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Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Problem, Problem, Problem !
Ive been electrocuted by my machine. I was making the "small 20mm calibration box", and got it to pop off the table, then it slid to the floor of the work space. the floor of the work space is a normal user accessible surface. one or more screws gave me a jolt, made me weak in the knees, at which point i went to the cement floor, in some pain.
Having measured it with a witness, (lest i stop breathing) it appears to be 85 VAC on at least 3 screws.
a consumer product shouldn't be allowed to do this as per UL and other regulations. I dont know if only mine is defective, or if this is a production problem. The screws run to and hold in the SMPS, but im not sure what they attach to, and want to leave it the way it is, so flashforge can investigate their prodcut.
ill report this to flash forge tonight and see what they say.
Voltmeter between ground prong from a socket and the screw.
This inner volume is meant to have hands and tools in it, so it needs to meet all the safety standards of a consumer product.
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
Now that is definitely not right. I built mine from a kit so I know where all the wires are going. Your going to have to find out which wire is shorting. I guess you were making a partial ground with your body to the floor through your pants. A full grounding would have been worse not to mention this is a fire hazard.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
fire hazard, legal hazard, safety hazard...
my flip-flops werent good enough, which surprised me, literally! grounded from screw through upper organs to feet. Im not as young as i used to be, 85 VAC took me right out.
I still cant make files in Autocad and get them into replicator G. Im using this link at the moment, but the work flow is crippling me. Im starting to think its autocad thats the problem.
EDIT: ive found the problem, first i was expecting a 1 inch cylinder, when really it showed up as a 1mm cylinder. it was 6 yellow pixels, hence i couldnt see it, till reviewing the .stl file in a text editor.
next, its possible, (perhaps probable) flashforge doesnt realize its the SMPS maker who screwed up...
Registered Member #65
Joined: Thu Feb 09 2006, 06:43AM
Location:
Posts: 1155
First off, almost everyone gets different temperature settings that match their units extrusion rates and sensors. The above normal Head temperature on my unit may be device specific, and may require scaling the object up 4% (in slic3r) to compensate for cooling. I would recommend slowly increasing the movement velocity until problems occur (positioning error), and back it off by 20% . It is counter intuitive, but sometimes faster means better quality prints as there is less collateral heat-damage to the surfaces/edges.
The work flow we use: CAD -> STL -> Slic3r -> gcode -> Printrun
The work flow if you want the g-code file done more quickly: CAD -> STL -> Meshlab -> simplified STL surfaces -> Slic3r -> gcode -> Printrun
I've attached the Slic3r import config for small ABS objects using 0.4mm extruder and 0.25mm layer height. Note the machine specific g-code that auto-resets the printer at the start of a run.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Carbon Rod, so far, i think ive got it all in hand, i was once a CNC laser operator, so i know all about the need for upping this, tweeking that, lessing the other. these just need to be learned.
but its the electric shock thing that has me concerned...
edit: thanks for the file, ill look at slic3er, and the other settings.
what i also want to know is how to make thin vertical walls. i have a 0.4mm nozzle (0.15 in) but want 0.040 in thick walls, (1mm), but dont know if fill is 100% with 3 shells?
EDIT: it looks like with my 0.4mm nozzle, i can get a single shell of 0.5mm, at a vertical res of 0.2mm. im also thinking about making I beam like structures, but dont know when or how to use "raft" yet...
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
I use rafts when I'm using ABS and the object is more than 1cm above the heated bed. This helps hold the corners down so they don't warp as the top cools and contracts. This will pull the bottom off. I have my raft set to a 3mm perimeter.
Registered Member #509
Joined: Sat Feb 10 2007, 07:02AM
Location:
Posts: 329
The electric shock shouldnt happen, the whole thing runs off of 24 VDC from one beefy power supply. Double check the grounding to make sure its not just a bite from emi cap leakage. Either that or I'm mis-remembering and it runs off of 48V and you have a stepper motor with shorted insulation at one point and youre getting the push-pull drive from that.
If you start running into problems with it stopping mid print at seemingly random points, its probably EMI issues. Get a clamp on or slip on ferrite and put it on the ribbon cable. I can dig up a mouser part number if needed. I also went hog wild and re-wired it with continuous flex shielded cable for the steppers, but I dont think that was 100% needed.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
ConKbot of Doom wrote ...
The electric shock shouldnt happen, the whole thing runs off of 24 VDC from one beefy power supply. Double check the grounding to make sure its not just a bite from emi cap leakage. Either that or I'm mis-remembering and it runs off of 48V and you have a stepper motor with shorted insulation at one point and youre getting the push-pull drive from that.
If you start running into problems with it stopping mid print at seemingly random points, its probably EMI issues. Get a clamp on or slip on ferrite and put it on the ribbon cable. I can dig up a mouser part number if needed. I also went hog wild and re-wired it with continuous flex shielded cable for the steppers, but I dont think that was 100% needed.
but the screws run directly into the SMPS, and it really looks like its AC from the socket. It sure felt like more than just a stepper kickback.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
If it were me I would open this up and take a look. Assuming there aren't any warranty seals that would prove that you opened it.
You should be able to unscrew the SMPS and look in the screw holes to see if the screws have mashed into anything they shouldn't.
It will be an off-the-shelf SMPS from Mean Well or someone similar, so you can pull up the datasheet for it and there should be a maximum screw penetration quoted. It may even be embossed right into the casing. If the screws penetrate further than that then the makers are idiots and need to be sued quick.
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My Flash Forge Creator 3D Printer.
