Mcunn
(Michael Cunningham)
August 7, 2022, 8:26pm
1
So it’s raft race time again and the lowrider is busy cutting away… it’s fun to watch the machine fly through foam at 50mm/s at 30mm depth of cut
This year we are doing a 1 sheet build out of a lightly used piece of foam board.
His opinion… … isn’t there something better than all these dumb holders (tabs).
13 Likes
vicious1
(Ryan)
August 8, 2022, 2:00am
2
Oh that is looking interesting already. Can’t wait!
Mcunn
(Michael Cunningham)
August 8, 2022, 7:19pm
3
Was trying to figure out why lr was struggling to cut the last few parts…
3 Likes
orob
August 8, 2022, 9:25pm
4
Turn down the router speed to as low as possible? I have had a few cuts like that with foam.
1 Like
Mcunn
(Michael Cunningham)
August 9, 2022, 12:31am
5
Yup that’s all the way down. It’s weird it made 90% without hooping up I guess it’s a cumulative thing. No big deal it was an old bit.
Mcunn
(Michael Cunningham)
August 9, 2022, 12:33am
6
Just had fun with a can of spray foam
8 Likes
Mcunn
(Michael Cunningham)
August 9, 2022, 1:40am
8
Yep sanding is going to be … unfun
azab2c
(Aza B2C)
August 9, 2022, 1:52am
9
Could Hot Wire Foam Cutter be used, would that be easier than sanding? Or just go at it with a serrated bread knife, usually used for cutting insulation batts, e.g. “Grip-Rite Stone Wool Insulation Knife”
Looks like a cool sturdy project. Makes me wonder if 'm just a few foam boards and spray foam cans away from that yacht I’ve always wanted.
Not sure if a hot wire will cut expanding foam.
1 Like
jeffeb3
(Jeffeb3)
August 9, 2022, 2:14am
11
I would start with a hack saw.
1 Like
Or that electric carving knife you got as a wedding gift that never gets used.
5 Likes
I am kinda old. Coping saw may work great
Mcunn
(Michael Cunningham)
August 9, 2022, 2:51am
14
I did an initial pass with an angle grinder with a flapper wheel will follow up with some 60 grit sandpaper.
Thanks Barry for the heads up about the hot knife and spray foam.
Spending far too much time on this but if it comes out good it may have a life beyond this one race.
3 Likes
orob
August 9, 2022, 4:16am
15
old bit: you can heat gun it and get the purple plug to fall off and keep going…
2 Likes
Acetone does wonders on this kind of foams, it eats it up righ away.
6 Likes
I’ve used foam acetone slurry to build out props for theater class. Build out armor in cardboard then paint it with the slurry. The acetone flashes off and you’re left with a fairly durable part. Little sanding and paint and it looks great on stage, and might last through more than one production.
5 Likes
kockie-nl
(Kockie_nl)
August 9, 2022, 6:42pm
18
I’ve used foam acetone slurry to build out props
i took a note for future use! (Shrek will be our next musical, so lots to build)
1 Like
Do it outside or a well ventalated space with fans blowing outside. Lots of fumes until the acetone evaporates.
Mcunn
(Michael Cunningham)
August 12, 2022, 3:57am
20
First time trying pmf (poor man’s fiberglass)
Basically paint a layer of glue and lay a cloth tarp on the wet glue. Then multiple layers of paint over the cloth.
Not super impressed compared to real fiberglass cloth but I think it will work ok.
5 Likes