More Nuts and Bolts

So the last post just got some of the fluffy nut and bolt material out of the way, here comes the good stuff!

The table top panels all get attached to mounting plates that ride in bearing tracks.  The plate itself is made of aluminum but a pair of steel runners are attached as it will wear better over the long term. 

Attaching the Steel Runners

All the Runners in Place and Ready

The plates run in bearings which are attached to the extension arms of the central column.  These extension arms have recesses for v-track bearings.  The bearings are attached with custom designed low profile bolts.  The bolts on the left hold the bearing in place with a center mounting washer.  The bolts on the right use an off-center washer to allow us to adjust the washer horizontally for a tight fit. 

A Smooth Running Plate

Twelve Extension Arms with Bearings

We then focused on the central column of components and built outwards.  The central column gives away how we have designed the vertical movement to occur in our table.  There are a series of three identical tracks around the column in which ride bearings.  As the table is rotated the bearings travel along the track and when they reach the sloped section ride up or down it to raise and lower various components of the table. 

Central Column

The segment of black tube is affixed to the silver ring and this is set into the central column.  The roller bearings are threaded into the silver ring through the slots in the central column and then the large black plate in the right of the photo is attached on top of the black tube.  The black plate is the mounting flange where the central star of the table top is attached. 

Other Parts for the Central Column

The Roller Bearing and Track

Central Column When Low

Central Column When Raised

The central column will be set within an outer column.  This outer column provides the same type of rising and falling motion for the rectangular table top panels.  As there will be some more v-groove bearings used here another set of steel rails are affixed to the outer column.   

Outer Column and Steel Rails

The outer column will be placed inside two sets of arms.  The arms provide the support for each of the wedges and rectagular panels.  When I mentioned earlier that the tolerances were amazing this is the kind of thing I was talking about.  Each of these large pieces was milled from a solid block of aluminum 36" x 36" x 2".  The sleve bushing into which the steel rod is inserted was press fit into a recess in the alluminium.  The press fit was tapped in place with a mallet and the minor amount of compression that occurs in the bushing is what keeps it in place.  An amazing fit. 

Top Set of Arms with Steel Guide Post and Self-Lubrticating Bushing

The second set of arms rides up and down on three steel guide posts that are threaded into the first set of arms. 

Bottom Set of Arms Installed on Posts

The outer column can now be set into place.  There are recesses in both the upper and lower sets of arms for v-groove bearings to guide the rotation of the parts.

Outer Column in Place in the Set of Arms

V-Groove Bearings, Note the Two With Hex Heads to Allow Lateral Adjustment

Installing the V-Groove Bearings

Once the v-groove bearings are in place the roller bearings which provide the lift for the lower set of arms by traveling in the tracks can be installed.  These are inserted from access holes which line up with the tracks on the outer surface of the outer column.  

Installing the Roller Bearings

Central Column with Mounting Flange

The outer column and the inner column can then be attached to the base plate which will eventually be attached to the base of the table.  The base plate has a dozen lobes which stick out along its circumference.  These are the attachment points for the actuator arms which provide the lateral extension of the table top.

Central Column and Base Plate

Central Column, Outer Column, and Arms all Together

Central Column, Outer Column, and Arms all Together

The actuator arms have a pair of bearings inserted where they attache to the lobes on the base plate.  They also have some press fit self lubricating sleeve bearings where they attache to the  mounting plates for the table top panels. 

Actuator Arms and Bearings

Actuator Arms and Sleeve Bearings

We only test fit one of the actuator arms to make sure it would work.  We had to stop work here as there is a part that needs to be rebuilt and it will take approximately two weeks to get the replacement.  As this is the first time assembling the parts there are still some alignment issues to be worked out.  That being said, seeing the parts come together and work as planned was quite satisfying.