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  #11  
Old 06-16-2011, 07:13 PM
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Default Stepper Motor:

A motor for a CNC machine that when given one pulse will move one step. It normally has no feedback to the driver so there is no error checking in this system as far as loss of position. Each axis will have at least one of these motors and possibly two.
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  #12  
Old 06-16-2011, 07:14 PM
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Default Bridge/Gantry:

The part of the CNC machine that reaches across the table to the other side. It will usually move back and forth on the Y axis and the X travels from left to right on the bridge. Z is usually situated on the X axis.
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  #13  
Old 06-16-2011, 07:14 PM
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Default Vfd:

A variable speed driver or inverter. It is used to control the RPM of a spindle.
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  #14  
Old 06-16-2011, 07:16 PM
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Default Spindle:

A variable RPM router. The RPM is usually controlled by a VFD.
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  #15  
Old 06-16-2011, 07:20 PM
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Default Homing the machine:

When the machine is set up correctly, you should be able to type G28 and hit Enter and the machine should lift the Z to the top until it triggers the Z limit switch. It then moves either both the X and Y simultaneously or one at a time to their lowest points until the limit switches are hit on these axes. After triggering all three switches, the machine should move off the switches a set amount and zero all axes. This is HOME position on the machine.

Same as Initialize
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  #16  
Old 06-16-2011, 07:21 PM
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Default Limit switch:

Most CNC machines have at least 3 switches mounted on the CNC machine that allow for homing the machine. One will normally be located on the left most side of the X axis, another on the front most end of the Y axis, and the third should be located at the top most end of the Z axis. These switches are wired into the controller in such a way that when they are triggered they will stop motion on at least that axis. WinCNC uses these switches to home the machine.
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  #17  
Old 06-16-2011, 07:23 PM
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Default Soft limits:

Limits set in the software that will not allow the machine to move beyond a certain point. These limits work very well if the machine has been homed correctly and if the limits are set up correctly in the wincnc.ini file. When a soft limit is about to be exceeded, an error message appears on the WinCNC screen.error message appears on the WinCNC screen.
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  #18  
Old 06-16-2011, 07:24 PM
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Default Spoil board:

A sheet of material that is laid onto the surface of a CNC machine. This will be the zero surface on which all of the cuts will be performed. Most operators use MDF (medium density fiberboard) or LDF (low density fiberboard) for this purpose. These materials hold their surface shape fairly well after they have been milled and allow the use of vacuum to hold parts because they are very porous. Many users opt to hold the spoil board down with glue. Others even use screws or bolts to hold it. The main thing is that once it is mounted it is milled flat with the router/spindle.
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  #19  
Old 06-16-2011, 07:28 PM
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Default Milling a spoil board:

Using a tool, usually a fly cutter or large end mill, to shave a small amount of material from the spoil board for the purpose of flattening the surface. This is done when the spoil board is first set on the machine and also after it has been cut up sufficiently to not allow parts to lie flat and be secured properly.

With the case of using a vacuum table mill both sides of the spoil if it has a slick surface.

Most people use MDF or LDF as a spoil board. Other material that can be used is;
  • Peg Board
  • Ply Wood
  • Aluminum

But MDF is cheep and comes in many sizes and thickness.
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  #20  
Old 06-16-2011, 07:29 PM
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Default Wincnc:

The best dang motion controller available.
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