LumberJocks

How long in vacuum press?

  • Advertise with us

« back to Joinery forum

Forum topic by mark4345 posted 07-12-2015 12:25 AM 1644 views 0 times favorited 5 replies Add to Favorites Watch
View mark4345's profile

mark4345

66 posts in 1891 days


07-12-2015 12:25 AM

How long do you typically leave the vacuum press going? Usual clamp time 30 mins to an hour?


5 replies so far

View AlaskaGuy's profile

AlaskaGuy

2406 posts in 1777 days


#1 posted 07-12-2015 01:13 AM

I don’t know a lot about vacuum pressing. But I’m betting those that do will want to know,

What glue are you using?
What materials are you gluing?

Stuff like that.

-- Alaskan's for Global warming!

View mark4345's profile

mark4345

66 posts in 1891 days


#2 posted 07-12-2015 01:28 AM

Good point. Titebond 3, i am gluing a 1/8th inch piece of mahogany to timberstrand.
I’m building a front door and using the timberstrand as the core

View AlaskaGuy's profile

AlaskaGuy

2406 posts in 1777 days


#3 posted 07-12-2015 03:35 AM

The web site says yellow glue is not the best for veneering.

http://www.joewoodworker.com/veneering/glues.htm

Found this on another web site.

Glue Type Drying Time

Yellow Glues 1 to 4 Hours Small pieces (braces on the inside of a guitar can dry in as little as 20 to 30 minutes. 4’ x 8’ panels can take as long as 3-4 hours.

White Glues 2 to 6 Hours Gives more open time than yellow glues.

Urea Glues 4 to 6 Hours Urea glues need to be at 70º or higher for proper curing and the piece
should set over night before machining

Polyurethane 1 to 6 Hours Depends on manufacturer and conditions

Epoxies 5 min to 24 Hours Epoxies are two part systems where a catalyst is added to cause it to harden. Most allow you to control the set time by the amount of hardener that is added.

1/8 thick veneer is border line of being to thick from some points of view.

I thinking you need to do some more research before proceeding. Again I’m not a expert but just giving an opinion from some of the stuff I read about veneering.

A good place to start is http://www.joewoodworker.com/

-- Alaskan's for Global warming!

View Fred Hargis's profile

Fred Hargis

3951 posts in 1961 days


#4 posted 07-12-2015 11:45 AM

I always use an urea-formaldehyde glue, and leave it in overnight. If I ever do use PVA, I’d probably go with something along the lines of what AlaskaGuy suggested. Whatever you do, you don’t want to rush it, you can screw it up taking it out too early, but it won’t hurt to spend a little extra time in the bag…..I really think 1/2 hour is rushing it.

-- Our village hasn't lost it's idiot, he was elected to congress.

View bonesbr549's profile

bonesbr549

1176 posts in 2535 days


#5 posted 07-12-2015 01:57 PM



I always use an urea-formaldehyde glue, and leave it in overnight. If I ever do use PVA, I d probably go with something along the lines of what AlaskaGuy suggested. Whatever you do, you don t want to rush it, you can screw it up taking it out too early, but it won t hurt to spend a little extra time in the bag…..I really think 1/2 hour is rushing it.

- Fred Hargis

+1. What he said. If you remove early you can get a bubble.

-- Sooner or later Liberals run out of other people's money.

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com