Re: Worm Drive Grounded Delta Printer

@Jon,

Looks fantastic! (tu)
Got video candy? :D

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End effector Hub assembly:
I just noticed your hot end design/assembly! (tu)
It looks like you have a bespoke hollow threaded aluminum tube running down the center of your end effector hub.

Are you using the aluminum tube to sandwich the hub, and bearings tightly together so the assembly is ridged?
Are the 3 bearings touching each other, or is there plastic separating them?
The bearings look larger than 608's, what series are you using?



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Redesign of the Hot end/end effector/hub:
To increase rigidity of the end effector I'm redesigning it to use a hollow threaded rod with bearings clamped in between.
Either an electric lamp fitting, vented SHCS, a vented stud, or your hollow threaded aluminum tube will be used.

A discussion about the end effector modification begins in the Lisa thread:
[forums.reprap.org]

Material suppliers:
Electric lamp fittings
[www.sizes.com]

1/4-27, Dia 6.35 mm (0.250"), 626 bearing 6x19 mm.
1/8-IP, Dia 10.29 mm, (0.405"), 6800 bearing 10x19 mm.
1/8-IP, Dia 10.29 mm, (0.405"), 6900 bearing 10x22 mm.
3/8-IP, Dia 17.15 mm, (0.675"), 6703 bearing 17x23 mm.
[www.bearingworks.com]

Lamp stuff
[www.profhdwr.com]

Lamp parts
[www.txlampparts.net]

3/8-ip nuts are 27 cents each at:
[www.iqlightbulbs.com]

M8x40mm, 7.41ea, Vented Socket Head Cap Screws
[www.mcmaster.com]

M8x50mm, $15.19ea, Vented Socket Head Cap Screws
[barnhillbolt.com]

5/16-18, $16.00ea, Hollow Threaded Studs
[www.mcmaster.com]

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Hub offset:
I have a question about the end effector hub offset.
I want to design my arms to be inline with the end effector hub/pivot axis,
but I'm unsure if I'm violating the laws of physics.

In this image I can see that your end effector bore in the hub is offset relative to the arm.
Is this to prevent a singularity, or is it for some other reason?




Tks!