September 27, 2019 at 11:03 pm #115746
Trying to track down that last bit of Z accuracy so I can cut rabbets.. turns out the biggest source of error I have right now is sag on the Y plate on the side all the electronics hang off. It’s sagged almost 2mm compared to the other side throwing off my Z height. I’m able to compensate with a 2mm shim but wondering if anyone managed to solve this better?
1 user thanked author for this post.September 28, 2019 at 8:49 am #115767
Well it looks like we have the main solve for the next revision. This is not the first time I have seen this. What all do you have on there?
Unload it as much as possible, did your MDF bend, or did the plastic parts warp (pla)? Maybe your bolts are just loose?
My original is still good, I have the vac hose hanging down about 3 feet, 12v6a power brick, Rambo and lcd. PLA parts.September 28, 2019 at 8:53 am #115768
That did give me an idea, I will need to sketch it out.September 28, 2019 at 9:52 am #115771
We need a high rider to follow the low rider with it’s electronics. We can just PR Marlin to add a mirrored board and call it DUAL_ALL_MOTOR. Or we could use Jamie’s double decker build.September 28, 2019 at 11:00 am #115777
I’m pretty sure it’s the ‘ears’ on the MDF bending with the weight.. even if I just push with my fingers they flex. I will double check the bolts and PLA.
I have the power brick, a raspberry pi, rambo mini, screen, shutoff switch and electrical outlet mounted on 1/4″ hardboard attached to the Y plate. The hose and power cable hang down off that side and I do most of my cutting on that side so there is usually the weight of the router as well.
High rider! Or maybe an Ultra low rider.. have it crawl along a track under the tableSeptember 29, 2019 at 11:47 pm #116022
im looking at a double decker are there any plans for this jamies one thanksSeptember 29, 2019 at 11:50 pm #116023
it looks like the best plates would be steel or aluminium, but if you have to use wood plywood is stronger than MDF and is a better choiceSeptember 30, 2019 at 1:21 am #116028
I am pretty sure Jeff was kidding — nobody has made a double-decker for LR2 that I am aware of. I have some half-baked STL files for the double-decker MPCNC here: https://www.thingiverse.com/thing:3709811
In particular I have hybrid rollers for 25.4 mm gantry and Z rails that fit with 23.5 mm side and leg rails, and I have corner pieces that allow the legs to extend vertically through the corners. I think the rest are all standard pieces for the double-decker MPCNC (mixture of 25.4 and 23.5) but I’d be happy to share other pieces if it turns out I missed something.September 30, 2019 at 6:54 am #116068
I am pretty sure Jeff was kidding — nobody has made a double-decker for LR2 that I am aware of.
It isn’t double-decker in the same way yours is (with dual carriages and drive belts), but they did double up the rails to prevent Z rail deflection (at least that’s what it looks like).
September 30, 2019 at 7:31 am #116079
- This reply was modified 2 weeks, 5 days ago by frosty.
I did not know that! Interesting.September 30, 2019 at 7:36 am #116082
Wow that’s a lot of extra weight but certainly rigid. According to sagulator, plywood is indeed way stiffer than MDF. Maybe just recutting out of 1/2″ baltic birch would help.September 30, 2019 at 3:11 pm #116161
I’ve never seen that lowrider before!
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