Design the central shaft

[dankamongmen]

We need a central shaft on which the magic can happen. It ought fit within the air shield (see #10). It must be mounted to the load cell. It should be as light as possible. It must not receive support from anything but the load cell, or our weight sensing will get wrong results. I'm imagining an upside-down L mounted to the load cell's side and coming out to the center. It then expands into a walled recess into which a bearing is placed. From that bearing arises the central driveshaft. There will be a spacer, then the central gear (and see #10 regarding its effects on shield design). At the top, it expands into a platter onto which the spool will be placed.

Considerations:

• the platter is significantly wider than the shaft. How do we make this stable?
• Right now, the load cell is mounted to the floor of the croom. Any height by which we elevate it reduces the height of the shaft, adding stability. How tall can we take it? The motor would need be elevated a corresponding amount.
• How to keep the spool from moving?

[dankamongmen]

i think we ought print the platter distinct from the shaft itself, so let's go ahead and whip that up. it ought be a wide circle (maybe half the spool diameter) and a small circle (just about the central hole size) with a hull() taken over them. there ought be a hollow column, almost the small circle's size. then another hollow cylinder ought plug in, which can go into the middle of the spool. this way we can have multiple columns, one for each spool size, which will keep them from shifting.

[dankamongmen]

alright, this is working!