Cold Saw/V1 Design Rationale

From Open Source Ecology
Jump to navigation Jump to search

Conceptual Parameters

  • Baseplate
  • 2 Fixed Blocks (mounted to baseplate by XXX, 2 shaft holes, 1 threaded rod hole)
  • 1 Moving Nut Block (rides on 2 shafts, driven by a threaded rod that moves a nut welded to the block)
  • 2 Shafts (radially held on the Fixed Blocks, axially held by 2 shaft couplings on the outsides of the Fixed Blocks)
  • 1 Threaded Rod (radially held on the Fixed Blocks, axially held by 2 thrust washers and 2 shaft couplings on the outsides of the Fixed Blocks, drives a nut welded to the Moving Block)
  • 1 Clamp Handle (welded to the Threaded Rod)

Block to Baseplate Mounting

  • Permanent mounting methods include welding.
  • Modular mounting methods include:

Bolt into countersinked baseplate hole into block hole into nut.

Screw into countersinked baseplate hole into tapped block hole.

Screw into block hole into tapped baseplate hole.

Threaded Rod and Shafts Radial and Axial Hold

  • The shafts can be radially supported by inserting through a block at each end; axially supported by shaft collars at each end on the outside of the blocks.
  • The threaded rod does not require much radial support as the shafts handles the brunt of it. Axial load is handled by thrust washers or bearings to be mounted between the blocks and shaft collars on the ends of the threaded rod.

Shaft Collars and Thrust Washers Selected

Clamp Threaded Rod and Shafts Positioning

The blade must not contact the Threaded Rod at any cut angle.

Therefore a space must exist between the blade bottom-out and Threaded Rod at all cut angles.

We want the clamp volume to be as close to the Baseplate as possible for minimizing material usage and improving Fixed Block rigidity. Lower height of blade bottom-out allows the clamp volume to be closer to the Baseplate. Below the blade bottom-out plane must be a space, then the Threaded Rod.

Therefore the Threaded Rod must be as close to the Baseplate as possible.

The shafts must balance the Threaded Rod's driving force and the workpiece's reaction force such that the Threaded Rod and Moving Block do not bend.

Specific Parameters

Retrieved from "https://wiki.opensourceecology.org/index.php?title=Cold_Saw/V1_Design_Rationale&oldid=62798"