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Post by Trip Rodriguez on Nov 9, 2016 12:33:15 GMT
Yes sir PaulG100, you have been a great help. What is the issue you are having by the way, just out of curiosity? tronicgr any chance we can make a date to try to get my sim tuned via skype or similar? It's ready to go other than tuning, but 12 hours trying to do it myself taught me that I definitely don't know what I'm doing! I am tuning for VR, not sure if that's a problem.
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Post by paulg100 on Nov 9, 2016 17:06:35 GMT
"What is the issue you are having by the way, just out of curiosity?"
Ill try and make a video this weekend, maybe someone will have some ideas, as I'm out of em at the moment.
(apart from upping start frequency to 1hz which causes lots of lag and feels off in VR)
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Post by Trip Rodriguez on Nov 10, 2016 9:48:55 GMT
Thanks to some help from Ian at BFF I got my sim tuned well enough to enjoy a seven hour stretch of mostly flying (with lots of fiddling mixed in) in VR and no motion sickness!
I still need to do some work, but I'm happy.
Here is a short sample;
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Post by paulg100 on Nov 10, 2016 13:43:06 GMT
Good work,
can i ask on your vfd's what do you currently have
ACL DCL and B082 (min frequency) Set to?
Also what is min/max speed on amc set to?
Thanks
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Post by Trip Rodriguez on Nov 11, 2016 22:40:28 GMT
I'll check in a bit, but I believe ACL is .15, DCL .01 and B082 is .1
In that video I had almost no heave in my profile, trying to add that back now.
Still need to get my PID sorted.
Interesting note, when I turned up my carrier frequency from 7 to max the platform got NOISIER this time. Before I changed B082 to .1 turning carrier to max made it a good bit quieter. I did some experimenting and with B082 at .1 it seems least noisy with a carrier frequency around 5 or 6.
Trip
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Post by paulg100 on Nov 12, 2016 7:30:13 GMT
Thanks for the tip re carrier ill take another look at that, Yes a higher carrier produces more EMI.
If you've managed to get the platform running without the electrical jitter with a B082 of 0.1 then that's great! you should be getting near 1:1 to the motion cues from my experiments.
Even at B082: 0.5 (default) there is a allot of lag induced.
look forward to more vids
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Post by Trip Rodriguez on Nov 13, 2016 4:56:06 GMT
A friend who is very prone to motion sickness tried the sim tonight. This guy gets sick playing on a regular small monitor sometimes and he has never managed to keep my Rift on for more than five minutes before.
He flew my Waco for nearly an hour in the Rift, including wild maneuvers and a thunderstorm before he felt like he had to quit. He LOVED it! I figure the fact that he did so well on motion sickness means I'm on the right track and since he was the first person beside me to fly the sim it was great to have validation in his telling me how amazing it was to fly it!
I'm still trying to get the runway bump bigger without making it do too much I don't like. The biggest thing I'm fighting is the kinda violent abrupt motions in favor of smoother ones.
I feel like there is a very noticeable lag between initiating a moderately hard roll and the platform starting to roll. Any idea how I can reduce that or am I stuck with it? I think once I smooth things out better it will probably be ok.
Amazing how much different the movement looks in a recording than it felt in the Rift, kinda cool really.
I think that the nasty vibrations I get on certain moves is my #1 issue. At first I just thought it was movements that were very abrupt but after doing more reading on this forum I think it might go away mostly or completely when I get my permanent metal upper hex platform built and installed and I'm also going to try moving the actuator rods significantly closer to my torque arms.
Right now the center of my bottom heim joints is 3.75 inches from the outside of the torque arm and if I understood Stevant's thread correctly he found lots of improvement by moving these in as far as possible. I'm thinking about trying to knock that down to 2 inches or so.
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Post by paulg100 on Nov 13, 2016 9:44:19 GMT
"Right now the center of my bottom heim joints is 3.75 inches from the outside of the torque arm and if I understood Stevant's thread correctly he found lots of improvement by moving these in as far as possible. I'm thinking about trying to knock that down to 2 inches or so."
Will you be making the top platform larger to compensate for that? otherwise the arms will not be perpendicular to the torque arms.
RE abrupt movements, What is your PID at the moment? a higher P will cause more abrupt movements, allot of it may be due to PID tuning.
Also slowing acl and dcl would help with that, does it need to be that fast for flight?
Didn't realise you still had a wood top frame, the frame is almost definitely twisting so I think that is the first thing to address for sure.
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Post by Trip Rodriguez on Nov 14, 2016 4:03:51 GMT
I was thinking of doing it without making the top platform larger as that's what Stevant did I think and he seemed happy with the results. Since I dind't make my top frame yet I could make it bigger, but that might possibly lead to interference problems with my side consoles. Any idea how critical it is that the rods be parallel to the torque arms?
