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Messages - joeaverage

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6711
Mach4 General Discussion / Re: Hall Effect for Spindle Speed Feedback
« on: September 09, 2017, 08:02:08 PM »
Hi dunnitagain,
do you have the 7535 IO termination board fitted? If not then the digital IOs of the DSPMC J4,J5,J11 and J12 are 3.3V capable and non isolated
per page 13 of the manual. The warning makes it pretty plain if you put 24V onto one of the inputs you'll blow it, in fact I would under no circumstances
put 5V on them either. 3.3V TTL is great stuff, fast as hell and really low power but don't do anything silly with it, its just not fault tolerant. Ask me how
I know and I will post you some ICs that I have VERY CUNNINGLY let the smoke out of!

No matter whether you use a proximity sensor or a hall sensor in absence of the 7535 board you must signal the input pin with 3.3V. I had a quick look
at the specs for an Omron prox sensor and it had a bandwidth of 500Hz, should be good for anything but a highspeed (>20,000rpm) spindle. However
the proximity sensor signalled full supply voltage, 10V min. So you would need some sort if interface which would include a 3.3V zener to prevent the
sensor from blowing the input pin.

The Honeywell hall sensor I linked has a power supply range of 2.7V to 7V, ie if you had a 3.3V supply or could derive one from a 5V output on the DSPMC
with a low dropout linear regulator then no interface is required, the signal from the hall sensor can be hooked directly to the input pin of the DSPMC.

If you do have the 7535 board then the prox sensor is pretty much plug and play.

Craig

6712
General Mach Discussion / Re: Motion controllers - Take me to school
« on: September 09, 2017, 07:15:58 PM »
Hi Mike,
seems like you've concluded that the mechanical limitations of your machine make it impractical to markedly increase its performance.
Without replacing the lead screws I tend to agree.

At the end of last year I started using an external controller, an ESS. Amongst the things I have noted is that my steppers are not as noisy,
or rather that the noise is very much less harsh. Also its possible to push them somewhat harder to accelerations and speeds which would
have caused a stall with the parallel port. These are consistent with improved pulse stream timing available from a dedicated controller
rather than your PCs CPU which has hundreds of tasks on the go at any one time.

An external controller may be a worthwhile improvement to your machine, in your case it means a controller, a BoB and either a combo
or individual drivers, not an insignificant investment. If they are chosen wisely however you will certainly be able to reuse them in your next
machine, and your post suggests you are thinking about it,... have you told your wife? I suspect with decent high voltage drivers and supply
your existing steppers will surprise you.

Craig




6713
General Mach Discussion / Re: Mach3 question
« on: September 09, 2017, 04:02:01 PM »
Hi Vince,
found tweakie's link....
Download Mach3 version .062 from here:
ftp://anonymous:guest@ftp.machsupport.com/Mach3/Mach3Version3.043.062.exe

Craig

6714
General Mach Discussion / Re: Mach3 question
« on: September 09, 2017, 03:56:57 PM »
Hi Vince,
not sure just at the moment, I know tweakie has posted a link and I will try to find it. I myself have .066 and used it without problems
for a couple of years until I changed to Mach4.

Craig

6715
General Mach Discussion / Re: Mach3 question
« on: September 09, 2017, 03:38:57 PM »
Hi,
no, you don't need to buy anything new. I would however download the .062 version of Mach3 for your new PC. There is a later .066 version but it
has a few bugs, the .062 version is preferred. The only thing you really need from the old installation is the licence file named something like
Mach1Lic.dat, copy it onto a thumb drive and put it in the new Mach3 folder and you should be good to go.

Note that if you wish to use the parallel port you will have to use the 32 bit version of Win7, a parallel port will just not work with ANY 64 bit OS.
If you are thinking about using an external controller like a UC100 or Smoothstepper then use whatever OS you want, Mach3 doesn't care.

Craig

6716
General Mach Discussion / Re: Motion controllers - Take me to school
« on: September 09, 2017, 03:27:24 PM »
Hi Mike,
whether you use ordinary steppers, closed loop steppers or servos is not that important, any of these devices can do the job.

If ger21 is correct that your lead screws are 1/4 diameter then the speed at which you can rotate them before resonance is limited,
additionally they will flex torsionally for a loss of accuracy and if you up the torque the problem gets worse.

Look at your machine and see if you cant replace those lead screws with, ideally ground ball screws (really really expensive),or
rolled screws. Ebay has zillions of them, go for 16mm ones if you can get them to fit. They typically have a pitch of 4,5 or 6mm
so to spin them at 1000 rpm means rapids of 4m, 5m or 6m per minute, very useful.

If it proves impossible to replace your existing lead screws then significantly increasing the speed of your machine will be limited.
Under those circumstances better specified but otherwise standard steppers with decent drivers and a 68V+ power supply would easily
provide an increase in speed up to the resonance limit of the machine whilst conserving you budget. You could certainly achieve similar
results with servos say, they would cost a lot more and you will still only be able to turn up the wick to the limit imposed by the
mechanics of your machine not the capability of the servos.

Craig

6717
Mach4 General Discussion / Re: Hall Effect for Spindle Speed Feedback
« on: September 09, 2017, 09:19:28 AM »
Hi,
does a proximity have the bandwidth for an rpm sensor?

The last link I posted requires three wires, 0V,5V and signal.

Craig

6718
Mach4 General Discussion / Re: Hall Effect for Spindle Speed Feedback
« on: September 08, 2017, 06:01:43 PM »
Hi,
my apologies, the second link is a duplicate...it should've been:
http://nz.element14.com/honeywell/ss411p/sensor-hall-effect-bipolar-to/dp/1784734

Craig

6719
Mach4 General Discussion / Re: Hall Effect for Spindle Speed Feedback
« on: September 08, 2017, 05:35:21 PM »
Hi,
trolling around the Element14 website:

http://nz.element14.com/allegro-microsystems/a1301eua-t/hall-effect-sensor-sip-3-1301/dp/1198085
is an example of a linear hall sensor, this device would require a schmitt trigger or comapartor in addition
to the sensor IC.

http://nz.element14.com/allegro-microsystems/a1301eua-t/hall-effect-sensor-sip-3-1301/dp/1198085
is an example of a switching type, note that it even has a built in pull-up resistor. If you have a 5V supply you're golden.
There are examples without the pull-up and they have much wider power supply limits and might be worthwhile
if you only have a 24V supply.

Craig

6720
General Mach Discussion / Re: Gecko line count faults setup help
« on: September 08, 2017, 05:16:33 PM »
Hi,
OK, you couldn't get any useful movement irrespective of speed if the motor were backwards.

Next question, and please excuse me if I'm asking another dumb question or treating you as such, but do you have
the current limit pot turned up enuf for the motor to develop useful torque? I see in the manual the direction
of rotation for increasing current limit has changed between models. It occurs to me that if the current is restricted
then the motor cannot accelerate and could only follow at very slow speeds.

Craig

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