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

Well i had some time to test cutting an arc toothed pully. I was not even sure if i could or not with a 5/8 depth on this profile. i ended up buying a special extended reach 1/16 diameter end mill to try. it does work but it is not the fastest process for sure i was not pushing anything very hard at all with the cost of this endmill being around $55 with tax and delivery. the bad news is i messed up with my model and offset my geometry in the wrong direction so this piece i made is no good, but the process works for sure.

 

It took me 3 attempts, but the 3rd time was a charm It would appear to me there is a fine line between getting just enough clearance and matching the belt profile exactly. too much clearance and you end up with backlash i would guess. but i think i have a close fit or at least as close as i can get and still have things work as they should.

 

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! image missing /media/kunena/emoticons/w00t.png