One thing that might be unusual about my setup is I want to use it extensively for both flight AND racing. Right from the start it has been a design goal to be able to switch back and forth between the two quickly and easily (under 5 minutes is the goal), so I'd hate to have to change VFD settings every time but I can if I have to. Hopefully I'll be able to do it all with software profiles.
I'm hoping to get the steel for my upper platform today, and have it installed by the end of the week.
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Post by paulg100 on Nov 14, 2016 21:50:28 GMT
"Any idea how critical it is that the rods be parallel to the torque arms?" no sorry
"One thing that might be unusual about my setup is I want to use it extensively for both flight AND racing."
same here, in that case i think its best to tune vfds for racing then should be able to slow platform with amc (MAX SPEED) and software profiles.
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Post by vicpopo on Nov 15, 2016 5:17:57 GMT
In addition to whar Paulg said you can also play with the gain P . If Fabi's tool is still useable ( Thanos reported some bug with bff sofware), you can create quickly 2 profiles ( race car and flight) and it takes less than one minute to download it into the amc. Or changing with the soft max speed and P it takes also less than 1 minute.
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Post by Trip Rodriguez on Nov 17, 2016 7:13:09 GMT
Got my sim taken down tonight to prep for the new steel top platform. I had been watching for my wood temp platform coming apart and it held together perfectly but what I didn't see was how badly the bolts for the top actuator mount had wallowed them out! A couple of the bolt hoes had more than doubled in size! Tons of play in those bolts then causing a lot of dancing around and rattling! It should be a huge change when it goes back up ready to take on the world.
I cut all my rectangle tube for the top frame tonight and it looks great. I hoped to at least make one of the 1" holes for a test run so I'd know if I needed an alternative option ,or just more hole saw blades, before going to town in the morning but I ran out of time. I'm really looking forward to trying to weld it all up. I've never used a stick welder and my very modest little bit of welding experience is years back This is my first time really MAKING something out of metal, rather than just fixing a broken thing so it's kinda satisfying seeing it come together.
The big hang up is my spacers. The material is round steel tube, 1" outside diameter, 1/2" inside diameter. I need to cut six pieces off it 1.5 inches long and another 6 pieces 2.5 inches long. I cut the first one, but just barely. I'm pretty sure my good saw's motor will burn up before I makes a few more cuts like that and that would be financially disasterous for us.
Looking at options tomorrow, a friend who might be equipped to do it and also getting it done by the metal supply house for a non inconseqeuncial fee.
It doesn't help that I really want them today! I want this frame welded up so things can start going back together in their new and improved way. Hoping to being back to giving friends demos maybe Friday and definintely Saturday. Very definitely need it up and running for the weekend after thanksgiving Saturday so I need to manage to put off everything else until this bit is done.
There are other improvments being worked on for the sim beside just the frame and hopefully I can get those things pushed as well for a satisfying full package.
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Post by paulg100 on Nov 17, 2016 14:18:34 GMT
if you want to cut mild steel get one of the cheap evolution chop saws, the blade goes through mild steel like butter and lasts a long time. just be aware that its not the most accurate, maybe +-2mm.
re the welding what thickness box are you using for the frame, 3mm?
Do a bit of research online and see whats available in your local area for rods, dont just buy the cheapest it will make life hell. id say for 3mm go one size down and run hot rather that buying a thicker rod.
avoid 6018's at all cost, there shite for most welds, 7013 runs much nicer and is more versatile in position
Also the welder makes a huge diff, what is the welder you have? a 180amp makes a massive difference in the quality of bead it puts down vs say 110
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Post by Trip Rodriguez on Nov 17, 2016 21:38:33 GMT
I'll have to get back to you on the welder stuff. I inherited the stick welder (and rods) from a friend who passed away last year and don't really know anything about them.
All my welders are Harbor Freight so not great quality. My own is a 230V harbor freight flux core wire feed but I'm out of wire. The ones I inherited from Rob are the 120V wire feed and the 120V stick welder, again ALL are harbor freight. I'll look at what rods I have and the specs on the welder but I'm using what I've got as far as that goes unless it's the 6018's you warned about.
Thanks for the tip on the evolution blade, I was wondering about those. I already cut my frame, about to start working on the drilling. As far as the 1" OD 1/2" ID spacers I contacted my metal supplier this morning and they are cutting them to spec for me, I can pick them up at noon tomorrow.
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Post by Trip Rodriguez on Nov 19, 2016 9:22:20 GMT
The metal frame is in! I also shortened the spacers on the torque arms to 1.5" and they are much thicker now.
After all this I still have the vibration/shaking/shuddering problem I'm trying to solve. I've been looking hard at Stevant's thread as he was struggling with exactly the same thing for a while.
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