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Post by Trip Rodriguez on Sept 22, 2014 2:51:50 GMT
Update: The motion sim is essentially finished! ![]()  UPDATE: This project is back underway as of August 2016! Who was it that said I'd better finish it quick before I got married? Seems you were kinda right, almost two years went by before I got back to it! Greetings all. Some of you may have seen my previous post on the 3/4DOF "BFF" project I was working on and noticed I deleted it. The reason for this is I decided to go for broke (literally broke!) and go for full 6DOF. I have ordered the motors, gearboxes, and inverters that were used for this build: motionsim.blogspot.com/2013/05/6dof-platform-photo.html and I expect them to arrive tomorrow! Much to my surprise the package is almost 700 pounds! Tomorrow I expect to start building the hexapod once I've got the motors and gearboxes assembled. I still need to find appropriate parts for the arms and rods for a good bargain, my credit cards are pretty much maxed from the parts I already bought =O My honeymoon is in less than two weeks (Oct. 3rd - 10th) so there will be a lack of updates from me during that time. I hope/plan to have all needed parts ordered before I leave so I can get the platform moving as quickly as possible after I get back. If anyone has good suggestions for inexpensive options for the rods and crank arms let me know! I'll post pics of the parts and project as I go along. Trip |
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Post by Trip Rodriguez on Sept 23, 2014 6:34:34 GMT
Today the motors and gearboxes arrived. I installed the motors to the gearboxes and cut 3/4" plywood plates to mount them to. I laid out the plywood and the drive units in approximately the correct orientation and spacing to get rough measurements of the base. Next I'll be attaching the plates to a 2" x 4" frame to get them up off the ground and stiffen them. After that I will mount the drives to the plywood plates with bolts from underneath using large washers or maybe fish plates. The plan is to build as much as possible with wood to keep cost down, but if I have structural issues I do have a welder so I can use steel if I have to. I ordered the rod ends and sleeves tonight and they are shipping from within the US so they should be coming soon. My inverters will be arriving this week as well, possibly tomorrow. They were delayed a little bit by a train derailment according to UPS. I still need to find an economical option for the crank arms, so far I haven't found a cheap option.    |
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Post by tronicgr on Sept 23, 2014 20:08:12 GMT
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Post by Trip Rodriguez on Sept 24, 2014 0:29:12 GMT
Hmmm... I'll have to figure something out. I've got some ideas but the trick is going to be figuring out how to do it cheap. I also need to order wires, I saw a post about shielded wires but not sure what sizes and lengths I need or how many.
Got a package today, I assume it is the inverters but I haven't had a chance to open it and won't until tomorrow. I'm going to be asking for help on figuring out wiring asap, I'll get pictures of the inverters and motors hook ups to refresh your memory so you can give me some instruction =)
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Post by tronicgr on Sept 24, 2014 1:29:39 GMT
Hmmm... I'll have to figure something out. I've got some ideas but the trick is going to be figuring out how to do it cheap. I also need to order wires, I saw a post about shielded wires but not sure what sizes and lengths I need or how many. Got a package today, I assume it is the inverters but I haven't had a chance to open it and won't until tomorrow. I'm going to be asking for help on figuring out wiring asap, I'll get pictures of the inverters and motors hook ups to refresh your memory so you can give me some instruction =) |
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Post by Trip Rodriguez on Sept 24, 2014 7:45:37 GMT
Thanks for that Thanos, I posted over there and I'm sure it will be helpful. Do I need external braking resistors with these driveswarehouse.com/p-2525-wj200-007sf.aspx or is the braking built in adequate without an external resistor? |
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Post by tronicgr on Sept 24, 2014 17:37:42 GMT
Its better to use braking resistors, so you can decrease the ramp up, ramp down times for the motor acceleration in the VFD settings. That will allow better stability on the positioning as well passing higher frequency commands that could be used for vibration (running a car over the red/white curb on race tracks for example)  You can ask stevant for info about the 300watt ones he got recently. |
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Post by stevant on Sept 24, 2014 20:40:12 GMT
Here are the ones I purchased on Ebay: They are 300w 200ohm Trapezium Aluminum Shell Braking Resistor They are $23.90 a piece  |
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Post by tronicgr on Sept 24, 2014 20:44:04 GMT
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Post by stevant on Sept 24, 2014 20:58:05 GMT
Yes....like that one. |
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tino
Junior Member
Posts: 71 
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Post by tino on Sept 24, 2014 21:43:12 GMT
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Post by Trip Rodriguez on Sept 25, 2014 2:29:34 GMT
Thanks guys, I'll get those ordered asap. My wife had a blowout on her car today and like I said I pretty much maxed out my credit cards to get the motors, gearboxes, inverters, then added Heim joints and tie rod sleeves ont top of all that. Now I have to order a pair of tires so I might not be able to order any of the rest of my parts for a week or two! I think pretty much all I still need is shielded wiring, the resistors, a bit of hardware, and the crank arms.
Thanks Tino, I was actually looking at similar roller chain stuff myself until I decided to take the plunge and play with the big (6DOF) boys =)
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Post by Trip Rodriguez on Sept 25, 2014 5:57:12 GMT
I got my motors and gearboxes mounted to their platforms today. I will still be adding end pieces to fill in those gaps in ends and stiffen the bases. The angled parts at the corners are not permanent, I made them so I could get the bases all spaced properly before continuing work. I need some lumber before I can do much more and I'm also waiting on clarification on the upper platform dimensions (Fabi's dimensions) and more info and drawings from DoctorD from the x-sim forums who is generously helping me out with the crank arms (http://x-sim.de/forum/viewtopic.php?f=37&t=1599&start=30#p14374). Other things on the list are figuring out what I need to order for (shielded) wiring, figure out hardware for attaching the Heim mounts to the upper platform and crank arms, and figuring out how I'm going to pay for the braking resistors and the supplies for wiring the 220V circuits needed to supply my inverters =). Fortunately my father can do the wiring once I get the stuff.  |
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Post by Trip Rodriguez on Sept 30, 2014 2:52:35 GMT
I'm busy getting ready for my honeymoon trip this week but still hoping to order parts before I go. Don't expect to hear too much from me until after I get back on the 11th (October) but things should really move along pretty quickly after that!
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Post by Trip Rodriguez on Oct 13, 2014 3:02:44 GMT
Alright I'm back from my honeymoon and anxious to get back to work on the motion sim! Right now the main things I need to figure out what wiring and potentiometers to order. I need shielded wires right?. What kind, what quantities, and from what source? What about potentiometers, any suggestions on what kind and where I can get them for a good price? I have two of these www.ebay.com/itm/111230650995_trksid=p2059210.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT brand new never used that I bought when I was planning to build a 2dof rig. If those are good I can just order four more of them. Any advice on this stuff would be appreciated. I hope to have some small progress to show within the next week or so on constructing the base. |
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