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Reinstalling the balls into a ball nut.
The story: A friend of mine (Larry) obtained a very nice ¾ inch diameter by 35 inch long lead screw and SKF ball nut assembly. So discarding the two ACME...

Ray, It would be my luck to turn it on and it already be set for full current and smoke it before I could adjust it. I'm running old IBM unipolar motors so I built my own drivers using a MOSFET that...

swampdonkey
,
When running a job, the computer outputs a series of pulses for each motor, one for direction (forward or reverse, called DIR), and one for steps, to rotate the motor so many steps....

One concern I see is that the current specifications of the motor (4.2 Amps)
"Part No.: WT57STH115-4204A single shaft
Frame Size: NEMA23
Step Angle:...

vulcom1
Here is a simpler version of the driver. uses 3 IC's at about $1.50, and 4 MOSFETs at about $1.50 each.Joe

Here is a circuit that will drive a uni-polor stepper (4 of them). I have a circuit for a bi-polar (H drive) version but have not built and tested it. This one has the X and X-2 motor drivers...

Jorisrf;

John is correct, you need a higher input voltage than the output voltage, for any of those three terminal regulators. Also for better regulation, the voltage should be from a low...

Jorisrf,
Here are three free schematic CAD programs that I have used. The Expresspcb is probably the easiest for making a schematic, but most limited. I am currently using (learning) the Designspark...

My math comes up to 9 amps, not 5. Assuming full step, unipolar or bipolar windings, 1.5 amps per phase, there will be two windings turned on all the time for each motor. That will be 3 amps per...

If you want to use the referenced motor wired as unipolar, the H01259-01U kit sold by there guys work great. The schematic is shown on the datasheet link next to the photo of the board. The circuit...

Andycorleone,
From the photo, it can't work. A turnbuckle has a threaded rod with a RH on one-half the rod and a LH on the other, and uses two nuts to follow the threads; one LH and one RH. The nut...

I did laugh while reading your response CarveOne. Sometimes we can't help but embarrass one's self. i.e. using "are" instead of "is", in a quote. Especially since I have happily lived with an English...

Tskguy,
Making a power supply for one of those motors shouldn't be too difficult. I would use the core from an old 2KW variable transformer, like the Variac. By removing the wiper, then insulating...

CarveOne,
Now we won't know what not to try, and why. Isn't that like "There are no such thing as a dumb question". Joe

Do what I do. Sit down.
I had an old swiveling drafting chair; the ones they used while sitting at a real drafting table. You know, before CAD became the norm. It had a very nice substantial base...

Daz,
That motor looks a lot like mine. They came out of an IBM 5256 printer. My motors are 4.5 volts at 1.5 amps. IBM used a higher voltage and a series resistor, (like you describe) which improved...

Joe,
That is a great idea, and just when the current Home Shop Machinist has an article about scraping. I will take a look at modifying mine and give it a try. I think I want to scrape bearing...

Terry,
I wouldn't jump too quick worrying about the power loss. With a lead screw, it is amazing how little power it takes to move that nut. The thread is really an incline and does have a...

Terry,
I'll try and explain it.
In inches, a 10 pitch single start thread, will have 10 threads per inch, or ten complete threads for every inch of run. Simple enough right? A two start 10 pitch...

Carverone,
That is a very nice layout. I don't see any thing that would cause a problem with either wiring versions. I am surprised though to see you did not put it all in a metal box. Shielding the...

tulsaturbo,
Unfortunately I am in Germany visiting and not at home where I have my schematic program loaded. It will be a while before I get back. However, There are two ways as mentioned here in...

Another tidbit. I found this link, referencing gauge and current ratings for wire, with a neat little calculator. Also a paragraph about a clamp-on meter for DC circuits. Does your $10.00 meter have...

I would suggest you use your shielded 4 wire cable for the motor coils (2 for "A" and "X", 1 for "Y" and 1 for "Z" and use one (1) stranded CAT5 cable (24 gauge) for the switches. Is there enough...

Will this one work? Click on the "Show All". The whole manual is down loadable.

Machine Codes | Tormach | We provide personal small CNC machines, CNC tooling, and many more CNC items

Joe

Jean,
I may be full if crap but it seems to me that if you are going to measure DC current, you need an ammeter, not a clamp-on meter. I think you are measuring the output of a PWM current stream....

Jean,
This may actually be a good idea; if you need one motor to be rotating in the opposite direction. For example, in Carverone's machine, he uses rack and pinion drive for the X Axis. With the...

You can get a 12"X12"X6" Gray plastic box (NEMA type 6P) from here for about $33.00. They have smaller ones too.

Carlon 12 In. x 12 In. x 6 In., Gray, Junction Box - E989R-UPC at The Home Depot
...

Oops, didnt check if the version listed has EMC2 loaded so it probably won't work. I do think you can make the install CD's and boot from the install CD on the computer that XP is loaded and run it...

Have you though about loading ubuntu on the Windows computer. That way you may be able to verify the computer hardware is acting the same way without reinstalling windows XP. Also lets you run both...

Jean,
Why not connect the input of the second motor driver's input (A) to the same parallel port pin that the first motor driver's input (X) is connected. Then no worries about motor current...