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Mole junior sidearm


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#1 JD Hartman

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Posted 02 September 2010 - 06:29 PM

Anyone know the weight capacity of the Mole or similar junior sidearm? Reference: http://www.msegrip.c...oducts_ID=24169 No max. weight specs in the MSE catalog, nothing listed on the Mole website either. DP wants to mount a 50lb fixture on it. The offset arm would be clamped to a speed-rail upright, mounted between the floor and the roof truss. A telescoping hanger would be a better idea, but we don't have (can't get) one. One possible option is rigging a junior stand, upside down from the roof truss. Suggestions?
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#2 John Sprung

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Posted 02 September 2010 - 06:56 PM

The effective lever arm looks to be about 12 - 14", which should be OK in terms of it not breaking and falling. But definitely chain safety the whole mess to the truss above. My concern would be more with the total twang of the system, seeing the light move around with the vibration of the speedrail and arm.




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#3 Michael E Brown

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Posted 02 September 2010 - 07:49 PM

I also think you would be ok with the sidearm. You probably have to worry more about the speedrail flexing from the torque than the steel sidearm bending. You could slide a fitting onto the speedrail a couple feet above the sidearm and use a ratchet strap to take some of the weight from the sidearm if the flex is obvious.

Alternatively, I have rigged a section of speedrail straight down and put a speedrail to junior reciever adapter on the end. Either drill one of the set screw holes into the speedrail (so the screw goes into the speedrail instead of just pressing against it) or again use a ratchet strap to ensure the fitting does not slide off.

Of course, snug safety cables on everything.
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#4 robert duke

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Posted 03 September 2010 - 06:41 AM

I also think you would be ok with the sidearm. You probably have to worry more about the speedrail flexing from the torque than the steel sidearm bending. You could slide a fitting onto the speedrail a couple feet above the sidearm and use a ratchet strap to take some of the weight from the sidearm if the flex is obvious.

Alternatively, I have rigged a section of speedrail straight down and put a speedrail to junior reciever adapter on the end. Either drill one of the set screw holes into the speedrail (so the screw goes into the speedrail instead of just pressing against it) or again use a ratchet strap to ensure the fitting does not slide off.

Of course, snug safety cables on everything.

what about steel pipe for the floor to ceiling bit and using a speed rail cross and bit of speed rail to Junior clamp? that take all worries out of the weight bearing as the steel and speed rail are far more than rated for it.
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#5 JD Hartman

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Posted 17 September 2010 - 12:47 PM

Ended up using the Mole junior sidearm attached to two 10' lengths of speedrail, overlapped and spliced with cheeseboros, overall length 16'. It was attached at the bottom with a speedrail flange, at the top to a length of Unistrut bolted across two roof rafters. No noticeable bowing of the speedrail even with the 50+ pounds of weight cantilevered from it. The speedrail quickly became the home for diffusion frames, bottomers and siders. Sorry for the poor photo:
Posted Image

Edited by JD Hartman, 17 September 2010 - 12:47 PM.

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