Latest revision as of 19:16, 29 July 2015

and video:

Proofs of Concept

Track drive functions as expected, and 1/2" track links with 1" pins and 1.9" rollers indicate 10,000 - 20,000 lb torque rating for each track

There are tracks with links either 1/2" or 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. Streamlining of track build should involve using a 5-10 link jig to facilitate welding. Main difficulty lay in having to regrind track sections.
Machine height of 58" is too tall - and appears to be not marketable as far as a consumer good

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 2000 lb for pin bending with single cog drive because 3 teeth catch the chain at all times.

@@ Line 4: / Line 4: @@
 <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>
+=Proofs of Concept=
+*Track drive functions as expected, and 1/2" track links with 1" pins and 1.9" rollers indicate 10,000 - 20,000 lb torque rating for each track
 =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
+*There are tracks with links either 1/2" or 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
+*Track sections are difficult to weld. Flat bars can't be used, as a part of the links needs to have a standoff. Streamlining of track build should involve using a 5-10 link jig to facilitate welding. Main difficulty lay in having to regrind track sections.
 *Machine height of 58" is too tall - and appears to be not marketable as far as a consumer good