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help choosing a vacuum for a table press
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wdwyeriii



Joined: 14 Dec 2015
Posts: 9

PostPosted: Sat Jul 15, 2017 10:57 pm    Post subject: help choosing a vacuum for a table press Reply with quote

I built a table for the vacuum press and now my little vacuum does not have the power to suck out all the bubbles on the skis.

Does anyone know a spot in Europe where I can buy a vacuum that is strong enough to pull silicone on a large table vacuum press?

I live in Norway, so the closer the better. Thanks for the input!
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backyardskier



Joined: 05 Nov 2011
Posts: 138

PostPosted: Tue Jul 18, 2017 5:37 am    Post subject: Reply with quote

Not in Europe but they ship there.
http://www.veneersupplies.com/categories/Vacuum__Press__Items/Vacuum__Press__Parts/
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Gilo



Joined: 03 Feb 2013
Posts: 53
Location: Somerset - the flatlands

PostPosted: Tue Jul 18, 2017 8:06 am    Post subject: Reply with quote

http://www.easycomposites.co.uk/vacuum-equipment-and-supplies/vacuum-pumps-and-equipment

https://www.ecfibreglasssupplies.co.uk/category/vacuum-equipment

http://www.airpress.co.uk/87-bvacuum-pumps-onlyb/
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wdwyeriii



Joined: 14 Dec 2015
Posts: 9

PostPosted: Wed Jul 19, 2017 11:36 am    Post subject: Reply with quote

Thanks for the links. I will take a look at them. I am thinking that my vacuum does not get enough pull, as I keep getting bubbles and warping in my p-tex. I have a silicone blanket on a table press.

If there is one that you recommend, that would be great, but if not I will play around and give it a go.

Thanks for the links,
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pmg



Joined: 01 Dec 2012
Posts: 433
Location: Sonthofen

PostPosted: Thu Jul 20, 2017 7:34 am    Post subject: Reply with quote

Hi, post some photos of your setup and your results, that will help us help you :)
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burnside



Joined: 05 Aug 2016
Posts: 15
Location: Brooklyn, NY

PostPosted: Thu Jul 20, 2017 9:37 am    Post subject: Reply with quote

Where is the silicone blanket in your set-up? Could the heat from that be causing the warp in your base?

pmg is right, pictures would help
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MontuckyMadman



Joined: 20 Jun 2008
Posts: 2342

PostPosted: Thu Jul 20, 2017 7:27 pm    Post subject: Reply with quote

The real questio. Is where is the thermocouple in relation to the heating blanket.
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chrismp



Joined: 13 Feb 2009
Posts: 1241
Location: Vienna, Austria

PostPosted: Fri Jul 21, 2017 1:26 am    Post subject: Reply with quote

Montucky is probably right. The bubbling could well be caused by overheating the materials in the press.
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wdwyeriii



Joined: 14 Dec 2015
Posts: 9

PostPosted: Thu Jul 27, 2017 11:48 am    Post subject: thanks for the help Reply with quote

Thanks for the help. I have a heating blanket that covers the whole ski placed on top of the silicone.

I have some photos, but I am on vacation now in the states. Your help would be most appreciated. I will post some photos here when I get back. I am thinking that either my frame is too small, or the vacuum not strong enough.

The problem looks a lot like waves in the ski p-tex and the veneer on top. I have had this issue a couple times, but thought the new press would help.

photos will come soon, thanks for your help
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24Dave



Joined: 03 Oct 2011
Posts: 88

PostPosted: Tue Aug 08, 2017 12:24 pm    Post subject: Reply with quote

I would try a stronger vacuum pump. I have had waves under a veneer layer before from a vacuum hose line that partially melted shut and also probably from not scraping the resin off the laminate fiber thoroughly enough in lay-up.
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wdwyeriii



Joined: 14 Dec 2015
Posts: 9

PostPosted: Sat Aug 12, 2017 1:42 am    Post subject: Photos of my issue Reply with quote

Thanks for your help here. Here are some of the photos of what I have been working with. I am still new to the process.

The first is the press; I put my heat blanket on top of the set up, but you can see that the vacuum is not pulling the silicone all the way down.

The second and third photo are the bubbles that have occurred in the veneer and the layup.

I am posting some links to photos on here, I was trying to figure out how to get them on the message, but it is my first time posting a photo on here, so let me know if you don't see them.

Again, any help would be great.

https://drive.google.com/file/d/0B9qNrYN66NDBWU04T0EwUGs5UUU/view?usp=sharing

https://drive.google.com/file/d/0B9qNrYN66NDBSFRudGVEM0UtRE0/view?usp=sharing

https://drive.google.com/file/d/0B9qNrYN66NDBd2Qza0xMUTQtYmc/view?usp=sharing
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chrismp



Joined: 13 Feb 2009
Posts: 1241
Location: Vienna, Austria

PostPosted: Sun Aug 13, 2017 8:21 am    Post subject: Reply with quote

Is your hole press MDF? If so, that is probably a big part of your problem. Untreated MDF is really porous and lets a lot of air pass through. You need to seal the MDF or build the press out of a material that's airtight.
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wdwyeriii



Joined: 14 Dec 2015
Posts: 9

PostPosted: Sun Aug 13, 2017 9:42 pm    Post subject: Reply with quote

Just the frame is untreated MDF. The table I covered with Epoxy to seal already, but you are right that I should seal the frame as well. I will coat the MDF frame with epoxy and see if that gives me a bit more power.
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burnside



Joined: 05 Aug 2016
Posts: 15
Location: Brooklyn, NY

PostPosted: Tue Aug 15, 2017 12:03 pm    Post subject: Reply with quote

In addition to sealing the frame, you could try pre-forming the silicone by hitting it with a heat gun at the tips and stretching it by hand. I think Sammer did something along these lines with his vacuum press
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chrismp



Joined: 13 Feb 2009
Posts: 1241
Location: Vienna, Austria

PostPosted: Tue Aug 15, 2017 11:46 pm    Post subject: Reply with quote

I think sammer has a PU vacuum membrane, not silicone. Silicone should be stretchy enough as is to conform to the mold.
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