CNC Multimachine Specification - Revision history

Marcin at 04:13, 20 February 2012

2012-02-20T04:13:55Z

← Older revision		Revision as of 04:13, 20 February 2012
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	*Structural scaling may be obtained via addition of a strengthening module to the motion assembly. To accommodate this, a block with a large section modulus may be bolted or otherwise fastened to the surface of the rail/precision drive assembly. Typically, a workpiece-holding table is attached to the rail/precision drive assembly. In the case of machine scaling, an intermediate reinforcing piece may have to be used.		*Structural scaling may be obtained via addition of a strengthening module to the motion assembly. To accommodate this, a block with a large section modulus may be bolted or otherwise fastened to the surface of the rail/precision drive assembly. Typically, a workpiece-holding table is attached to the rail/precision drive assembly. In the case of machine scaling, an intermediate reinforcing piece may have to be used.
	*Module can be arranged horizontally (lathe for holding chuck and tailpiece, or table of a mill) or vertically (such as the holder for the drilling head on a drill)		*Module can be arranged horizontally (lathe for holding chuck and tailpiece, or table of a mill) or vertically (such as the holder for the drilling head on a drill)
	*Module is attached to a monolithic, concrete block to provide mass and structure to counteract vibrations		*'''Module is attached to a monolithic, concrete block to provide mass and structure to counteract vibrations'''
	*Modules can be stacked one upon the other. This is clear for the x and y axes, but this is also the case for z motion, where the x and y axes can be attached to the z via a right-angle bracket		*Modules can be stacked one upon the other. This is clear for the x and y axes, but this is also the case for z motion, where the x and y axes can be attached to the z via a right-angle bracket
	*These modules are operated manually with a turning wheel, but the turning can readily be retrofitted with stepper motors or servos for CNC control		*These modules are operated manually with a turning wheel, but the turning can readily be retrofitted with stepper motors or servos for CNC control

Marcin at 06:50, 17 February 2012

2012-02-17T06:50:28Z

← Older revision		Revision as of 06:50, 17 February 2012
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	*Modules can be stacked one upon the other. This is clear for the x and y axes, but this is also the case for z motion, where the x and y axes can be attached to the z via a right-angle bracket		*Modules can be stacked one upon the other. This is clear for the x and y axes, but this is also the case for z motion, where the x and y axes can be attached to the z via a right-angle bracket
	*These modules are operated manually with a turning wheel, but the turning can readily be retrofitted with stepper motors or servos for CNC control		*These modules are operated manually with a turning wheel, but the turning can readily be retrofitted with stepper motors or servos for CNC control
			*Modular rotary axis of motion is also a module in this design - for rotary precision motion

	=Design for Fabrication: Simplicity and Modularity=		=Design for Fabrication: Simplicity and Modularity=

	*Simplicity and modularity are the keys to keeping the fabrication costs of this precision motion system as low as possible. For this reason, a structural block of concrete is used as a base for the machine (horizontal or vertical). Modularity stipulates that once the design for a single axis is obtained, it can be used on the other axes – thereby simpifying both design time and reducing fabrication time as the same pieces need to be fabricated.		*Simplicity and modularity are the keys to keeping the fabrication costs of this precision motion system as low as possible. For this reason, a structural block of concrete is used as a base for the machine (horizontal or vertical). Modularity stipulates that once the design for a single axis is obtained, it can be used on the other axes – thereby simpifying both design time and reducing fabrication time as the same pieces need to be fabricated.
	*Design for fabrication should be employed to simplify fabrication procedures, reducing cost		*Design for fabrication should be employed to simplify fabrication procedures, reducing cost
	*The design should be such that the precision motion element is an off-shelf device such as a lead screw, but the structural rail holding system should consist of stock steel or metal. Stepper motors may be bought.		*The design should be such that the precision motion element is an off-shelf device such as a lead screw, but the structural rail holding system should consist of stock steel or metal. Stepper motors may be bought.
	*Design assumes that in order to reduce material costs, stock steel can be machined, hardened, and precision ground. It is assumed that the fabricator of this machine has access to a surface grinder, milling machine, and a heat treating system such as an induction furnace that can be used to harden materials as needed.		*Design assumes that in order to reduce material costs, stock steel can be machined, hardened, and precision ground. It is assumed that the fabricator of this machine has access to a surface grinder, milling machine, and a heat treating system such as an induction furnace that can be used to harden materials as needed.

