dzach's Hadron build

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Removable X axis

Postby dzach » Wed May 02, 2012 8:11 pm

8mm holes in the plates with oversized springs are a convenient way to add some strain relief and hide cables.
2012-05-02-121928.jpg

However, they take away the capability to temporary remove the X axis for repairs, improvements etc.To be able to do that, one has to install connectors at the end of the cables and these connectors cannot pass through the 8mm holes.
2012-05-02-122246.jpg

So, I passed a tie-wrap through the hole
2012-05-02-131723.jpg

cut and added connectors to the stepper cable and X axis limit switch
2012-05-02-131808.jpg
It looks tight, but there is actually lots of space

and this is how the build looks tonight
2012-05-02-230505.jpg
dzach
 
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Location: Athens, Greece

Re: dzach's Hadron build

Postby JackInTheBox1982 » Wed May 02, 2012 10:31 pm

Please forgive if this is a little off-topic, but I was wondering what the advantages are of using direct-drive from a stepper motor, instead of using step-down gearing. Would this make much difference on resolution of printed components. I am currently working on my own laser-cutter and am unsure if I should use a drive-system that's directly attached to the output shaft on my stepper motors, or to use a drive reduction system.

Cheers,

Tim
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Re: dzach's Hadron build

Postby dzach » Wed May 02, 2012 11:17 pm

It depends on the rest of the linear motion system.
In general, using a drive reduction system gives better positional resolution and better torque. However, if you exceed the accuracy or torque requirements, then gearing down will just slow down the overall speed of the machine, without any real benefit.
dzach
 
Posts: 180
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Location: Athens, Greece

Not so simple

Postby dzach » Wed May 02, 2012 11:36 pm

This picture of the Quantum ORDbot wiring is deceptive: it's missing a lot of connections, like USB, power, heated bed, heated bed temperature and all limit switch signals.
Image
This is more or less what it should look like when complete:
2012-05-03-022823.jpg
dzach
 
Posts: 180
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Location: Athens, Greece

Re: Not so simple

Postby mxk » Thu May 03, 2012 1:09 am

dzach wrote:This is more or less what it should look like when complete:


Or like this
IMG_1024.jpg
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Re: dzach's Hadron build

Postby luiscp » Thu May 03, 2012 4:47 am

Here is my build in progress.
Attachments
DSC_4494.JPG
A picture of the whole thing.
DSC_4493.JPG
These is what I like about the Azteeg board. Since all the connection are coming from the side, it easier to keep it clean.
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Re: dzach's Hadron build

Postby naPS » Thu May 03, 2012 7:07 am

Here's mine. I've still got to route the main power and USB cable, but I'm still deciding where I want them to end up. So for now, they're just hung in place. I agree though, the Azteeg makes the wiring super clean.

TJK_8324.JPG
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Re: dzach's Hadron build

Postby dzach » Thu May 03, 2012 9:10 am

Thanks guys!
Good to see how other people manage the cable spaghetti. I left extra long tails so that the wires clear the heatsinks when they are installed, but I guess I'll have to tidy it up a little more. The cables are shielded and the black spider seen on the top is the common ground connection.

Keep the photo's coming!
dzach
 
Posts: 180
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Location: Athens, Greece

Re: dzach's Hadron build

Postby dzach » Thu May 03, 2012 2:35 pm

Here is my take 2:
2012-05-03-172413.jpg

I think it's better now.
dzach
 
Posts: 180
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Location: Athens, Greece

Not so easy

Postby dzach » Thu May 03, 2012 8:16 pm

I am afraid the wiki pictures show the Y axis built the wrong way.
This drawing, and all the model renderings and the STP file show clearly the carriage with the limit switch holes and the top t-slot to the left, looking from the motor to the idler wheel (rear to front). The tapped holes for the foot are at the idler wheel side.

However, these photographs:

ORDbot-heated-bed-s.jpg
ORDbot-heated-bed-s.jpg (22.65 KiB) Viewed 16060 times

ORDbot-sphere-s.png
ORDbot-sphere-s.png (143.67 KiB) Viewed 16060 times

ORDbot-asm-s.png
ORDbot-asm-s.png (132.82 KiB) Viewed 16060 times
and most of the rest show the limit switch holes and the top extrusion t-slot to the right.

I initially followed the drawing and drilled the Y-axis bottom hole according to the drawing. After that however, the tapped holes were on the wrong side of the extrusion. The pictures were also proving that I drilled the hole on the wrong side. This led to the first reassembly of the bot.

Then, just as I finished cutting and connecting all the wires to the RAMPS board, I realised that there is no way to wire the Y-axis limit switch on the bottom side of the carriage plate and drive the cable to the bottom left (looking from the rear) Z-axis extrusion hole, because the wires would be crossing the belt and interfering with it.

Conclusion:
The model and the drawings are correct and the Y-axis limit switch can be wired on the bottom side of the plate, if the drawings are followed. The wiki pictures show a different assembly.
The Y-axis foot holes of my kit were tapped on the wrong side of the extrusion.
Now, I either need to wire the Y-axis limit switch on the top of the carriage plate or I should reassemble the bot like in the drawings, after tapping the other side of the Y-axis extrusion, and go back to the first hole I drilled, which I thought was wrong.
And go again through the wiring hell :(
dzach
 
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