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Post by tronicgr on Nov 30, 2016 11:59:19 GMT
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Post by wannabeaflyer on Dec 1, 2016 21:11:03 GMT
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Post by wannabeaflyer on Dec 1, 2016 21:18:53 GMT
Hi Thanos this look very promising for my Dc linear actuators in terms of short sharp movements as in rumble strips and general road bumps and bad surfaces ,would this string pot setup work quickly enough to catch these movements . with my present 6 DOF sim platform the one area I think im lacking is the road vibrations I cant seem to dial that in with the AMC controller, need to sort the PID better but overall the platform is running well,
at the moment I have a 10 turn Pot connected to a GT2.5 belt drive to allow me to monitor the total travel length of my actuator being 350mm
one last thing one issue I have noticed now that the max motor speed is set to 75% is form time to time the during a simulation run , it will drop out and go to hold position at random times , is there a parameter I need to reset ( timing ? ) to cure this ..its annoying more than anything as I just have to hit drive button and away she goes like nothing has happened ??
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Post by tronicgr on Dec 2, 2016 1:08:12 GMT
Hi Thanos this look very promising for my Dc linear actuators in terms of short sharp movements as in rumble strips and general road bumps and bad surfaces ,would this string pot setup work quickly enough to catch these movements . with my present 6 DOF sim platform the one area I think im lacking is the road vibrations I cant seem to dial that in with the AMC controller, need to sort the PID better but overall the platform is running well,
at the moment I have a 10 turn Pot connected to a GT2.5 belt drive to allow me to monitor the total travel length of my actuator being 350mm
one last thing one issue I have noticed now that the max motor speed is set to 75% is form time to time the during a simulation run , it will drop out and go to hold position at random times , is there a parameter I need to reset ( timing ? ) to cure this ..its annoying more than anything as I just have to hit drive button and away she goes like nothing has happened ?? It sounds that the max speed of your motors is less than the potentiometer rate. This means the target is usually far and the PID doesn't have the chance to windup to negative target. Which is good but it will smooth out vibrations like you said. What you can do is increase P (PID) to make the drive more aggressive, this way you should get some vibrations. To change the timeout for the hold position go to the 6dof home position menu and increase the timeout setting to something big, like 90...
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Post by wannabeaflyer on Dec 2, 2016 21:04:29 GMT
Hi Thanos this look very promising for my Dc linear actuators in terms of short sharp movements as in rumble strips and general road bumps and bad surfaces ,would this string pot setup work quickly enough to catch these movements . with my present 6 DOF sim platform the one area I think im lacking is the road vibrations I cant seem to dial that in with the AMC controller, need to sort the PID better but overall the platform is running well,
at the moment I have a 10 turn Pot connected to a GT2.5 belt drive to allow me to monitor the total travel length of my actuator being 350mm
one last thing one issue I have noticed now that the max motor speed is set to 75% is form time to time the during a simulation run , it will drop out and go to hold position at random times , is there a parameter I need to reset ( timing ? ) to cure this ..its annoying more than anything as I just have to hit drive button and away she goes like nothing has happened ?? It sounds that the max speed of your motors is less than the potentiometer rate. This means the target is usually far and the PID doesn't have the chance to windup to negative target. Which is good but it will smooth out vibrations like you said. What you can do is increase P (PID) to make the drive more aggressive, this way you should get some vibrations. To change the timeout for the hold position go to the 6dof home position menu and increase the timeout setting to something big, like 90...
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Post by wannabeaflyer on Dec 2, 2016 21:08:14 GMT
Hi Thanos mega thanks for replying will try these tips and post a video soon just to show the progress that's been made thanks to your controller ,,,your a star ...
do you think the string encoder will function well for this type of actuator :-) Thanks good buddy
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Post by tronicgr on Dec 2, 2016 21:23:43 GMT
Hi Thanos mega thanks for replying will try these tips and post a video soon just to show the progress that's been made thanks to your controller ,,,your a star ... do you think the string encoder will function well for this type of actuator :-) Thanks good buddy The string potentiometer is designed for linear actuators for cases you can't or you dont want to mechanically add a geared potentiometer right on the motor gears on the lead screw. It's simple to attach on the outside of the actuator. Really useful for other type of actuators like hydraulic ones or AC linear servos.
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Post by wannabeaflyer on Dec 4, 2016 15:25:45 GMT
Hi Thanos cant seem to find the homing time out function in the AMC menu, im sure I have come across this before but seems intermitant whill trying to find it in the menu ? is there a listing of the AMC menus so that I can check which branch its supposed to be Please.
I have cranked up the P function of the PID menu its now at 50 and the heave rumble im after is still not quite there , is the a max value for the P value of the PID option.
am I looking in the right place for the Hold timeout ? should I be looking somewhere in the BFF config file ?
Soory for the NOOB questions but there is so much to learn now I have the system basically running Cheers Thanos
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Post by tronicgr on Dec 4, 2016 19:33:32 GMT
Hi Thanos cant seem to find the homing time out function in the AMC menu, im sure I have come across this before but seems intermitant whill trying to find it in the menu ? is there a listing of the AMC menus so that I can check which branch its supposed to be Please.
I have cranked up the P function of the PID menu its now at 50 and the heave rumble im after is still not quite there , is the a max value for the P value of the PID option.
am I looking in the right place for the Hold timeout ? should I be looking somewhere in the BFF config file ?
Soory for the NOOB questions but there is so much to learn now I have the system basically running Cheers Thanos You can increase the P and I and D values up to 254 (if I remember correctly). You can find the Timeout option under the "6DOF Start Pos" menu: motionsim.blogspot.com/2014/07/firmware-summer-updates.htmlI hope this helps Thanks Thanso
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Post by wannabeaflyer on Dec 5, 2016 19:14:58 GMT
YEEEEEE HAAAAA BABY lol :- well guys happy to report another milestone seems to have been cracked , I now have shaking and baking going on with my sim platform ,, the elusive heave rumble and road surface feed back seems to have come at last now im not so sure my floor will take the strain ..... OK tech details seems my PID settings were way off ( I did mention I had not changed the defaults ) anyways with my new pid settings and some minor tweaks to my BFF setting file Courtesy of @seattime once again ( mate Thanks for that ) the bastard rig goes like the clappers if anything I need to dial back the settings .. I will post my AMC settings and BFF config for any one interested . but have to say had to get down here and post this great news well for me anyways ) I will make a quickie video as well so show you guys that these actuator will work . Ok clamp meter measured max 99 amps at the supply output ( measured across the +12V lead) im guessing that ball park figure means <20 amps per motor going at full tilt.. I initially had PCars running in simulated driver mode then stopped sim and put my fat arse in the cockpit ( my driving is still crap so this way I figure I exercise the sim and STAY on the track LOL) Actuators were not screaming in pain and did not seem stressed ., alll actuator Motors were cool to the touch and the 2x32 controller were still luke warm, no burning smells of any element being cooked, and took the heavy breaking with me in the cockpit with no trouble.. I will admit these tests are only 5 -10 minutes duration so will give update when i'm capable of wringing the neck outta this platform hey my man @silentchill this will work mate no bullshit , you will not be disappointed ( no im not a salesman for Dimension engineering ) LOL yeah guys you know I waffle a lot but im buzzing at the moment CV1 coming after xmas will be icing on cake This is a Cowboy style Yahoooo sign off im going back to write down the settings PS still cant find the Timeout function in the AMC menus so the only issue i have seems to be the random return to hold issue that occurs from time to time during sim run
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