[Stoneman40]

How does mach3 go about reading RPM

I have a chinese machine that ive managed to control the spindle with Mach 3 by connecting the 0-10v wire and was wondering how do I get it to read RPM

the VFD is a Nowforever D100 and the bob is a JP-3163b V3.9

i understand it might not be able to be done with what I have but how does one go about doing it if it's wanted

I have modbus out on the VFD but not really understanding that either

[RCaffin]

To read the RPM Mach needs a signal from the spindle. It needs to be one pulse per revolution.

The standard way of doing this is with some sort of optical sensor, anything from the Index pulse on a full-blown encoder to a simple disk going through a basic optical interruptor. But you could equally use any other sensing system you want, as long as it sends a digital logic compatible signal to Mach.

You would need to connect the signal to the BoB and then assign the Pin used to Index under Ports&Pins.

Cheers
Roger

[mrgame1988]

Any further information on this one RCaffin? Ideas as to an easy setup? I'm not very electronically minded and really do need a bit of a push in the correct path. Any help would be great

[RCaffin]

The usual method is to use an optical sensor of some sort, either an optical interruptor or a reflection sensor. Without any idea of what your spindle looks like, what would suit your machine is hard to guess.
Look up 'photo interruptor' on the RS Components web site RS Australia | World Leading Distributor of Electronics, Electromechanical and Industrial Components .
Basically, a light beam with a flag going through it. The 'flag' is usually a thin disk on the spindle, with a slot cut out.

Cheers
Roger

[mrgame1988]

The usual method is to use an optical sensor of some sort, either an optical interruptor or a reflection sensor. Without any idea of what your spindle looks like, what would suit your machine is hard to guess.
Look up 'photo interruptor' on the RS Components web site RS Australia | World Leading Distributor of Electronics, Electromechanical and Industrial Components .
Basically, a light beam with a flag going through it. The 'flag' is usually a thin disk on the spindle, with a slot cut out.

Cheers
Roger

Hi roger

Thanks for the speedy reply! Im limited for space the way the spindle belt drive setup is done, its really bad. Ill get a photo of it tonight. I have thought about using the c3 index card which is available, that has a photo interupter setup. However due to mounting of the interupter plate im not sure how to best mount one like that. I was hoping i can use a hall sensor like this...

http://www.ebay.com.au/itm/Hot-Sale-NPN-3-wires-normally-open-DC-5-24V-Hall-Effect-Sensor-Proximity-Switch-/172029181145?hash=item280dbcfcd9:g:Z9QAAOSwxN5Wbiy 2&rmvSB=true&ul_ref=http%253A%252F%252Frover.ebay.com%252Frover %252F1%252F705-53470-19255-0%252F1%253Fff3%253D4%2526toolid%253D10001%2526cam pid%253D5336793038%2526customid%253Dskim11960X6972 91Xb91cbe6a8e9a60443a94867d933e8379%2526mpre%253Dh ttp%25253A%25252F%25252Fwww.ebay.com.au%25252Fitm% 25252FHot-Sale-NPN-3-wires-normally-open-DC-5-24V-Hall-Effect-Sensor-Proximity-Switch-%25252F172029181145%25253Fhash%25253Ditem280dbcfcd 9%25253Ag%25253AZ9QAAOSwxN5Wbiy2%2526srcrot%253D70 5-53470-19255-0%2526rvr_id%253D1031649950318

Cheers ryan

[RCaffin]

Oh, to be sure, that should work too. As long as the Hall Effect sensor is a bit above where the cutter will spray bits of steel.
At that price, I can only say go for it! You can use a LED and a small resistor to test the setup and output very easily.

Switching frequency 320 kHz - that should be fine. Detection to 10 mm: very good. Replaceable - wise.
Note that operation at 5 VDC might be marginal, but you can run the device at 12 V and take the output signal to just 5 V if you want (usually).

Cheers
Roger