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Jan
MemberAlden,Thank you for your reply.
I think my biggest problem will be frequency.
When I set up $4 for only 300, steper motors seem to be working ok.( But I think I must still make more tests to be sure that frequency is the only problem)
Is there any way how to find out a reliable frequency? Or only try and see?
Where shall I return the previous GRBL shield v2? Which is your address?
Thank youMemberHi,
Thank you for sending out the replacement of GRBL shield I received this week ( version 3).Please let me know the address where I should return the version 2. I tested the new version but still does not work properly.
Can you please let me know what kind of stepper motors you tested with the GRBL shield?
I use 42BYGHM810 which has 2.4 A current and not sure if the IC stepper drivers, you use with GRBL shield, are strong enough to drive my stepper motors.
GRBL shield becomes soon very hot even though I use quite large heatsinks and then stepper motors do not turn properly.
Thank you for your reply.MemberHi Alden,
Thank you for your reply.
Transaction ID is 4SC50539W0396830Y and I also sent to you email about the payment I made via PayPal.Please let me know after you send out the GRBL shield replacement and also let me know the address where I should send the faulty GRBL shield.
Thanks again for helpMemberHi Alden,
Thank you for your reply. You sent me version 2.Shall I send back the GRBL shield first or after I get the new one from you?
Which email shall I use to send to you my mailing address?
Thanks againMemberAlden,thanks for the reply.I played again with GRBL shield but still no success
Tried for example these
1.
I connected Z motor only
and tried your commands
For example with
G1F50Z10
Motor turns,stops,turns,stops,etc.. I tried to set trimpots but no good
For g1f500y100
Motor turns and stops and X LED still shines for some time2.
I connected Z motor and Y motor.
Motor with Y axis turns then stops, and LED with Z channel starts blinking, Y LED is dark and X LED dark
The same with other frequenciesWhen e.g. I tried g1f500z100,
motor with Z axis turns then stops then turns then stops and so on, and LED with Z channel starts blinking, Y LED is blinking too and X LED is very bright3.
I connected only X motor
and enter
g1f300x100
motor turns a little, stops, turns, stops etc
I tried with various f parameters and the same problem4.
Then I connected X and Z and Y motors
and enter
g1f300z100y100x100
X does NOT start at all, Y motor turns a little and stops . Z motor turns a little, stops, turns,stops,turns etc.
I played with various values of f e.g
g1f50z100y100x100
g1f100z100y100x100
g1f500z100y100x100Before every command I made a reset of GRBL shield.
Do you have any idea?
Is GRBL shield faulty?Thank you for your reply
MemberAlden,
Thank you for the reply. But as I already said, I am not using it with ShapeOko now and you told me, in another post(http://www.synthetos.com/forums/topic.php?id=615), that I do not need to make that mod if not using with ShapeOko. Does it mean you changed your oppinion?
Besides that mod is for Z axes only so X and Y should work correctly.Is it so?
ThanksMemberAlden,thank you for the reply.
I tested motors separately, not with any CNC machine, so there should not be any friction.
As I said above I use 42BYGHM810, that are 400 step motors.
I have not made any mod to your GRBL shield, so there are 8x microsteps.And if motors are tested unloaded, what GRBL setting should I use?
Thanks for your helpMemberAlden, Thanks for your reply.
I know if I issue G0x100 for the second time, motor will not turn.Motor stays quiet.
But I am talking about the fact that I can hear “something” from the motor or the motor turnes only a few angles.
Here are more details I found out today
So I bought another power supply – now I use 24V/6.5 but yet GRBL does not work properly.
E.g.
I connect a motor to Z axis and enter g1z100( I use G-Code Sender program), sometimes Y and Z axes LED shine but sometimes only Y LED shines and sometimes Z and X axes LEDs where X shines much more stronger .But motor is still connected to only Z axis.Another example.
I enter g1z100( motor is still connected to Z channel). Works OK. Now I push reset button on GRBL shield and enter again g1z100.Now it only moves a few angles.Reset again and enter g1z100 now it works. Again reset, enter g1z100 but it does NOT work.So,sometimes works, sometimes does NOT.
Are there any test points on GRBL shield I should measure? Is there any testing procedure available?
ThanksMemberAlden, thank you for the reply.
So I changed power supply. Now I use 24V/4A but still does not work.
If there is only ONE motor connected to GRBL shield it works.
E.g I connect a motor to X and the motor works – I used G1x100 command;
then I connect another motor to Z axis and issue command G1x100 again. But X motor does not work.
So I remove Z motor, push reset button on GRBL shield and issue g1x100 command. Now X motor works again.
But g1f300x100y100 works OK.
Does it mean I must use even stronger power supply?
I use steppers 42BYGHM810 that have rate voltage 2.4V and rate current 2.4A.
Thank you for your helpMemberAlden, thanks for your reply.
I played with tripot of X axis ( but with ONE and only one motor connected) as long as it started properly.I used command like g0x1000.Then I did the same ( I set tripot)for Z axis – with one motor connected- but different motor from that I use for X axis.Motor also turned.I used command like g0z1000.
Then I connected those both X and Z motor to GRBL shield and tried a command like g0x1000.But X motor did not moved properly.It moved only a few degrees and became noisy but did not turn.A similar problem with Z motor.
Besides I also noticed that $0,$1 and $2 are important for motors to work( turned) properly.
As I use 0.9 degree motors I think they must have 400 step per revolution.
My threaded rod is 8mm ( for all axes), microsteps are defaults so $0,$1 and $2 should be
400*8/1.25=2560Is it true that the higher values of $0,$1,$2 the higher current is needed for motors?
Thank you again for helpMemberAlden,Thanks for the reply. You say I need not make the mod if running a different machine from ShapeOko. Is that problem with ShapeOko caused by the fact that ShapeOko uses both belts (X and Y axes ) and rod( for Z axis)?
I would like to use GRBL shield with a CNC that uses thread rods for all 3 axes.
Is there any rule how I can find out the mod is necessary?
Thanks again for the explanationMemberAlden,thank you for your reply.
No, I do not think I over-torqued the potentiometers.
I tried them again and they still can be turned through 270 degrees only.
Do you have any other idea what I should check to make GRBL shield run?
Thanks.MemberThanks Alden for the reply.
But why is that modification needed for Shapeoko?MemberAlden,thanks for the reply.
And what is you opinion of the ShapeOko CNC? It has a mixed driving and it seems to be quite popular these days.MemberRiley,thank you for your help
Now grblshield works.But I was told I must set params of GRBL such as $0,$1,$2 etc.
For $0 I should know the level of microstepping. Is the default 8x?
Does it mean the higher the better?What is microstepping of TinyG?
Thank you for the reply. -
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