Controlling PVC Action
8 replies to this topic
Posted 01 January 2009 - 01:18 PM
I've yet to venture into the pvc world but I'm thinking about it. My guess is that the pvc is more predictable from bait to bait. Maybe not, maybe more or less air within the cells from area to area. Most of what I build is out of cedar which is quite buoyant and I weight it accordingly but the action is lively. What can I expect from pvc for action and what type of wood would you compare it to for action?
Posted 01 January 2009 - 02:52 PM
i use pvc exclusively and have had very few problems with it. rarely have i had a piece that had voids in it. i used to use poplar and found that balancing it was sometimes difficult. the bait wanted to list to one side or the other depending on the grain density. i haven't had this problem with pvc, as long as i get the ballast centered in the belly.
i use the pvc that is used for exterior millwork. Lowes sells it in different sizes and shapes. you need to remove the outer skin ( approx. 1/16" ) as it is very hard and will not epoxy well. i usually trim it off on my tablesaw.
also when you get ready to paint use some Krylon plastics paint as a base coat. i generally use white and spray on a few coats and then lightly sand it prior to painting.
here's a pic of how i do the internal hinging. the nice thing about pvc is that i don't have to carve out areas for the wire. i just heat it and melt it into the bait. let it cool for a few mintes 5-6. and then gently lift it out so you don't bend the wire out of shape. practice this process on some scrap to get the hang of it before commiting to an actual bait.
Posted 01 January 2009 - 05:08 PM
Your describtion and picture of internal wiring of your PVC baits is very interestíng , I really like your wire form design and also the idea of melting it into the material:yes: !
Thanks for sharing:yeah: !
But still I wonder , what exactly kind of stuff the term "PVC" refers to ?
I am almost sure , that it it is the same stuff , what in German we generally call "Styrodur" , these are kinda hard foam plates , having quite a low weight but high durability , available with some sorts of outer plating or without , some even with a metal sheet plating .
Guess , that it is used for construction , insulation and coverage for building walls .
Some builders on local sites use this stuff for crankbaits , one guy there advised me to obtain it for free from building sites scrap(haven't tried this yet , I am also ready to buy it from local suppliers, lol:lol:) .
greetz , diemai
Posted 02 January 2009 - 01:33 PM
Diemai, PVC, aka polyvinyl chloride, is used here for the same things you describe: an expanded foam to make durable exterior and interior moldings for houses. If yours is a styrene and not vinyl, it's different stuff but may be functionally similar. Maybe a TU Foam Expert can confirm.
Posted 02 January 2009 - 02:27 PM
This is the stuff , that I was refering to , just googled for it , this is a site of the BASF , a giant German chemical industry plant , English version .
Obviously they have the trademark on the term "Styrodur" , certainly there would be also different manufacturers around .
BASF Group: Plastics - Stryrodur: Benefit & Solutions
There are different densities available(look at "products") , I guess , for luremaking the one with the highest model code number would be neccessary , because it is obviously the hardest !
greetz , diemai
Posted 02 January 2009 - 06:00 PM
you can find PVC plates in germany at www.modulor.de. but keep in mind, that several different types concerning "hardness" and density are sold. the stuff is also well know and often used for architectural sculpturing and prototype carving (hand or cnc) (i.e. mould foam)
as far as it comes to Styrodur: the tiny air incapsulations (bubbles) in the material is what why it is used as isolation. the "holes" have to be filled after carving. also styrodur is by far not as hard as "mould foam" or PU-foam i used for castings.
Posted 02 January 2009 - 06:22 PM
Just checked the English version of that site , so I guess , that it must be the "Forex" sheets , these are called "PVC" there ?
Heck , I am just too unexperienced with all this kinda stuff:o !
And also I'd rather prefer to see and feel the material in a shop rather than ordering for it through the web .
Well , gonna check the German version now........!
Thanks for your advice and that link , anyway;) !
greetz , diemai
Posted 02 January 2009 - 06:45 PM
Ok , I have browsed through it a bit , that stuff weights 0,7 grams per cubic centimetre(2 to 4 mm thickness) , the thicker boards only 0,5 grams per cubic centimetre , which would be half as much as water , so theoratically a lurebody without hardware would stick out of the water with half of its volume !
That is more buoyant like many woods , that I have used !
To glue two PVC sheets together to put a wire form inbetween , I could use that special PVC glue , that they offer on that site as well , I guess ?
Thinking to get sheets of 10 mm , so glued together I'd have 20 mm thickness of lurebody , which would fairly be enough for some tapering and rounding off the blank .
Heck , it's 2 to 2 1/2 hours by car to get to Berlin from my place , way too long just for some material , need to have it mailed !
greetz , diemai
Edited by diemai, 02 January 2009 - 06:54 PM.
Posted 02 January 2009 - 06:47 PM
Sorry , double post !
Edited by diemai, 02 January 2009 - 06:49 PM.