Darryl Keil Last Activity 2024-10-10 3:42 PM
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rem81

Posts: 5

Joined: 2016-02-04

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Subject : Videos of Pumps in Action
Posted : 2016-04-28 1:55 PM
Post #37479
My first post here as I wasn't able to find an answer. I am comparing two pumps for purchase and am interested in knowing if there are any videos of the pumps in action.

I am looking at the 1.5cfm and the 6cfm pump and am trying to best gauge the differences in the two since the cost difference is substantial for me.

Any suggestions? I'm looking to bend something like the attached picture, which I did with clamps and a male/female mold out of 23 layers of veneer (20 aspen, 3 walnut). Radius is 3"

Any advice is much appreciated.
Attached file : bend_1.jpg (48KB - 12 downloads)



 
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Darryl Keil

Posts: 1453

Joined: 2003-05-22
Location: Maine

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Subject : RE: Videos of Pumps in Action
Posted : 2016-04-28 2:30 PM
Post #37480 - In reply to #37479
I am sorry to say that we do not have any videos of our pumps in action. I will say, if we did, the only thing you would see between the 1.5 and 6cfm pump is how fast the air is removed from the bag. The amount of pressure is the same, either pump, only the evacuation rate is different.

For flat and smaller curved work the 1.5cfm pump is fine. As the work gets bigger and the volume of air increases, especially on curved work, then the 6cfm is the better choice.


 
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rem81

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Joined: 2016-02-04

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Subject : RE: Videos of Pumps in Action
Posted : 2016-05-02 4:33 PM
Post #37484 - In reply to #37480
Thanks for the response, Darryl. Let me see if I am understanding this correctly:

1.5cfm is okay for flat work because the curved form does not been to be 'stabilized' as the air is being removed from the bag; it can essentially sit flat and it's not going to try to flex while air is being exhausted, so time is not of priority. The reason you recommend a 6cfm pump for curved work is because it has to be 'stabilized' in place for a shorter duration as air is being removed? If this is the case, doesn't bag volume and the ratio of positive and negative space inside the bag have a large role to play in terms of the potential air to be removed?

Please excuse me while I try to understand. Thank you again for your help.


 
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Darryl Keil

Posts: 1453

Joined: 2003-05-22
Location: Maine

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Subject : RE: Videos of Pumps in Action
Posted : 2016-05-02 6:42 PM
Post #37485 - In reply to #37484
There's really no issue about "stabilization", it's just about how long it takes to get the air out of the bag. With curved work it naturally takes more time to evacuate the air as opposed to a flat panel. The 1.5cfm pump will take considerably longer than the 6cfm pump to remove the air. If the curved form is large enough the glue could start to tack up before bag begins to apply pressure. This is why we recommend sticking with a 4x4 bag with the 1.5cfm pump. If you want to consider a bigger bag, and you think you might press a variety of curved panels then go with the 6cfm pump.


 
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Enrico Konig

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Joined: 2006-01-06
Location: Vancouver, BC

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Subject : RE: Videos of Pumps in Action
Posted : 2016-05-02 7:39 PM
Post #37486 - In reply to #37485
I've been using the 1.5 cfm pump for a dozen years and make my living doing curved work, with a 6' x 10' bag. The only time I have had any issues is when it's particularly warm in the shop and I'm attempting a multi-layered lamination. Luckily I'm in the Pacific Northwest so it doesn't get that warm that often. Keeping the resin in the fridge helps considerably in those situations. That being said, if I ever have to buy a new pump I would get the 6 cfm.


 
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rem81

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Joined: 2016-02-04

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Subject : RE: Videos of Pumps in Action
Posted : 2016-05-04 11:48 AM
Post #37487 - In reply to #37486
Thank you both for your responses. It sounds like the 6cfm is the way to go for me, but the price tag is the only thing holding me back. Does this forum have a classified section? My guess is that Darryl doesn't want these things trading hands here


 
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Darryl Keil

Posts: 1453

Joined: 2003-05-22
Location: Maine

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Subject : RE: Videos of Pumps in Action
Posted : 2016-05-04 12:59 PM
Post #37488 - In reply to #37487
I do have a rule about not selling things on this forum because I want to keep this forum about information and education only. Selling "muddies up the water", so to speak.
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