Messages

1091

Show"N"Tell ( What you have made with your CNC machine.) / Re: My first project

« on: September 07, 2009, 01:40:13 PM »

Nice work and photos! Not bad at all for a first part!!! I wish my first part had been something as successful and beautiful.

How long did it take you (machining, gcode generating, CAM)?

Daniel

1092

*****VIDEOS***** / Re: New Video of Mach/Ajax Cnc system cutting complex surface @ 250"ipm

« on: September 07, 2009, 01:19:11 PM »

Terry,

I'm with you on that. When the guy holds the workpiece at the end you can estimate the workpiece length to be about 7". And it takes about 5 seconds to travel that distance, which means a feed of even less than 100ipm. And the feed looks even through whole the process indeed - no difference between 100ipm and 300ipm can be seen.

One other thing I noted in the video is the feed DRO displaying the speed spot on - no fluctuation. Have never seen this in Mach3 neither with PP or SS. Mine always shows slightly lower value that keeps bouncing over.

Daniel

1093

Modbus / Re: Mach modbus inteface info?

« on: September 06, 2009, 02:17:08 PM »

Hi Mark,

I am considering buying a HuanYang VFD. Had been collecting some information on it and came across this thread.

I'm curious, have you got it solved yet?

Thanks,
Daniel

1094

Show"N"Tell ( Your Machines) / Re: The Laser Project.

« on: September 02, 2009, 01:36:04 AM »

It's going to be an interesting project, Tweakie.

Is the box made of aluminum? It looks very well made - did you use some kind of bending machine or fixture? How did you cut it?

BTW, thought a 30W laser would be enough to cut through a thin aluminum foil...?

Daniel

1095

Third party software and hardware support forums. / Re: Simple spindle setup Mach3 + BOB CNC4PC C11 (R6.1)

« on: August 31, 2009, 12:49:51 AM »

Hi Risto,

I don't think it is the way it meant to be, so I'd suggest again consulting Arturo.

Daniel

1096

SmoothStepper USB / Re: Is there a way of feedholding faster with SS?

« on: August 30, 2009, 08:37:46 AM »

What do you have set for controller frequency? Try setting it at 2MHz, it should then take only about a second for the feed hold to take effect. 4MHz frequency will reduce the response time even further.

But in general Greg is about finished a new plugin which will return the feedhold (as well as FRO) back to Mach and thus making it instantaneous like with the PP.

Daniel

1097

FAQs / Re: About AC and DC Servo Drive (CNC conversion)

« on: August 29, 2009, 02:14:04 PM »

I don't think I understand your question. Your limit is not the speed, but rather the continuous torque. An AC servo can practically deliver almost constant torque throughout its whole speed range.

I am not saying you can't use that motor, but simply that by using it you'd reduce your machine's axes power rating. You'll still be able to cut most of the things you have been doing so far. But if so far your machine's limit was for instance 30mm diameter face mill with a 5mm depth of cut, with the new motor it is going to be 3.4mm depth of cut. If that's fine for you then I guess you can use that motor.

Daniel

1098

FAQs / Re: About AC and DC Servo Drive (CNC conversion)

« on: August 29, 2009, 01:19:20 PM »

What matters in choosing a motor for a job is its continuous stall torque. So if the continuous rated torque is less than required for the given application, the motor is not suitable! Unless you are willing to compromise on the continuous power you axes can deliver I wouldn't choose that motor.

It is true that AC servos outperform DC servos, but NOT in the sense you can operate them continuously at their peak ratings (or anything higher than the continuous ratings). AC servos usually have higher peak ratings than DC ones, and they can operate for longer times at their peak ratings, but by no means continuously!

Daniel

1099

General Mach Discussion / Re: Replacing a Resolver of an AC Servo with an Encoder

« on: August 28, 2009, 01:15:41 PM »

Nosmo,

Thanks for clearing things up. Now it makes sense to me

Daniel

1100

General Mach Discussion / Re: Replacing a Resolver of an AC Servo with an Encoder

« on: August 28, 2009, 09:59:10 AM »

Once read somewhere (can't recall where exactly) :

Found where I read it. See bottom of page 26 and 27.

http://www.techno-isel.com/H835/835DownLoad.asp?Page=H835_Cat

Daniel