rgordon
USA
Asked
— Edited
Hey guys,
Anyone tried something like this yet? This may be what I need to use for my arm motors.
High Power Servos
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Synthiam
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I would like for you to take a look at my idea for a servo mimic that I came up with. I t is different than the link I posted. It is listed later on in the thread on second page. I put up an idea for a servo mimic with several drawings. Wanted you thoughts on my idea.
Also thanks for the H-Bridge schematic. I would like to try that also.
now limit switches can be used ,but not neededalmost because using a feedback pot on turntable
from the feedback position you can set the limits in the micro code
Thanks for your input. I don't have any experience yet with micro-controllers and programming and this was just way to save money instead of buying expensive high torque servos. I still may try it just to see if it works.
I appreciate you looking at it.
code i am talking about is scripts in EZB board ,and me or anyone else can help with that
i designed h-bridge design and pcb boards all info in zip file,made this design awhile back and sold many boards if anyone needs to buy the boards let me know,more that buy the boards the lower the cost to have it made ,boards are in 2 parts ,main reason is that the board is universal
logic circuit on one board and pwm h-bridge on another rated at 60 amp cont,but you can easy remove mosfets to save money,remove 4 of the 8 mosfets give you 30 amps
i dont get money from this and dont need it
HBRIDGE.zip
files in bmp and sch and parts list
To answer your question about bending the waist.
I am going to have to take some pictures this weekend and start my own thread in Project Showcase. I made it pretty cheaply, and if you look at the pictures it is easy to figure out, but you will see that it is very hard to describe without looking at it. *confused*
yes bending the waist is very easy done it on a few robots ,not hard or high cost ,with already made parts or easy to make parts,mostly depend on the weight you need to bend and that would the torque needed to bend and return,
bending is very easy but returning needs alot more torque
on the h-boards i am selling adding a special stall and what i call under stall (i guess it can have a better name)
stall is easy its when your robot bumps into something or a gear gets jammed and you could burn out the motor or h-bridge
now on under stall.it when your robot goes on to a carpet or some thing and motor keeps spinning and does move there is a way to detect that
both conditions you can have to shut down the motor or go in reverse or turn off the robot
as you can see i love designing circuits 20 hours a day ,and sometimes think about when i am sleeping and passing it free to others
If you are still interested in how I am making my robot bend at the waist, I have pictures
here.
It is all cheap hardware.
if you have a bigger robot,look at windshield motors very high torque
and i use a h bridge connected to a FUTABA S3003 BOARD ,i use this for my main robot arms to each lift near 50 lbs may be more,very high servo's
If you have occasion to balance the center of gravity of the robot arm with the axis of the servo (it may be impossible at times), but at least put some weight that is more useful patra balanced, this helps to reduce torque servo, here are some ideas that I implemented in my project, I hope some will be useful.
Big servo
Thanks for the pictures of the waist mechanism. It gave me some ideas
I like your RAD 4.0 robot. He's cool! I would like to use this kind of setup for my robot arm. Would you be willing to sell me a h-bridge rated for 30 amps connected to a FUTABA S3003 BOARD so I can control my dc gear motor like a servo? I would like to test one first then if it works out I would buy more from you.
30 amp h-bridge
i know i have one somewhere for a lower price
here is one cheaper rated at 30 amps
low cost 30 amp h bridge
and dual 50 amp bridge
dual 50 amp h bridge
mine are in robots
way you asdust it is set it for 1.5ms and adujst pot till motors dont move,mostly near center value of pot witch is 2.5 k ,same with 2 resistors 5.2k divided by 2 = 2.6k or using 2.4 k 's
mostle need to stay near 5k value when selecting two same resistors ,another name its called is 'dead center"