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08
June
2012

Rebuilding the printer: Part II


I picked up where I previously left off by first cutting out and mounting a new side panel. The panel is made of 1/4" MDF. This is where I'll mount all of the electronics for the printer.


New panel mounted!



Next step was to re-enforce the tilting vat holder. If you go back to the previous section where I first started making this tilt holder, you'll see that I've added a whole new bracket and cross-brace. The holder wasn't even close to rigid enough before.


This bottom c-channel piece is where the offset wheel will go - more on that later.


See how beautifully the vat slides into the tilt holder? I later removed the top "wings" of the side c-channel pieces of the vat with a dremel cutoff wheel, which allowed me to secure the vat using the 1/4"-20 thumb screws.


Here's the tilt holder mounted on the printer. The front two corners are held in place by two coned setscrews, which are threaded into the angle brackets attached to the XE-25 piece. The coned setscrews constrain the motion of the vat to allow only tilting - there's is absolutely no play in it, and I'm very pleased with how it turned out!


Side view of the tilt holder


Here the vat is slid into place to make sure the stage clears the sides of the vat. Sure enough, it needed a little adjustment.


Here's the offset wheel I had machined for the tilt movement.


It essentially acts as a small cam, machined to fit perfectly into the slot of the c-channel with a 5mm hole 1/8" (about 3mm) off-center.


Here the wheel is mounted to the X-axis stepper shaft. The offset hole gives me 1/4" of movement down-and-up for each revolution of the stepper motor. That's easy - just send the motor 200 pulses and you're done. (200steps/rev motor)



Here I've taken a break from the mechanical aspect of the build and wired up all the electronics on the inside of the MDF panel.


120VAC power comes in, is split off the projector, and the rest goes into the 12vdc power supply.


This is a 3A 12V DC power supply I go off eBay for around five bucks. I use it to power the stepper drivers.


I had to extend the motor wires for the Z axis by around 10 inches to make sure it could reach the motor drivers mounted on the side panel.


Everything is wired up and so far there's been no smoke - always a good sign!


Here everything is wired up and I'm testing communication between my software and the Arduino and stepper movement. Everything looks good!


Everything is mounted and ready to go!

Comments 

 
0 #2 henrypjs 2013-01-22 16:48
hi Chris,

I remember you used an additional firmware in the post:
28,MARCH,2012


But in this post I just find 1*adruino, 2*motor driver and 1* power supply,is that all for the printer? What about the firmware you used before?

I am following your step to build a new 3D printer and collecting the firmware now, your buildlog helps a lot!

Regards

Henry
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0 #1 comp and save coupon 2012-10-19 04:47
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