P/N 1295 Vacuum Chuck Kit
Vacuum Grid Chuck Systems Quick Start Guide Northern Engineering & MFG, Inc. rd
11841 243 Ave NW Zimmerman, MN 55398 Voice: 763.856.2044 http://www.nemi.com 1
P/N 1295 Vacuum Chuck Kit
Vacuum Chuck Kit Contents
Your new NEMI Vacuum chuck Kit contains the following components:  (1) 9.5” x 17.75 x 1” Vacuum chuck ‐ P/N 1284  (1) 4.03 CFM Vacuum Generator – P/N 1278  (13) Port Plugs – P/N 724  (13) Port seals – P/N 725  (1) Magnet with Handle – P/N 694  (1) Shutoff Valve – P/N 1360‐375  (15’) Vacuum Rated Hose – P/N 1358  (10’) ¼ x 5/16” EPDM Foam “D” Gasket – P/N 1285  (5’) ¼” Round EPDM Foam Gasket – P/N 796  Instructions 2
P/N 1295 Vacuum Chuck Kit
Setting up the NEMI Vacuum Grid Chuck
Setting up and using the NEMI Vacuum Grid Chuck is fast and simple! First, the chuck must be installed on the machine. This can be done in one of two ways. Mounted directly to the T‐Slot table (Figure “P”) or mounted in vises (Figure “Q”). See page 10 for detail information. Vacuum Inlet
½” SHCS
Mounting Bolts
Figure “P”
Vacuum Inlet
Machine Vises
Figure “Q”
3
P/N 1295 Vacuum Chuck Kit
Setting up the Vacuum Grid Chuck (cont’d)
Once the chuck is installed in the machine, the vacuum line can be hooked up. The kit includes 15’ of vacuum rated hose. This should allow mounting the generator outside the machine and routing the hose to the chuck. The vacuum generator requires compressed air to function. Be sure and place the vacuum generator near a compressed air hose. Figure “R” illustrates one example of the generator on the front of the machine and the vacuum hose running in from the side. Vacuum Generator
Side Access Door
Figure “R”
4
P/N 1295 Vacuum Chuck Kit
Setting up the Vacuum Grid Chuck (cont’d)
Using the supplied hose clamps, connect the other end of the vacuum hose to the chuck. *NOTE* The arrow on the shutoff/slider valve *must* point towards the chuck. Failure to connect properly will result in loss of vacuum. See Figure “T”. Point towards chuck
Figure “T”
5
P/N 1295 Vacuum Chuck Kit
Using the NEMI Vacuum Grid Chuck
For thin and flat plate applications, using the included ‘D’ shaped or round gasket simply gasket off the required area respective to the workpiece as shown: Workpiece Gasket The gasketed area can be sealed off at the ends in one of two ways: The gasket material can be cut Gasket cutting can be avoided by using approximately ¼” long and then pressure the configuration above. butted to the other end. 6
P/N 1295 Vacuum Chuck Kit
Using the Vacuum Grid Chuck (cont’d)
With the gasket in place, simply remove the vacuum port plugs within the sealed off area using the included magnet. See the table in the technical data section for more information regarding vacuum plug usage & removal. With the gasket in place and the vacuum port plugs removed, place the workpiece over the sealed off area, turn on the vacuum and you’re ready to go! 7
P/N 1295 Vacuum Chuck Kit
Using the Vacuum Grid Chuck (cont’d) NOTE: When using the entire surface of the vacuum chuck, the mounting bolt holes must be segregated to avoid vacuum loss. See Figure “X”. Figure “X”
Emptying the Filter Trap The AIR PRESSURE MUST BE DISCONNECTED when emptying the filter trap. To empty the filter trap, turn the jug counter clockwise to loosen and remove the jug. Take care to not spill the trapped coolant/debris. 8
P/N 1295 Vacuum Chuck Kit
Technical Data
Vacuum Plug Usage & Removal When removing the vacuum port plugs it is important to keep in mind that you need only remove the number of plugs equal to the area of your vacuum supply hose inside diameter. Removing more plugs than this area is unnecessary. For example, (1) vacuum plug has an approximate area of .101 sq/in. A ¼” vacuum supply hose has an area of approximately .049 sq/in. Therefore, removing (1) vacuum plug would be sufficient. See the table below for more examples. Area
Supply Hose I.D.
(sq/in)
¼”
½” ¾”
1”
1-1/4”
1-1/2”
1-3/4”
2”
2-1/2”
3”
.049
.196
.441
.785
1.226
1.766
2.404
3.14
4.906
7.065
9
Number of Plugs
Removed
1 2
5
8
13
18
24
31
50
71
P/N 1295 Vacuum Chuck Kit
Technical Data (cont’d)
Basic Chuck Dimensions 10
P/N 1295 Vacuum Chuck Kit
Technical Data (cont’d)
Vacuum Generator Data 1. ¼” Male Industrial‐Shape Hose Coupling Compressed Air Inlet, Or 1/8” NPT port. (58‐110 PSI Recommended Operating Pressure) 2. 3/8” NPT Vacuum Connection 3. Exhaust 4. Filter Trap 5. 0‐30” hg Vacuum Gauge  27.9 In. Hg Vacuum Rating  3.39 SCFM Air Consumption  4.03 SCFM Vacuum Flow 11
P/N 1295 Vacuum Chuck Kit
A few words about Vacuum…
The basic science of vacuum clamping involves the atmosphere. Essentially all atmosphere from beneath the workpiece is removed. The atmosphere above and around the workpiece is what actually holds it in place. At sea level, the atmosphere provides 14.7 psi of holdown force. However, for every 1000 feet of elevation you lose about .49 psi of holdown force. For example, a workpiece held down by a 12” x 12” square area would effectively have 2116.8 lbs of hold down force at sea level. Vacuum is measured in inches of mercury (hg). A perfect vacuum is 30 inches of mercury (30 hg) but the maximum we can draw is 29.92Hg at sea level under perfect conditions. See the following table for examples. Altitude (FT) Atmospheric
Pressure
(psi)
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000 15000 Maximum Vacuum Attainable (Inches Hg) 14.7 14.16 13.66 13.16 12.68 12.22 11.77 11.33 10.91 10.50 10.10 9.71 9.34 8.97 8.62 8.28 29.92 28.86 27.82 26.82 25.84 24.89 23.98 23.09 22.22 21.38 20.57 19.79 19.02 18.29 17.57 16.88 Northern Engineering & MFG, Inc. rd
11841 243 Ave NW Zimmerman, MN 55398 Voice: 763.856.2044 http://www.nemi.com 12
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