The illusive Boxford 260vmc

[GeorgeD]

The tachometer circuit.
http://www.davehylands.com/Electronics/Tachometer/03-Schematic.html

http://www.davehylands.com/Electronics/Tachometer/

[GeorgeD]

Thanks George, I did consider going down that road and I may even buy one as they are a very reasonable price and usefull for other things

Think outside the box,or in this case inside:heehee:

Buy one, position the foil somewhere on the spindle,strip down the tachomete handheld unit,unsolder the the sensor and put/mount the digital readout in the front of the case n the boxford,solder some wires to the sensor and resolder the wires from the sensor to the digital readout unit.

[irving2008]

Think outside the box,or in this case inside:heehee:

Buy one, position the foil somewhere on the spindle,strip down the tachomete handheld unit,unsolder the the sensor and put/mount the digital readout in the front of the case n the boxford,solder some wires to the sensor and resolder the wires from the sensor to the digital readout unit.

you missed two vital points George... firstly its not a sensor but a laser reflectometer which is only rated for pulsed usage and secondly, they are not continuous reading but 'read-on-demand' therefore need a push-to-read button ... as a speed readout its not that useful....

[irving2008]

The tachometer circuit.
http://www.davehylands.com/Electronics/Tachometer/03-Schematic.html

http://www.davehylands.com/Electronics/Tachometer/

Thats what I had in mind, but using a parallel interfaced display.. more common to find, cheaper to buy and easier to program.. for the added complexity of 5 more wires...

[Ricardoco]

Take a look at this.
www.e3b6a5y.com/365/WiringDiagrams/365um6150rpfTACHO.PDF

It seems to fit the bill?????

[irving2008]

Take a look at this.
www.e3b6a5y.com/365/WiringDiagrams/365um6150rpfTACHO.PDF
except it cant deal with the 50:1 reduction needed...

It seems to fit the bill?????

except it can't deal with the 50:1 reduction needed

[Ricardoco]

except it can't deal with the 50:1 reduction needed

Yes but it would seem to be easier to change from 50 holes to 1 than to design circuit, buy parts, assemble board, program board.