Sunday, July 29, 2012

R2-D2: Frame Test Fit

Yesterday I dove in to my build. I did an almost complete test fit. The only thing I didn't fit was the skins and ribs on the skirt. Everything else is together. Below I'll give a step by step as I worked out how to put the frame and skirt together. I'll also point out a few things that took some trial and error to figure out. 

Getting Started
punching out parts from the sprue and cleaning off the tabs and flash that was left over on the parts. I used a had full of tools that made my work easier and quicker than it would have been otherwise.

The most obvious is blue painters tape. this stuff is great at holding without being super sticky and keeps you from having to do major clean up before painting your parts. I have enough tape on the frame right now that It's distracting when you look at the photos, but necessary to hold everything together with my cats roaming around the house trying to use my frame as a kitty castle. I'll see If I can't catch one of them in it and plug in a picture later. 

the other two tools I used are a pair of Testors sprue cutters, Perfect for removing the tabs and stray fibers from the parts without cutting in to the part, or having to sand down the leftovers. Nice smooth cuts. The last tool is a set of Testors needle files. great for smoothing out any rough spots and removing any leftovers and fibers in the grooves and holes of the parts. especially out of the holes. Both of these can be picked up at any store where they have a decent selection of model supplies. I found mine at Hobby Lobby.

Below are a few shots of how well the flash and tabs are cleaned off with these tools, and minimal work. this could have took hours with a hobby knife. I cut huge amounts of time and cleaned up all the parts without any of the gouges that can happen when using a hobby knife.





 As I started punching out and cleaning up parts I pulled parts in sets. One I got the parts for the shoulder hubs cleaned up I started putting them together. Defeating my purpose of getting all parts punched out and cleaned up before I started building.

Here are the Shoulder hub parts cleaned up. 

Attaching the two sides and the 4 cross supports. Everything in is tabbed and grooved so it fits together nice and snug. The tape is required to hold it together until I get it glued up.  
as this is a dry fitting there will be a lot of tape to come.

The frame before the hub plates are attached.


A few shots of the completed shoulder hub.






Back to cutting off tab and flash from parts. Frank marked the sprue of each ring with the ring number and marked the top and front of ring 1 as it has a top/bottom front/back orientation it's important to keep the orientation of ring 1 correct. I thought it important to mark each frame ring with it's perspective number before removing them from the sprue to keep me from being confused and wasting time trying to figure out what ring is 2 and which is ring 4. I used a piece of tape and marked each with a sharpie.
Frame parts all cleaned up and ready for fitting together.


As I started looking at the ribs and trying to figure out which was which and where each rib was to go on the rings, I found I was confused for a bit.  It took some time to figure but I finally figured it out. As there are 16 ribs, and 7 different styles. Using the lettering system that Frank used. I labeled each rib. Starting from the right side of my picture they are labeled; A, A-Left, C, C-Left, D, E, and G.

 Note: that ribs A-Left and C-Left have one extra cut in them.





Assembly

Now that everything is punched out and cleaned up It's time to start getting this test fit on the move. Following Franks instructions from his website r2d2.media-conversions.net I began to fit parts together. 

Insert the tabs on the top of the Shoulder hubs into ring 4. This should be the single tab side. I found that I had to use one of my files to file down the slots just a little in order to fit the tabs in the slots.  filing just a little at a time.



Once ring 4 is on I taped it to the shoulder hub assembly and installed the larger portion of ring 3. again I had to use one of my files to widen the gap a touch so that the tab would fit in the slot. Once on I taped it down.

Setting this piece aside and picking up ring 1 I began to work the rest of the frame.  

Picking up ring one I verified top/bottom and front and rear orientation. This is very important as the ring isn't a perfect circle. 
I snagged this photo from Franks website and edited it as I forgot to take a photo of the ring before adding parts to it.


Here is where I ran in to some issues. Trying to figure out exactly where each of the ribs belong. franks instruction isn't clear here for attaching ring 1 and 2 using the 4 "Rib's D" (stubby ribs)  As I placed them in the wrong positions at first but when I went to install ring 2 on top I couldn't get the slots to line up when the orientation pits on rings 1 and 2 were aligned. After some trial and error It finally hit me that it's basically the corner positions creating an X adding stability to the ring.  the arrows on the diagram below designate the locations of the 4 "Ribs D"

Also watch your up and down orientation on these ribs as well as I didn't discover until I was trying to attach the upper portion of the frame to this section that the tabs on one end are longer than the other. furthermore the longer slots through both ring 1 and 0. 

In the photo below you can see that I have the ribs upside down as the longer tab is sticking out of ring 2 not ring 1.

Next Add Ribs A, A-Left, C, C-Left to the front of ring 1 & 2. After a moment of thought, I started by inserting A and A-Left in the center to slots of the rings. Then added Ribs C and C-Left on the outsides. Left and right should be self explanatory... Left and Right.






Add in the rest of the ribs E and G. Shorter (Rib E) on the sides and longer (Rib G) in the back. 
Install 2 structures together make sure to align up the slots as you insert the 2 pieces. then add the 2 ring sections together.


I really went the hard way about doing this as I installed Ribs G into the rings on to Shoulder rings then attempted to connect the 2 structures together. It took me a bit to get the 2 together. then I added Ribs E. afterwards. This is when I discovered that 3 out of 4 of the D Rib's were installed upside down. I basically had to pull half the ribs out to get this all corrected. I still wasn't sure why so much of the ribs stood out on the bottom side, and was thinking I was not going to like having to sand down those tabs. This is exactly why it's always a good idea to do a dry fit before gluing things together. Here are some more photos.






 Frame with the 2 large structures joined together. But with the issues I have already pointed out.
Notice the picture on the right that there are no tabs sticking up about the short (D) ribs.


Another photo, from the side, showing my D Ribs upside down.

finally the ribs orientation are correct and the frame is back together.
 


Now comes the rest of the 3rd ring.
Slips right in. 



 this is the only part of Ring 3 I'm not sure where it goes yet so I just taped it to ring 1 so I wouldn't lose it. I'll figure it out later.

Adding the Ankle Plate.
Easy tabbed fitting. Insert the slice in to the slot on the plate.
Insert the plate into the groove of ring 2 and the 2 grooves of ring 1.






Test Fit of Frame Complete
Well Almost




TO BE CONTINUED...
















Monday, July 23, 2012

R2-D2: It Has Begun

Received my CNC machined Frame and skirt parts today.

I was ecstatic to see the box on my desk when I arrived home today. But I'm not sure who was more excited When I got the top open, Me or my daughters kitten, Zelda.





 This is the best packing job I have ever seen. Thanks Frank for taking the time to pack everything in perfectly so that there was no damage.
Unfortunately, I didn't have the time to do anything more than unpack everything and take a look at everything.





Absolutely giddy with excitement about getting started building.