Sovol SV08 Multiple Motion System Upgrade.
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@dwuk Modelling for first re-modelled part now complete - existing gantry move of cogged pulley, plus making space for extra belts. - ready to test print tomorrow.
Split part into two for printing - as existing part injection moulded.
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@dwuk said in Sovol SV08 Multiple Motion System Upgrade.:
about the excenter bearings
They aren't available off the shelf, you just have to use regular bearings and make an offcenter shaft for it.
When the shaft rotates (max 180°) , the bearings translate the offset to the housing where they are pressed in.
That's a much easier task than to overcome the stiktion of linear bearings.I have a vision of a planetary gear with three planets and a rotating orbit. This would give you a compact, yet powerful setup with a NEMA14 pancake stepper (they often come with a pinion, like the orbiter motors)
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New parts progressing - original gantry pulley repositioning done.
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@dwuk Designs for all parts on right hand side now completed - and printing underway. Left hand side fairly easy to derive as is mostly a mirror copy - with some height changes.
Biggest issue is losing about 25mm build volume at front due to idler and about 15mm at the back. Will need to address these two issues at some point.
Also had to remove the tensioner spring part to save a bit of space - so will need to so how well the tensioning works with just the side bolts.
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@dwuk Equal belt tension is a critical part for a CoreXY. I hope you are still able to adjust all belts individually.
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@o_lampe thanks. Yes tensioning will still be possible. In the factory design there are bolts that pull against springs to adjust the tension from the back, which are then locked off from the side.
I've removed the bolts and springs for space reasons - will try to add them back in - but probably coming in from the front.
All three pulleys at the front still have about 10mm of independent movement.
I think I will also try removing most of the lost build area too by repositioning the pulleys before I go much further.
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@dwuk Reworked the design of the right hand parts and belt paths - to make to routing more compact - so a lot less build plate now lost.
These screenshots show the factory single gantry front and rear part on the left - with the new double gantry parts on the right.
Improved more compact belt routing on right hand side
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Still waiting for a few parts - but basic Phase1 structure now complete - just needs to be belted up.
Next step if to belt up both gantries and try running the original front gantry using the existing Klipper board just to see if it still works with the new belt routing and the 2nd gantry in the back.
Still awaiting Mini 5 Duet Board delivery - but rest of boards arrived ok.
Have used smaller New
2nd extruder on back gantry just there for illustration purposes of size target - it is a Bowden extruder from the WeedoX40 donor machine.
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@dwuk Having a bowden extruder in the mix makes sense if you want to print infill_every_nth_layer with a bigger nozzle.
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All belted up.
Short a few parts before I can do a proper test - most important of which is the linear rail carriages for the 2nd gantry, plus some idler posts.Some belts quite close to each other - will try both gantries out next - will have to swap the carriages.
Rear left
Rear right
Front left
Front right
Top with rear top halves on
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@dwuk really enjoying following along with this build. Good to see the multiple motions systems code getting a chance to be used on a two head toolchanger!
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First test of the mechanics - to make sure I haven't messed up Gantry1.
Worked surprisingly well on existing Klipper board - see short video demo.
https://youtu.be/3d6z5srohSQ
Can't yet get gantry 2 to work - due to lack of linear rail carriages, plus motors are probably not powerful enough - as for first try they didn't move.
Will try Swapping the motors around before upgrading.
