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| picclock's modified i3 3d printer attempt |
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| picclock:
OK next installment. Pictures of the adjustable y axis rod mounts, also picture of a budget (99p) adjustable buck convertor. This will allow me to run the 12 volt fans and power the Arduino board from a 24V supply. Proposed design (pdf) for the print bed minimising weight. More pictures and progress as soon as I get time. Best Regards picclock |
| picclock:
A little progress. Y belt tensioner and motor mount. The vertical belt alignment from drive to bed to idler seems quite critical if accuracy is to be maintained. Even small errors may cause belt stretching which will erode the accuracy. Simple spring belt tensioner with scrap will make system more forgiving. Next episode the bed :dremel: Best Regards picclock |
| nrml:
That is a very nice tensioner. Dare I say a bit over engineered, but then the very best things are always over engineered :thumbup:. |
| PeterE:
picclock; Nice bits well made :thumbup: You are on your way now, will be nice to see it come together. /Peter |
| picclock:
So i have finally finished the parts for the bed. Pictures tell the story. I have high hopes for light weight, accurate tracking and good precision. The glass looks red in the pictures because that's the back of the mirror coating. First the belt to mirror clamp. This clamps onto the end 10mm of the bed glass, based on an engineers type clamp. I was concerned about lack of grip but I statically tested it to over 5Kg then pushed probably at least another 5. The clamp is very good. Next the bearing carriers. These are made of 1/16th fiberglass, The two bearings aligned on a smooth rod then epoxied to the carrier. Surfaces were roughened and high temperature epoxy used. The bearings were aligned so that the 4 internal races were at 45degrees to the vertical to ensure accurate tracking when weight is applied. The single bearing and carrier float to become self aligning. Approx 2mm of lateral movement is allowed. Full bed assembly showing heater pcb. This will be covered with 2mm of cork to decrease heat loss. Clip handles will be removed when in use. Next installment drilling the granite worktop . Thanks for your interest Best Regards picclock |
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