Team Bitza

**PJ-27** · 30th May 2013, 12:48

@Alex, Ziggy is something else! Have you seen it self right?

**Eventorizon** · 30th May 2013, 18:23

Originally Posted by PJ-27

@Alex, Ziggy is something else! Have you seen it self right?

Nope, I haven't. I have been looking but no luck so far.

**PJ-27** · 30th May 2013, 12:51

http://www.youtube.com/watch?feature...x-hiZzM#t=167s

Interestingly the rear arm appears to only have linear motion. It just slides back and forth with a pivot for the arm.

**mark_m** · 30th May 2013, 15:14

Here's a 4 bar lifter, Excel based calculator I made a while back:

4bar.zip

If its useful I could also add some force calculations.

**Eventorizon** · 30th May 2013, 12:31

An alternative use for our 50x100mm cylinder is a 4 bar lifter. I have been examining Ziggy, the US Superheavy weight. That makes things fly! Though the whole thing is built from Titanium and has 2 massive buffer tanks to insure a constant thrust which you cant really do in a feather but its worth a look!

**PJ-27** · 30th May 2013, 12:43

Thanks for the responses everyone, a great help!

@Marco, that would be a great help thanks!
I found Biohazard to have:
Top Bar is twice the length of Front Bar
Front Bar is twice that of Rear Bar
Where they attach is a differebt matter.

It's electric. The tricky parts are designing so that the thing will lay flat (at at least ear flat) when retracted, and have decent reach when fully extended. I figured to be decent at this scale the tip of the arm should be at least 30cm from the floor and from the robot.

@Ellis, cheers! Deciding height over reach is a tricky one.

@Jamie, that's a great help. Ignoring the right angle in the front bar it's length is 210mm, so;

Top Bar 360mm
Front Bar 210mm
Rear Bar 135mm
Lower Pivot Distance 235mm
Upper Pivot Distance 160mm

@Marco, could you possible animate this?

@Daliad, that's a great tool I used a bit to calculate how much torque I would need, but it's quite buggy and difficult to set up.

@Plargen, I believe Jamie has them all online, I'll have to trawl through.

**Gaseraki** · 30th May 2013, 16:34

Thats np PJ. Will try and do it tonight or tomorrow. Will need to quickly setup a rig for it. Maya really isnt the right program for this stuff but would give you a good idea of the motion it would do