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| danny_galaga:
Just wow :cheers: |
| bobbyb13:
Awesome all around. Hadn't even considered how some flight games would quaify also. I'm a composite guy so I automatically start thinking foam and fiberglass for places that would be fragile. Some Divinycell with the right amout of epoxy/fabric lamination in the right spots would suit well I think (and maybe could be easier than metal? Certainy lighter.) If it required some give to keep from stress destruction then regular old woven glass would suffice, but it really would be fun to lay up some ridiculous aramid stuff if it wasn't too stiff for the application. Really lookng forward to future updates on this. One of the coolest things I've seen in a while for sure. |
| RandyT:
--- Quote from: danny_galaga on April 28, 2021, 09:38:09 pm ---Just wow :cheers: --- End quote --- Your project is way cooler, I only have a couple of feet to the ground if something goes wrong :cheers: --- Quote from: bobbyb13 on April 29, 2021, 12:05:11 am ---I'm a composite guy so I automatically start thinking foam and fiberglass for places that would be fragile. --- End quote --- Composites are definitely cool. I even considered carbon fiber for the tubes, but I have no first-hand experience with the mechanical properties of these new materials, so I punted and went "old school". Thin walls, crush strength and rigidity are a plus, and dollar for dollar, you just can't beat steel. As for the platform, the 80/20 rigs are super rigid and sturdy. The extra cost is made up by having them be simple to construct. But there's no denying that they fall way short where appearance is concerned. Fiberglass (or similar) is far more versatile when one wishes to flex their artistic abilities. |
| Howard_Casto:
So what's the weight limit on that bad boy? I designed my rig so I could mount the whole thing on a u-joint and turn it into a motion rig further down the line but honestly it's pretty damn heavy now. Not sure if anything could move it plus my fat ass. |
| RandyT:
Having not done any controlled testing on a single unit, I'm not sure I can accurately speak to weight capacities. The rig itself is pretty heavy. Rough estimate of the current configuration would put the wood/MDF platform at about 50lbs, the metal frame/seat is about 75lbs, subwoofer 30lbs, wheel and pedals 25lbs. With me sitting in it, the total would be somewhere around 340lbs. Before I changed things, there was very likely an additional 60lbs on the front of the unit, (50"TV, PS4, chipboard TV mount, amplifier, etc.) and that didn't seem to slow it down any. I almost think that the 110v power I am currently using, would kick a breaker before the weight would affect the mechanics. My actuators use internal components similar to units which claim 150kg ratings per actuator, and based on the weight distribution of my setup and what I have seen (felt), I'd say these could get pretty close to that. My mechanic buddy is a large guy, and I expect he will be over soon to give it try. I'll know more then :) The thing to keep in mind is that a 4 (or 3) actuator setup in this configuration is carrying the weight of the entire rig. It's known as a 3DOF system. There are other 3DOF configurations, which trade heave and limited surge/sway for stronger traction loss, but heave was way more important to me and I can always upgrade to 4 or even 5DOF if I decide to. However, if you just want to get a rig in motion, a well-placed universal joint at the point of balance (with the rider seated) will carry most of the weight of the rig, and only requires 2 actuators at the rear to achieve pitch and roll (2DOF). The actuators don't need to be extremely powerful in this configuration, as they operate in a "push-pull" fashion, with gravity assisting past the center point. If this is what you had in mind, I don't think you weigh enough to stop it, unless your actuators were very small. Some (probably smaller) folks have even successfully used modified wiper motors to move this type of rig. |
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