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Messages - Jeff_Birt

571
It is probably just the way he is grabbing the position. No need for fancy macros here, as other have suggested just command a move in the MDI and then look at the DRO...

572
General Mach Discussion / Re: Little help Please
« on: June 12, 2010, 10:13:44 AM »
Glad you got it sorted...

573
First, if your converting an old knee mill you will NOT get 0.0001" accuracy. Even if you add brand new fancy ball screws and such you'll see more error from cutter deflection, cutter wear, material changing size as it heats/cools, etc, etc.

Second, Mach will always send out enough pulses to go where you tell it to within the resolution of your steps/unit. If you only have 2,000 steps/unit then you will see some non-cumulative rounding issues at certain numbers (as everything is broken down into 1/2000" increments). Again, lets stop and consider what that 0.0001 means in the real world...unless you have a very hi precision machine, operating in a temperature controlled environment, that you have done screw mapping on, let warm up to two hours before cutting parts,etc, etc; you just won't see it.

574
General Mach Discussion / Re: Little help Please
« on: June 12, 2010, 09:26:16 AM »
You need to tell Mach to use the SS as the motion device. Go to Function Cfgs->Reset Dev Sel. The next time you restart Mach it will ask you which motion device to use, select the SmoothStepper.

575
General Mach Discussion / Re: x motor jerking and acting up
« on: June 09, 2010, 09:29:15 PM »
Could be a broken wire in the stepper cable. With the power off you can swap cables from one axis to the other to find out.

576
The important tihng is to insure that it will never have to switch more than 0.1w. Most inputs are high impedance, i.e. draw very little current, so this is not a problem, at 24V you would have a limit of 4ma. What type of BOB are you working with?

577
I have a new MPG control available on my website now: http://soigeneris.com/CNCMPG_Controls.aspx . It measures about 1.5" x 1.0" x 0.5" and is intended for use as an over ride control. It comes with the mounting hardware and 1" knob PLUS a plug-in for Mach 3. The plug-in adds velocity sensitive acceleration to the control so the amount of movement it reports is dependant upon how fast you are turning it (sort of how your mouse works.) They work great and are very easy to configure. You can download the users manual for more complete information.

578
General Mach Discussion / Re: A very weird prob... pls assist...
« on: June 05, 2010, 05:08:22 PM »
I would try using an M1 (optional stop) or an M6 (tool change) an M0 is a 'Stop and Reset' command and it could be fouling things up for you.

579
SmoothStepper USB / Re: SmoothStepper with Windows 7
« on: June 05, 2010, 04:37:52 PM »
Yes it works great in Windows 7. You have to manually install the driver though. Go to device manager, find the SmoothStepper (should have a yellow ? beside it). Right click on it and select properties. When the properties window pops up you need to click the 'Update Driver' button and then navigate to where you have the driver saved.

580
General Mach Discussion / Re: A very weird prob... pls assist...
« on: June 05, 2010, 12:56:52 PM »
Hi Yianni,

My first thought when I got your note was tool offsets being applied as Graham and Hood have eluded too. I have been contemplating possible tests to verify machine operation. One easy way to test the machine operation apart from any generated GCode is to use the MDI line. With the Z-axis zeroed with the tool touching the top of the stock, moving the Z to -2mm and then cutting a slot should show a 2mm deep slot. Another options is to use one of the built in Wizards in mach to do some simple operation.

In your CAD/CAM program you could make two concentric pockets the outer 2mm deep and the inner 4mm deep. If the outer pocket is shallow and the inner is 2mm deeper than the outer you know your CAM is putting in a tool offset.