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General Mach Discussion / GANTRY RACKING
« on: January 17, 2012, 06:32:58 PM »
I'm running a home made CNC with separate steppers on the 'long' axis: with A slaved to X.
Once or twice, due to my cabling/construction (not MACH3), one of the ballscrews has got out of step with the other and the gantry has racked badly.
I'm thinking of fitting quadrature shaft encoders to the A and X axis to raise an E-STOP if the A and X axis move different distances.
I'll probably use some quadrature decoder chips and a microprocessor to do the job.
Before I start the work, am I re-inventing the wheel or is there a better/simpler solution?
I'm a 'hobby type' CNC user and don't have the means of making a 'rock solid' mechanical solution so an electronic safeguard seems the way to go?
regards Bill Legge
In Australia
Once or twice, due to my cabling/construction (not MACH3), one of the ballscrews has got out of step with the other and the gantry has racked badly.
I'm thinking of fitting quadrature shaft encoders to the A and X axis to raise an E-STOP if the A and X axis move different distances.
I'll probably use some quadrature decoder chips and a microprocessor to do the job.
Before I start the work, am I re-inventing the wheel or is there a better/simpler solution?
I'm a 'hobby type' CNC user and don't have the means of making a 'rock solid' mechanical solution so an electronic safeguard seems the way to go?
regards Bill Legge
In Australia