wether endstops still work. Marlin has this nasty habit to move away from triggered endstops only and also the habit to avoid negative coordinates.
View ArticleRe: Nema 34 steppers with DQ860MA on Ramps 1.4 DIR pin issue
I just checked the endstops and they seem to be working just fine. i have mine set up to be normally open. measuring from the leads at the Ramps side i have no continuity unless the switch is pressed...
View ArticleRe: Nema 34 steppers with DQ860MA on Ramps 1.4 DIR pin issue
I will be putting 1k ohms resistors in series between the Ramps signal pins and the DQ860MA tonight. I'm also going to replace the suspected "burnt" optoisolator FairChild HCPL2531 with some scavenged...
View ArticleRe: Firmware to drive X-Y galvanometer
hello, vicktor. I'm having serious problem of my sla printer hardware. I tried to use the galvo head at my previous post, but it's too expensive. well, so i don't have what servos, mirrors, and how...
View ArticleDriving a DC PCB heated bed with AC mains?
Hello, I'm in the early stages of desiging my own kossel-style printer. I would like to drive the heated bed with mains voltage in order to reduce the power requirement on the power supply. Even if...
View ArticleRe: Driving a DC PCB heated bed with AC mains?
Even with PWM you have to design for full on conditions so 1.2 ohm, with 240vac so thats 171 amps! Its never going to work, your just going to have lots of instantaneous copper evaporating and fire!
View ArticleRe: Driving a DC PCB heated bed with AC mains?
In the long run, you would probably be much better off looking on YouTube at how Werner Berry made the mains-powered heated bed on the BerryBot and duplicating that. I believe that there are a few...
View ArticleRe: Firmware to drive X-Y galvanometer
... look here - this are common galvos with drivers for show-laser applications, but the smaller/cheaper systems could be good enough for scanning UV-lasers too: [www.mylaserpage.de]
View ArticleRe: Driving a DC PCB heated bed with AC mains?
QuoteLeavSo, the basic idea is to order a board like this, and power with mains voltage. BUT! since just connecting it to mains will certainly fry it within a second or two, the idea is to use a solid...
View ArticleRe: Driving a DC PCB heated bed with AC mains?
He has got me wondering about some some sort of sine wave following pulsed power supply though that grabs voltage from 0 - 15v and 0 -15v part of the cycle for use. It wouldn’t need to be continuous.....
View ArticleMotors do little steps, not big ones.
Hi there, I'm building an i3, it's mostly complete. Electronics are Mega 2560 + ramps 1.4 running marlin. FYI I bought it all as a kit from these people via Amazon. It's been a mixed bag so far, but...
View ArticleRe: Motors do little steps, not big ones.
Your max feed rate is probbly to high. once they get out of the accleration curve phase the steppers are trying to move to fast try a contolled move eg G1 X10 f300, ie move to X10 at feedrate 300....
View ArticleRe: Driving a DC PCB heated bed with AC mains?
QuoteDustHe has got me wondering about some some sort of sine wave following pulsed power supply though AC solid state relay typically switch when voltage crosses the zero line. There are...
View ArticleRe: Motors do little steps, not big ones.
Also, acceleration is set too high per default in most firmwares. 9000 mm/s2 is ridiculous, 1000 mm/s2 is much closer to what typical printers can achieve.
View ArticleRe: Driving a DC PCB heated bed with AC mains?
You missed the central point... generating ~24v ac from the mains by extracting the first and last part of the sin wave. ie a type of power supply. I am not advocating putting the HBP anywhere near...
View ArticleRe: Motors do little steps, not big ones.
Thank you both, I will try that this evening and report back :)
View ArticleRe: Driving a DC PCB heated bed with AC mains?
If you're going to cut down the mains 240VAC down to 24VAC, you may as well just use a toroid transformer suited to the job (with a 10:1 winding ratio) to do it and avoid all this really unnecessary...
View ArticleNo voltage from heater terminal to extruder on Gen6 board
I got a Gen6 board on my Airwolf 5.5 and I've been having a problem with the extruder staying at temperature. Eventually, it wouldn't heat at all and it would randomly start heating again. Checked the...
View ArticleRe: Driving a DC PCB heated bed with AC mains?
This is a very frequent question, and very interesting subject to think about. If we have a current flow of y amps and 20 volts, there is no known method to coniniously just let 10 volts through while...
View ArticleRe: Where to get female board moun versions of molex 4-pin connector...
Quoteburning_chipsThese are all male connectors. I need the female side, preferrably as right-angle parts.I don't think that you'll find them for "safety" reasons. Much like suicide extension cords...
View Article