This will do

[opabinia]

until bottleimp sends his extra-eeevil rotating version:

Thanks to industrialsteve, the skilled machinist.

The 1" steel pipe is center-suspended, meaning that any asymmetrical pull will destabilize the movement. There will be no cheating on these pull-ups.

That rope is theoretically strong enough to hold me up single-stranded. I doubled it over, just in case, because plenty of tensile strength is lost in knots and such. Still looks kinda thin; that gives me extra motivation to go slow and tight. Fortunately, this is a grind move, not a ballistic (pronounced "potentially rope-snapping") drill.

[...]

Woo!

Comments

[fire-faery.livejournal.com]

Nice. I'm sure building it is not too hard, is it?

What kind of rope are you using for it?

[rojagato.livejournal.com]

It also holds me up, and I did a good amount of bass-like thrashing (omigod, omigod, why doesn't my arm turn that way?) so I think it's patent.

[lepidosiren.livejournal.com]

Easy project: 4' of 1" heavy steel pipe, with a 3/8" (I think) hole drill-pressed right through the middle. String it up and go. I used 3/16"(?) braided nylon rope.

[lepidosiren.livejournal.com]

AAAAaa! You got Species germs all over it!

*wakes up*

[bottleimp.livejournal.com]

Quick, the Febreze! Or the Lysol or those Scrubbing Bubbles guys!

I'm not sure if I said before, but you may not find it as hard as one might think, esp if you have emphasized full-range, grinding, hi-tension pullups before.

It's the kipping Crossfit guys who'd get a rude, rude surprise, or the cheatin,' unwashed masses.

it will keep you honest, though. And you can keep the one you made as a back-off for when mine truly kicks your ass.

[bottleimp.livejournal.com]

I just noticed that you're using a textile rope, not steel cable. Beware of the edges of the hole slowly wearing/cutting through the rope. Check before every use, blah blah.

'Cause it'll be right above your crown when it snaps, and your weight, plus your pulling arms, as you fall will bring it down really, really hard. On your melon.

[lepidosiren.livejournal.com]

Correct. I'll swap in the steel cable once I get the right hardware for it. (Had it around the house, couldn't find it, improvised.) This will happen soon, because I like my cranium.

[bottleimp.livejournal.com]

Even though it's got those weird pointy areas on it? At least mine is round, except for the big-ass crack running across it.

[lepidosiren.livejournal.com]

Yeah, mine's a bumpy skullcap, but it's pretty symmetrical, so I'm cool with it.

[fire-faery.livejournal.com]

Good choice of rope to use for the pipe. Good luck with it. :-)