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Reply to "Continuing Saga …"

Didn't work on TG, but did today. After looking more closely at my own design, I realized that the turret roof transitions to the turret walls with a curve and another layer of roof structure.

Screen Shot 2020-11-27 at 6.18.47 PM

I added another piece of MDF sized for the turret wall top, drilled the same clearance hole in the middle and laminated it to the existing turret roof. I then started to produce the fillet. The first step was filling it with Bondic. Since Bondic cures in seconds with the UV light it's a great way to start the filling process. I laid it down in 3 layers since you don't want to get too thick before curing that layer.

HBTRR Turret Roof Bondic Fill

I pre-shaped the Bondic to give the rough curved shaped with a round sanding head on my MicroMark Power Sander. To finish it off I completed the fill with Tamiya Fine Filler. I shaped it reasonably well and will let it fully cure over the weekend and sand it on Monday. If the filler isn't fully hard it doesn't sand right.

HBTRR Turret Roof Final Fill

I tried the new roof onto the turret and it will look good when finished.

HBTRR Turret Roof Transition Fit

Next up was completing the turret double hung windows. Again, I used PSA which is great for glazing since it doesn't run, graze and sticks instantly. I installed these windows using Gel CA.

While this was going on I was attempting to reprint the corbels. For some reason, the file on the black thumb drive must have been corrupted. It attempted to print it twice and abbended both times after about five minutes. Each time that happened I had to scrape off the little bit that DID form, scrape off the pre-coat, clean it up and pre-coat it again.

Finally, I went back to the computer, redid the entire slicing file, and this time saved it to the blue thumb drive and the print was successful. Actually much more successful than when I did the first run months ago. I don't believe I was pre-coating then and had some failures where the corbel pairs separated. One run isn't enough for the building and the second batch just finished. I'll take care of them on Monday. If you see that very thin film attached to some of them, it's the pre-coat. It's only a couple of thousandths thick, maybe even thinner so it doesn't affect the parts sizing.

HBTRR New Corbel Run

Since I couldn't completely finish the turret due to the top roof curing I got back to work on the main roof. My main roof supports are a bit skimpy and when I held the hip roof pieces in place I realized that gluing them to the supports and the roof one at a time wouldn't work. Here is the cross-lapped the support structure glued to the main roof.

HBTRR Main Roof Supports

The problem with this support scheme is no contact area in the important corners. It supports the middle of the roof panels, but the mating edges float all over the place. So this time I did it a bit differently. I gave the lower and mating edges of the roof panels a quick sanding to impart a better junction angle. I then taped the roof sections together with some Tamiya tape. When the panels are butted together and taped tightly, they automatically fall into the correct hip roof angle due to the panels laser cut directly from the SU drawings of the same.

HBTRR Main Roof Fitup

This view was looking at the bottom. I then spritzed the joints with accelerator and then added med CA to the junctions where the tape wasn't. I then removed the tape and finished it up. I then used Gel CA to close the little larger gap at the hip peak. I sanded the corners to remove any irregularties.

With the roof shaped and strong I slathered Aleen's Tacky Glue to the edges and the supports and then glued the roof down with some clamps until it dried.

HBTRR Main Roof Attach

I started glazing the Mansard windows. The laser cut acetate fit perfectly so that all worked out, since we're talking about going from an SU drawing and creating a laser cut drawing file and a 3D print file and having them fit together. Whoopee! Even the little circular top light dropped into place. Again, using PSA to hold them in. I also did some more Mansard balsa repair in prep for shingling.

HBTRR Mansard Glazing

When I was handling the main roof, I was concerned I was putting too much stress on the pair of CL2 LED drivers that are attached on the bottom. After looking closed at the soldered pair I didn't like that the hot leads were touching that dead, cut-off center lead. It would provide a bypass to the LEDs and instantly burn them out. So I attempted to cut the center lead closer to the chip, and of course, cut off one of the power leads. I installed a new CL2, but this time kept them apart and joined the red leads about an inch down the run. Checked it out with power and everything worked.

Have a nice weekend, everyone.

Attachments

Images (9)
  • Screen Shot 2020-11-27 at 6.18.47 PM
  • HBTRR Turret Roof Bondic Fill
  • HBTRR Turret Roof Final Fill
  • HBTRR Turret Roof Transition Fit
  • HBTRR New Corbel Run
  • HBTRR Main Roof Supports
  • HBTRR Main Roof Fitup
  • HBTRR Main Roof Attach
  • HBTRR Mansard Glazing

OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

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