Messages

1881

General Mach Discussion / Re: Shuttle question

« on: December 11, 2006, 08:41:30 AM »

Change the jog inc on the Tab screen and that will change the inc move for the shuttle

1882

General Mach Discussion / Re: New CV features

« on: December 10, 2006, 10:12:19 PM »

yup we are not on the same page but we are looking at the same problem... You need to run a heigher accel to get closer to the path in CV mode BUT your router can't take the "jerk" that is being devloped by the acceleration (makes a gouge form deflection). The CV distance mode woudl work for you if you had a mill type machine that had mass and a good amout of steps per unit. I wish you could see mach 3 run a mill becasue it is SO smooth.

Brian

1883

VB and the development of wizards / Re: Need help with new macro or wizard

« on: December 10, 2006, 06:02:52 PM »

That is okay to put them here.. I think at some point I can set up a place on the FTP server

1884

General Mach Discussion / Re: trying to find information in the archives for an ah-ha conversion

« on: December 10, 2006, 05:56:20 PM »

Do you need a new computer with an AHHA card in it (I have one)

1885

General Mach Discussion / Re: New CV features

« on: December 10, 2006, 05:55:02 PM »

I have been thinking about this problem that you are having and I think I know what it is... It is the acceleration that is your trouble but the more accel that you have the more you don't like the axis starting and stopping... it is not "smooth". If you take the derivative of acceleration it is known as "Jerk"... this is known as jerk because it is the change in the Rate of change... What the heck is that! you say... Well if you look at the graph of mach3's accel it would look like this:

 -----------
|          |
|          |

The vertical walls are telling us that we are getting very high Jerk and will get a shock into the machine when we start and stop a move. The worst would be to Reverse direction!

You would like to see an accel that looks like this:

   ------------
  /              \
 /                  \

This will make for a move that will not give the sharp shock into the system.

Now for the bad news there is nothing that we can do at this time to make this work for you... You need to have Scurve acceleration to get the jerk out of the system OR you need to have more mass to stop the shock (can't be stopped as fast, and is not a good fix). If you were running a Galil we could use the S curve accel in it to smooth out the accels in your table, but that would be about 1200.00 min to get set up

Just wanted to tell you where I think you are getting the problem from.
Brian

1886

General Mach Discussion / Re: MPG-Mode Question..

« on: December 10, 2006, 05:42:08 PM »

If we were to do a true electronic gearing of the MPG to the motor you would be able to out accel the motor. The larger machines get past this by having VERY large motors. We send out moves that have the accel and deccel built into the move so users will not suffer missed steps.

Hope that helps

1887

General Mach Discussion / Re: MPG-Mode Question..

« on: December 09, 2006, 10:41:43 AM »

That is why there are two modes... Art and I have talked a bit about putting the two modes together but there are problems with trying to do that. The problems all go back to under powered machines.

Thanks
Brian

1888

General Mach Discussion / Re: Scaling a single MPG for each axis?

« on: December 09, 2006, 10:23:46 AM »

It is VERY hard to get machines to move the way that you would like because most of the machines that we run are very under powered if you crank an MPG on a large machine tool you can fault an axis... on the machines that we deal with that is missed steps.

1889

General Mach Discussion / Re: trying to find information in the archives for an ah-ha conversion

« on: December 09, 2006, 10:21:01 AM »

Please post this on the Yahoo forum and see if there is any one out there that can get you the pin out for the cable. If you ca get the pinout I can get you in contact with an engineer that makes cables for me.

thanks
Brian

1890

General Mach Discussion / Re: Funny cut

« on: December 09, 2006, 10:17:30 AM »

I wish I had the time to make stuff like that