August 17, 2013 at 11:31 #918
Hello ,ladies and gentlemen:
I am now building the Morgan,but i meet something wrong. The 2 big drivewheels is too big and my Mendel(it printed the 4 Morgan arm successfully) can’t meet the requirement.My little Mendel’s print scale is like 175x175x130,maybe a little bigger,every time I print, I failed.It drives me insane,so is there anyway to make a Drivewheel,i would like to try anything.One more question, what’s the pully’s scale,12 teeth for GT2?Or T2.5?
August 17, 2013 at 14:26 #920FigParticipant
I have no idea how to modify your little Mendel to print drive wheels, but I’m sure all type of pulleys are OK, since I’m using MXL pulleys.
August 18, 2013 at 16:35 #929
Hi @Fig . Yes，a real Chinese student from China.Nice to meet you, haha. Back to topic,now I using the worm gear(the ratio,arm drivewheel and motor pulley, is 30:1 now,I guess the ratio of original Morgan is 15:1 ).And now I am trying hard to make it work.And it’s really a difficult job for me.
August 18, 2013 at 17:21 #932
Now it turns to another problem, because of the worm gear I using,now the arms are moving very slow,in fact,when it receives M28 and homing in enough speed，but when it’s jogging(any commands like G1 X1 ) ,it’s really jogging in slow speed.So anyone can help? does M92(set axis_steps_per_unit ) can influence the rotate speed?
August 18, 2013 at 17:35 #933
adding some photo
that’s a real hand-made work,so don’t laugh at me.
August 18, 2013 at 17:37 #934
August 18, 2013 at 22:03 #939hoff70Participant
Sorry I can’t help much but I just wanted to say nice work!
Perhaps you need to change the default feedrates in your firmware? I believe that jogging the motors “looks” to these parameters in firmware for speed and perhaps going up on these values will help.
August 19, 2013 at 17:37 #947
After calibration the speed should be up to the correct levels. When m92 values are not correct, it will cause slow movements, and incorrect angles.
Another thing that can influence the jogging speed is the actual speed you sent pronterface to jog at. It is normally at 300… Really slow. Change it to 10000 on the pronterface gui to see better jog speeds.
August 20, 2013 at 11:59 #981
Follow your suggestion, now the Arm move in a good speed！Congratulate me，LOL！
But in fact now i am going insane with another question ,about where the zero point is,(the X0 y0 point),is it closed to the shaft of SCARA arm or just far away,eh,Please see my little pic, which point is the Zero Position(X0 Y0), A ,B, C, D, or other position?
here is the pic
August 20, 2013 at 13:38 #984
X0 Y0 is at point B
August 21, 2013 at 11:34 #1015
After a long time of building , I meet another puzzle.
That is , when I open Printrun ,then i send G28
the machine is working(at least I can see the motors are working)
but then when I press the X+ button ,then strangely ,not only the arm moves,but the motor that control Z axis working together, so is this Okay?Or that’s because I do something wrong?
The board I using is Ramps 1.4, firmware is armlevel
(recently i have a quick look at armlevel, and try to figure out how the brilliant Morgan works, but the firmware is so big, T.T , )
One more thing , there is a thought in my head. Why should we calculate a little translate program, translate the Mendel style G-code into a SCARA Morgan G-code, and I am really working on something like this .Detail here:
1.get the Cartesian G-code like G1 X30 Y40 Z20
2.change the Cartesian coordinates(x,y) into polar coordinate(r,\theta) ,output something like this G1 R50 T36.869 Z20
3.change it into a Morgan style Gcode G1 A32 B42 Z20 (this num are wrong,I just want to give some example )
4.change A B into X Y,that is something like G1 X32 B42 Z20 ,that all sprinter or marlin can understand what to do
Thanks for reading it all,lately I would try to build a little program like this,LOL (the Feedrate is big problem,but I’d like to have a try)
August 21, 2013 at 12:16 #1019
Issue m370 and then m500 to clear the bed level calibration. Report back if the z movement still occurs.
