Messages

5101

General Mach Discussion / Re: Servio motor Delta adas b2 Software and electronic gear ratio

« on: March 06, 2018, 04:54:30 PM »

Hi,
should explain..Machs 'kernel' refers to the parallel port pulse engine. As you are using an ESS you are not using
Machs parallel port and therefore its pulse speed limitation is irrelevant.

therefore I should have a 4:1 electronic gear ration in order to force the motor
to run at higher speed of 4*685=2740 ?

If you run the motor at four times the speed the axis will move four times as fast UNLESS you use a different reduction
gearbox. "Electronic gearing' has no bearing on that.

Craig

5102

Mach4 General Discussion / Re: Mach4 Button OFFLINE

« on: March 06, 2018, 04:28:58 PM »

Hi,
I presume that you still have a toggle button and therefore require two scripts, one for each toggle state.
If thats the case then the code you have posted looks good.

Good work.

Craig

5103

General Mach Discussion / Re: Servio motor Delta adas b2 Software and electronic gear ratio

« on: March 06, 2018, 04:24:13 PM »

Hi,
if your machine can handle speeds approaching 1m per second and handle the G forces involved then
you have a  pro machine and should not be pissing around with Mach.

Who cares abouts Machs kernel? You are running an ESS, its 'kernel' if thats what you want to call it is 4Mhz.

Without electronic gearing you could still make the axis go four times faster just by increasing the pulses per second
from 114k to 456k. Differential signalling required but no change in electronic gearing required.

The torque from an AC servo is indepenednt of speed, it has no more torque at high speed than at low speed. So I don't
agree you'll get any more performance by going faster. In fact unless you plan the decceleration phase properly
and have the servo fault on decel then you risk a crash.

5104

General Mach Discussion / Re: Will not zero machine coordinates

« on: March 05, 2018, 10:38:37 PM »

Hi ger21,
yes thats correct however as I'm now using Mach4 I can do that too, there again grey matter only required.

Craig

5105

General Mach Discussion / Re: Will not zero machine coordinates

« on: March 05, 2018, 07:01:25 PM »

Hi ger21,
thanks for that.

I've found it perfectly adequate to specify a home offset then have a macro drive the axis to machine
zero after the homing routine. It achieves the same result, just requires me to excerise my grey matter.

Craig

5106

General Mach Discussion / Re: Will not zero machine coordinates

« on: March 05, 2018, 06:39:35 PM »

Hi,
found the reference, its not CNCDrives products but PoKeys  that has the ability to back off a given number
of counts.

http://www.machsupport.com/forum/index.php/topic,36634.msg251918.html#msg251918

Craig

5107

General Mach Discussion / Re: Using two uc100, with mach3. gecko540 and mach3 interfaceboard.

« on: March 05, 2018, 04:00:31 PM »

Hi Dude1,
have you seen the price on that sucker! Last quote I had from MS in Austrailia $16,000US without licences,
thats just the tools!

Craig

5108

General Mach Discussion / Re: Servio motor Delta adas b2 Software and electronic gear ratio

« on: March 05, 2018, 09:21:29 AM »

Hi,
have been reading the manual and it turns out you can program the encoder count. Page 7-40.

P1-46▲ GR3 Encoder Output Pulse Number Address: 015CH
015DH
Operation
Interface: Keypad/Software Communication Related Section: N/A
Default: 2500
Control
Mode: ALL
Unit: pulse
Range: 4 ~ 40000
Data Size: 32-bit
Display
Format: Decimal
Settings:
This parameter is used to set the pulse numbers of encoder outputs per motor
revolution.
Please note: When the following conditions occur, the output frequency for pulse
output may exceed the specification and cause that the servo drive fault AL018
(Encoder Output Error) is activated

Note the default is 2500 ppr which corresponds to an encoder count of 10,000 counts per rev.

My suggestion is stick with that.

The calculations change:

12000/175=68.571428
68.571428 *10=685.7142
685.7142 *10,000/60=114285.7142 pulse per second. or 114.2855kHz

ie You don't need electronic gear reduction at all.

The 'steps per mm':
1 /175=0.005714285
0.005714285 *10=0.05714285
0.05714285 *10000=571.428 pulse per mm

This is easier again. Program the servo to produce 10000 count (2500 ppr), which is its default programming. As you only require 685 rpm to reach
your target speed with a 10:1 reducer you don't need electronic gearing. The maximum pulse rate required is 114 kHz and within the drives singled ended
signaling capacity, easy.

Craig

5109

General Mach Discussion / Re: Will not zero machine coordinates

« on: March 05, 2018, 08:33:16 AM »

Hi,
Mach only backs off so the switch unmakes, usually only a fraction of a mm from where the switch first operated.

The sequence of events:
1) If the Z axis is the first axis to home as declared in the homing order setting
2) The Z axis drives in its nominated direction and at its nominated speed until the Z axis home switch makes contact
3) The Z axis stops and then reverses until the switch un-makes, usually a fraction of a mm
4) The Z machine coordinate is zeroed, or set to the Home Offset value if so programmed.
5) The next axis in the home sequence is activated.

Note in step 4) if the home offset is set to 25mm say, the Z machine coordinate is set to 25mm, the axis DOES NOT back off 25mm.

I have in recent days been told that one of the popular motion controllers can, if programmed, drive to a 'back off' location. This is done by the controller
not Mach. I think it might be the UCnnn series from CNCDrive. Note it is the controller that does this not Mach and is not standard Mach behavior.

Craig

5110

General Mach Discussion / Re: Using two uc100, with mach3. gecko540 and mach3 interfaceboard.

« on: March 05, 2018, 05:14:01 AM »

Hi Dubble,
I know that you have recently released Mach4 plugins for the UC100 but I believe also the UC300 and UC400.
Does the Mach4 plugin provide THC support?

Craig