If you do happen to get a Rambo 1.2 and have an older Max

[JohnStack]

Be sure to invert your steppers. I had the pleasure of having a "reaction test" this afternoon.

One of our friends has documented it well here:

http://forum.seemecnc.com/viewtopic.php ... per#p31109

Are you aware of any other changes that should be made? I'm now calibrating. Perhaps by the end of the week, dual extruders! Whee!

[Eaglezsoar]

I know that it happens, but no one has determined why the inversion of axis direction occurs during the firmware upgrade. I guess we just accept the fact that
it can happen and know what to do when it does happen.

[geneb]

If the invert wasn't bad enough, SeeMeCNC has gotten a few stepper motors with the connectors wired correctly, but the wiring is inverted INSIDE the stepper. I discovered that little misfeature when I powered up the v2 and homed it. Two towers went up, one went down. I had my finger on the power switch just in case, so nothing got chewed up. (and yes, that'll be covered in the manual!)

g.

[Eaglezsoar]

If the invert wasn't bad enough, SeeMeCNC has gotten a few stepper motors with the connectors wired correctly, but the wiring is inverted INSIDE the stepper. I discovered that little misfeature when I powered up the v2 and homed it. Two towers went up, one went down. I had my finger on the power switch just in case, so nothing got chewed up. (and yes, that'll be covered in the manual!)

g.

It's getting to the point where you can't trust anything made in a certain Country.

[JohnStack]

ok next at bad:

Extruder stepper motor is running in reverse. I can't print.

I tried Flateric's inverse suggestion. No worky. Ideas?

[Eaglezsoar]

ok next at bad:

Extruder stepper motor is running in reverse. I can't print.

I tried Flateric's inverse suggestion. No worky. Ideas?

John, what have you tried?

[JohnStack]

I tried the change in Configuration.h. That kept it going in reverse.

#define EXT0_INVERSE true

That didn't work.

So, I was stupid and simply tried reversing the stepper wires.

Now, no stepper movement - forward or reverse.

Does that mean blown board or blown stepper? Crap.

Signed,

Loves to blow things up.

[mhackney]

I doubt if you hurt the driver or stepper by wiring improperly. Sounds like you didn't do it right though. Did you return it to the original wiring sequence and try?

EXT0_INVERSE is guaranteed to work, I just tested it. So something is not right, you should try it again.

Also, are both your extruders going backwards or just one?

[Eaglezsoar]

Also if you short out a pair on the motor while it is out of the machine it will be difficult to turn. If you short a pair and it is not difficult to turn you have a bad stepper.
I would also try shorting the wires two at a time and see if any pairs make the motor hard to turn. The plug may be wired wrong. If you find any two pairs of wires that
make the motor hard to turn you have identified what the pairs are.

[JohnStack]

I have a cascade of challenges. First, I was able to pull voltage from the steppers by turning the motors on red/green and yellow/blue.

1. I reloaded eeprom. No extruder action. Everything else worked.
2. I had a second Rambo 1.2 board so I changed out boards. Then my display went out! At this point, I'm chortling to myself ("Is there anything else I can be doing that might be more entertaining right now?") I can control the printer from Repetier but I know it's the shorty jumper on the new boards.
3. I have an extra 1.2 board so I took the shorting thing out of the new board and switched them. No worky.

BTW, if you strip back the shorty jumper, this is what it looks like. I don't know what it is so I thought I would check for continuity. That didn't work....

I'm going back to the extra 1.1 I have, take the 1.2 boards to MRRF and bench test. I would love to print this week! LOL

Thanks for all of your help!!!

[Eaglezsoar]

John, that jumper is not actually a jumper and contains this part:
http://ca.mouser.com/Search/ProductDeta ... 0026D580DL

I'm not sure what a continuity test will show because I am not sure what the resistance value of the above part is.
I am glad you got your steppers stepping.

[JohnStack]

A variable resistor - so if you give it a specific voltage, it gives a specific resistance. Odd that it is used to handle shorts.

Anyway, after more isolation, it's a blown stepper. Dammit. Better than a board of course. Need to source one in the San Diego area. Fingers crossed. And there are none. Argh!!!

BTW, do not simply reverse the plug on E0 stepper!!!!

[Eaglezsoar]

A variable resistor - so if you give it a specific voltage, it gives a specific resistance. Odd that it is used to handle shorts.

Anyway, after more isolation, it's a blown stepper. Dammit. Better than a board of course. Need to source one in the San Diego area. Fingers crossed. And there are none. Argh!!!

BTW, do not simply reverse the plug on E0 stepper!!!!

Sorry to hear you had a bad stepper after all.
The varister quickly changes it resistance to an input voltage so if a high voltage spike hits it, the resistance increases fast enough to prevent the spike from propagating to the
rest of the board. Could you have missed a source for a stepper in a city as large as San Diego?

[JohnStack]

Believe it or not, regardless of its size, San Diego is not all that when it comes to parts. There is Robo3D.com and they're nice guys. I'll pick one up from them tomorrow...and shudder to think of it, I'll also pick up a Robo3D while I'm at it. I don't have a Cartesian so I thought I would try one - primarily since my wife is interested in buying them for her plant. She can't buy a fully assembled Rostock from me - primarily due to conflict of interest rules. L

There are three electronic supply shops and none of them have steppers.

[Eaglezsoar]

Believe it or not, regardless of its size, San Diego is not all that when it comes to parts. There is Robo3D though and they're nice guys. I'll pick one up from them tomorrow...and shutter to think, I'll also pick up a Robo3D while I'm at it. I don't have a Cartesian so I thought I would try one.

You are going to buy a Fartesian when all the beautiful deltas like the Orion exist?
Actually it looks nice but I did not say that.

[JohnStack]

Let's see if I can adequately answer this ( without offending ) anyone:

Pick one or more, they're all true:

I'm a technologist with entrepreneurial pursuits. I need try to carry a balanced viewpoint that's direct, specific, and hands on.
In every other technology I touch, I usually buy and dive into one of each principle design/technology (Windows v. Mac v. Linux, Android v. iOS, etc).
I like craft-brewed beer as much as I like a good single malt.

But, that said, there is no replacing my Rostock, the folks at SeeMeCNC and this community...

[Eaglezsoar]

Let's see if I can adequately answer this ( without offending ) anyone:

Pick one or more, they're all true:

I'm a technologist with entrepreneurial pursuits. I need try to carry a balanced viewpoint that's direct, specific, and hands on.
In every other technology I touch, I usually buy and dive into one of each principle design/technology (Windows v. Mac v. Linux, Android v. iOS, etc).
I like craft-brewed beer as much as I like a good single malt.

But, that said, there is no replacing my Rostock, the folks at SeeMeCNC and this community...

I was just picking on you, John. Truth be know the majority of Delta owners also have cartesian printers. I have an Orion, 2 Rostock Max, and a Prusa I3.
The Robo3d actually is priced good considering its print area. There are not a lot of reviews on it so it must be fairly new. Looks cool too.

[JohnStack]

I noticed in their forum at Cambo3D made lots of suggestions and modded quite a bit. Interesting to see. I'll you know how it goes. Hoping to pick it up today.