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hello again :)

sorry i was offline for such a long time, I had to make a couple of changes to my workshop and actually get some work done so i put aside the troubleshooting for a while.

So in...

yeah ! ;)

very cool guitars, love the dragonfly design ... and the multiscale archtop looks interesting as well. i'm starting my first build soon, have bought all the ingredients and design is...

euhm ... in other related news: i broke the new stepper (chair)

the transmission wheel for the belt that goes on the stepper shaft was not holding properly (hence the NEW lost steps) but it would...

would love to see some finished guitars :)

so i did some more tests with the shielded cable .. and to my surprise the issue has changed, i am now loosing steps going down as well .. when i do a 'Ref all' and then a 'go to 0' i get a different...

indeed i didn't understand what you meant .. will try out a dwell after retract as well


but i think there is light at the end of the tunnel .. it seems to be the cable ... i tried with the...

Step Pulse=15
Dir Pulse=15
Velocity/Acceleration= tried every possible and imaginable setting, from optimal, reasonable, crazy slow, crazy fast and everything inbetween

I normally set my rapid...

but i do ! i can hear the lost steps happening during the retract move (see video) .. it sounds like stuttering or binding, that's why i thought it was mechanical at first but we've ruled that out...

the CPU in question is a Pentium 4 with 3GHz and i have 4GB of RAM, everything is running of a pretty fast SSD. The Gcode for each object in between retracts is around 3 thousand lines and i have a...

Hello,

i am trying to find the right end mill for cutting soft foam sheets. I'm not sure what the exact material is, in Germany different variants of this material go under the name of...

1) yes correct except that the problem is with the z-retract of 'one type of toolpath', the parallel finishing of several objects, it's on the retract before the spindle is moving to the next object...

to be honest i wanted only to connect the Z-Axis this way since it's extremely tedious to get to the other motors and i only have missed steps on the Z-Axis. For all these tests i had disabled the XY...

ok cool .. got it ... the motors BTW have 2 Ohms resistance not 20

so i went shopping in the local electronics store and lucky as i am they didn't really have what i needed. They only had 5 wire...

hey Pete, thank you so much for taking the time to educate me !!!
all this theory got me a little confused now ... i'm still struggling to understand what kind of resistor i should use.

if i...

thx for this advice, now that my connections are on clip connectors this will be easy to test.

the way i understand it, since the problem remained after switching the cables to different drivers,...

hey, thx so much for the detailed explanations .. and with all this talk about probing i finally understood the deeper meaning of your forum alias :p

so .. sorry to be so thick about this ... my...

still not progressed much ...

good news is i bought a new stepper motor and managed to connect it so it works (wasn't easy since i didn't have the pinout of the old motor so i had to determine...

it's a Gravograph machine, there is no owners manual, the machine is discontinued since the mid 90s, i contacted the manufacturers and they don't have or don't want to give out the manual.

i...

hello,

i apologise in advance if this seems like a stupid beginners question but i'm not an engineer and am trying to service an industrial machine for the first time :rolleyes:

the machine in...

yes that's what i did and it's still losing steps

BTW here are some detailed pictures of the machine: https://picasaweb.google.com/114245367403721121805/August14201402?authuser=0&feat=directlink
...

great video indeed !!!

so i did what he suggests, first disabled XY axis - still losing steps
increased the pulse width to 15 for both step/dir - still loosing steps
tried sherline mode - still...

sorry english is not my native language .. what do you mean by 'binding' ?

i'm already doing all the tests with the spindle off

so .. the plot thickens .. once again :(

i did as you suggested and swapped the cables for Z and Y ... unfortunately the problem persists

as for Gravograph, i contacted the european...

yes the line in the driver test is completely flat, one or two tiny spikes when it takes over but then totally flat ... i have been running for years at 25k kernel speed .. i just tested the other...

hello,

it's been several weeks now that i'm trying to solve this problem:

When i'm doing 3d finishing passes (Parallel Finishing from Rhinocam) at the moment when the Z axis retracts after...