Messages

1

General Mach Discussion / Re: Gantry Alignment Issue

« on: July 13, 2010, 10:09:28 PM »

not really sure if it is one side or the other, only that the gantry gets cocked due to one side driving more than the other.  I would think that if both are being provided the EXACT same pulses, this would be impossible given a rigid frame and quality linear bearings.  Is there an accurate way to measure which side is doing what?

2

General Mach Discussion / Re: Gantry Alignment Issue

« on: July 13, 2010, 07:45:47 AM »

Drives are Automation Direct 1288's  running at 70v DC.
Gearbox is 5:1 planitary
drive pinion is 1.5 x 20mm on a 1500mm rack

Gantry length is approx 6 feet with 49" of travel.  machine reaches 49" x 52"

Identical setup on Y axis, getting consistant speeds at 700 ipm with no loss in positioning accuracy.  I understand the concept of bigger not always being better, but acting alone, they will run at 700 ipm.  only when both side have to drive at peak speed do i have an issue.  Lower speeds products perfect results.

3

General Mach Discussion / Gantry Alignment Issue

« on: July 12, 2010, 02:58:34 PM »

Looking for help with a gantry driven CNC Router custom build.  Equipment summary:

Dual 1288 oz steppers, Automation Direct, with 5-1 gearbox and rack and pinion.  (X with A slaved)  
A defined as linear
both drives wired to different pins on port with A's direction reversed.
When running manually, all is well, put under higher speeds, 300 ipm, i seem to be loosing steps.  
Any idea to ensure how X and A get the exact same input?  Both have been verified to have and identical motor tuning model.

Any ideas would be greatly appreached.