Messages

301

General Mach Discussion / Re: Perske Spindle

« on: May 05, 2006, 07:35:44 PM »

Sure it's not a Penske?   They also make high speed spindles.  Or at least I thought they did <g>

But most of these high speed spindles require an inverter (VFD drive) as Brian suggests.   Most run to 300Hz or so.

Wayne...

302

General Mach Discussion / Re: Estop

« on: May 05, 2006, 10:07:01 AM »

Bear in mind you really should have a proper e-stop chain on your machine.   This should act 1st before any s/w e-stop.

Wayne...

303

General Mach Discussion / Re: What is a CHARGE PUMP?

« on: May 04, 2006, 06:59:10 PM »

maybe you were just all "pumped" up about your mill hehehe

304

General Mach Discussion / Re: What is a CHARGE PUMP?

« on: May 04, 2006, 01:10:16 PM »

Ooops Brian I think you mean a Macropump ;-)

The charge pump thing is a circuit Mariss at Geckodrive designed to allow an extra  safety feature in cnc programs.

The circuit is a one shot circuit that turns on a relay if and ONLY if a 12.5Khz signal is seen on the input.   Mach puts out this signal if you can use it.

If the software or the pc crashes then the relay is de-energised, which can cut power to your drives etc.

Also avoids any clunking and motors turning on at bootup.

If you want to play safe then yes you need it.

Wayne...

305

General Mach Discussion / Re: DC Servo run away

« on: April 30, 2006, 09:18:01 AM »

Well thats would have some affect.   There seems to be a lot of these 3.3v ports around now, even some on desktop PC's.

Even better would be to drive your step/dir with differential signals.   Just requires a couple of chips and makes the signals so much more noise immune.  If your drive has opto's on the inputs these may already be able to take dual ended input, as long the the opto's led cathodes are not tied together.

Wayne...

306

General Mach Discussion / Re: DC Servo run away

« on: April 29, 2006, 06:03:48 PM »

Hmm What drives are you using for these servo's?

Sounds more like encoder loss runaway, or if it is on the step input side then you are getting a lot of noise on the step lines.

Wayne...

307

General Mach Discussion / Re: MOTOR LOCK-UP ON RAPID MOVEMENT

« on: April 29, 2006, 02:03:23 PM »

Steve

Whats your current "reliable" feedrate?

308

General Mach Discussion / Re: Has Mach got user timers

« on: April 29, 2006, 02:01:29 PM »

I have looked in the Mach docs and can not find any reference to timers.  The thing I was looking for was some way of turning on a auto lube pump every 10 minutes for about 30 seconds.

Graham

You could use an external timer.  Or in the case of my current project the pump does it's own timing via a sycronous motor, which triggers the pump every 6 minutes (adjustable)

Wayne..

309

General Mach Discussion / Re: MOTOR LOCK-UP ON RAPID MOVEMENT

« on: April 28, 2006, 07:40:11 AM »

PROTOBYTE PRODRIVE 2000's

OK do they have a pot for tuning the low speed like the gecko's have?   if so have they been tuned?

What is the supply voltage to these drives?

Cant remember if you mentioned your ballscrew pitch?

I notice you are still quoting speeds in inch/sec.   Do I read into that you are still on Mach2?

Not quite 20 questions ;-)


Wayne...

310

General Mach Discussion / Re: MOTOR LOCK-UP ON RAPID MOVEMENT

« on: April 28, 2006, 03:28:46 AM »

have you looked inside this driver box you have to see which drives area in there?