JoeWoodworker
JoeWoodworker Veneer
The Official Website of this Non-Professional Woodworker ™

Part 1
Introduction

Welcome
Veneering Basics

14 Good Reasons
Vacuum Press Uses
Vacuum Press Options
Overview

Questions & Answers
____________________
Part 2a (Option 1 of 2)
Project: V2 Venturi Press

About Project: V2
Parts List
Build the Manifold
Build the Reservoirs
Assemble the Venturi
Make the Carrier
Wire the Press
Testing and Adjusting
Mods and Options
____________________
Part 2b (Option 2 of 2)
Project: EVS Pump Press

About Project: EVS
Parts List
Pump Selection
Build the Manifold
Build the Sub-Manifold
Build the Reservoirs
Make the Carrier
Final Assembly
Wire the Press
Testing and Adjusting
Mods and Options
____________________
Part 3
Vacuum Bagging

Vacuum Bag Basics
Polyurethane vs. Vinyl
DIY Vacuum Bags (A)
DIY Vacuum Bags (B)
Connect the Bag
Bag Closures
Platens/Cauls
Breather Mesh
Maintenance
DIY Frame Press

____________________
Part 4
Veneer Information

About Veneer
Veneering Myths
Backer Veneer

Veneer Glues
Veneering Tips
Substrate Materials
Flattening Veneers
A Sharp Veneer Saw
Jointing Veneers
Taping Veneers
Dealing with Defects
Curing Glued Panels
Veneering w/o Vacuum
Hammer Veneering
Iron-On Veneering
Veneer Storage
Amazing Bookmatches
Copper Veneer Guide
Paperbacked Veneer

Edgebanding Guide
____________________

Part 5
Miscellaneous Info

Vacuum Forming
Vacuum Chucking
Vacuum Clamping
Vacuum Clamp Matrix
Vacuum Infusing
DIY Vacuum Manifold
Vacuum Press Gallery 1
Vacuum Press Gallery 2

Veneer Quality
Veneering FAQ
Veneer Glue FAQ
The Vac FAQ
Copper Veneer FAQ
Downloads (PDF's)

VeneerSupplies.com

Information
Type: Adjustable Auto-Cycling
Vacuum: Air Powered Venturi
Page: 1 of 9
Venturi System

Project V2Project: V2 - Venturi Based Model

In the 18th century, Giovanni Battista Venturi discovered that when compressed air is forced through a restrictive nozzle, its velocity increases and the air is compressed. When the air exits the nozzle, it expands and creates vacuum. This amazing concept can be used to generate vacuum efficiently and economically on a vacuum press.

Venturi Diagram

This version of the vacuum press requires a minimum 5 gallon air compressor.
Click here for compressor requirement details.

Venturi Based Vacuum PressHere's what makes the Project: V2 system a great alternative to ordinary air-powered vacuum presses.

  • Speed: The Project: V2 system will pull a full vacuum up to three times faster than the previous version of the venturi system which will allow it to be used with bags as large as 4' x 8'.
  • Strength: This system is designed around a very powerful venturi which is capable of creating up to 27.5" of Hg.
  • Pressure Storage: With an affordable ball valve and integrated barbed fitting, the system can be pre-charged with vacuum to increase the initial pull down speed.
  • Quality: The Project: V2 system uses nearly all brass components.
  • Non-Proprietary Parts: All of the parts can be readily found on the Internet or at your local hardware store.
  • Efficiency: This system requires less than half of the CFM of pressurized air compared to the previous model. This means even smaller compressors can pull down average size vacuum bags.
  • Simplicity: The entire system can be built in 2 to 3 hours and has only one moving part.
  • Weight: The completed system weighs only 11 lbs and can easily be carried from one location to another.
  • Noise: The Vac Pro venturi has one other very welcomed improvement... an integrated silencer!
  • Price: All of this without a significant price increase in the base construction cost. The entire press can be built for less than $200.

How does the venturi work?
What, you've never heard of the Bernoulli principle? In the mid 1700's, Daniel Bernoulli developed a theorem which shows that a transducer inside a hollowed chamber produces a vacuum by forcing compressed air through a limiting orifice into a channel. As the air exits the orifice it expands, increasing in velocity to supersonic speeds before entering the channel section. This creates a vacuum or negative pressure at the vacuum inlet port located between the orifice and channel section.

Mr. Bernoulli based his discovery on the work of Giovanni Battista Venturi, an Italian physicist who created a device for speeding the flow of the fluid, by constricting it in a cone-shaped tube.

How does the Project: V2 system work?
Think of it this way... the Mac valve is a gate that controls the flow of air from the air compressor only when the vacuum controller recognizes the need for additional vacuum. The venturi pulls vacuum very quickly. In fact the reservoirs tanks will achieve full vacuum in just 20 seconds. After that, the compressed air is shut off automatically.

 

Daniel Bernoulli
Daniel Bernoulli

Giovanni Venturi
Giovanni Battista Venturi

Yes, Joe is a practicing Catholic
The Vac FAQ