Materials to use for a hollow hemisphere

Discussion in 'Scenery, Props, and Rigging' started by Dennis B, Mar 17, 2019.

  1. Dennis B

    Dennis B Member

    Messages:
    7
    Likes Received:
    8
    Location:
    Dixon, CA
    So, ultimately here is what I did:
    1. Built a dome form (two half-circles of plywood, notched so they would interlock at a 90-degree angle)
    2. Cut an arc from plywood as a bending form
    3. Heated PVC and bent it around the bending form. Once I had a complete circle I placed it on the dome form. Did this four times for 4 different circle diameters.
    4. Laid chicken wire over the circles and wired it in place.
    5. Watered down yellow glue + brown construction paper to papier mache the outer form.
    6. With the second layer, I sprayed expanding foam onto the existing layer first and smeared it out before laying the second layer pieces down (i did this in sections - the foam sets up too quickly otherwise). Once this cured, it make a surprisingly rigid shell!
    7. Build a base and stood the hemisphere on end, on the base, and screwed it down.
    8. Single layer papier mache on the inner surface, also smearing the paper with spray foam before attaching it (so it would bond to the wire).
    Came out great - not a perfectly smooth sphere, but that's kind-of expected with chickenwire.
     
    RonHebbard likes this.
  2. Dennis B

    Dennis B Member

    Messages:
    7
    Likes Received:
    8
    Location:
    Dixon, CA
    XQWD1825[1].JPG
     
    lwinters630 and RonHebbard like this.
  3. Dennis B

    Dennis B Member

    Messages:
    7
    Likes Received:
    8
    Location:
    Dixon, CA
    Here's a photo of the final product. (Sorry, I seem to have forgotten how to embed a photo...)

    EDIT: updated the photo.
     

    Attached Files:

    Last edited: Aug 13, 2019
    RonHebbard likes this.
  4. BillConnerFASTC

    BillConnerFASTC Well-Known Member

    Messages:
    5,531
    Likes Received:
    2,600
    Occupation:
    Theatre Consultant
    Location:
    Clayton NY 13624
    Impressive! Something wrong with photo link though. Maybe did not all upload.
     
  5. SHCP

    SHCP Active Member

    Messages:
    170
    Likes Received:
    92
    Occupation:
    Technical Director
    Location:
    San Francisco
    This is great. Keep this idea around for anyone doing HONK! Making those eggs is always a challenge.
     
    RonHebbard likes this.
  6. BillConnerFASTC

    BillConnerFASTC Well-Known Member

    Messages:
    5,531
    Likes Received:
    2,600
    Occupation:
    Theatre Consultant
    Location:
    Clayton NY 13624
    Very finished piece impressive indeed.
     
    RonHebbard likes this.
  7. JonCarter

    JonCarter Well-Known Member

    Messages:
    394
    Likes Received:
    303
    Occupation:
    Happily retired
    Location:
    Meridian, Idaho, US
    Yes, very nice looking finished product. What was the total cost (time & materials)? What percentage of your set was this? What percentage of your set budget was this?
     
    RonHebbard likes this.

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice