Messages

81

General Mach Discussion / Re: Manual Tool Change with TTS

« on: November 05, 2013, 09:23:52 AM »

Tool changes are done with M6Tn.  G43 simply applies the length offset.

Regards,
Ray L.

82

General Mach Discussion / Re: Mach4

« on: October 28, 2013, 04:27:48 PM »

Mach3 v4 has been coming "any time now" for about four years.  There is still no official release date, and from what I've read and heard, it seems unlikely it will be this year.

Regards,
Ray L.

83

General Mach Discussion / Re: one pop then another, no Gecko light

« on: September 11, 2013, 10:17:20 AM »

In general, when a motor is stalled the current goes to infinity and would burn it up as all the energy is going to heat.
So when a stepper stalls max available current is  delivered, in your case 10 amps +- ........... depends on the fuse on when it will actual blow.

That is not true at all.  If the motor stalls, current will, eventually, reach the maximum value allowed by the current limit resistors on the Gecko.  The Gecko will never allow the current to exceed this value, unless the Gecko is a;ready damaged and no longer working correctly.  Even in that case, the current NEVER "goes to inifinity'".  The motor windings have resistance, which also limits the maximum current the motor can draw.  You can lock the rotor on the motor for as long as you like, and there will be no damage whatsoever to the motor or the Gecko. The fuses only protect the motor, and wiring, from over-heating in the case of a Gecko failure, a wiring short, or other failure.

Regards,
Ray L.

84

General Mach Discussion / Re: power supply

« on: September 05, 2013, 10:47:05 PM »

its only gess work about the weight of the gantry but its cast iron it will be between 200-300kg

ANY stepper motor will give disappointing performance on something that heavy.  You should be looking at AC servos, and unless you want to waste a WHOLE lot of time and money you better learn how to calculate the correct motor performance to get the machine performance you expect.  Building something that size based on guesswork is pretty much guaranteed to have a very bad result.  There is no substitute for measurement, modeling, and calculation.

Regards,
Ray L.

85

General Mach Discussion / Re: power supply

« on: September 04, 2013, 10:20:23 PM »

Those motors will require unreasonably high DC voltage (about 110VDC), and will have terrible high-speed performance, due to their VERY high inductance.  They're a poor choice for any CNC machine.

Regards,
Ray L.

86

General Mach Discussion / Re: ramping speed on turns

« on: August 30, 2013, 09:43:12 PM »

Ray the latest version allows you to set the corner speed based on parameters of the corner.

Just a thought   (;-) TP

Terry,

Where?  I don't see anything like that....

87

General Mach Discussion / Re: ramping speed on turns

« on: August 30, 2013, 12:27:19 PM »

There is no seperate feedrate for a radius in SheetCAM. There is one feedrate for each operation, and that feedrate is applied regardless of the type of move.  You should easily see this if you look at the G-code.  If you are over-shooting on turns, it sounds much more like you have a VERY low acceleration setting for one or more axes in Mach3 motor tuning, and it can't change direction fast enough to make the turn where it should be.

Regards,
Ray L.

88

General Mach Discussion / Re: Problem with the length of motor and encoders cable

« on: August 25, 2013, 07:43:10 PM »

I have a look at gecko manual, I found that there are only to ENC pin, the first is ENC ground the second is ENC 5VDC.
is it one of thèses pins you are tellimg me?

thanks

Robhi

ENC Gnd.

89

General Mach Discussion / Re: Problem with the length of motor and encoders cable

« on: August 25, 2013, 04:05:45 PM »

Connect the encoder cable shield to the ENC- pin on the Gecko.

If you had switch 6 off, it's a miracle it worked at all on the bench.

Regards,
Ray L.

90

General Mach Discussion / Re: Problem with the length of motor and encoders cable

« on: August 25, 2013, 12:40:05 PM »

Tuning on the bench will NOT work!  If you did not re-tune them after mounting on the machine, there is no reason to expect them to work properly.  Yes, you should use shielded cable for the encoders, with the shield connected only at the G320X.  Also, USDigital encoders are less than ideal for the G320X, and will require disabling the encoder failure detection in the G320X.  AMT encoders are MUCH preferred.  Do you have switch 6 on the G320X set to ON?  If not, they will work very poorly with those encoders.

Regards,
Ray L.