Revise Az tracking

[federico3]

Turns out laser-cut gears are super noisy and inefficient. Consider commercial alternatives.

Also consider making the position of the stepper something we can calibrate.

Options:

• Gears: ~$20
  • Stepper ($8.5). Can also get more teeth on eBay.
  • Arrow base (number of gears negotiable, $3.5. Can also go aluminum for $10)
  • Arrow base hub ($6)
• Timing belts
  • XL $30+8
  • Stepper $7.6
  • Arrow base $6.8
  • Hub adapter $4.5
  • Hub 8mm $6
  • Belt $4
  • 3mm ~$26+8
  • Stepper $3.4
  • Stepper hub $4.7
  • Arrow base $6.8
  • Arrow base hub ($6)
  • Timing belt $5-10
  • Tensioner bracket $5.1
  • Idler $2.5
• O-ring belt $22+8
  • Stepper $3.4
  • Arrow base $6
  • Arrow base hub $6
  • Tensioner bracket $5.1
  • Idler $2.5 OR alternative $6
  • Belt $6

A thinner 8mm hub (currently sold out).

[federico3]

Pros and cons.

Gears PRO: cheapest, stiffest. CON: least efficient, requires precise placement, potentially loud.

Timing belts PROS: more precise than O-ring. Easier to regulate than gears CON: most expensive, vertical clearance, least reduction (2:1).

O-ring PROS: mid-cost solution, easy to regulate. CON: potentially slips.

[federico3]

Progress! https://a360.co/3uOJDeg