See post http://www.cnczone.com/forums/open-source-controller-boards/326078-cnc.html#post1984706
Type: Posts; User: pminmo
See post http://www.cnczone.com/forums/open-source-controller-boards/326078-cnc.html#post1984706
I thought I'd take a moment and explain my disappearance from here as well as my website pminmo.com for those that might remember me. In late Jan 2014 I was diagnosed with stage 4 cancer. The...
stepper motor | eBay
NEMA 34 Stepper Motor | eBay
I'm having some health issues and It's march madness, so get 5 blank PCBs for $15. PMinMO.com Sale: PMinMO.com PCBs
Phil
PMinMO.com
Could be:
1. a bad L297 that is causing the L298 to fail
2. a motor wiring problem
3. a motor problem.
4. bad components associated with the L297 oscillaor to cause the current regulation to...
A3977SED and A3977KED are the same part, just the lead free version. Digikey has both:
Digi-Key - 620-1146-1-ND (Manufacturer - A3977SEDTR-T)
Digi-Key - 620-1144-1-ND (Manufacturer -...
Need more info on the specifics of "the standard scheme with L297 and L298". Schematic, PCB layout etc.
Panels and baseplate were cut using my wood router: My DIY CNC Wood Router
My experience with the 6560 failing is the quality of VMA and VMB at the chip leg itself. However, if a design is just thrown together not taking into consideration proper power supply timing for...
In general, most monolythic stepper ICs will generate spurious motor noise when setting idle. It's the current control oscillators of the choppers.
As to the Toshiba parts, they have the same...
The TB6560 itself isn't a bad chip, it's the board designs that turn it into crap...
Couple of points, the A3977 DOES NOT TOLERATE anything over 35V, and that includes back emf. So Practically don't run it at more than 27VDC power supply voltage. 2nd, you might get some thermal...
Not without considerable work, the LMD has elements that would have to be done in external components.
I just went with a different frequency.
Noise filter on the current sense lines.
You need to set an acceleration profile, you just can't start a stepper and have it go from 0 to x instaneously.
Kind of an interesting set of questions... efficiency of panel verses angle error would dictate the how long and how much I would think.
In really round numbers, sun moves 180 degrees in 12 hours,...
Yes you are correct, you are consuming power although 67 watts is subjective to motor drive method. Regardless of driver method, IMHO, for it to be efficient you need a mechanical break that holds...
Many things are possible given enough components...... If your asking using one A3985 to drive two H-bridges, it's not practicle. The fact that you wan't to run them at different speeds makes it...
I haven't done anything with it for a long, long time. I was offered a part time position with a local university designing instrumentation electronics for astrophysics research, so I unretired. ...
Not sure what you mean, as a nema 17 4 wire motor isn't a problem, and 24V motor supply isn't a problem.
Again, the regulators in the circuit, as designed, DON'T play in the motor current......... You don't need a 5A regulator for a less than a 100ma. If you look at what the LM317 runs, it's the 5V...
Both the 317 and 338 are floating regulators, so max input to them is the regulated output voltage plus the differential max. So for a LM317 that is configured as a 5V regulator, 45V is the max...
Where do I say you can sub a LM138..LM338?
As far as I know the LM138..LM338 are only available in TO-3 packages. The pcb for the L297-8, the LM317 is a TO-220. Two entirely different...
Yes in St. Peters.
Allegro notified me last week, I should be getting some parts to evaluate.
You don't have to use NC switches except on Estop. The G540 four inputs just pass a logic state to the parallel port as long as they see an open or a gnd (terminal 12) on the input. You just need...
http://www.fairchildsemi.com/ds/LM/LM7805.pdf
Page 2 Vi 35V for Vo 5 to 18V
http://www.st.com/stonline/books/pdf/docs/2143.pdf
Page 22 Vi 35V 35V for Vo 5 to 18V
...
L05 is 30vdc, standard 7805 is 35VDC max in. Some spec it as 30V differential input to ouput which is still 35VDC in.