Mictrotractor Review: Difference between revisions
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<html><iframe src="https://player.vimeo.com/video/134305061" width="500" height="281" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe> <p><a href="https://vimeo.com/134305061">OSE Microtractor Workshop</a> from <a href="https://vimeo.com/ruthdusseault">Ruth Dusseault</a> on <a href="https://vimeo.com">Vimeo</a>.</p></html> | <html><iframe src="https://player.vimeo.com/video/134305061" width="500" height="281" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe> <p><a href="https://vimeo.com/134305061">OSE Microtractor Workshop</a> from <a href="https://vimeo.com/ruthdusseault">Ruth Dusseault</a> on <a href="https://vimeo.com">Vimeo</a>.</p></html> | ||
=Known Bugs= | |||
*There are tracks with links either 1/2" and 3/8". One track piece gets stuck some times. Need to grind drive cog to more taper of teeth. -7/29/15 | |||
*Track sections are difficult to weld. Flat bars can't be used, as a part of the links needs to have a standoff | |||
*Machine height of 58" is too tall - and appears to be not marketable as far as a consumer good | |||
=Good Points= | |||
*Success metric - machine spins 360 degrees in place as expected. | |||
*Torque of 7500 lb at 2 tracks is significantly stronger than industry standards. | |||
*DIY build suggessful - track sections build with cutting, hole punching, and welding jigs. | |||
*Pipe wrench bending of idler shape works on 1/4" steel plate | |||
*Tensioner works as expected. | |||
*A 1" pin on track sections - if we compare that to 3" cylinders where a 1" pin holds 20,000 lb - is sufficiently robust to hold 6000 lb force with a safety factor of 3 | |||
*Actual pin requirement is only | |||
Revision as of 19:09, 29 July 2015
See results post - https://docs.google.com/spreadsheets/d/1QEP2lY5EdOeCjlH1s_MYqHCLYqDy4uDbdDqzyWPiYqo/edit#gid=1
and video:
OSE Microtractor Workshop from Ruth Dusseault on Vimeo.
Known Bugs
- There are tracks with links either 1/2" and 3/8". One track piece gets stuck some times. Need to grind drive cog to more taper of teeth. -7/29/15
- Track sections are difficult to weld. Flat bars can't be used, as a part of the links needs to have a standoff
- Machine height of 58" is too tall - and appears to be not marketable as far as a consumer good
Good Points
- Success metric - machine spins 360 degrees in place as expected.
- Torque of 7500 lb at 2 tracks is significantly stronger than industry standards.
- DIY build suggessful - track sections build with cutting, hole punching, and welding jigs.
- Pipe wrench bending of idler shape works on 1/4" steel plate
- Tensioner works as expected.
- A 1" pin on track sections - if we compare that to 3" cylinders where a 1" pin holds 20,000 lb - is sufficiently robust to hold 6000 lb force with a safety factor of 3
- Actual pin requirement is only