Problem- C6 SPINDLE RPM PROBLEM

[gio1976]

1. MY C6 SPINDLE RPM IS NOT STABLE WHEN CUTTING. PLS HELP. MACH3 RPM READOUT DISPLAYS UP TO 300 RPM EVEN IF ACTUAL RPM IS MORE THAN 1000.

2. DURING THREADING SPINDLE RPM CHANGES THUS SCRAPPING THE PART. I HAVE ALREADY PROVIDED A SEPARATE POWER LINE FOR THE C6.

3. ON SPINDLE STARTUP THE "FAULT" LIGHT LITS UP. WE HAVE TO TURN DOWN THE SPEED KNOB TO ZERO THEN SLOWLY TURN IT UP. WHAT SEEMS TO BE THE PROBLEM HERE..

ANY ADVISE?...THANKS..

[springlakecnc]

Dude,

I have no idea what a "C6" is. I believe Mach3 would only send a analog signal (0-10volts) to a frequency drive, and Mach3 has no idea what happens after that. There may be a fault signal comming from the frequency drive, that displays as a fault and shuts down Mach3 software, depending on who wired things up. I believe your problem is in your frequency drive.

You can adjust the ramp up and down, in all the freque drives I ever worked with, ALSO, there are many differn't settings for your torque. I.E. if you have a fan, you need more torque the faster you spin it, if you have a milling machine, you need more torque the slower you spin it.

Also, check your wiring. If a C2 is a 3 phase motor, there may be a dead phase, or 1 of the 3 fuses is blown. If it is a 3 phase motor, and good fuses, unhook the 3 wires going to it, and check with a ohm meter for resistance between wire hook up 1&2, 2&3, 1&3 and if there is no resistance in any pair, there is a dead winding in the motor. That would do what you describe, and eventually take out the frequency drive.

I think you should study your spindle drive manual.

Good Luck,
Buck

PS, smallblock has some good advice also

[ataxy]

c6 is the lathe model from sieg/syil

[gio1976]

HAHAHA, IT S NOT ME.....OKAY I'LL CHANGE THE PICTURE.

THANKS FOR THE ADVICE BUT SYIL C6 LATHE IS ONLY HAS A SINGLE PHASE MOTOR FOR SPINDLE.

[ataxy]

gio just a word of advice in most forum the use of all cap for writting is viewed as shouting by web "standard", i know you are not, i just wanted to point it out.

[syil canada]

to have mach3 post the proper spindle speeds you will need to change the pulley settings, in mach3 under "config" select the "spindle pulleys" settings. I have set my c6 to 1200 rpm, so to have mach3 display the proper rpm, i set mach to "pulley1, min 0, max 1200, ratio .0.35"

By playing with the ratio setting you can fine tune what the display is saying, the rpm should be consistent.

i hope this helps,


keith

[gio1976]

mach3 cannot detect speeds more than 470 rpm even if i already set pulley 1 to a maximum of 2000 rpm.
this was no the case a few weeks ago.

spindle motor cannot maintain constant rpm when cutting. the only time the rpm is constant is when spindle is idling.

[PEU]

I think the problem is related to config, try in Config>general config, lowering the debounce parameters

good luck

[gio1976]

thanks PEU.

rpm now displays above 470 rpm. its the config indeed.


one more thing sir, threading is still not that good. first few passes are fine but about 0.5mm or so in depth of threading spindle rpm changes and threads are ovelapping.....

please help.

thanks.

[MadMax]

What diameter and material are you threading? Maybe you're asking for more than what the spindle motor can provide. IRC it's only got a 3/4hp motor. If you're cutting a large diameter at high RPM, you might not have enough juice to push a constant RPM when more of the cutter is engaged.

You may have to compromise by stepping down to a higher torque setting if you're threading a large diameter. It's too bad, but it seems that Mach3 uses the index flag only to start the threading pass instead of using it to adjust the feed based on the instantaneous spindle rpm at each flag pass.

[gio1976]

im using 3/4 inch diameter mild steel at 2mm pitch thread. i also tried copper at 20mm diameter at 14 TPI.. still overlapping...

are these matls too big to thread in a c6? this was no the case a few weeks ago when we had 8mm dia x 1.4 mm pitch threads and it was fine.

i see the MACH3 uses flag only for indexing.... hmmm.

what's "IRC" ?

[ataxy]

how deep are each pass in mild steel? Copper can be a ***** to machine sticky material