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Step signal is just a pulse, typically about 5 - 10uS or so wide, pulse rate depends on how fast you want the motor to turn. Generally for fast pulse rates you need some sort of ramp up (accelerate)...

I would suggest a pawl mechanism - basically a linear part with a tooth form that engages the gear in one direction but rides up and over the gear in the other. Does this arrangement have to...

You've pretty much got it. I haven't fully checked your math but the numbers look reasonable. So when the opamp output is at 0v the v+ is at 1.95v. This assumes the prox (and therefore v-) is...

OK, then the vast majority are going to be the 'normal' ones and maybe 95/100 you'll get a useful answer... I'm pretty sure NAMUR spec'd devices will seem to be faulty under that test due to their...

JIm, yes, but were they the larger 2-wire internally amplified ones or the NAMUR spec'd ones..?

Correct...

The current through through the prox is either <1mA or >=3mA. Therefore the voltage across Rx1 is either <1v or >=3v. You are right that there is almost no current flow through Rx3...

So your cutter is wandering off into the sunset and you hit e-stop.... but the reason its wandering off is the software isnt thinking any more, just doing... and its certainly NOT listening to that...

You're welcome, always glad to help...

bingo!

since the proximity switch is current actuated the voltage to the switch itself is irrelevant. Those switches will operate from a 24v supply but...

Hi there...

How they are wired in depends on which 6560 board you have and what controller software you are using. However one critical point... despite what some user guides say, the e-stop...

Thanks guys, while I understood your points about the 2-wire high-current versions, the fact Matt said it was 3/16" dia bugged me... I've never seen a 2-wire high current one that small...

I...

Matt,

I hear what Al and Mike say...its your call... however...

I think there is some confusion about the device... the part # you quoted 83/2022X isn't a part number but a certificate of...

Exactly so, the input voltage to the schmitt will follow the current flow, so 1mA = 1V and 3mA = 3v. The schmitt output is LOW (logic low = 0.4v) when the input is above 3v and HIGH (Logic high =...

I couldnt find the data sheet for the switch itself, but there are plenty of products offering it as a protection mechanism, all of which seem to spec a 'secondary switching amplifier' with the...

No I don't Al, just from experience... and since they are expensive beasts and he wants to reuse whats there I wouldn't risk it personally.

They are 1k and 4.7k, that is the international standard way of showing resistances avoiding the issue of different decimal seperators (some countries outside the US use commas instead of decimal...

It'll fry if you do... I've seen those ones before, the internal chip won't handle it...

Here's one possible solution that uses minimal components...

This wont drive a relay direct (why do you need to drive one?) but its easily adapted...

there are many designs based on the concept, but have a look at blackToe 2x4 v4.0 as a particularly well documented design. The rails can be L, flat plate or inverted angle...

BTW, they use chain...

for a 600 x 600 work area, a fixed gantry machine will be roughly 750 wide and 1200 long, tho if the table overlaps the base, the base could be, say, 1000 or less by fixing the supported rails to the...

I really do not see the point of going to servos, unless you have a very cheap source, your requirements are well within stepper territory and servos are expensive - you have a misconception that...

for this application why not look at vgroove bearings on aluminum plate, cheap, easy to construct and good enough accuracy I'd guess, tho you havent said how accurate you need...

It would take a lot of components and some difficulty to do that, starting with working out exactly what signals you are trying to amplify - by the time you are finished you would probably have been...

Step 1 - design mechanics
Step 2 - refine design
Step 3 - work out what motion mechanics/motors/electronics you need...

Your first issue is to decide what form your machine is going to take and...

The maximum step rate given by the internal setting on that circuit is about 50Hz, however the circuit itself will be ok to much higher than that.

The achievable step rate is limited by the motor....

OK, i just found the motor you are using... the correct link is this

I'm sorry my friend but those motors are not going to work with this circuit... for several reasons...

Firstly these are...

You need to read the L297 and L298 datasheets to understand how these chips work.

As a minimum Control needs to be grounded (0v), Half/Full needs to be pulled to +5v for Full step or 0v for half...

That circuit is incomplete, What have you done with Vref, Control, Reset inputs and what values are you using for RS1, RS2?

Have you used the circuit you attached above?

The L298 is a bipolar driver... you can make it work with a unipolar motor by ignoring the centre tap connection on the coils and just using the ends. The performance you will get compared to a...

You are probably right, but check the actual winding resistance - 24 v @0.34A = 70ohms. However you are going to be sorely disappointed with that motor. That motor is will have a fairly high phase...