Paddleducks

General => Chat & Off Topic Stuff => Topic started by: DamienG on June 30, 2015, 09:29:06 PM

Title: Bent ply
Post by: DamienG on June 30, 2015, 09:29:06 PM

Any tips for straightening a 120mm x 300mm x 6mm ply board if laid flat at 3/4 length it is 12mm off the bench.
My first thoughts were wet it a put a weight at the bend site.
Any ideas most welcome.
Damien.

Title: Re: Bent ply
Post by: derekwarner_decoy on June 30, 2015, 10:28:53 PM

Evening Damien.......6mm thick :whistle.....what is the layer construction matrix.....3 x 2.....4 x 1.5?

Is it marine ply, internal grade ply, formwork construction grade ply??

Each has a different bonding glue used during manufacture, and hence each will react differently :hammer  to water, steam or a bending force

Has the ply swollen in thickness at the bend radius point?

Derek

Title: Re: Bent ply
Post by: DamienG on July 01, 2015, 12:56:34 PM

Derek,
It's 3ply Bass wood bought from Balsa Central,South Au.
It remains within 6.09mm and 6.14mm for the entire length, no idea what category the ply conforms to though possibly Hobby grade.
I've emailed them with the same question, so far without reply.

Damien

Title: Re: Bent ply
Post by: DamienG on July 01, 2015, 09:41:28 PM

Problem solved I washed both sides of the affected section with HOT water placed 3 coffee stirrers end to end and put ply bend up on them and placed a 5kg block of steel on the raised area 10 hours later all straight.