|
carbonfibreworks
|
|
|
Group: Forum Members
Posts: 292,
Visits: 4.5K
|
|
|
|
|
|
wozza
|
|
|
Group: Forum Members
Posts: 688,
Visits: 5.4K
|
 No going back now, the Infusion Bug has bitten.!!!!!!!!!!!!!!! More pleats/bigger bag. That's why you have the dry looking area in the middle of the part.Because the bag is stretched too tight once the resin is introduced the bag relaxes a little. Its ok in one direction(length ways) but too tight across the part. (from the pics) If the gum tape is being "pulled in" rather than just pressed down then the bag is too small or not positioned correctly. |
|
|
|
|
carbonfibreworks
|
|
|
Group: Forum Members
Posts: 292,
Visits: 4.5K
|
wozza (28/04/2013)
No going back now, the Infusion Bug has bitten.!!!!!!!!!!!!!!! More pleats/bigger bag. That's why you have the dry looking area in the middle of the part.Because the bag is stretched too tight once the resin is introduced the bag relaxes a little. Its ok in one direction(length ways) but too tight across the part. (from the pics) If the gum tape is being "pulled in" rather than just pressed down then the bag is too small or not positioned correctly.
Warren
Hi Warren Yes your correct no going back, i worked hard to ensure no bridging took place so quite pleased with the outcome and yes a slightly bigger bag would help. I did not have room for a silicon connector at the vacuum end so i cut the vac spiral in half and pushed them into the vac pipe. Chris
|
|
|
|
|
wozza
|
|
|
Group: Forum Members
Posts: 688,
Visits: 5.4K
|
Ha Ha welcome to the dark side I am averaging 4/5 Infusions a day, 6 days a week at the moment so I have made plenty of mistakes and had plenty of problems to overcome. Having said that I am sure there are still more issues to come.
|
|
|
|
|
fgayford
|
|
|
Group: Forum Members
Posts: 433,
Visits: 1.2K
|
I have come up with a way of not using connectors at all.
I wind the spiral around the last inch of plastic tube and wrap a bit of masking tape around the joint to hold it. I then cut off the length of spiral tube I need to cover the span. I wrap a 3 inch strip of tacky tape around the the plastic tube and then stick it down so the perimeter of the vacuum bag goes right over top of it. The two tacky tapes seal just fine with a bit of pressing. I get perfect seal every time.
Fred
|
|
|
|
|
fgayford
|
|
|
Group: Forum Members
Posts: 433,
Visits: 1.2K
|
You did a nice job there. Remember you can never have a bag too big, but you can have one too small. Pleats will take up any excess and there is no danger of bridging then.
I think I bag different than most people. I learned a trick from John Burns. I lay my bag down on the table flat and then put the tacky tape all the way around the perimeter. I then flip it over and peel back the paper from a corner and stick it down to one corner of the mold. I the do the same with all 4 corners. I now peel off strips of the paper and work my way around the flanges pinching a pleat and then sticking it down and so on all the way around the bag. To put pleats in like most do is such a pain for me that i feel like it requires the skill of a brain surgeon. I can do a bag in minutes this way with confidence. google John Burns vacuum infusion and he does a youtube demo. I will never go back to sticking the tacky tape down first and then fitting the bag, its much too hard this way.
Once again, only my opinon.
Fred
|
|
|
|
|
carbonfibreworks
|
|
|
Group: Forum Members
Posts: 292,
Visits: 4.5K
|
fgayford (29/04/2013)
You did a nice job there. Remember you can never have a bag too big, but you can have one too small. Pleats will take up any excess and there is no danger of bridging then.
I think I bag different than most people. I learned a trick from John Burns. I lay my bag down on the table flat and then put the tacky tape all the way around the perimeter. I then flip it over and peel back the paper from a corner and stick it down to one corner of the mold. I the do the same with all 4 corners. I now peel off strips of the paper and work my way around the flanges pinching a pleat and then sticking it down and so on all the way around the bag. To put pleats in like most do is such a pain for me that i feel like it requires the skill of a brain surgeon. I can do a bag in minutes this way with confidence. google John Burns vacuum infusion and he does a youtube demo. I will never go back to sticking the tacky tape down first and then fitting the bag, its much too hard this way.
Once again, only my opinon.
Fred Hi Fred Yes putting in the pleats was a pain, the size and shape of the mould did not help but the time taken was worth while as i had 100% seal first time. I do remember seeing a John Burns video using the method you described and will try that on one of my next jobs, every day is a school day Chris
|
|
|
|
|
NikCFC
|
|
|
Group: Forum Members
Posts: 61,
Visits: 871
|
I agree with Fred, it's way easier making the bag and the pleats this way!
|
|
|
|
|
alebassa
|
|
|
Group: Forum Members
Posts: 48,
Visits: 171
|
fgayford (29/04/2013)
You did a nice job there. Remember you can never have a bag too big, but you can have one too small. Pleats will take up any excess and there is no danger of bridging then.
I think I bag different than most people. I learned a trick from John Burns. I lay my bag down on the table flat and then put the tacky tape all the way around the perimeter. I then flip it over and peel back the paper from a corner and stick it down to one corner of the mold. I the do the same with all 4 corners. I now peel off strips of the paper and work my way around the flanges pinching a pleat and then sticking it down and so on all the way around the bag. To put pleats in like most do is such a pain for me that i feel like it requires the skill of a brain surgeon. I can do a bag in minutes this way with confidence. google John Burns vacuum infusion and he does a youtube demo. I will never go back to sticking the tacky tape down first and then fitting the bag, its much too hard this way.
Once again, only my opinon.
Fred Thank you, this is really a great idea! It's such a pain to make the pleats, especially if the part is little!!
Alessandro
|
|
|
|
|
prsw
|
|
|
Group: Forum Members
Posts: 112,
Visits: 1K
|
Is that UD I see on the side? Did it infuse good? I did a self-supporting racebike subframe with lots of UD and didn't infuse because it, I have been told, does not wet out if infused. (or rather i did infuse it first and then wetlay/bagged more material later.) Bartonphoenix750 (28/04/2013)
http://motoform.blogspot.se
|
|
|
|