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Marten de Groot posted an update 8 years, 1 month ago
So, the CS238MG ServoAdapter production is done for the Right Hand 🙂 Next production are five Servo Pulley sets….
Here some pictures to show the difference between the servo weights… The MG996R was my first choice for the InMoov hand. The CS238MG servo weights including a mounted servo-adapter 30gr. less as the MG996R ! So if I will use these CS238MG servo’s for my InMoov hand, it will saves a 150gr. of weight 🙂 I think when I’ve finished the new…[Read more]
They may save weight but they may not be strong enough for the inMoov hand… The hand is not the same as the finger starter. There is a lot more friction on the push/pull finger mechanisms. The servos need to work much harder than the simple finger kit… However, let us know if they work because less weigh is always welcome…
Hi Richard, I’m almost sure these smaller servo’s are strong enough for the Hand. (don’t forget the special pulley which I’m using!) The spring which I’m using now, is perfect to start. If needed, I can use a stronger spring to get more torque. I hope to show the results this weekend 🙂 My goal is minimum to hold a softball or a bottle of…[Read more]
Sounds good… looking forward to your results…
If you like to print my new Finger_Starter kit including the new pulley’s, here you can find all the files 🙂 http://www.thingiverse.com/thing:1794206
Have fun… 😉
I will use your idea in my Inmoov Rigth Hamd
Thanks Rodolfo,
Yesterday I’ve changed the servo-adapter to V2 ! http://www.thingiverse.com/download:2803246 These are easier to mount to the CS238MG servo.
I will install the new servo’s tomorrow in my Right hand… So hopefully this weekend I can make a good video with all the results. And I will make a Step by Step “How To”.
If you have…[Read more]
Many Thanks Marten, I wait impatiently your Video, and your “How to”. It’s a very good job
Marten de Groot posted an update 8 years, 2 months ago
Today I finally received my smaller servo’s 🙂 https://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=51891 After printing a servo-adapter, to mount this smaller servo in a standard servo place… I made some tests with the new pulley and it looks all great ! The current use stay’s very low, even when I’m holding down the…[Read more]
Here two views from the pulley which I’m testing with the Finger Starter Kit V2 🙂
When the Finger moves to the Open position, the pulley is pulling with the small circular side. And when the Finger moves to the Closed position, the bigger oval side is used to pull the Finger… The servo makes a turn from 0 to 180, that’s way I can use a…[Read more]
I want to test these pulleys for sure! I’m guessing it will be also okay for our servos HK 15298 which have a restriction from 0 to 90 degrees.
Hi Gaël,
For a 0 to 90 degree turn, I need to make them a bit bigger ! These are now designed for 0 to 180 degrees. (please check your dropbox ! 🙂 )
After some tests, I will upload them to Thingiverse.
Here a video from the new Finger Starter kit V2… The servo current use, stay’s very low during the test, sometimes it’s passing the 0.26A during a start. (I’m still waiting for the new servo’s, so a second video will come soon !)
Regards, Marten
Wouuii video great Martens.Did you use your carbon filament?
Thanks Gaël 🙂
Hahaha, yes I’m still using the same Carbon Finger. I didn’t print more Carbon Fingers yet…
Finally the Arduino fits well in the updated FingerStarter_Kit. (see picture) The new pulley and adapter for the small servo also fits well.
I need to say….. I’ve found a other servo, which is a bit bigger and has 10gr more weight The good thing is, a standard pulley like Futaba will fit. And it has 2,1kg more torque as the small…[Read more]
Very cool Marten! Once the finger is assembled, a little video will be nice to see!
Thanks and yes, when all is running fine together…. I will share a “little” video 🙂 I think this will happen, when I get the new servo’s because of the fit to the pulley’s. I hope to get them next Tuesday.
when trying to reduce the forarms weight – did you experiment with getting less weight from the printed parts too? Just had a chance to look at a fiber enforced part at an exhibition. It had a thin layer of fiber on top and bottom of the part (needs 2 extruders) but showed impressing strenght.
Hi Juerg,
I hope to save some weights with the new servo’s. They have three times less weight then the servo’s which I’m using now. And the servobed will be smaller.
About the printing parts. I’ve done one finger with Carbon fill and is very lite. I’m only not sure enough, if this is strong enough !
how did you print the carbon item? Layer size? Perimeters? Fill? what tensions are you using? did you try to reduce friction of the tensions?
This is what I’ve printed yesterday, it needs some smalle updates to fit the Arduino better 🙂 When this all fits well, I will share this @ ThingiFirse including the new servo pulley !
Hey Marten, that seems like a great modification. I have a question if you have a moment, since you designed the nerv boards. I have one servo (Rt arm omoplate), which when connected to the nervo board, gets hot and eventually burns when connected to the nervo board. The servo works just fine on a tester etc. I have seen in the tutorial, the…[Read more]
Hmm, it sounds there is something else happen with your servo connection. If there is a shortcut between the Arduino shield and the small PCB, the flat-cable will start getting hot ! Please double check if there is no connection between servo outputs 10 and 11.
If possible could you send me some pictures from your boards?
Thanks for trying to help me. I sent images via pvt email.
Hello Jaideep,
Please read this post from @juerg
An error in a script and an unreachable neck position – just burned another HS805BB so badly, it burned a hole into the case and I can still smell the odor of death when entering the house.I have added now readjustable fuses for all of my large servos (PFRA 160, Reichelt.de).Hope this prevents future smoke!- juerg (@juerg) July 24, 2016
Give it a try and see if this will solve your problem.
@juerg Which servo’s are you using in combination together, which gives you this “Jitter” problem ? Do you have a oscilloscope ? If yes, could you make and share some screenshots, when you…[Read more]
Today I’ve printed a first updated FingerTest plate, including a spring which I’m using as a mechanical Servo-Safer. See pictures…. And tomorrow I hope to test the new 2.5kg servo’s, this depends of the servo’s will be delivered 🙂 I can’t wait….
Hello Marten, Very nice module for a Finger Starter!!! There is no doubt that the servo of 2,5kg will work because even a small SG92R works. With the Finger Starter there isn’t much friction. But such servo will burn for sure if used in the hand. The friction is far greater in many ways in the hand, that is the reason even a MG996 of 12kg Torque…[Read more]
The spring main function is to safe the servo mechanical (there is no direct blocking anymore). And including my servo pulley’s, the finger “close position” gets a smaller arm length ! So this safes a lot of energy use from the servo, when the finger is in his “close position” 🙂 I’m almost sure this spring setup is enough to hold a…[Read more]
Hello InMoovers,
Last weekend a good friend and me where asked to come to the “Mini Maker Faire” in the Netherlands. http://www.eindhovenmakerfaire.nl/?lang=en We where there “as builders” to talk with people how like to build something like InMoov. At our stand, we shared some more projects from https://www.wevolver.com/home/
During this wee…[Read more]
Hey Marten! Great pictures, I hope the mini makerfaire was a lot of fun!!
Thanks Gaël and yes it was “a lot of fun” 😉
Dominique's profile was updated 8 years, 3 months ago