2.3. MyoBone ‘20mm bone’ Monolithic Profile - GI Mod

The ‘20mm bone’ is a newly developed monolithic bone for affordable and robust MYO robots. It uses a 6mm groove, 20mm aluminium profile (i.e. Bosch Rexroth, Easy Systemprofile, etc.) as the base and adds laser sintered PA components for mounting muscles and joints.

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Fig. 2.26 Visualisation of assembled 20mm bone with mounted muscle and symmetric joint.

2.3.1. Parts List

The parts list is maintained at roboy.open-aligni.com.

External users can access it using the following credentials:

  • user: roboy
  • password: roboy
Table 2.1 Partslist of 20mm MyoBone
Level Manufacturer P/N Manufacturer Name Part Type Description Quantity Designator
Level Manufacturer P/N Manufacturer Name Part Type Description Quantity Designator
0 Myo Bone Rexroth 20mm x 350mm GI Bones Rexroth bone assembly of bone, thread, 2 flanges 1  
1 Strebenprofil 20x20mm Nut 6 Easy Systemprofile Screws, Bolts and Rods   0.35  
1 Cut thread - M6 Easy Systemprofile Labour Gewindebohrung Rexroth 2  
1 A11 conical flange plate mod für Boschprofil Shapeways MyoCAD Myo Flange for 20mm Rexroth 2  
1 Myo Clamping Ring Set GI Accessories Ring that binds 2 flanges together 2  
2 A11 clamping half ring mod Shapeways MyoCAD Clamp ring to hold the two flange plates together. 2  
2 1018-066 Wegertseder GmbH - Schrauben Shop Screws, Bolts and Rods Zylinderstift 3x8 4  
2 2534-288 Wegertseder GmbH - Schrauben Shop Screws, Bolts and Rods Zylinderkopfschraube M3x18 2  
2 852 000 030.800 Kerb Konus Nuts, rings, inserts Brass Insert M3 2  
1 2534-314 Wegertseder GmbH - Schrauben Shop Screws, Bolts and Rods Zylinderkopfschraube M4x8 4  
1 Nutenstein Nut 6 M4 Easy Systemprofile Screws, Bolts and Rods Nutenstein schwer Nut 6 - M4 4  

2.3.2. Profiles

2.3.2.1. Step 1: Cut profiles to the desired length

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Tips:

  • Using circular saw creates a suitable cut and provides a good surface

2.3.2.2. Optional Step 2: Cut a (longitudal) thread into the core of the profile

Cut a M6 thread into the end pieces of the profile.

2.3.3. Adaptor

2.3.3.1. Step 1: Print or order flanges

The bone requires 2 A11 conical flange plate mod für Boschprofil as the end caps and interfaces to joints. These connections are secured using the A11 clamping half ring mod of the Myo Clamping Ring Set.

Parts can be printed using services such as shapeways.com or virtually any SLS printer.

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Fig. 2.28 A11 conical flange plate mod für Boschprofil

2.3.4. Assembly

2.3.4.1. Step 1: Mount flanges

Place the flanges

2.3.4.2. Step 2: Attach the SB flange plates

../_images/image70.png

Screw the SB flange plates to the adaptors with the M3 screws and nuts.

Tips:

  • Use the small spring washers together with the M3 nuts (backside)

2.3.4.3. Step 3: Drill the profile for electric cables outlet (if necessary)

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Drill an outlet for the electric cables at the suitable position.