Please help - missing steps ... Mach3

[emilvv]

Hi,

Problem solved. :) Thank you for all your help.

The PC LPT port generate strange pulses .... from 4000 ns to 300 000 ns.... ( based on linuxcnc tests .. )

Why I not saw the problem ..

I tested all the electronics with my another PC ... ( also with the same problem .... but a little bit better !!! ), I used another PC with CNC machine for manu years, but just for some small cuts .. with perfect shape ... )

So, I suppose my first PC is OK .... with both PC s .. the problem exists .... so the problem is in the electronics ....

But when I tested it with NE555 generator .. motors are fine !!! So ... I became almost with no idea what to do ..

I grounded all, used 74HCT245 ... 6N137 ... to change the logic voltage levels .... and finally on the last started the linuxcnc
for N-th time and saw strange situation ....

After start i have 4000 ns step period ... and after a while ... 1 second ... it increased to 300 000 ns.....
after reset statistics button .... the same situation ...

Mach3 doesn't see the wrong signals .... message is "System excellent" !!! :(

I didn't investigate to check signals by scope in time period ... I have no time for that ...

So, please fine attached first cut picture - 4 mm carbide tool in wood ..... Sorry I am not woodmaker ... it is just a test

Have a nice day to all of you,

Emil

[komatias]

Please do not be offended by this:

You are wasting your time the parallel port! You should seriously consider buying a motion control board like we have all suggested previously.