Form saw pillar molds? Help finding alternative solution...

[Återfall]

I have made 14 plinth molds in 18mm construction plywood with dimensions of 200x200mm. They also have a small point at the front, cut at an angle to follow the construction of the house that will be on the plinths.

Now I'm wondering if there is a smart alternative to custom-cutting each plinth mold before casting. They will be placed on a rock, and it is very uneven and slopes a lot in some places.

Custom-cutting will be quite tricky to manage, it feels like, but what are the alternatives?

//Anders

 

[corre]

On larger molds, I have seen that foam sealant is used to seal off. Alternatively, backfill with sand/gravel at the bottom, depending on the consistency. You might be able to mix a fairly thick batch of mortar and handplace it against the gaps in the mold, and finish pouring the next day.

To transfer the contour of the rock onto the plywood sheet more easily, you can use a compass with a pencil in it.
http://www.clasohlson.com/se/Passare-Maped/31-4138

You temporarily mount the mold and move the compass horizontally along the sheet with the pencil tip against the sheet and the metal tip against the rock.
https://youtu.be/VvZpp6ftPj8?t=43

 

[myrstack]

Place each respective pier in a proper "blaffa" of concrete during placement? Assuming you have adjustable post shoes or set them afterward. On significantly uneven ground that also happens to be rock, I think it's preferable to use casting tubes, and if you want to drill reinforcement into the rock anyway, you can do everything in one casting after you've secured the reinforcement.