Vacuum Pumps - Page 2 - Woodworking Talk - Woodworkers Forum
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post #21 of 31 Old 10-23-2015, 10:28 AM
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Quote:
Originally Posted by thenodemaster View Post
...who mentioned his complaints about the diaphragm pumps--which, after his explaining to me everything, I completely wrote off diaphragm pumps as an option.
Fair enough.
I have no complaints about the JT pump though. It's been a real solid performer in a production situation for several years now.
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post #22 of 31 Old 10-23-2015, 12:36 PM
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The suitability of a vacuum pump depends on both the intended application and the specs of the particular model regardless of the type of pump. For vacuum chucking on the lathe, where the requirements aren't very stringent you can find suitable pumps in all three categories. But, you can generalize about the characteristics of the three categories. Piston pumps are capable of pulling a hard vacuum and are the best for HVAC use, but the flow rate isn't high and lubricant is in the flow stream. Diaphragm pumps pull a soft to moderate vacuum with a flow rate that is between the piston and rotary vane pumps. Rotary vane pumps pull a high vacuum that typically isn't quite enough for HVAC applications and they have a high flow rate. Rotary vane pumps come in two flavors ... lubricated and dry. You can find a lot of performance variation in each category as well as a lot of overlap between the three types of vacuum pumps. While on average the dry rotary vane pump looks like the best fit for woodturning vacuum chucking, we can't exclude all diaphragm and piston pumps because there are plenty of models that will fit the needs of vacuum chucking. Also, the "requirements" of vacuum chucking are soft requirements that are somewhat overstated to give a lot of safety margin. In the early days of vacuum chucking some people used shop vacs and found them to be perfectly suitable (soft vacuum, but huge air flow that can overcome lots of leaks) ... the problem was that the shop vac motor, starved of cooling air, would burn up from lack of adequate cooling air. These shop vac systems also used simple rotary couplers that were just a slip fit between two cylinders.

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post #23 of 31 Old 10-25-2015, 05:18 PM Thread Starter
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I looked at the shop vacuum setups and was not impressed. While I do not have a lot of money, from what I have seen, I have enough of a budget to allow for a decent quality pump...just waiting to see if I can get off cheap with my coworker's of if I need to hit the store. Not really a bad thing if I have to buy a pump at the store, but, I can't think of anyone who would be opposed to saving $$$ when they can. I have been burned by cheap chinese garbage before which is why I am being careful with something that holds a chunk of wood which would easily rearrange my pretty face!

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post #24 of 31 Old 10-25-2015, 06:14 PM
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Have you looked at the refurbished Thomas vacuum pumps from FrugalVacuumChuck.com. He has been at SWAT for the last two years and there has always been a crowd around his booth buying vacuum pumps. He rebuilds them to essentially new condition. Everybody has been very pleased with the vacuum pumps that he has refurbished. You can buy just the vacuum pump or a complete kit if you wish.

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post #25 of 31 Old 10-25-2015, 06:52 PM Thread Starter
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Originally Posted by Bill Boehme View Post
Have you looked at the refurbished Thomas vacuum pumps from FrugalVacuumChuck.com. He has been at SWAT for the last two years and there has always been a crowd around his booth buying vacuum pumps. He rebuilds them to essentially new condition. Everybody has been very pleased with the vacuum pumps that he has refurbished. You can buy just the vacuum pump or a complete kit if you wish.
Never heard of them. Gonna go check it out! Thanks Bill!

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post #26 of 31 Old 10-25-2015, 11:23 PM
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Here is a testament to the power of vacuum chucking. I have vacuum plumbed into my work bench. I use foam gaskets to hold smallish work piece mostly cutting boards for sanding.

Vacuum Pumps-image-2889355486.jpg

Here is a piece of 1/2 plywood with vacuum applied over a 11x13 inch area. That is a 5 mm drill bit to show the scale of the gap.

Vacuum Pumps-image-2984330009.jpg

Vacuum is turned off in this picture.

Vacuum Pumps-image-4095167432.jpg
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post #27 of 31 Old 10-25-2015, 11:39 PM
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Here is another testament to the usefulness and power of vacuum. This is a 43x8 inch board with an even smaller gasket which means less holding power. That is 75 pounds of lead shot on the end. I assure you that vacuum is the only thing holding this board down. Vacuum Pumps-image-3753898543.jpg Vacuum Pumps-image-3191779407.jpg Vacuum Pumps-image-1642914069.jpg
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post #28 of 31 Old 10-26-2015, 09:06 AM Thread Starter
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Wow! Nice demo.

Dachshunds and pneumatic nailers do not mix. Whiskey. Tango. FOXTROT!
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post #29 of 31 Old 10-28-2015, 11:58 PM Thread Starter
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Well, I pulled the trigger on the Holdfast kit with the 3" and 6" chucks. My cohort at work failed to come through on the pumps he had as he had family health issues to contend with, so, no big deal on that. I got a 5CFM vane pump which fit nicely within my budget. It is an oiled on, but I have it on a hose setup that allows me to have it at the opening of my shop. My Grizzly's headstock was a bit on the longer side of the spectrum and the rod that came in the Holdfast kit was long enough--barely! LOL. Anyway, played around a bit with it once I picked up a few plumbing fittings and a bypass ball valve. Pulls about 26" of Hg and has a quick vacuum grab with the valve closed all the way. I was surprised at how quiet the pump is when in use. I was expecting a heck of a lot louder, but it ended up being slightly louder that the aeration pumps I used back when I had a reef tank. Gonna have fun with this one!

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post #30 of 31 Old 10-29-2015, 12:08 AM
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I have compressed air fittings on my pump and I use a compressed air hose. Some people will tell you that the hose will collapse, but I have never had any trouble. I even use a flexzilla hose which is pretty soft.
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post #31 of 31 Old 10-29-2015, 12:36 AM Thread Starter
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I have compressed air fittings on my pump and I use a compressed air hose. Some people will tell you that the hose will collapse, but I have never had any trouble. I even use a flexzilla hose which is pretty soft.
That was what I used as well. The extension hose I bought was much more rigid than the blue transparent one that came with the kit, so, I think it will do just fine. Will give it a go with actual turning this weekend--depending on how much the misses wants to party at our concert tomorrow night...

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