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Comatic Vacuum Clamp Set for Edgebander. Made with both professionals and hobbyists in mind, the VH03 Vacuum Clamp Set is suited for edgebanding or edge tape application o Lead Time: 5 Days. View Details. Spare Suction cup for Stackers. Spare Suction Pad for use on Stackers. Spare White Suction pad for Biesse. Suction cup for Bussellato. The black plate is the base, and is mounted to your VMC Table.

Also shown are two machinable fixture plates. With a system like this, the vacuum keeps the fixture plates locked onto the base. But, bleed the vacuum and you can instantly unlock the fixture plates and change to some other workholding solution. Woodturning of bowls and spheres is another application that benefits from Vacuum Chucks. If the wood leaks too much vacuum, the part will not be held securely.

The white material is an open cell foam used for gasketing. Note that it is also in the center to support the workpiece from bowing. Each pocket holds a workpiece…. Here is his vacuum table with improvised coolant trap important to avoid screwing up the pump!

Household water filter serves as a coolant trap for the vacuum line…. Converting a compressor like this results in a much more efficient vacuum pump than the venturi systems, but you do have to be pretty serious about vacuum fixturing and have a spare compressor laying around somewhere! Interesting thought: to pull a vacuum, the compressor must overcome a pressure differential of To compress to normal shop air pressures, it needs 10x that much pressure differential.

Doing duty as a vacuum pump is much easier on the compressor. Geoff suggests a 2HP converted to vacuum pump is plenty. He just happened to have the 5HP available. Only a single vacuum port is needed unless you plan to set up multiple pieces at a time. I put the port near the bottom left corner, and made that corner the origin for all my programs.

You can see that I put in lots of holes for ports. This was a mistake, because I had to divert the gasket around each one of these holes. Feedrate was kept low to create the smoothest possible surface. Face the top after the grooves are milled. Round the corners of each raised square, for the same reason.

The grooves should be spaced so that the distance from the outside edge of one groove to the opposite edge of the next is a fraction of an inch. Your stock will likely be measured in whole inches. You need to be sure that the stock completely overlaps the seal.

The grooves should be about. The foam compresses a lot, and you want a good seal. I made my grooves 0. Put a vacuum gauge on your pump so you can verify the seal. Also put a ball valve on the pump, so you can quickly apply or release vacuum without power cycling the pump.

The Harbor Freight vacuum pump works fine, but does put out some oily smoke. Also, it is not compatible with flood coolant. When programming, touch off your Z to the table, then jog up to set your zero. Since your zero is relative to the table, you can do clever tricks like cutting almost all the way through material without breaking the seal or milling into the table.

Any workholding solution has major problems when a part breaks loose. But vacuum chucks and fixtures can be more prone to it unless special precautions are taken. I jumped about two feet when this plate broke loose from the vacuum fixture while the pocket floor was being machined:. He had actually dialed things back quite a bit to try to keep it happy, and I would have thought the majority of the worst cutting forces were done, but the part still broke loose. Nobody harmed, fortunately, but the part was scrapped.

That cutter grabbed the part, lifted it off the table, and had it spinning fast not long after. In this case, the part was light enough and the cutter large enough diameter, it all held together long enough to hit the E-Stop. A heavier part might have broken the cutter right away and gone sailing off into the enclosure.

Enclosures and definitely eye protection are important. Your holding force is proportional to the amount of vacuum times the surface area it can act on. Stronger vacuum helps, but you can only get strong to a point.

Getting a stronger vacuum is a function of having a strong enough pump and making sure leaks are minimized. More surface area for the vacuum is ideal and can often increase holding force more than increasing the vacuum.

Ideally, you want the entire under surface area of the part to have vacuum so you generate a lot more holding force. Our G-Wizard software has a built-in mini-calculator that is aimed at doing just that. These are the common vacuum pump types nad each one produces a little different amount of vacuum. If you have a vac gage you can even enter the exact amount into the vacuum field. Easy for square parts. For irregular parts, your CAD package can almost always calculate the area.

Note that if your vacuum fixture is aluminum or something non-permeable, you actually want the surface area of the vacuum chambers under the part.

By default, we use a 2x safety factor on the calculator. So whatever we calculate the hold-down force to be, we will halve that or divide by whatever factor you give just to give some margin for error and things like vacuum leaks.

This is valuable because tall parts with not very big bases are tough on vacuum fixtures. Such parts are not the best idea for a vacuum fixture, and if you exceed the height, I would hump up the safety factor to be sure things stay put. The last thing is G-Wizard Calculates the maximum spindle torque. Here again, we make a fairly conservative assumption in these calculations. We are protecting against ALL of that force being translated into an upward force that pulls the part off the table.

When you do, you will see the torque limit of oz-in. Having the ability to limit cutting forces with a safety margin can really help with vacuum fixturing! When you cut all the way through the workpiece, the cut can bleed off vacuum which can cause the part to break loose. For example, you might gasket just inside the finished out edge of a part and any through-holes in the part.

Do your roughing, which has the heaviest cutting forces, without cutting all the way through. Leave a very thin floor of material that is cut by a final finish pass using very low cutting forces. Even if you do cut all the way through, you may want to leave tabs that limit the parts ability to move and potentially pop loose. Dust, grit, and other contamination will make it harder to hold the vacuum seal.

Keep all surfaces clean! Need to flip parts on a vacuum table and keep things lined up? Dowel pins are a common solution. Either put holes in the parts and table sacrificial MDF bleeder board only!

Using the part sides only works if the part is symmetrical so flipping it will still line up against the same stops. But if you can use pins in holes in the part, you can arrange the holes to be symmetrical regardless of the part shape.

One of my long time readers uses cereal box cardboard:.

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