Engineering Drawings and CAD Files
Table of Contents
Revision History and Design Modifications
Wheel Interface & Rotation SystemWeek 9 The initial design. Consists of a rotation shaft that will rotate the table when needed to orient the table vertically.
Week 10 Added a wheel to the end of the rotation shaft. This allows for easier inputs from the user to rotate the table. It reduces the torque required to rotate the table and orient it vertically.
Week 11 Lowered the rotation shaft so that the axis of rotation runs through the center of mass of the table. This allows for the table to be centered on the device when vertical and eliminates concern of tipping while the table is vertical.
Week 12 The rotation system has been modified so that the rotational axis of the table and the ball screw lifting axis can be centered along the center of the masses they are moving. To accomplish this we propose putting a gearing system inside the vertical lifting component which will move with the rotation of the ball screw and attach to the table jaws.
Week 13 A cross-bracing rib was added to the gear box running through the middle of the part. This is designed to support the gear shaft running across the part and to give the part more strength in general.
Week 14 A slot was cut out of the output shaft of the gear box. This will interface with a keyed shaft bushing that will transmit the output torque to the back plate that will rotate the table in the jaws.
Week 15 A locking pin mechanism has been added to the wheel to restrict rotation when not desired.
Lifting Jaw RevisionWeek 9 The initial design consisting of a simple L-frame with a series of through holes to be used for 1/4-20 screws that will assist with lifting and rotating the table.
Week 10 Added ribs to support that L-frame. This will provide more strength to the part. Added 1/4-20 holes to the vertical face to allow for easier connection to the back plate. Changed holes on horizontal face to slots to allow for more forgiveness when connecting jaws to table.
Week 11 Lengthened back plate and added jaw to bottom of the table to support when lifting. This jaw is connected in the same manner as the top jaw.
Week 12 No changes.
Week 13 Removed several ribs on joint of jaw to reduce material. Three ribs are determined to be sufficient for strength needed.
Week 14 Replaced 1/4-20 screws on vertical face with 1/2-13 bolts for strength. Created slotted connection for jaws to make top jaw adjustable. Also added holes to back plate for shaft bushing to connect rotational shaft to back plate.
Overall Frame & Table OrientationWeek 9 The initial design that uses 5" castor wheels and a symmetric H-frame layout for the base made of 4X4 inch square tubing. The vertical columns are also 4X4 inch square columns. Slots have not been added for the sliding mechanism.
Week 10 Slots are added the the vertical columns to allow the sliding piece of the lifting mechanism to move in the vertical direction when prompted by the twisting of the ball screw. The H-frame base is altered to shorten the length of the device.
Week 11 The vertical columns are altered to fit the style of a 1/4 inch wall U-channel. The sliding mechanism is altered to reflect this change.
Week 12 The lifting and rotational components now lie in the same plane. The fram is altered to support this change.
Week 13 3" castor wheel are now used at the base. The H-frame base is changed to 2X2 inch square tubing to reduce weight and cost.
Week 14 A dummy part is added to the bottom of the frame to hold the place of a brake that will be purchased and bolted to the bottom of each H-frame.