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Lars v2 Ultimaker XY Block

By CCS86

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calinb
calinb
about 3 years
Yes--I had the "ears" over the belt, which is backwards. I now see how they center the belt clamp when installed in the correct orientation. The linked CAD rendering of the new clamp helps. Thanks!
CCS86
CCS86
about 3 years
It sounds like you are putting the belt clamp on backwards: https://imgur.com/8WgMUgi
calinb
calinb
about 3 years
And thank you very much for posting your very nice design!
calinb
calinb
about 3 years
I wasn't concerned about the pad contact. Actually though, it's not centered on the pad either and the clamp hangs off to one side of the pad (instead of both sides overhanging a small but equal amount in my remix). Rather, I desired better belt security with lower screw torque and clamp pressure. One ear was completely hanging off to the side and the other pad made full contact with the belt so the pressure on the belt was only on one side (from one "ear"). Both ears of my remixed clamps apply nearly equal pressure to the belt. With netfabb basic and the .fabbproject file I provided, it's possible to make either clamp ("New" or remix) visible and rotate the assembly around to see the offset and overhang. Please understand that I really like your design, and I've downloaded and looked at many and tried a couple of them. (I did a remix of Chopmeister's "Twister Blocks" years ago to gain a few mm of travel.) I'm sure that your clamp works, but the offset was something that was bothering me.
CCS86
CCS86
about 3 years
The mount hole is still centered over the belt contact pad, which is the important thing. I can't think of any mechanical benefit from having the anti-rotation "ears" centered about that hole.
calinb
calinb
about 3 years
Looking at your .png renderings and comparing the older ver. "new" belt clamp, the new clamp screw hole location is not ideal. I believe the "alignment" ears should be centered on the belt and the slot and the "Belt Clamp New" places one ear off the edge and the ears are not centered on the slot or belt either. Lacking source, it's always a pain to edit a mesh file, but I used netfabb and blender to move the hole in the clamp. See netfabb screen capture or use netfabb to open the fabbproject file (I think netfabb Basic is still available for free) to see the assembly positions of all parts with the new clamp and I remixed the belt clamp: https://www.youmagine.com/designs/lars-v2-ultimaker-xy-blocks-remix-belt-clamp-new-remix-only#information
CCS86
CCS86
almost 4 years
@keifer-miller It looks like you have a significant amount of over-extrusion in that print. This will lead to more belt preload than intended, and excessive stress in the clamp. I would suggest either reprinting with reduced extrusion rate, or trimming off the excess material on the belt clamping surface. I would also recommend using a large washer on the clamp bolt. I use a 9mm OD washer. On the Protopasta HTPLA, I have some rolls that became so brittle, the filament broke when unwinding the spool. You can give yours a test by bending some filament. I am a big fan of Polymaker PolyMax PLA for parts like this. It has increased ductility/toughness over standard PLA. Beyond that, it's possible to overtighten. You can test this by just snugging the clamp, then holding the belt with one hand and XY block with the other. Try to slip the belt a little. Then snug the bolt more and try again. You will get an idea of what tightness locks the belt to the block. Add a little extra for good measure and you should be good to go. It's not a bad idea to use some blue thread locker on the bolt as well, since it won't be "fully" tightened. This will keep it from loosening over time.
Keifer Miller
Keifer Miller
almost 4 years
I'm using ProtoPasta's HTPLAv3. Not heat treating it. https://i.imgur.com/yXbOPDY.jpg It starts out small and then slowly penetrates towards the other side until it progresses far enough that the clamp fails.
CCS86
CCS86
almost 4 years
Where is the clamp cracking? I have never had a crack in these parts. Post a photo if you can. What PLA are you using? Some are far more brittle than others.
Keifer Miller
Keifer Miller
almost 4 years
I really like the design, however I've had a heck of a time with the belt clamps developing cracks when printed in 100% infill w/ PLA. Be very careful not to overtighten them.
CCS86
CCS86
about 4 years
Hey guys, I decided to rev the belt clamp again. Changes: - A little more preload on the belt - Tighter bolt hole - Alignment ears The goal was to make the clamp less likely to twist out of place when adjusting, and to minimize the risk of the clamp shifting during high-G print moves
Curven
Curven
about 5 years
Ouah that was fast! Thanks a lot!!! I hope my GT2 belts and pulley's will be here soon!
rowiac
rowiac
about 5 years
@Curven, I didn't notice the fact that these were designed for 12mm bushing vs. the standard 11mm ones on the UMO+ until you mentioned it. That explains why the bushings were loose in the blocks I printed. However, I solved it by wrapping a strip of paper (a Post-It note in my case) around the bushing a couple of times as a shim. This has been working fine for about 9 months, but I have had to tighten screws once. Recently I added a dab of white glue to the bushings to keep them from sliding. Some Loctite on the screws probably would have helped as well.
CCS86
CCS86
about 5 years
11mm bushing version added!
Curven
Curven
about 5 years
Hi CCS86, would it be possible to share the 3D files or upload a Version for 11mm bushings please? Thank you very much.
CCS86
CCS86
about 6 years
The back block has extra clearance for the Z stage bushings, which you may or may not need it depending on your platform / print head configuration.
rowiac
rowiac
about 6 years
I'm finally getting started on a GT2 belt/pulley upgrade for my UMO+ and I saw these v2 blocks. I'm trying the figure out the difference between the regular and "back" XY block. Does the "back" XY block go in a particular position and what is its purpose? Thanks.

Tags

ultimaker UM light clamp rod xy blocks umo umo+

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