Robobot hardware

Revision as of 16:58, 30 October 2023

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Hardware

Mounting holes

The hardware is 3D-printed plastic (except for the electronics and screws)

All 3D printed parts have holes for mounting additional parts. These holes have:

• Individual hole distance of 1cm.
• Hole diameter of 2.5mm, intended for 3mm plastic screws.
• Plastic thickness is 6mm in most cases.

Screws for plastic (PT screws)

Mounting items on the 3D printed plastic should use plastic screws.

Plastic (PT) screws:

• Cut into the plastic with a sharp high-pitch thread.
• Gets locked into the plastic.

Plastic (PT) screw selection:

• Pan-head 3mm diameter and length:
  • 6mm, 10, 14mm, 18mm
• Countersunk 3mm
  • 10mm, 14mm

Screws for metal

Mounting of motors and other metal parts should use screws for metal.

Metal screw selection:

• M3 pan head
• M3 countersunk (for e.g. motor mount)
• M6 bolt, length 40mm?

Most screws for metal have a Umbraco (Allan) type drive.

Screw drive type

We could, unfortunately, not standardize on one type of screw drive type.

Drive types used:

• Umbraco (Allan) type: plane hexagonal drive and tool (mostly 2, 2.5, 3, 4mm)
• Cross PH (Philips type) is not used much (size PH0, PH1, PH2).
• Cross PZ (Pozidrive) is the most common for cross-drive (size PZ0, PZ1, PZ2).
• 6-lobe or (Tork) (size T10, T15, T20)