Newbie- need help with controlling stepping motors

[alaskanCNCguy]

i have recently aquired two teco 1.8 deg 5.1v 1.0 amp stepper motors that i harvested out of umax vista s-12 scanners. i have isolated the motor controllker and it is a toshiba TA8435H. i am having issues on how to interface them thru parallel port. any information is much appreicated!

[hesham morsy]

http://www.cnczone.com/forums/open_s...5-ta8435h.html

[alaskanCNCguy]

scanners have 8 bit microcontroller

[vger]

Hey AlaskanCNCguy,

If you decide not to remove the driver chips from the original boards, you may be able to use them as they are with a bit of modification.

Here is a link to the data sheet on the chip....
http://www.atnet1000.com/pdf/TA8435H.pdf

You can most likely use the power supply from the scanners (one for each board) and isolate the leads you need to connect to on the driver.

If you can see the traces on the board coming from pins 2, 3, 5, 6, 7, 8, and 9, and can isolate those pins from the original circuit, you may be in luck. Cut the traces a little ways from the chip to disconnect it from the original circuit and allow enough room to attach your new leads. If the traces are wide enough, you can scrape the solder resist off the trace and carefully solder to the trace. You will also need to find a place on the board that is signal ground. Pin 1 on the driver chip is signal ground, don't cut that trace, just attach to it. There are 2 clock (step) inputs. The second of these can jsut be connected to +5 V or logic high. The M1, M2 inputs will select your step mode... 1/1, 1/2, 1/4, or 1/8.

If the board is multi layer it may be a bit more difficult, but dooable by carfully cutting the appropriate driver chip leads from the board and soldering directly to them.

Best of luck
Steve

[alaskanCNCguy]

thanks much! your help is appreciated. the machine i am building has a x axis of 19" , y of 23" , and z is to be detemind. stepper motors are teco, 1.8 degree per step. 5.1V 1.0a . i aquired 2 scanners. vista s 12 & vista s 6. there are some revisions between the 2 boards and i havnt been able to accurately isolate the capacitors, resitors, diodes ect . idk how to coorectly wire the ta8435 for my motor but the threads posted here have helped alot. i havnt been able to find any data on my specific motor. i have my doubts on the type of cutting device i am going to ba able to use because the size of the motors. this is my first cnc machine. i was thinking about a pnuematic high speed drill ( similar to dentist drill) or laser for cutting applications for concern of backlash. i live in rural alaska and have a limited budget so savlaging parts and material is a usual for me. $33 for a 8' x 1 1/2" x 1/8" aluminum L channel at lowes!

[alaskanCNCguy]

i was thinking about a nozzle to despence powdered material and a laser to fuse it together. i was wonderin has anybody every tried a method like this to make pcb boards? i just hope i can get some help with this because i am new to the whole thing

[vger]

AlaskanCNCguy,

Hmmm, PC boards using a laser to fuse material.... If you are talking about making metalic conductive traces with copper powder, you will need a very hefty laser ($$$$$.$$) and your board material will have to have a higher melting point. It will be far easier to just buy copper clad board and rout your traces. There is a section here on doing that. I had some success making PCB's using EAGLE to design the traces and produce the G-Code, and then used my small (dremel tool) router to rout the boards. I hand ground my own engraving bit from a broken 1/8" carbide drill bit.

Sounds like you might find this site interesting....
RepRapWiki

Steve

[alaskanCNCguy]

ah i was wondering about that. i made a mini drill press for pcbs with my dremel. do you know of any open source programs? i will post pics of my materials. the parts arnt the strongest but my figuring is that if i build the first model well enough i can use it to make upgrade parts and/or another larger machine.

[vger]

Here is a link to the site that has EAGLE. The lite version is free to use for non-profit and evaluation. CadSoft Online: Freeware

There is one file that you need along with eagle called outlines_gcode.ulp
I attached it here because the original site that had it is no longer online. Also... you will need to rename it back to the .ulp extension. The board here would not allow me to attach it with the .ulp extension.
It goes in the ulp directory that is created when you install EAGLE.
There is another ulp available on the site called pcb-gcode-3.3.2.zip that may work for you... I haven't used that one yet.
It takes the traces you build in EAGLE and converts the outlines of the traces to gcode. I believe there are settings for trace spacing and engraving bit diameter etc...

Enjoy...
Steve

[alaskanCNCguy]

thanks for the help. i downloaded the freeware version last night very nice. now i am having trouble identifying my motors. what i know so far, manufactured by Teco Electro Devices. bipolar (ta8435h) 1.8 degree per step 5.1 volt 1 amp. found others with almost the same numbers and it says nema 17 class. found every motor except mine. but making great progress on the x & Y axis