Re: Z axis lose steps
Are you sure that 4000 is the right steps/mm? What threaded rod do you have driving the Z axis?
View ArticleRe: Do the heatsinks on a A4988 make you nervous?
As mentioned by gmckee and dc42 above, you can do without the heatsinks as in the A4988 and DRV8825 they are practically useless. On the other hand, active cooling (i.e. a small fan blowing cool air...
View ArticleRe: Do the heatsinks on a A4988 make you nervous?
Just buy $1000 drivers that are sized to handle 100A without cooling! Or buy a system with cryo-coolers on it. People want cheap components with ridiculous specs 100s of A4988 driver out there running...
View ArticleBLDC design
hello all guys i am new .this post is the first one. i am working on BLDC motors and try to make and design some. i need to know how is possible to make the max torque near max speed? ( by changing in...
View ArticleRe: Did anyone used linear hall sensors on BLDCs for position sensing?
Some BLDC motors have hall effect sensors built in and the signals are used by the driver chip to regulate speed, etc. I have a blower from a CPAP machine (from American Science and Surplus) that cost...
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Re: BLDC design
If I understand correctly, torque is proportional to coil current, so theoretically you could get the desired torque at any speed as far as you can supply the desired current to the windings....
View ArticleRe: Did anyone used linear hall sensors on BLDCs for position sensing?
Since I asked the question first I have gone through several tests. Working together with a motor manufacturer some samples were created including an additional linear hall sensor to the usual three...
View ArticleRe: BLDC design
Quotemisan If I understand correctly, torque is proportional to coil current... For any particular permanent magnet motor, yes. More generally, for permanent magnet motors, it is proportional to the...
View ArticleRe: BLDC design
Thanks dc42 for chiming in. I have tried to keep things simple but I mostly agree with your points. Quotedc423) there is a maximum current (the rated current of the motor) that you can put through the...
View ArticleRe: BLDC design
Quotemisan On the other hand ... Quotedc42If you add turns, you have to use thinner wire to fit the extra turns in... if you add turns [of the same wire] you will increase the ampere-turns of the...
View ArticleRe: Do the heatsinks on a A4988 make you nervous?
Quotecozmicray .... 100s of A4988 driver out there running without heat sinks without any problems If it does get too hot --- get another one for $5 @cozmicray You are not getting the real issue here:...
View ArticleRe: Do the heatsinks on a A4988 make you nervous?
The chip is designed to thermal sink thru the bottom of the chip. I hope the designers of the A4988 considered that. Users try to pull too much current thru these drivers. or diddle with them when...
View ArticleZ motors not working
Hi! Building a prusa i3 from the replikeo kit with an e3d hot end and have been having some trouble getting either of the Z-motors to work. I have tested all motors, endstops and connections, all work...
View ArticleRe: Z motors not working
In your firmware make sure you have the correct steps per mm. Steps per mm Calculator Next, make sure jumpers are underneath the stepper driver. Then try the driver on another axis and make sure it...
View ArticleCONTINUOUS RUNNING OF STEPPER MOTOR FOR GEN6_MARLIN
Hi guys, Does anyone here know how to configure my .INO in order for me to run the X,Y,Z,EXT motors continuously 24/7. I just want to have a reliability test for my 3D printer project. Thanks and...
View Article42BYGHW609 NEMA
wantai specs are: black= A+ green = A- blue= B- red= B+ that´s aliexpress says about. my question is: 2B/ 2A/ 1A/ 1B RAMPS matches A+/ A-/ B+/ B-? if so, I´ve tried: BLACK/ GREEN/ RED/BLUE BLACK/...
View ArticleRe: 42BYGHW609 NEMA
Take 2 wires from the motor. Put them together and try to turn the motor manually. If you feel some force you got the first pair.
View Articlex-axis and y-axis problem
I'm using RUMBA TAURINO and MARLIN. I have calibrated the AXIS_STEPS_PER_UNIT. The movement for z axis is fine, but for x and y axis, the stepper motor only move for 2mm, 10mm and 100mm. My default...
View ArticleRe: x-axis and y-axis problem
When you say you calibrated the axes, what did you actually do?
View ArticleRe: x-axis and y-axis problem
Quotethe_digital_dentist When you say you calibrated the axes, what did you actually do? He has a thread with the same problem in the reprappers forum, and someone came to the conclusion that he...
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