Grooving Inserts

I'm attaching 3/4" plywood to my base cabinets. How do I connect the seams for optimum stability?

I've heard that you shouldn't have seams over a dishwasher, so I am going to screw both to the nearest cabinet. But what is the correct way to do this? Do I need to bevel the edges of each plywood board to fit into eachother? Or can the factory edges just sit next to one another? I need to have a flush system, but am not sure how to reinforce the base cabinet (it's very thin and I don't know if both plywood boards will be able to be screwed in). Is there a standard way to do this? Thanks so much.

I am afraid, that you need to provide some details here....

Where are you placing the plywood, and why plywood? (Are you putting down a plywood base in preperation for tile work, for example?)
How many pieces?
Is the counter in a straight line, or angled?

Typical countertop mounting to cabinet bases would mean securing the top from underneath, by shooting a screw thru the corner braces of the cabinet,up into the countertop. For added strength where necessary, a small cleat can be added on one side or the other, of the cabinet wall. I would apply some glue to the cleat, and shoot screws in from the other direction (thru the cabinet wall) into the cleat. This would give a little more room and strength, to help secure the top from underneath.
Another option, is to use countertop fasteners to secure edges together. These can be found in most building supply stores, or online, at places like Rockler. Here is a sample of what I am talking about - http://www.rockler.com/product.cfm?page=10770&filter=countertop%20fastener
There are several versions of this type of fastener available. What it does, is pull the edges together...and is a very common item in commercial cabinet manufacturing. Just a note - these are installed from the Underside of the countertop material.

Another method of joining materials... take a router, and cut a groove into both edges, and then cut a piece of wood that will almost fill that groove, but not quite... This is called making a spline. Squeeze some glue (titebond works very well for this) into the grooves, insert the spline(s), and then use the 'zip bolt' to tighten them together. I say 'splines' because you do not want the spline where the zip bolt is at.
If you have a 'biscuit joiner' on hand, then that can be used instead of the router -- simply pop some biscuit joints at several places along the edges, glue, and insert the biscuits. (Biscuit joints can be cut with the special cutter, or router, with the appropriate router bit)
While at Rockler, just do a search on "Biscuit", and you will see several items pop up.

And of course, there is always the dowel :)

Let me know a little more about what you are attempting to do, be glad to help :)