August 21, 2013 at 12:17 #1020
G code for mendel and morgan is exactly the same. Translation is done in the firmware.
August 22, 2013 at 12:04 #1030
Hi Mr.Q(really cool name,lol)
the last problem is Fixed after i burn the armlevel again.Cheers!(I also change the Z homing feedrate,too,20*60 is too high for me,I change it into 1*60, lately I want to try 5*60)
I am here for asking again.
what does the theta 0 command(M360) means,and M361 too,
I draw a little pic to make my questions clearly,
just tell me which mode is right,A or B?
And is this means Theta arm parallel to the platfrom?
Thank you !!
August 22, 2013 at 13:18 #1031
August 23, 2013 at 07:05 #1039
August 23, 2013 at 08:57 #1043
That’s really help!
I will show some image of my progress.
August 23, 2013 at 09:35 #1045
Finally my calibration has done,thanks to the helpful pic at #1039.
But there’s a little bug I found(if it’s not a bug,forget it please),in the the Cal-flowchart1.
the last step of calibration, psi 90 M363 ,in my opinion, it should be M364, that really can make it to the result Psi arm 90 at elbow,like the pic you show me at #1039.
August 23, 2013 at 12:41 #1047
You are right, it is definitely a bug. One of the other members pointed it out already, but I did not have time to do it yet. This weekend I will attempt to fix it up, with some pictures like the one above.
August 23, 2013 at 14:05 #1049
here is some thing I do.
I change it from “Psi90 M363” to “Theta-Psi M364 ”
Bad news is ….it won’t be a PDF file,but a PNG file.
I am sorry that there not any PDF editor in my PC.
Hope this can help a little.
Thank you for your hard working!
Here is the link.
August 23, 2013 at 14:10 #1050
August 25, 2013 at 11:36 #1086
Good afternoon，everyone and Mr.qharley (eh here’s afternoon)
I am getting into trouble again.
Before the Z calibration，I take a test print,a 2mm cube.But it seems bad.The cube is not a real cube,but a diamond like cube. And for the problem of Z, because I use 5mm threaded rod, like mendel, I find that the default configuration is not too slow(M92 Z100),then I change via M92 E4000. But meantime I found that while the bed moves at F7800,it beeps aloud! So I am going to have the M92 Z100 back.
My question is what will morgan do when homing z axis.and why the default setting is not M92 Z4000 (or Z2560 for 8mm threaded rod )M92 Z100, becasue of current Morgan use （this SDS drill bit lead screw experiment）
,or there is more reason?
August 25, 2013 at 12:00 #1087
You were right to take increase the Z steps, but you will have to decrease the maximum Z speed. With the sds leadscrew it can move very quickly.
August 26, 2013 at 06:33 #1091
She prints,the Morgan in Asia prints!!
Even this Morgan is not a original Morgan,sorry that I have to go to school before Aug.29, and my Mendel can’t print something big like the drivewheel. Without other choice, sorry that I have to make some change,after all ,it prints! And I sure, SCARA Morgan deserves the name,Hunt Morgan.it’s the best Reprap machine I ever seen！
Thanks everyone in this builders forum,especially Mr.Quentin. Without your help I can’t make it to this step!
If there is anything I can help,I am on my way to be a volunteer.
beautiful moring of Aug.26
August 26, 2013 at 06:57 #1093
August 26, 2013 at 06:59 #1094
That is excellent news! Would you mind sending us a couple of pictures of your completed Morgan? I am very interested to see what it looks like. Will post it to the front page of the blog.
Yours will then be the first Morgan (that I know of) after my two to actually print!
PS: just saw the mail with a snapshot coming through. Thanks again!
August 26, 2013 at 09:12 #1103
It’s a puzzle to share the pic on flickr, hope this link can reach my snapshot!
and there is some pic form that link.
August 26, 2013 at 09:17 #1104
lately I will take some thing to print,and take some snapshot,too.
If there is anything that it shows unclear,just let me know.
And this is a really great job!
Hoping be your honest friend!
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