The illusive Boxford 260vmc

[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.

[Ricardoco]

Ok the new break out board, power supplies and speed control interface mounted and ready for wiring..




Rick

[irving2008]

well £24 delivered isnt bad...

blanking out 49 holes might not be as easy as you think, you might need to provide an alternate sensor. Also if you do blank the holes you'd prevent using it for closed loop speed control later...

[Ricardoco]

well £24 delivered isnt bad...

I liked the look of it, its fit for purpose and the price is not bad, although im not sure if i will end up buying another sensor, it will be interesting to see what that chip is on the back.

blanking out 49 holes might not be as easy as you think, you might need to provide an alternate sensor. Also if you do blank the holes you'd prevent using it for closed loop speed control later...

As always im thinking you are correct, maybe ill just mount another sensor on the spindle and be done with that, mind you i couldnt find anything suitable on fleabay

Rick

[Ricardoco]

This may sound stupid, but im just wiring up the drivers to the BOB and i was wondering if there were default ports used for axis, IE X=pin??? y=pin??? etc.. I do like to keep things default, as it makes things less complicated If I get problems.

[irving2008]

yes there are...

Typically (courtesy DIYCNC)

1 Charge pump signal Enable
2 X Direction X Axis
3 X Step X Axis
4 Y Direction Y Axis
5 Y Step Y Axis
6 Z Direction Z Axis
7 Z Step Z Axis
8 A Direction A Axis
9 A Step A Axis
10 Input 1 Input pin
11 Input 2 Input pin
12 Input 3 Input pin
13 Input 4 Input pin
14 Output signal Output pin
15 Input 5 Input pin
16 Spindle pulse Output pin
17 Relay 1 Output pin

18-25 Ground GND

[GeorgeD]

blanking out 49 holes might not be as easy as you think

Hmmmm.... childs putty will do nicely methinks