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Messages - Ferrall

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General Mach Discussion / Re: X and Y Axis Ball Screw pitch
« on: June 30, 2008, 10:03:27 AM »
Thanks Guys
I will go ahead and get the drive pulleys and belt to do a 5 to 1 ratio.  That will give me resolution of .001 per step at 200 steps per rev.  That will be enough for a plasma cutter.  I appreciate the info and I will be using steppers.  My next item to solve is how big a motors I will need.  I will do a weight calculation on the mass that has to be moved and start working out motor size.  I will past some pictures as soon as I can. 
Thanks again, Ferrall

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General Mach Discussion / X and Y Axis Ball Screw pitch
« on: June 29, 2008, 09:49:45 PM »
Hello to all;

My name is Ferrall and I am an CNC programmer of 20 some years but new to building CNC from the ground up. I have my own machine, welding, and fabrication shop from which I build lots of things including Three Wheeled Motorcycles (Trikes). 

I am building a new CNC Plasma machine.  I already have the XY table.  It was a former CNC 3 axis plasma spray machine built by Miller Welder Co.  For a number of reasons it did not function as expected so it was abandon.  The drive table was put out as junk and I got it.  It has been robbed of the motors and controllers. The drive table is built on Thompson rod ways with ball screw drives.  The Y axis is what carries the X and Z axis so it is the heaviest.  It is on 1" Thompson rods with a 1" ball screw with a pitch of 1" per revolution.  The X axis is 3/4" with a pitch of .200" per revolution.  My very first question is can the software take into account these different pitches so I can drive the lead screws directly off the motors.  This would be the best and easiest way.  As I said "this is my first question".  I am sure there will be more as I get into the 'nitty gritty' of such a exciting project.
Thanks Ferrall

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Hi to all:
I am new to this group but not new to CNC.  I am an old CNC programmer of 20 some years. I am presently building myself a CNC Plasma system.  I will start by asking a basic question.  In Mach3 are there provisions for telling the different axis that one axis has a lead screw that is one inch per revolution and another axis is .200 per revolution?  Or is this operation handled by the motor controller?  I ask these questions because I already have a very nice XY table with ball screws of these pitches.  It will be nice if the difference in pitch can be handled in software rather than hardware (gear reduction).
I am looking forward to getting into the real mechanics of CNC not just programming.  I look forward to hearing from many of you. Thanks Ferrall

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