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.

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¶

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.

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¶

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)¶

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