The illusive Boxford 260vmc

[Ricardoco]

Hey Irving, thanks for the pinouts, thats made life a little simpler, i notice that there is only 1 pin for spindle output pulse, on my board from cncdoctor there are two,one terminal labled "Pulse" and one "RTN"...

Also Ive been looking for a sensor for this display i found on fleabay with no luck, do you have any suggestions?

[irving2008]

Hey Irving, thanks for the pinouts, thats made life a little simpler, i notice that there is only 1 pin for spindle output pulse, on my board from cncdoctor there are two,one terminal labled "Pulse" and one "RTN"...

Also Ive been looking for a sensor for this display i found on fleabay with no luck, do you have any suggestions?

look on fleabay for "slotted opto", returns half a dozen options... just the device.. will need mounting on a small circuit board with a couple of resistors, and you'll have to rig up some sort of vane on the spindle to interrupt once per rev...

Alternatively, and more easily, if you are set on the ebay display, use a 74HC390 divider chip to give a 'divide by 50' with only 1 chip and 10 solder joints!

[Ricardoco]

look on fleabay for "slotted opto", returns half a dozen options... just the device.. will need mounting on a small circuit board with a couple of resistors, and you'll have to rig up some sort of vane on the spindle to interrupt once per rev...

Alternatively, and more easily, if you are set on the ebay display, use a 74HC390 divider chip to give a 'divide by 50' with only 1 chip and 10 solder joints!

Ok that sounds good but this is uncharted ground for me, the 74hc390 seems like the way to go and i will get a new slotted sensor just to be on the safe side as i dont know if the existing one is ok, you make the circuit sound so simple ill just trust your judgement over mine:confused:



Rick

[irving2008]

Ok that sounds good but this is uncharted ground for me, the 74hc390 seems like the way to go and i will get a new slotted sensor just to be on the safe side as i dont know if the existing one is ok, you make the circuit sound so simple ill just trust your judgement over mine:confused:

Rick

Rick,

Circuit attached...

I'm guessing the opto will need to be powered so I have shown likely values (330R/4k7) for the resistors needed to energise the LED and bias the receiver. If you knew what type it was I could give you better values but these should do.

[Ricardoco]

Rick,

Circuit attached...

I'm guessing the opto will need to be powered so I have shown likely values (330R/4k7) for the resistors needed to energise the LED and bias the receiver. If you knew what type it was I could give you better values but these should do.

Thanks Irving, I went for the H22A1 type sensor if thats any help. I couldnt see Attachment there anywhere ...derrr lol