What do you really get for a $350 desk top engraver ?

well i have my first real issue with this build. the X axis stepper tapped out on me today. to be fair i was giving it a workout as usual
the funny part is i made a video and got thought the first one fine but only made it halfway through the next one

I'm pretty sure i stripped something out on the internal parts of the motor which is a first for me. i guess if you mess around with this stuff long enough you run into just about everything

Thats unusual. Usually, they overheat and loose steps if you push them too far and eventually stop. There isn't anything to strip really. But the temperature could exceed the safe limit and melt the insulation in the windings. What happens if you swap stepper drives?

There is something to be said for using quality motors. Try Moons Industries who you are in US. 

 

it did seem odd to me too but i did a quick search on google on mechanical failures with steppers and it said gears stripping? i never tore one apart before but i might on this one just to see the inside. when you spin it by hand it feels wrong. usually, you can feel the 1.8-degree full steps.it turns under power but it has no torque.

i got a bigger one this time of the same brand because i can have it later today. my x was a bit under powered, so this is reason to bump up a little since i can get a 3 Nm with the same frame and shaft size.

machinedude wrote:

 my x was a bit under powered, so this is reason to bump up a little since i can get a 3 Nm with the same frame and shaft size.

Great to see adoption of real engineering units in an imperial world! 

the end of the shaft snaped off. i just pulled it apart to see what i could find. that's pretty odd

Makes me wonder if this could have been my source of the surface finish issues i was chasing around before? to me it always seemed to be coming from this axis. it's almost looking like a material defect in the shaft material? it's hard to say for sure but i will keep an eye on my finishes to see if that gets better after a motor swap.

the shaft twisted off right behind the bearing. the whole thing came apart in two pieces with the end of the shaft and bearing in the end cap of the motor. no crashes so it seems odd on a 2 Nm motor i would guess it would stall before something this drastic would happen taking a guess.

 

I said it was unusual. It had to be a flaw as you can stall a motor that size with your hand! First I've seen like that..

when i first built the machine my finishes looked like they were almost perfect and as time went on it settled into something i noticed and I messed around with for a while.

then i got sidetracked when i started thinking plasma machine and am just now coming back to deal with it

new motor is here already and am now working on getting that put on. i just thought it was interesting since i never seen this happen before. hopefully the new motor fixes everything. unplanned upgrade at this point

huge difference with surface finish with a less than perfect tool path and part for a machine this size.

Machinedude does his happy dance