Enrageds Hadron Build and random thoughts

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Re: Enrageds Hadron Build and random thoughts

Postby Enraged » Fri Aug 31, 2012 12:39 am

So apparently one of my major issues was my own fault (insert facepalm).

During initial setup and testing, I set my Z axis to full step..... and then promptly forgot to change it. With M8 threaded rod and 1.8* motors, that gives me a 160 steps/inch. 25.4mm/160=0.15875mm per step. So, it seems that every few Z axis changes when printing, it would go to the closest degree it could, which was too much or not enough, and boom, failed print.

Changed it to 1/8 step (1280steps/inch) and now my resolution is 0.0198mm, more than enough. Printing now, I'm already noticing less Z "wobble". When one side went to the wrong "step", it would tweak the gantry in one direction, making the wobble worse....

But I'm still replacing the Z screws with ACME threaded rod. I ordered 2 1/2"-10, 12" long with delrin nut and bearings for $40 shipped from an eBay seller. I also ordered some new clamping couplers, so no more set screws.
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Re: Enrageds Hadron Build and random thoughts

Postby AVRC » Fri Aug 31, 2012 3:12 am

That doesn't look right.

M8 rod is 1mm per revolution.
Single step with 1.8 motors is 200 steps per revolution.

This gives .005mm per revolution.
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Re: Enrageds Hadron Build and random thoughts

Postby mikegrundvig » Fri Aug 31, 2012 3:03 pm

It's 1.25mm per revolution isn't it so 0.00625mm per 1.8 degrees of rotation.

BTW: some very useful microstepping information and a good reason to go with 10x microstepping on all stepper projects:
http://geckodrive.com/forums/showthread ... by-default
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Re: Enrageds Hadron Build and random thoughts

Postby canadianavenger » Fri Aug 31, 2012 3:22 pm

M8 thread is indeed 1.25mm pitch, M6 thread is 1mm.

With M8 rod, you'll get 4064 steps per inch, with M6 rod it is 5060 per inch, using full stepping.

Metric Thread Pitches
M2: 0.4
M2.5: 0.45
M3: 0.5
M4: 0.7
M5: 0.8
M6: 1
M8: 1.25
M10: 1.5
M12: 1.75
M16: 2
M20: 2.5
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Re: Enrageds Hadron Build and random thoughts

Postby Enraged » Fri Aug 31, 2012 3:44 pm

so the 160 (my original setting) in Marlin is steps/mm or steps/inch?

either way, it seems to have fixed one of my major issues.
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Re: Enrageds Hadron Build and random thoughts

Postby AVRC » Fri Aug 31, 2012 5:10 pm

My mistake, it is 1.25 pitch.

The 160 is steps/mm with single stepping.
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Re: Enrageds Hadron Build and random thoughts

Postby Enraged » Fri Aug 31, 2012 5:37 pm

well I was obviously out to lunch doing those calcs then.

So why did I see such an improvement switching to 1/8 microstepping?

I was printing last night at 195*, 0.2mm layer height, and getting great results... until my computer froze (I think due to slic3r).

I'm really looking forward to the SD card and control panel that Royco is working on. Combine that with his new Azteeg X3 and my new qubd dual extruders, and the new Z axis ACME leadscrews, I'm hoping to get even better quality results.
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Re: Enrageds Hadron Build and random thoughts

Postby Enraged » Sat Mar 16, 2013 3:59 am

a brief update:

The tensioner on my original wades reloaded cracked, so my Ordbot was out of commission. I received my qubd hot ends, and after spending a bunch of time and money getting different wheels, Barts tensioner thing, I gave up on them. I'm using the motors, thermistors, and cartridge heaters with my new Wades Reloaded and Jhead. If anyone wants the rest of the bits I'll let them go cheap, but I don't know how useful they would be.

I just received my Wades Reloaded from this ebay seller: http://www.ebay.ca/sch/andyh3009/m.html ... 4340.l2562

He shipped the parts from the UK for less money than some sellers wanted to ship from Washington state to BC, and his service was top notch. The quality of the Wades Reloaded is very nice, I think he printed on mylar or some sort of clear plastic, and then trims the parts out after. The plastic film is firmly attached to the prints.

I'm reassembling everything and I'll recalibrate this weekend, and hopefully (finally) get some good prints out of this machine.
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Re: Enrageds Hadron Build and random thoughts

Postby Enraged » Sat Mar 16, 2013 10:45 pm

new wrench in the mix: printed a calibration cube, looked decent, changed some settings and went to print again, all of a sudden it looks like the extruder is losing steps, or something.

Turns out, the qubd motor got so hot, it MELTED THE PLA drive gear so the gear was spinning on the stepper shaft. I'll be switching it out for my old extruder motor.

I actually have a shirt that perfectly describes anything I do with qubd: http://www.thinkgeek.com/product/e5c1/
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Re: Enrageds Hadron Build and random thoughts

Postby mikegrundvig » Sat Mar 16, 2013 11:33 pm

I switched to a MakerGear Plastruder after seeing and reading all the problems people have with the QU-BD. I don't have a single regret with that decision. The plastruder is dead reliable and super effective. It just works, all the time, every time. With that said, it's damn heavy so I'm going to be trying out the Airtripper filament drive + JHead next for my 12" build.

On the QU-BD, Rodney has followed all the advice posted on the wiki here and gotten them to be quite solid. The combination of new drive gear and spring loaded tensioner do seem to work.

-Mike
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