Controlling two linear motions of an object 1a
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- เผยแพร่เมื่อ 8 ต.ค. 2016
- This is called as Hbot mechanism.
Hbot = H-shaped robot.
Linear motions of orange object along X and Y axes are controlled by pink and green driving pulleys.
One branch of the black timing belt is fixed to the orange block, the other branch goes through it.
When pink and green pulleys rotate in opposite directions at the same velocity, the object moves along X axis.
When pink and green pulleys rotate in the same direction at the same velocity, the object moves along Y axis.
The green line is trajectory of a point on the object.
The mechanism can be used for 3D printers.
When the pink pulley turns P deg. clockwise (the green one is immobile) the orange object displacements are:
Along X axis: ΔXp = - Pi.D.P/720
Along Y axis: ΔYp = - Pi.D.P/360
When the green pulley turns G deg. clockwise (the pink one is immobile) the orange object displacements are:
Along X axis: ΔXg = Pi.D.G/720
Along Y axis: ΔYg = - Pi.D.G/360
Pi = 3.1416
D: pulley diameter.
Programming driving pulley motion to get desired trajectory of the orange object is not easy.
STEP files of this video:
www.mediafire.com/file/fh6i89f... - วิทยาศาสตร์และเทคโนโลยี
Your automations are wonderful. I congratulate you on the work, expertise and brilliance you have dedicated to these. Thank you for providing some very stimulating material.
Love these, very inspiring. You've got serious skill Mr. Thang.
your channel is stunning, thank you for sharing all of your videos
very nice!!!
Genius!
Hi!
How do you control the angle of the diagonal movement?
Only turning 1 motor does a 45 degree movement, but how do you get this , say 55 degree angle?
Thanks!
Please read the video description.
When pink pulley turns P deg. and green pulley turns G deg.
the orange object moves:
In X direction:
ΔX = (G-P)Pi.D/720
In Y direction:
ΔY = -(G+P)Pi.D/360
ΔY/ ΔX = tan(A)
A: angle of desired oblique trajectory of the orange object.
Solve these 3 equations to get P/G relation giving desired trajectory of the orange object.
Great animation of a mechanical concept - you have a good ability to visually present technical information! I've read through the comments, but still have a question on something that was addressed in one of the comments, but is still unclear in my mind. My question is whether the black timing belt is fastened to the orange block at 2 points, or 4 points on the block. I think the top part of the timing belt passes through the orange block, and the bottom part of the timing belt is clamped at either side of the orange block for this to work. Is this correct?
Yes. One branch of the black timing belt is fixed to the orange block, the other branch goes through it.
Thank you for your question. I have to improve my explanation in the video description.
excuse me sir
I think the formula should be
When the pink pulley turns P deg. clockwise (the green one is immobile) the orange object displacements are:
Along X axis: ΔXp = - Pi.D.P/720
Along Y axis: ΔYp = - Pi.D.P/360 -> - Pi.D.P/720
When the green pulley turns G deg. clockwise (the pink one is immobile) the orange object displacements are:
Along X axis: ΔXg = Pi.D.G/720
Along Y axis: ΔYg = - Pi.D.G/360 -> - Pi.D.P/720
do you think it is right?
Your Animation and Explanation are excellent! Would you mind if we embed this video on our website?
Please feel free to do it.
0:05 Something is seriously wrong with this concept/animation. It breaks the laws of physics.
How is it possible for the orange peace to move left/right on the blue axis?
The belts would need to get longer/shorter.
0:05 Look at the 2 top-left gears.
They work against each other. And the belt on the left side magically gets longer.
It can't work that way.
The belt is attached to the orange block at only two points, not all 4 as the visual would make you think. The two lower points are attached while the two upper points are actually the belt passing through the block.
@@allyouaskfor I know. It still does not work.
At 0:05 look at the two yellow wheels top left. They work against each other on one belt.
