cnc screwcutting???

[hoggy]

Hi All,
 
Have just finished cnc taig lathe,petol here in the uk but would very much like to add cnc screw cutting ,am now stuck with the problem of spindle encoder(lack of knowledge) here's the one's I have been looking at,don't know if it will do the job or what one or what one to go for RS Stock no: 301-8442 ,RS Stock no: 303-1192 ,RS Stock no: 455-8020 ,so do these not need a PCI encoder interface card if not how do you wire it all up to mach3 pins,do I need a resister etc,if so which one, a diagram would be a great help. ,sorry for my lack of knowledge  on this, am ok on the machine side of things ex toolmaker but know bugger all about the rest.

Regards Steve

[Hood]

I used this one for my mill 455-0896 for both a speed sensor and also a limit switch for the Z Axis. You also need a 220 ohm resistor.
Hood

[hoggy]

Many Thanks Hood,
Have you a diagram of how to wire it into mach 3,as this is something I know very little about.

Steve.

[Hood]

I made up a wee circuit board to connect my limits and spindle sensor so my wiring diag will not do for you but its fairly straightforward. If you get the sensor I used you connect the green and black wires to ground, the white wire to 5V the Red wire is connected to the 5v through a 220 ohm resistor and finally the blue wire is connected to any of the input pins on the parallel port (breakout board) I got my 5v and ground from my breakout board. All you then need to do is enable the Index on Inputs page and set it to the pin you connected to.

Hood

[hoggy]

Great stuff,
Many thanks Hood,
Just so I make sure I get this right both the white and red wire are to +5v,but only the red one goes  through the 220 ohm resistor?,also is it then just a case of having a disc spinning on the back of the chuck with one slot in it i.e 1 pulse per rev,or is it a white painted mark.

Steve.

[Hood]

yes thats correct and yes a disc with a slot is all you need. I have a 10mm wide slot and it works great. See pic of the setup on my mill.
 BTW a big thanks goes out to John Prentice for helping me out with this when I was starting up.
Hood

[hoggy]

Many thanks Hood,
 
This has saved me many hours of searching and head scratching.

Thanks Again
All the best

Steve.

[Hood]

No problem, just passing on the knowledge that John P passed to me
Hood

[Dale gribble]

Hi, I just purchased the speed sensor 455-0896 from RS, but I'm having a little trouble getting it to work, I've connected it as described using a old mobile phone charger 5v dc for testing. I'm connecting my multi meter to the negative and to the blue wire but I don't see any output. Is there something more to this circuit?

Any information would be gratefully received

Regards

Dale gribble

[Hood]

Did you remember the resistor for the LED side?

Hood