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Murray McEwan
@murrayj
Murray McEwan
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| Member Since 11/16/2021 | |
| 1 | Reputation |
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| 0 | Guides |
| Member Since 11/16/2021 | |
Note: it may not be obvious from the picture, but the Y endstop must be placed on the top rear cross rail, not on the left upright. Otherwise, there is nothing that will make contact with it. It is hard to see where that dashed line is intersecting, be better if it were a dashed PINK line :) I was looking all over the place for another stl file that I hadn’t yet made that would hit this switch.
The lead screw nut is the plastic threaded piece that screws onto the lead screw at step 4.
I had an extra 6mm shim washer left over which I put between the endstop block and the left XY joiner to fill the gap and not break through the bottom of the stop as the bolt was retightened. I sanded the stop so that it fit and slide easily off the end of the rail (there is a right way and a wrong way to put the stop block on, its bottom groove has to align with the rail).
NOTE: make sure to check how far the M6x20 capscrews project past the surface of the block! The max depth of the T slot is 9mm and I found that most of the bolts stuck through at least this far, or even farther. This means the screws bottom out in the T slot, and this is proven by the appearance of a scraped ring mark in the bottom of the T slot where the bolt rubbed when tightened. This in turn can force the frame apart at the corner, which affects overall squareness and parallelism. I had to chase down why my frame was 2.5mm wider at one side than the other, and why I couldn’t seem to close up one corner. This was why.
Suggest: M6 x 18 capscrews be used, or else modify the printed part and reduce the depth of the counterbores so the screws do not project too far through.
I found it easier to assemble the whole stack of bearings, belt and spacers on the 5 x 40mm bolt (pushed home in the green part) BEFORE fastening the green part to the frame. This way you can steer the bolt into the hole in the lower metal corner piece easily without losing anything in the stackup.
It is relatively easy to push the T-nuts into position afterwards and screw in the 3 main fasteners.