see post 37
see post 37
Phil, Still too many interests, too many projects, and not enough time!!!!!!!!
Vist my websites - http://pminmo.com & http://millpcbs.com
AND YES!!!! I RUN IT With alot of improvisation (not build alexander current limiter yet) , i used alooot of ceramic resistors is series (im not shure if i limit the current correct) and that was all for testing and learning this stuff. Im so happy! pmnmo you best man on inet and im very thankful for all help! Now i have some more questions.
1: I used minebea 17PM-H005-P2V2 1.8degree stepper 0.9A, 4.7ohm (if this is correct specs , i find that on some spanish forum or so). on PS 24V , motor run nice and smooth but only till ~70mm per minute velocity (in mach3 motor tuning) and its abit slow. On higher values , motor just buzz /or its realy at low torque. I asume that problem is in low PS voltage or in wrong specs for my motor (so i didnt limit current right etc) ?
2: for logic suply i used 5v from pc psu and i limit it with 280ohm resistor so i get 5V 20ma for 1 pic (i put just 1 pic on board) , now when i put all 3 pic on board do i need 5v
~60ma ? tell me if im correct on this.
P.S big thanx to alexander for this great board for someone who are not so good at electronic!
As steppers go up in rpm's different issues perk their pesky heads, resonance, suplly voltage, motor inductance... This may help you some: http://pminmo.com/PMinMOwiki/index.p...chanical_Power
You don't need a resistor to limit the current on the 5V for the pics.
Phil, Still too many interests, too many projects, and not enough time!!!!!!!!
Vist my websites - http://pminmo.com & http://millpcbs.com
Tnx im gona study that.
One more question and i think its the last one
Its say its for max 30VDC 5amp , can i use abit higher cus i have 40volts PS? I use irfz 44N. And whats max voltage if VAC is used?
IRFZ44 isn't a good choice, they may work, may not depends on the batch. This circuit should use logic level mosfets, for example the IRLZ44. With the IRFZ44 your supply voltage shouldn't be higher than 26V and that's pushing it. Take the Vdss rating and divide by 2 and it should be lower than that.
Phil, Still too many interests, too many projects, and not enough time!!!!!!!!
Vist my websites - http://pminmo.com & http://millpcbs.com
Oh my What is best substitution for IRLZ44N? Cant find them at local electronic shop's ..
I used irfz cus i read "but any type LZ´s or FZ´s will do..." on howto.txt.
Do an internet search for logic level N channel mosfet. I could give you numbers but your avaiability would be a different issue.
Phil, Still too many interests, too many projects, and not enough time!!!!!!!!
Vist my websites - http://pminmo.com & http://millpcbs.com
Is IRL530N , IRL540N fine? I can get this. Its 100V rated so i can use ~40V PS for my motor with no problems? ty for help
The IRL540 is logic level, and 100V I think it will work for you ok. It's capacitance/charge characteristics are higher than some newer logic level mosfets.
Phil, Still too many interests, too many projects, and not enough time!!!!!!!!
Vist my websites - http://pminmo.com & http://millpcbs.com
Phil
Will a D44T2 mosfet work on this board? I have a hundred of these and would like to utilize them.
Hi Alexander 666.
I wanted to write and thank you for taking the time to publish your very good controller and chopper designs.
Will definitely be building this as my first foray into CNC. Will be doing some routing but started out with this idea to drill PCB's which as you would know is a real pain. Hope you can help me with the following questions re your designs.
1. The motors to use. I know absolutely nothing even after some time in the CNC Forum. My local electronics shop has these: http://www1.jaycar.com.au/productVie...4&form=KEYWORD OK for a start?
2. Software. I have been using PIC chips and VB6 for years so no problem there. But the Mach3 software is very expensive so is there any problem (pros/cons) of using a VB interface?
3. Do you have any suggestions about the actual CNC machine? Will be using a Dremel 240 volt for the PCB drilling so do I need more motor steps to achieve place accuracy < 1mm?
Thanks for your time.
cheers
Dave
Is there a pic that doesn't have to be programmed that will work with this circuit? I don't have the know how nor the means to program a pic.
666,
Love the simplicity, working on building a home-CNC with "the smallest 3 axis controller"
Just wondering How to set the 'home' and 'limit' switches?
Please help as best as you can.
Thanks,
Raj
I believe I've answered that on my Bboard in this set of threads: http://pminmo.com/phpBB2/viewforum.p...a236b141c00400
Phil, Still too many interests, too many projects, and not enough time!!!!!!!!
Vist my websites - http://pminmo.com & http://millpcbs.com
PMinMO,
Thanks for that....
lot of listings..... seems to have a lot of other topics of my interest too....
will go through.
Thanks,
Raj
PMinMO,
Thanks for the URL ... read through ...
Now,
If using MACH3, One home switch per axis,
No limit switch (will be defining soft-limit in MACH3)
then, please see attached image ..... this is correct?
Thanks,
Rajeev
And that would be (pretty much) a Linistepper:
http://techref.massmind.org/techref/...step/index.htm
http://techref.massmind.org/techref/...p/lini_wks.htm
You would also need to add PIC code for microstepping...
Parallel evolution?
I know the .hex is available but I was wondering if the asm is. Just playing around thinking of changing the code to single phase full step instead of double. I decompiled the hex but it looks like there could be a few issues in the decompiled version and a commented piece of code could help out a lot.
Are you asking about the Linistepper? The ASM is available right from the main page under "Features" click on "PIC Software"
http://techref.massmind.org/techref/...step/index.htm
The direct link is
http://techref.massmind.org/techref/...p/lini_asm.txt
If you make a usable change, please consider sharing it with us as others have:
http://techref.massmind.org/techref/...istep/mods.htm