PeterE builds a 3d Printer

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chipenter:
I have two diferent types of stepper motor , two are slitly longer than the outher three and I have to adjust the tiny pot on the driver board for each type outherwize it jitters , I also have to slow the feed rate for the longer ones but are more powerfull .

PeterE:
Thanks for the info chipenter!

My motors are all of the same type.

The X axis one sounds and works like I expect a stepper to do. The same goes for the two Z axis motors who also work nicely toghether as expected.

The Y axis motor growls instead of humms so maybe I have to adjust the stepper controller with the pot a bit. Must check that. It may be that it has not enough power, but it has difficulties to run the whole length of the "track". Instead it goes a bit, stops and returns a biot, stops and gopes a bit etc, etc. All while growling and protesting as I see it. Could it be a cabling issue????

The extruder does not move at all - yet. Must check that pot as well.

So three out of five motors behave, and two misbehave and then differently.

The most odd thing is the odd behaviour of the Y axis motor and that puzzles me.

/Peter

chipenter:
I adjust the pot with the motor running for smoothenes and power , only takes a small adjustment and you can hear the difference .

picclock:
Hi PeterE

The extruder motor is software trapped, so it will not work until head temperature high ~ 160C I think.

If you remove motor you can easily see how hard it is to move Y axis, and fix if required. You can also operate motor and check rotation and torque while it is removed. If you think it is driver just swap out board for extruder driver and retest. It may just be bad connections between motor and driver (I have had this when a Z connector almost pulled out - and it resulted in motors turning in opposite directions sometimes), or it may be that the ratio jumpers set under the driver board are not correct. If you are using the software I posted I hope you altered the steps/mm figures as I am using /32 for all motors except the Z motors which are /4 (hence 1000 steps/mm with 0.8mm pitch M5).

>>Building a machine like a 3D printer feels just like a hurdles race, a number of obstacles to pass on the way.

For me also. So many things that are not well explained, with solutions to be found, like the heat bed nonsense, rafts, bed adhesion etc. Each step a little more knowledge, but so much easier if known in advance.

Happy Easter PeterE

Best Regards

picclock

PeterE:
@Chipenter,

Thanks for the tip. Will look at that, but before that I will make myself a quickie non-metal small screwdriver for that particular purpose. I don't want to risk anything being shorted while trimming. Will get back on that.

@Picclock,
Hmmm, OK good to know that there is a dependency lock between extruder motor and heater, but it should be possible to make test runs without using the heater. My informant writes:

"In Pronterface, below the "extrude" button, type in "100" mm, then hit "extrude". Measure how much filament comes out. If it's exactly 100mm, you're done."

Regarding the Y axis movement it is just as smooth as the X axis so I think there is an issue of some sort with either the driver or the cabling. Swapping drivers is a good way to find that out, will try.

Then, Yes, I am changing the values, but before finalizing the settings I want the movements to operate properly. Currently I don't mind slow running, that is safer than if they run fast.

To get over the obstacles I try to write everything down along the way. Sort of creating an info volume at the end. Since taking a lot of pictures on the build and writing steps here, I actually have a lot of it already. I also think it is immensly valuable to be able to discuss and juggle ideas on a forum like this. The maddest ideas are properly chucked out in favor of the more sane ones.

And, Yes, I had a very nice and Happy Easter holiday, hope you had the same!

BR

/Peter

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