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Experimental Cupcake CNC Sequential Build Platform

by pandelume, published

Experimental Cupcake CNC Sequential Build Platform by pandelume Apr 27, 2010

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Description

This is an experimental concept for a drop-in replacement of the cupcake CNC x-y stage. The idea here is that the y-stage is replaced by a stepper-driven conveyor belt that will move back and forth during build, and then be driven forward to eject the part after the build is complete. So far I don\'t have a 3-d printer or lasercutter, so it\'s a concept only - but I figured that this was the place for it even during development. I would very much like to hear suggestions for improvements. Conveyor and timing belt routing should work, but could be better. At the moment you need 7ct .25\" rods to route the conveyor belt, and it would be nice to cut that down.

The conveyor is baking parchment taped together with kapton tape. Baking parchment can withstand temperatures of 400+ degrees F and is relatively cheap and readily available everywhere. I think this will work, but perhaps someone with a printer can try lining their print bed with a square and see how it stands up. The conveyor is driven around a set of printed rollers, each with o-rings (they go in the grooves or rollers A and B) to help grip the parchment. As modeled the conveyor has no tensioner, but I think it may need one. At the front of the build area the conveyor is routed between two .25\" rods, which is supposed to peel the parchment off the bottom of the ABS part - hopefully that will work.

Most of the parts for this can be printed on a cupcake CNC, the exceptions being the sides and build stage, which are too large - they might fit on a Mendel. In any case I have included .STLs and .DXFs where appropriate. The basic construction is the T-slotted panel construction common to the rest of the cupcake.

I have an assembly drawing, but I just noticed some errors so I'll upload once I've corrected them.

Recent Comments

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Nope. Do you have a link to the one that was tested? I'm not familiar with it.

Good point about the heated build platform - does anyone happen to have the stackup of the heated build platform v2.0? Judging from the pictures, it's 1/4 -3/8" above the standard build platform. Also, the nuts and bolts that are proud of the heated platform would impede the conveyor belt, but maybe the heated platform could sit on some shorter studs and be held in place by the tension of the belt.

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Instructions

1) Obtain all parts
2) Assemble Conveyerized X-Y Stage
3) Remove the Standard X-Y stages from the cupcake, and install the conveyorized stage.

Comments

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MarcusWolschon on Apr 28, 2010 said:

Is this the belt that was tested at NYResistot?

pandelume on Apr 28, 2010 said:

Nope. Do you have a link to the one that was tested? I'm not familiar with it.

natetrue on Apr 28, 2010 said:

Ooh, I like that idea. Using the Y-axis motor as the belt driver too is a genius concept. You'd definitely have to use a heated platform below it, to make sure the ABS doesn't shrink and pull up the belt.

pandelume on Apr 28, 2010 said:

Good point about the heated build platform - does anyone happen to have the stackup of the heated build platform v2.0? Judging from the pictures, it's 1/4 -3/8" above the standard build platform. Also, the nuts and bolts that are proud of the heated platform would impede the conveyor belt, but maybe the heated platform could sit on some shorter studs and be held in place by the tension of the belt.

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