	*Modular rotary axis of motion for rotary motion
	*Modular reinforcement for scaling linear axes		*Modular reinforcement for scaling linear axes
	*Assumes stock steel, case hardened and surface-ground to precision		*Assumes stock steel, case hardened and surface-ground to precision
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	*Interchangeable heads		*Interchangeable heads
	*Indexing head is also motor head		*Indexing head is also motor head

			[[Category:Specifications]]

Marcin: /* Design for Fabrication: Simplicity and Modularity */

2012-02-17T06:47:48Z

Design for Fabrication: Simplicity and Modularity

← Older revision		Revision as of 06:47, 17 February 2012
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	*Interchangeable heads		*Interchangeable heads
	*Indexing head is also motor head		*Indexing head is also motor head
	*

Marcin: Created page with "Cartesian Precision Motion Construction Set – 3 axis motion systems for precision machining. The basic design is for a precision motion system (down to ½ thousandth of an inc..."

2012-02-17T06:44:29Z

Created page with "Cartesian Precision Motion Construction Set – 3 axis motion systems for precision machining. The basic design is for a precision motion system (down to ½ thousandth of an inc..."

New page

Cartesian Precision Motion Construction Set – 3 axis motion systems for precision machining.

The basic design is for a precision motion system (down to ½ thousandth of an inch with zero backlash) based on a modular design of structural holding table, drive, and structural precision rail system for linear motion. Further, this precision motion system is extensible, or scalable – via a mechanism for attaching consecutive motion system members to extend the length of the precision motion system.
*Force requirements are 1000 pounds of downward pressure in drilling operations
*Force requirements are 1000 pounds of sideways pressure in milling operations
*Table workpiece holding requirements are up to 500 lb workpieces
*Basic size of precision motion module is 9 by 18 inches for the rail and table
*These modules can be added linearly to accommodate any length of machine, such as a lathe with a 6' bed
*The componentized structure of each motion axis should include: (1) precision drive: precision drive system such as a ball lead screw; (2) Rail system: rail/slide system to provide both precision and structural holding strength of the motion system while under the stresses caused by machining operations; (3) Reinforcement - a reinforcing component placed on the rail/slide system may be used whenever the motion system is scaled, which may be necessary to accommodate the additional strain associated with increased machine size
*Structural scaling may be obtained via addition of a strengthening module to the motion assembly. To accommodate this, a block with a large section modulus may be bolted or otherwise fastened to the surface of the rail/precision drive assembly. Typically, a workpiece-holding table is attached to the rail/precision drive assembly. In the case of machine scaling, an intermediate reinforcing piece may have to be used.
*Module can be arranged horizontally (lathe for holding chuck and tailpiece, or table of a mill) or vertically (such as the holder for the drilling head on a drill)
*Module is attached to a monolithic, concrete block to provide mass and structure to counteract vibrations
*Modules can be stacked one upon the other. This is clear for the x and y axes, but this is also the case for z motion, where the x and y axes can be attached to the z via a right-angle bracket
*These modules are operated manually with a turning wheel, but the turning can readily be retrofitted with stepper motors or servos for CNC control

=Design for Fabrication: Simplicity and Modularity=
*Simplicity and modularity are the keys to keeping the fabrication costs of this precision motion system as low as possible. For this reason, a structural block of concrete is used as a base for the machine (horizontal or vertical). Modularity stipulates that once the design for a single axis is obtained, it can be used on the other axes – thereby simpifying both design time and reducing fabrication time as the same pieces need to be fabricated.
*Design for fabrication should be employed to simplify fabrication procedures, reducing cost
*The design should be such that the precision motion element is an off-shelf device such as a lead screw, but the structural rail holding system should consist of stock steel or metal. Stepper motors may be bought.
*Design assumes that in order to reduce material costs, stock steel can be machined, hardened, and precision ground. It is assumed that the fabricator of this machine has access to a surface grinder, milling machine, and a heat treating system such as an induction furnace that can be used to harden materials as needed.

*Modular rotary axis of motion for rotary motion
*Modular reinforcement for scaling linear axes
*Assumes stock steel, case hardened and surface-ground to precision
*Assumes surface grinder and mill are used in its construction up to a 4' working bed
*Can be used to make a mill or lathe
*hydraulic motor drive, flow control for speed control
*Interchangeable heads
*Indexing head is also motor head
*