Maasdam pulled to the max

[Muggs]

A simple test. Easy to overload, but I was really trying. Without the load cell it would have been pretty obvious to me that I was overdoing it. If you figure you need more than 1500 lbs, I would pair it with a block or pulley for a 2:1.

 

[96coal449]

I've still never used one. Discovered them 20 plus yrs ago, when I first started doing tree work.
Been using captive progress 5:1s

I've always wondered how the Maasdam preforms.

 

[southsoundtree]

The MA of a Maasdam Continuous Rope Puller is a higher ratio than 5:1.

 

[flushcut]

Am I seeing that correctly, that as you hit max tension is was bleeding pressure?

 

[Shadowscape]

I think you need a new coat.

 

[Treemuel]

One question I’ve had about the Maasdam is that it’s rated to 1500lbs, but the ABS of 1/2” promaster is 5700lbs, so aren’t we exceeding the WLL of the rope when we fully load it? Does this mean we just accept fewer cycles to failure on that line? Is it a reason to always backup the Maasdam when failure can lead to bad outcomes?

 

[Muggs]

Am I seeing that correctly, that as you hit max tension is was bleeding pressure?

Seemed like everything just continued to stretch. You wouldn't recognize it without the load cell on there.

 

[flushcut]

Continued to stretch or ever so slight slippage pound by pound thru the sheave. Either way thank you for your work,

 

[27RMT0N]

On the first page of the manual:

SPECIAL SAFETY FEATURES:

1. Hook starts to open when device exceeds weight limit.

2. Latch “Pops” when weight is exceeded. At this point remove the load from unit.

3. Handle bends to side when unit is overloaded

Interesting to see the numbers, and that it failed exactly as designed.

I've also replaced the stock hook with a carabiner, in order to make it easy to attach to an UltraSling. It is easy to feel and gauge the amount of tension and how close to the limits you are with the puller, so I'm not at all worried about losing that small feature/failsafe of the stock hook.

 

[Bart_]

1 cm sheave radius to 10 cm handle length in screen shot pic says approx 10:1 advantage ratio

Props on video recording the load display. Gave a little extra insight into rope "settling". I encountered settling or creep trying to set up a zip line once. tighten. sag. repeat

 

[southsoundtree]

@Muggs

I would suggest uncoiling the rope and flaking it down the entire length. If the line parts on the near side to you, you are in the whipping zone. As well, I would wear my face screen down and not expose other extra sensitive parts to the particular recoil zone (groin level).


I had to do some max pulling of some logs, long, long ago. I pulled from behind a sheet of plywood. I felt much safer.

 

[Muggs]

Stepping over the tensioned line was dumb. I laid that rope on top to feel "safer", but when I ended up cutting the line at the end (off camera), that rope shot out of there like the old tablecloth under the dishes trick. I would definitely consider using a prusik cord if you want to weight down a line like that, just to make sure that the weight actually does its job....

 

[flushcut]

Stepping over the tensioned line was dumb. that rope shot out of there like the old tablecloth under the dishes trick.

And the Muggs are still standing! Lol

 

[knudeNoggin]

It would be wise to tie off any of that stuff that might be
launched at supersonic speed! --with something that
"shouldn't have" broken doing so, and suddenly that
load cell & other metal parts are in rapid transit.

*kN*