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Message ID: 251     Entry time: Wed May 19 09:24:32 2021
Author: Stephen 
Type: Progress 
Category: RTS for COC 
Subject: Keyence Microscope integrated into RTS Setup 

StephenA, 20 April 2021

Finished integrating the RTS Microscope Mount Assembly for the Keyence VH-Z250T lens (D2000085 WIP).

Feature description:

  • Lens assembly may be fully connected to microscope, then attached to the mount.
  • Easy on/off by passing lens assembly upward on shaft, then tightening thumb screw.
  • Locking shaft collars are added for security, once the lens is in the final position on the shaft and the thumb screw has been tightened
  • Position of lens assembly is repeatable in height and rotation.
    • Lens shaft mount (affixed by single thumb screw) registers in height and rotation against a flats cut into the vertical shaft. This provides registration of rotation about shaft axis.
    • Shaft is affixed to cantilever arm using shaft mounting blocks, including one with a set screw registering the rotation of the shaft with respect to the structure.
  • Lens shaft height and lens height may be adjusted independently to a large range of positions, using a series of thumbscrew flats and a continuous shaft registration flat.
  • Translation stage (used to focus microscope) has a hard stop in the direction toward the optic surface.

Overview of procedure for assembling the mount:

  1. Cantilevered aluminum extrusion arm is preassembled to interface plates on an optical table. Interface plates should be spaced appropriately for the destination breadboard - the spacing on a one inch grid can be confirmed on an arbitrary optical table, but the layout should be confirmed with measurements of the application.
  2. Shaft interface plates are preassembled to arm at a length along the arm that is appropriate for application.
  3. Translation stage may be preassembled to arm, or mounted in situ. Translation stage free plate is slid out of the way to access 1/4-20 clearance holes used to affix translation stage base plate to the aluminum adapter plate.
  4. Arm should be mounted to application at this stage.
  5. Shaft should be mounted to translation stage in situ, via the below process.
    1. A set screw through the base of one of the shaft mount blocks is driven into the shaft's continuous upper flat, registering the shaft's rotation. The shaft should be clamped fully on the base, with the set screw meeting the flat - needs some slight loosening of the upper clamp to attain the correct rotation.
    2. The shaft is lightly clamped into the second base, with roughly the correct alignment and spacing, which are
    3. The mount bases are placed on the translation stage, and adjustments are made with the bases gently loosened to align to the vertically-held shaft and interface to the tranlation stage threaded hole spacing.
      1. If loosening any mount block clamps, the shaft must be held to prevent a sudden drop!
    4. Overall shaft height is set by the position of the mount blocks along the shaft. Once the rotation-registering set screw is in place, shaft height may be adjusted by loosening the mount block clamps, with the mount block bases still on the translation stage.
  6. Confirm height of shaft provides clearance from optic (check for interference every time!)
  7. Add upper shaft clamp to provide a third clamping location and vertical stop.

Overview of procedure for installing the microscope:

  1. Bring the microscope lens assembly upward onto the shaft from underneath.
  2. Tighten the thumb screw into the correct flat, currently the second from the bottom.
    1. Helps to make sure the thumb screw is just outside of the ID of the mount when you start the installation, so that you can tell when the thumb screw has extended into the flat and past the OD of the shaft.
    2. I prefer to turn the thumb screw 2 turns, then gently lower the thumb screw into contact with the bottom surface of the flat. This provides a height registration and constraint for the lens assembly. Once I feel the lens assembly resting on the flat of the shaft, I then tighten the thumb screw into the vertical surface of the flat and lock in the position.
    3. Hold the lens assembly by the main body with one hand during this operaiton, to avoid dropping the lens
  3. Add the bottom shaft collar, typically stored loose above the permanent top shaft collar, to provide a redundant vertical height restraint.
  4. Use the translation stage to make any final height adjustments required to bring the optic into position under the microscope and avoid interference.
  5. Remove lens cap only when ready to bring the optic into position!

Images of mount in various states:

  1. Mount ready to host microscope lens assembly - IMG_8613
  2. Array of flats used to host the lens assembly's thumbscrew (we currently are mounted in the second from bottom flat) - IMG_8614
  3. Tightening of thumb screw, from similar POV to previous images (slightly higher zoom) - IMG_8615
  4. Lens assembly mounted and fully secured to mount - IMG_8617
  5. Overview image of lens assembly in mount; taken before fully secured, as lower shaft clamp is missing - IMG_8616
  6. Microscope hosted on small wire cart, in corner adjacent to RTS table - IMG_8467
Attachment 1: IMG_8613.JPG  2.347 MB  Uploaded Wed May 19 11:11:05 2021  | Hide | Hide all
Attachment 2: IMG_8614.JPG  2.042 MB  Uploaded Wed May 19 11:14:37 2021  | Hide | Hide all
Attachment 3: IMG_8615.JPG  2.039 MB  Uploaded Wed May 19 11:36:08 2021  | Hide | Hide all
Attachment 4: IMG_8617.JPG  2.451 MB  Uploaded Wed May 19 11:38:24 2021  | Hide | Hide all
Attachment 5: IMG_8616.JPG  3.046 MB  Uploaded Wed May 19 11:44:04 2021  | Hide | Hide all
Attachment 6: IMG_8467.JPG  1.747 MB  Uploaded Wed May 19 11:45:46 2021  | Hide | Hide all
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