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Old Feb 28, 2012, 11:47 AM
Registered User
Spain
Joined Jan 2010
457 Posts
Help!
Need expert help to get bottom flat with vacuum forming

Hello,
Im making the body of a toy in ABS plastic (1 mm thick) and thought Im getting what i consider not too bad results
http://www.rcgroups.com/forums/showt...2#post20884043
, Im also finding very difficult to get flat bottom in the piece (I mean vertical sides respect to the horizontal table without 1-2 mm curve surface in the bottom) when doing the vaccum forming.
The best approach Ive got its today using a tool to adjust the shape while the piece was still hot using a heatgun to help too.
http://www.rcgroups.com/forums/showp...3&postcount=22
Any idea how can improve this ..maybe modifying the hole system on the table?
Maybe getting the piece a bit up to get more space down to cut..but if so...any tip to cut it full straigh?
Thanks in advance, saludos,
Jose
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Old Feb 28, 2012, 12:04 PM
Just fly it!
wyowindworks's Avatar
Cody, WY
Joined Nov 2007
6,915 Posts
Just shim your buck off the table a few mm. This will let the holes under the buck suck the plastic in the corner.
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Old Feb 28, 2012, 12:11 PM
Registered User
Spain
Joined Jan 2010
457 Posts
hmmm

Quote:
Originally Posted by wyowindworks View Post
Just shim your buck off the table a few mm. This will let the holes under the buck suck the plastic in the corner.
Got this info searching in forums, to put under the piece:
"window screen and it's woven"
will this do the trick?

Saludos,
Jose
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Old Feb 28, 2012, 12:15 PM
Dean
A10FLYR's Avatar
USA, CO, Littleton
Joined Apr 2005
3,841 Posts
More heat...more vacume....or as you say...raise the plug up a little...can you make little scratches on the bottom of the plug for air to escape?

edit...Looks like you beat me to it.......
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Old Feb 28, 2012, 12:22 PM
Just fly it!
wyowindworks's Avatar
Cody, WY
Joined Nov 2007
6,915 Posts
Quote:
Originally Posted by Doblao View Post
Got this info searching in forums, to put under the piece:
"window screen and it's woven"
will this do the trick?

Saludos,
Jose
You can just use some little 1/32" ply squares. You want them to be just inside from the edge. You obviously don't want anything sticking out.
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Old Feb 28, 2012, 01:47 PM
Registered User
Spain
Joined Jan 2010
457 Posts
hmmm

Quote:
Originally Posted by wyowindworks View Post
You can just use some little 1/32" ply squares. You want them to be just inside from the edge. You obviously don't want anything sticking out.
as unfortunately english is not my mother language and google doent give me any hint when searching for images of this...can u please post me a link to the ply squares u listed before?
Thanks,
Jose
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Old Mar 03, 2012, 09:10 AM
Firecracker!
BillO's Avatar
San Francisco & Santa Cruz
Joined Oct 2004
2,352 Posts
"Ply" is short for "plywood", which is thin sheets of wood glued together. You could also use balsa wood, or bass wood, or anything else that is 1/32" thick. Cardboard, plastic, etc.
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