Vacuum gauge goes down after clamping off the bag

Talk Composites - The Forum for Advanced Composites

Back

Home
»
Advanced Composites Forum
»
Resin Infusion
»
Vacuum gauge goes down after clamping off the bag

Vacuum gauge goes down after clamping off the bag

Vacuum gauge goes down after clamping off the bag

Author	Message
S_Carbon_fibre	S S_Carbon_fibre posted 7 Years Ago HOT Topic Details
S Group: Forum Members Posts: 17, Visits: 89	Hello, I recently bought the starter kit for VI. I follow the instructions in the video and I am getting a vacuum pressure of around -27.5 but when I clamp off the bag between the vacuum bag and the vacuum chamber, the vacuum gauge goes immediately up. Why is this happening? In the video it stays where it is. Is there a leak in the vacuum chamber? do you have any tips how to check this? many thanks SH Edited 7 Years Ago by S_Carbon_fibre
	Reply Like 5

GO

Merge into selected topic...

Merge into merge target...

Merge into a specific topic ID...

Threaded View

Threaded View

Vacuum gauge goes down after clamping off the bag

S_Carbon_fibre - 7 Years Ago

There will be a leak somewhere, yes. It is far more likely to be in a hose connection than it is to be in the actual structure of the catch pot itself, so make sure all your hoses and fittings are...

Hanaldo - 7 Years Ago

Hi SH, Hanaldo has posted some good points but just reading through your original post again I'm wondering if the problem is actually something slightly different. The title to your post is 'vacuum....

Matt (Staff) - 7 Years Ago

Hello both, many thanks for the very quick responses. I think what Hanaldo wrote describes better the problem, once I clamp off the bag between the bag and the catch pot the pressure gauge goes up.....

S_Carbon_fibre - 7 Years Ago

Hi, yes, you do. We could write a book on vacuum bagging! The best advice I can give anyone experiencing problems is to be logical and isolate individual areas to find exactly where the problem is.....

Matt (Staff) - 7 Years Ago

Hi Matt, many thanks these hints are very helpful. I will retry by following your advice. Best, SH

S_Carbon_fibre - 7 Years Ago

Hello, I managed to find a leak at the connector of the catch pot, this was causing the gauge to go up after clamping off the bag;it is fixed. Since I had a leak in the bag too I am planning to do.....

S_Carbon_fibre - 7 Years Ago

Boeing actually have a patent on the infusion process using two rows of sealing tape. In theory it does give you better vacuum integrity. In reality, I think it's just a waste. It's perfectly...

Hanaldo - 7 Years Ago

No doubt it is a waste of material but I was just thinking how to increase the possibility of success since I don't have any experience. Is there a way to check and find out where about your bag...

S_Carbon_fibre - 7 Years Ago

The easiest way to do this is a drop test. Clamp the vacuum and the resin feed hose and come back an hour later. If the bag is just as tight as when you left, your seal should be good enough for an.....

oekmont - 7 Years Ago

thanks for these great tips, interesting to hear that this equipment is so helpful, I will do my research and maybe get one. Also,thanks for sharing your thoughts on using double sealant tape, I am.....

S_Carbon_fibre - 7 Years Ago

Similar Topics

Post Quoted Reply

Reading This Topic

Login
Remember Me Reset Password Resend Validation Email Login	Facebook Google

Explore

Messages

Mentions

Search