@@uhu4677 That is simply a mistake in the animation. The concept is not flawed and is widely used. For example: th-cam.com/video/QAYOdbfQY4w/w-d-xo.html
Thank you for the STEP files.
What is it with your equations? Turning one pulley moves the chart exactly the same amount along x & y (dx = ½*r*angle_rad).
This is the mechanism used in H-Bot 3d printer. Make a core xy mechanism please. What software / tolls do you use to create these lovely animantions?
CoreXY animation is under construction.
All videos in my channel are made in Autodesk Inventor.
This is not a core XY. For this design the belt is 4X+2Y long. For a coreXY there are 2 belts, each 2X+2Y long. This uses fewer parts but is more accurate.
Sir, can you tell me how the black timing belt is fixed to the orange object? I try to understand the moves following the travel of it and the text of the video but I don't get it. Thank you.
The orange object has upper plate. Two branches of the black closed belt are clamped between the base and the upper plate of the orange object by two hexagon screws
The video is false. It does not work like that.
Also visible at for example 0:05, if you look at the 2 gears on the top-right, which work against each other.
Excuse me sir, we have a prototype that uses the h belt mechanism. When turning only one motor the point doesn't make a 45° movement and one of the linear bearing is stuck, what is the appropriate solution onto this matter?
Sorry, I have no idea about your problem.
My simulation shows that 45 deg. motion.
There is no solution this simulation is fake.
At the orange block, the furthest part of the belt must pass through (or around) freely. The other part of the belt is fixed. Two of the yellow pulleys also turn the wrong direction in the animation.
Is there span length limitation for this design?For incidence, do we have to worry about the tensioning of longest span portion of the belt? Thank you sir!
Yes. Using double sided timing belts is a good solution.
@@thang010146 so you mean using both sides with teeth?
Also, I have seen a lot of 3D printer applications. Is this also been used on any industrial machines / applications?
Thanks sir!
Would this be usable as an XY-table for a cnc milling machine? Maybe with a chain drive instead of a belt?
I don't think so. Chain drive can not give precise motion for milling machine table.
You are right, i didn't think about how precise this would be. Thanks for your answer and all your great videos
I've seen some CNC routers with pretty good precision that use timing belts.
If I wanted to mount this on a wall, how would I do that without the motors getting in the way? What kinda of motors should I use? And can I program the, with arduino?
Use step or servo motors.
I don't know how to control the motors. Ask electric engineers.
@@thang010146 thank you!
Is it only one belt? and why do the inner wheels not turn when the object is moving on the x-axis?
Yes, one belt.
If the inner wheels turn the object will move along Y-axis.
Does the complete project provide the belt drive system?
This mechanism uses belt drive only.
sir in the orange Box ,how to use of the pulley belt
The black timing belt is fixed to the orange box.
This is a lot like the x/y motion system design in fusion’s f410 3d printer
Are there any other programs that can achieve this (prefabily free / opensource)
I know Autodesk Inventor only.
thang010146 thank you
Greetings Master what software do you use for simulation?
All videos in this channel are made in Autodesk Inventor, Dynamic Simulation.
@@thang010146 Lovely, thanks Master
How many engines do you need for this?
Two. One for the green pulley and one for the pink pulley.
Please read the video description.
CoreXY!!
Isn't this the basis of how CoreXY printers work?
Yes.
sir i am work on special purpose welding machine this video is very helpful
but sir i what to automatic controlled .
help sir..
Step motors are attached to green and pink pulleys. Their rotations are programmed.
thanks sir
Sir please share the program for driving pulley mechanism
This video was made in Autodesk Inventor.
@@thang010146 I have AutoCAD file so how can I drive the pulley ?Please help
I think AutoCAD does not support the simulation.
You have to use other softwares.
@@thang010146 which software?pls help
I have Auto desk Inventor so how can I move pulley mechanism?
네 이거랑같은 구조입니다
Wow, the "design my _____ for me, for free" leeches are all over this comment section! figure it out for yourselves. It's not that complicated. You might even learn something.