H-Bot Repeatability test
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- เผยแพร่เมื่อ 1 ก.ค. 2018
- H-Bot x,y Repeatability test.
Leadshine hbs507 motor driver at 5000 steps/rev.
Encoder set to 4000 steps/rev
GT2 24T Pulley = 208.33 steps/mm
Max. Speed in Gcode set to 450 mm/s - วิทยาศาสตร์และเทคโนโลยี
Beatiful! I love the low profile and compact footprint of the H-Bot design. Does GRBL need to be modified to support this? Any pointers on where I can find the appropriate FW/Config? Thanks
Awesome, fantastic work!
Sir can you give me the detail component that you use like type of bearing, timing belt, timing pully ?
Will you be continuing with this build?
What belts and pulleys are you using? What rpm are the servos spinning at? I think im going to use Clear path servos, they have a 4000rpm max
how many drivers did you use?Is the project available? I want to build a laser CNC.
are these belts with a metal core? how long did they work on such bends?
Воу воу брат, полегче. perhaps the pulleys for kah motors are small, or is there an emphasis only on the accuracy of movement?
I'm building a CNC laser C02 with the same belt system, my question is the movement of the X axis.
Nice!
how many drivers did you use?
CoreXY is a bit weird but understandable, but i dont get the H-Bot system... there is one continous belt if i look at your video... how does it controll the Y Axis? O.o
@ Roberto, there are two strong camps for this kind of motion control. As you know the tried and true CoreXY and then the very strong contender the " H-Bot systems ". I am in the process of building a draw-Bot and I started leaning towards H-Bot for many features they offer.
@@overlycranked8674 after looking into it a bit more I noticed it's pretty much the same. One longer belt vs 2 slightly shorter belts... The motion principle stays the same... So I don't understand that "holy war" that seems to be raging...
@@mongini1 I know this comment is a bit late, but I can explain a bit. The first system to be implemented was standard cartesian systems, like you see on reprap prusa printers. Then we get the H-bot which is what you see in the video. The H-bot works exactly like an Etcher sketch, the little toy with two white knobs that allow you to draw on the screen by twisting them. It uses one continues belt controlled by both motors, and connects to the hotend. The problem with this system is that it can cause a twisting moment on the gantry arm when the hotend is moved from left to right along the gantry arm. This is largely typically due to the belt only being connected to one side of the hotend mount (the front side of the plate in this case). Now, the simple reason that Core XY blew up is because the vast majority of hobby printers aren't as rigid as the one you see here. That means that the twisting moment actually leads to a measurable effect and can "rack" the gantry arm. H-bot is reliable, and if you're using strong linear rails mounted to a rigid frame, then it's all good. Core-xy though eliminates the twisting moment because you have two belts running in parallel, connected to both sides of the hotend. The twisting moments are largely canceled out. Fun fact, the heavy duty industrial machines that a lot of companies use have H-bot style motion.
Do you provide the electronics project?
Нема 34? или 23 кажутся такими крупными на общем фоне? В любом случае 3d принтер без сервомоторов не считается пацанским.
This was like going to a top of a hill, then run a marathon go back to the hill and you are still at the same altitude.🤣🤣🤣
Hbot are really hard on acuracy, as they tend to pull in diagonal.
You should give a try to double inverted hbot (you just need a second belt and an extra x-y. You can even connect the steppers in series (+x-x) (+y-y)
Hi John
I have already converted it into a Core XY printer, mostly course of Racking Issue when moving fast with some load on.
Now it is a Core XY printer th-cam.com/video/6lkhj1MUPm8/w-d-xo.html
@@MikaelKrog she is looking good !
@@MikaelKrog if you have access to a cnc Im working on a really nice dual remote quad gear extruder, it work if printed but work even better in aluminium. I have a video of the first version on my channel, and I will upload the new remote one in the next couples of days.
Thank you very much@@johnrockland18
@@johnrockland18 I have 2 CNC milling machines, one small Cortini M300A th-cam.com/video/I_FmiOA-ljw/w-d-xo.html and a big one Feeler FV-600 with 22 tools th-cam.com/video/bKyTepo4QQE/w-d-xo.html
Are you sure this is accuracy test? This seem to be repeatability test
Hi
Vyacheslav.
Yes you are correct, I need to change that.
I have also rebuild the machine to a Core XY instead of a H-bot. I had a small Racking Issue 0.1mm Z axis has also been mounted, but I need to mount a bed platform also.
Thanks for your reply
Best regards Mikael
@Michael Villanueva he literally just said he had 0.1mm racking issue even with the steel frame
Mikael, did you trace the source of the 0.1mm racking? Clearly your frame is not going anywhere. May be there is some play in those linear rail/housing systems?
А где тест?
You need to measure the delta's on the Z bed. A perfect XY gantry means nothing if the Z axis isn't leveled.