Lex Log

Lex Berezhny

Oct 14, 2017

• File:CNC Torch 1708 Z Axis.fcstd
• Lex Meta Notes

Oct 12, 2017

• OSEDev Workbench

Oct 11, 2017

• File:CNC Torch 1in carriage.fcstd File:CNC Torch 1in carriage metal plate.fcstd - Updated all holes to be R0.155".

Oct 10, 2017

• Dev Meeting
• File:CNC Torch 1in carriage.fcstd - Changed bearing grove from 1.3" to 1.36". Increased length of long side from 5.9" to 6.0". Moved bolt holes on each end by 0.1" towards the edge.
• File:CNC Torch 1in carriage metal plate.fcstd - Plate thickness changed to 0.25". Bolt holes resized to 0.155". Bolt holes moved closer to edge to match the plastic.

Oct 9, 2017

• File:GT2 double pulley.fcstd - recreated the pulley in FreeCAD Sketcher WB from provided dimensions

Worked some more on the GT2 double pulley trying to get the belt and teeth done. Josh helped me out a lot with answering questions, etc.

I think the main issue is that I was using FreeCAD 0.17 (daily build) and it's just too buggy. Going to continue later with 0.16 and see if it's a smoother experience.

Wrote a little bit of Python code for Michel to help him with his blender part exploder.

Oct 8, 2017

• File:GT2 double pulley.fcstd - double pulley with 20 teeth, mirrored from this single version: from https://grabcad.com/library/timing-pulley-gt2-20-teeth-5mm-bore-2/details?folder_id=2369004

Oct 6, 2017

• OSE Market
• OSEDev Kit
• OSEDev Workbench
• File:CNC Torch 1in carriage.fcstd
• File:CNC Torch 1708 Motor interface.fcstd

Oct 3, 2017

• File:GT2 double pulley.fcstd

July 22, 2015

Direct modeling CAD systems (SketchUp) can be made more precise and predictable by adding some facility for parameterization, this technique is called: Variational Direct Modeling

http://www.ledas.com/pdf/VariationalDirectModeling.pdf

For an even broader overview of why variational direct modeling is a way forward: Direct Modeling - Who and Why Needs It? A Review of Competitive Technologies

A potential open source direct modeling CAD application should have this feature.

July 19, 2015

Researching the implementation of an Operational Transform web based CAD system.

Purchased a copy of this paper: Operational transformation for dependency conflict resolution in real-time collaborative 3D design systems

Which discusses a few specific OT functions necessary to deal with graphs of dependent objects, essentially this resolves some issues related to multiple people editing inter-dependent parametric data at the same time and how to merge conflicting operations.

Full size "mech warrior" robots, could be re-purposed to do construction/agricultural work... http://www.megabots.com/

Also, PhD Thesis on walking robots: Robust Execution of Bipedal Walking Tasks From Biomechanical Principles