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Atlas arm, bouncing elbow


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#1 brett.mayfield


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Posted 07 October 2013 - 07:27 PM

Hey yall


I recently outfit myself with an Atlas arm, my last few arms were G40 and G50x

First off, the arm is amazing, but we already know that.

However I am experiencing the result of something that may be too good about the arm:


The elbow has so little friction that it is actually laterally bouncing against the lower arm, which is translating into tiny "taps" on the sled with almost every step.

It is as if the inertia of the upper arm is carrying it away from me, then my foot lands, and the lower arm catches up, thus the tap. This is somewhat overexplaining it, but its how I imagine it. I am trying to get a video of it, but its a little hard while carrying the sled, but Ill update later when Ive devised somethin.


The post is loosened so that the Atlas "wrist" can move freely (I have also tightened it with no change in elbow performance)

The sled weighs in close to 39 pounds and I am using two grey canisters appropropriately tightened for the load.


The G-series arms have great elbows, but under load there was a bit more friction, so it took some effort to articulate the elbow, thus it wasnt bouncing.


Is this a result of my operating, stepping, looseness in the arm...? Any information is helpful


Have a good one



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#2 RonBaldwin


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Posted 08 October 2013 - 07:23 AM

Smoother walk or softer bumper? My arm does it while running...which I try to never do at all costs
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#3 Robert Starling SOC

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Posted 08 October 2013 - 01:35 PM

Have someone video you and the arm and send it to Jack and team at GPI right away. They will be very proactive if there is anything wrong with the arm.



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#4 brett.mayfield


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Posted 08 October 2013 - 10:49 PM

After speaking with Jack and trying out differrent operating positions, I think that I am just on the shallow side of the learning curve with this new arm. What I probably need to adjust is the position of my gimbal hand and open the arm up a little bit.

For the time being I am tryin out some felt padding on top of the existing bumpers. Ultimately this is probably a poor crutch and I want to learn past this but it is a good temporary solution and has cut down the bump sensation by at least fifty percent.


Jack and the Pro team were very quick and helpful. This is an arm unlike any other and its really beneficial to revisit the basics while learning my way into some new gear.

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