Robobot hardware: Difference between revisions

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* Plastic thickness is 6mm in most cases.
* Plastic thickness is 6mm in most cases.


==Screws for plastic (PT-screws)==
==Screws for plastic (PT screws)==


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


Plastic screws:
Plastic (PT) screws:
* Cut into the plastic with a sharp thread.
* Cut into the plastic with a sharp high-pitch thread.
* Gets locked in the plastic and will not shake loose.
* Gets locked into the plastic.


PT-screw selection:
Plastic (PT) screw selection:
* Pan-head 3mm diameter and length:
* Pan-head 3mm diameter and length:
** 6mm, 10, 14mm, 18mm
** 6mm, 10, 14mm, 18mm
* Countersunk 3mm
* Countersunk 3mm
** 10mm, 14mm
** 10mm, 14mm
[[File:PT-screw.png]]


==Screws for metal==
==Screws for metal==

Revision as of 15:57, 30 October 2023

Back to Robobot B

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)