Cold Saw/V1 Design Rationale/Hold System: Difference between revisions

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*'''Auto-Centering Vise: improves cut quality and fits more workpiece sizes and shapes'''
=Hold System Notes=


[[Image: ColdSawV1Clamp.png]]
*The hold system should be rigid relative to the mounting surface of the Cold Saw such that modularity exists for automatic linear feed from the side. If the hold system was loose or meant to turn, the linear feed system would have to rotate precisely as well- given the high weight and low mechanical advantage associated with such an operation, a moving hold system is suboptimal relative to a moving blade rotation system.


Auto-centering occurs because the 2 moving blocks move towards and away from the center when the handle is rotated one way or the other. The handle is welded at its center to a threaded rod; when the threaded rod rotates, the left-handed nut and right-handed nut move relative to the threaded rod. The threaded rod is held in place relative to the fixed block by shaft collars. Because the threaded rod does not move relative to the fixed block, the nuts  must move relative to the fixed block. The nuts are welded to the outside faces of the moving blocks such that when the threaded rod rotates, the nuts, and hence the moving blocks, move relative to the fixed block.
*If a part of the Cold Saw has high rigidity with contact on the mounting surface, then superior mounting rigidity is achieved. In addition, the swivel system will require a surface to slide on and a surface to clamp onto, hence a rigid base (a plate would be effective) is ideal for the Cold Saw as opposed to mounting the hold system directly to the Cold Saw's mounting surface.


The shaft collars prevent the shafts and threaded rod from moving under friction and handle rotation, respectively.  
*The remaining aspect of the hold system, the mechanism to clamp the workpiece, can be called the vise.


The thrust washers minimize friction caused by the rotation of the threaded rod's shaft collars under clamping tension.
=Concepts=


Cut Location Notes: If the cut occurs at the center of the clamping volume, we achieve maximum clamping rigidity and optimal vise dimensions to facilitate angled cuts (because the vise needs a wide mouth for angled cuts, better to go wide from the center than anywhere else for maximum rigidity and dimensional uniformity).
[http://opensourceecology.org/wiki/Cold_Saw/V1_Design_Rationale/Hold_System/Vise Vise]


Cut Depth Notes: At all possible cut angles, the blade must not contact the vise.
[http://opensourceecology.org/wiki/Cold_Saw/V1_Design_Rationale/Hold_System/Base Base]
 
Vise Dimensional Notes: The vise achieves maximum rigidity and minimum material usage when its clamping volume is as close to its mounting surface as possible.

Latest revision as of 19:37, 11 June 2012

Hold System Notes

  • The hold system should be rigid relative to the mounting surface of the Cold Saw such that modularity exists for automatic linear feed from the side. If the hold system was loose or meant to turn, the linear feed system would have to rotate precisely as well- given the high weight and low mechanical advantage associated with such an operation, a moving hold system is suboptimal relative to a moving blade rotation system.
  • If a part of the Cold Saw has high rigidity with contact on the mounting surface, then superior mounting rigidity is achieved. In addition, the swivel system will require a surface to slide on and a surface to clamp onto, hence a rigid base (a plate would be effective) is ideal for the Cold Saw as opposed to mounting the hold system directly to the Cold Saw's mounting surface.
  • The remaining aspect of the hold system, the mechanism to clamp the workpiece, can be called the vise.

Concepts

Vise

Base

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