Lectern – Part four

I’ve long believed that if we come up with better ideas as we are building something the plan needs to be adjusted. Sometimes it means a little more time or materials but the whole idea of doing this kind of work is to do the very best we can possibly do.

After the weekend off I came back into the shop to work on the lectern.  I assembled the base and set the stand back on. As I did some finishing and fitted the gears I decided they were just too far apart from the base. After looking things over I decided the gears that theoretically adjust the tilt of the table needed to be part of the brackets rather than stand alongside. The solution required parking the gears and then cutting them to fit around the brackets. A little sculpting epoxy blended the seams together nicely.

There is still some small bits to route and assemble but it won’t be long until it is time for paint. 

Published with permission from precisionboard.blogspot.com. Source.

Lectern – Part three

 The upper portion and motor base of the lectern stand was a challenging piece to build. There were a number of ways I could have handled it but I chose to do it with a combination of domed reliefs and one mesh. The piece we were building today was shaped a bit like a funnel with a horizontal tube in the middle and a lightbulb shaped thing on the top. An axle would go through the top part for the big gears and through the horizontal tube (‘motor’) for the smaller gears.

The round bulb was the first and easy relief using the dome tool.

The round horizontal shaft was next. Again I used the dome tool to create this relief. I would cut the rounded ends off later.

Next up was the side down funnel shaped base. The mesh tool was used for this shape. I drew out the vectors and then used the revolve tool to create the mesh.

A square zero height relief was quickly created. Then I selected this relief and the mesh to activate the combine tool. The other oddly shaped zero height relief was also created at the same time. I would use this relief (merge lowest) to clip the ends of the hot dog shaped relief to a square shape.

I then selected this new relief and merged highest with the lightbulb and the hot dog shape.

Once I had one relief I used the zero height odd shaped relief to clip the ends of the horizontal axle.

 I then created a round (flat topped) relief which would form the horizontal motor. This too would be merged highest with the rest of the relief.

Since the horizontal motor would have some square tubing inserted down the middle I created a zero height relief for that and modified the base relief by merging lowest with that square shape.

 The very complex shape was then finished. Now it was simply a matter of using the slice tool to create layers which would be routed singly and then glued back together after they were cut.

 

I duplicated and flipped one set so I had both halves of the funnel shaped base. I then aligned all of the pieces to the bottom of the plate and then nested them to fit tightly together. It was time for the MultiCam to do it’s job whittling them all out of a 2″ thick piece of 30 lb Precision Board.
Once the router finished cutting the pieces I started the assembly process. I first used our tables to cut channels into the back to accept the welded steel frame. I could have built jigs and allowed our router to do this task but it was quicker to just do this process by hand. The steel frame was laminated into the middle of the assembly.
I sourced some adjustable feet for the display. They are slightly smaller versions of the feet on our MultiCam – just one small detail to make this thing feel authentic. Our supplier was able to deliver in only a day!
Jack, our welder had been busy cutting steel and welding up a sturdy frame while I designed the cutting files for the inner plywood skin.
As always I fit the pieces at every stage to make sure it is all looking and working correct.
Next we’ll begin working on all of the bottom pieces of the base before we work our way to the top. The MultiCam Robot Man is also proceeding. I’ll be posting the progress on him soon. Stay tuned…

Published with permission from precisionboard.blogspot.com. Source.

Lectern – Part two

Building rather complex objectss is something I enjoy immensely. As I designed I knew from experience just how I would accomplish building the files in EnRoute, how I would machine them with our MultiCa, and how they would then be assembled and finished. Because Precision Board has certain limitations as far as structural strength I knew just how we would weld up a steel frame to go inside. Because the lectern would have to travel many, many thousands of miles and stand up to use in many trade shows we had to get it right from the start.
As I started building the files I first decided in my mind how many pieces we would build and how these pieces would be layered. I first had to decide scale.


The riveted front motor housing was the first piece to be made it a relief. This was fairly straight forward. The file was built entirely in EnRoute.  The inside and outside circle determined the dimensions of raised layer or outer ring. The intersecting lines would be the counterpoints for the rivets.

I then typed in an ‘M’ and sized and positioned it in the center circle. I didn’t get a screen capture but I used the jigsaw tool to get the shapes I needed around the ‘M’.


Creating a flat relief was the first order of business.

 Then I used the center shapes around the ‘M’ to drop the center.

As a last step I created the rivets by modifying the relief using the dome tool.


The table support bracket was next and again it was fairly simple. I defined the shapes using the vector drawing tools.  The rectangle at the bottom was used to segment off the bottom piece. I defined this area using the jigsaw tool.

Then I used the offset drawing tool to create the outline of dropped center portion of the bracket.





At this point I changed my mind and decided that the top (big) flat side of the bracket needed to be as deep as the round collar at the bottom. To do this I created a rectangle of appropriate size. I positioned the rectangle vector and used the jigsaw tool to again define the dropped portion (not shown.)


The round hole through the bracket was created by making a zero height relief. This zero height relief would be merged lowest as a last step to create the hole.


I then made one more outline to make a zero height relief. All of the pieces would be merged (highest) to this relief

The two table top brackets would each have three layers with the center layer  being cut out to accept the steel support. 



With the first two reliefs needed for the lectern created it was time to fire up the MultiCam. The pieces were routed from 1.5″ thick 30 lb Precision Board.

Published with permission from precisionboard.blogspot.com. Source.

Lectern – Part one

Building rather complex objectss is something I enjoy immensely. As I designed I knew from experience just how I would accomplish building the files in EnRoute, how I would machine them with our MultiCa, and how they would then be assembled and finished. Because Precision Board has certain limitations as far as structural strength I knew just how we would weld up a steel frame to go inside. Because the lectern would have to travel many, many thousands of miles and stand up to use in many trade shows we had to get it right from the start.
As I started building the files I first decided in my mind how many pieces we would build and how these pieces would be layered. I first had to decide scale.

The riveted front motor housing was the first piece to be made it a relief. This was fairly straight forward. The file was built entirely in EnRoute.  The inside and outside circle determined the dimensions of raised layer or outer ring. The intersecting lines would be the counterpoints for the rivets.

I then typed in an ‘M’ and sized and positioned it in the center circle. I didn’t get a screen capture but I used the jigsaw tool to get the shapes I needed around the ‘M’.

Creating a flat relief was the first order of business.

 Then I used the center shapes around the ‘M’ to drop the center.

As a last step I created the rivets by modifying the relief using the dome tool.

The table support bracket was next and again it was fairly simple. I defined the shapes using the vector drawing tools.  The rectangle at the bottom was used to segment off the bottom piece. I defined this area using the jigsaw tool.

Then I used the offset drawing tool to create the outline of dropped center portion of the bracket.

At this point I changed my mind and decided that the top (big) flat side of the bracket needed to be as deep as the round collar at the bottom. To do this I created a rectangle of appropriate size. I positioned the rectangle vector and used the jigsaw tool to again define the dropped portion (not shown.)

The round hole through the bracket was created by making a zero height relief. This zero height relief would be merged lowest as a last step to create the hole.

I then made one more outline to make a zero height relief. All of the pieces would be merged (highest) to this relief

The two table top brackets would each have three layers with the center layer  being cut out to accept the steel support. 

With the first two reliefs needed for the lectern created it was time to fire up the MultiCam. The pieces were routed from 1.5″ thick 30 lb Precision Board.

Published with permission from precisionboard.blogspot.com. Source.