Good Luck

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ISCAR GFR 4 8D IC 20 K 10 Carbide Inserts Grooving 10Pcs Lathe Cut Off New Tools
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New 4 Pcs NRP3094R Grade KC850 Gold Coated Grooving Inserts Kennametal
New 4 Pcs NRP3094R Grade KC850 Gold Coated Grooving Inserts Kennametal
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ISCAR GTR 5 8D IC 20 Carbide Inserts Grooving 10 Pcs Self Grip Cut Off Lathe New
ISCAR GTR 5 8D IC 20 Carbide Inserts Grooving 10 Pcs Self Grip Cut Off Lathe New
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ISCAR GTS 3 AL IC 20 Carbide Inserts Grooving 10 Pcs Self Grip Cut Off Lathe New
ISCAR GTS 3 AL IC 20 Carbide Inserts Grooving 10 Pcs Self Grip Cut Off Lathe New
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NEW TOOL FLO FLT 3R HCB CARBIDE GROOVING INSERT
NEW TOOL FLO FLT 3R HCB CARBIDE GROOVING INSERT
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Hertel Carbide Double Grooving Inserts IG 3062R Grade HT10 Qty 10 3000306
Hertel Carbide Double Grooving Inserts IG 3062R Grade HT10 Qty 10 3000306
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10 pcs TOOL FLO V85 530 EXT GP50F CARBIDE INSERTS 13634N4F THREADING GROOVING
10 pcs TOOL FLO V85 530 EXT GP50F CARBIDE INSERTS 13634N4F THREADING GROOVING
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10 pcs TOOL FLO V85 438 EXT GP50F CARBIDE INSERTS 12634N4F THREADING GROOVING
10 pcs TOOL FLO V85 438 EXT GP50F CARBIDE INSERTS 12634N4F THREADING GROOVING
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Lot of 19 KENNAMETAL Miscellaneous Indexable Carbide Inserts Turning Groove
Lot of 19 KENNAMETAL Miscellaneous Indexable Carbide Inserts Turning Groove
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BRAND NEW Kennametal NG 3167RK KC810 Top Notch Grooving Carbide Inserts 820SO
BRAND NEW Kennametal NG 3167RK KC810 Top Notch Grooving Carbide Inserts 820SO
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Over 200 Miscellaneous Indexable Carbide Inserts Turning Groove Threading Reamer
Over 200 Miscellaneous Indexable Carbide Inserts Turning Groove Threading Reamer
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ISCAR GIM 4 8RA IC 656 Carbide 10 Inserts Grooving Self Grip Cut Off Lathe Gold
ISCAR GIM 4 8RA IC 656 Carbide 10 Inserts Grooving Self Grip Cut Off Lathe Gold
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ISCAR SGIH 100 9 SELF GRIP Grooving Heavy Duty Blade Carbide Inserts Lathe
ISCAR SGIH 100 9 SELF GRIP Grooving Heavy Duty Blade Carbide Inserts Lathe
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SANDVIK Coromant TLJK 300R26 P40 C6B Lathe Grooving Carbide Inserts 8 Pcs New
SANDVIK Coromant TLJK 300R26 P40 C6B Lathe Grooving Carbide Inserts 8 Pcs New
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ISCAR GTR 4 8D IC 54 Carbide Inserts IC 20 Grooving 10 Pcs Lathe Cut Off New
ISCAR GTR 4 8D IC 54 Carbide Inserts IC 20 Grooving 10 Pcs Lathe Cut Off New
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NG211LK KC730 Kennametal Carbide Grooving Inserts 10 pcs
NG211LK KC730 Kennametal Carbide Grooving Inserts 10 pcs
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Iscar Adapter CGPAD 3L T16 for use with GIP GIF GIM groove turn carbide inserts
Iscar Adapter CGPAD 3L T16 for use with GIP GIF GIM groove turn carbide inserts
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MANCHESTER 508 130 20 C2 GROOVING INSERTS AA3135 10
MANCHESTER 508 130 20 C2 GROOVING INSERTS AA3135 10
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NG6375L K68 KENNAMETAL CARBIDE GROOVING INSERTS 5 PCS TOP NOTCH
NG6375L K68 KENNAMETAL CARBIDE GROOVING INSERTS 5 PCS TOP NOTCH
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NG 4125RK KC730 Kennametal Carbide Top Notch Grooving Inserts 5 PCS 1114247
NG 4125RK KC730 Kennametal Carbide Top Notch Grooving Inserts 5 PCS 1114247
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ALLIED USA CARBIDE INSERT 1 LATHE GROOVING TOOL HOLDER GH 44LH 128
ALLIED USA CARBIDE INSERT 1 LATHE GROOVING TOOL HOLDER GH 44LH 128
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LOT of 2 US TOOL CARBIDE INSERT LATHE GROOVING TOOL HOLDERS GROOVEALL SMR 100 24
LOT of 2 US TOOL CARBIDE INSERT LATHE GROOVING TOOL HOLDERS GROOVEALL SMR 100 24
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5x Grooving inserts 211oz009 von KENNAMETAL neu T1988
5x Grooving inserts 211oz009 von KENNAMETAL neu T1988
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Kennametal ND3040R KC850 Top Notch Grooving Carbide Inserts 4 Inserts
Kennametal ND3040R KC850 Top Notch Grooving Carbide Inserts 4 Inserts
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Tool Flo Carbide Grooving Inserts FLRP4094R Grade GP3 Box of 8 594894RJ5 USA
Tool Flo Carbide Grooving Inserts FLRP4094R Grade GP3 Box of 8 594894RJ5 USA
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10pcs ISCAR GFG 40 R0 IC656 GROOVING CARBIDE INSERTS CNC LATHE FREE SHIPPING
10pcs ISCAR GFG 40 R0 IC656 GROOVING CARBIDE INSERTS CNC LATHE FREE SHIPPING
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SANDVIK Coromant TLTF 4R 008R TN 6 Top Lathe Grooving Carbide Inserts 16 Pcs New
SANDVIK Coromant TLTF 4R 008R TN 6 Top Lathe Grooving Carbide Inserts 16 Pcs New
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100PCS SP300 NC3030 Single head grooving carbide inserts CNC tool External
100PCS SP300 NC3030 Single head grooving carbide inserts CNC tool External
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Valenite 15 x 455 Grooving Threading Bar GTB 175 LH TPMA 43 Insert
Valenite 15 x 455 Grooving Threading Bar GTB 175 LH TPMA 43 Insert
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10 pcs SANDVIK N123H2 0400 0008 TM 2135 4 mm grooving turning inserts
10 pcs SANDVIK N123H2 0400 0008 TM 2135 4 mm grooving turning inserts
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10 x GRIP 4004Y P20 P30 TIN Grooving inserts For Steel new with invoice
10 x GRIP 4004Y P20 P30 TIN Grooving inserts For Steel new with invoice
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BRAND NEW Kennametal NR 4118R K420 Grooving Carbide Inserts 726SO
BRAND NEW Kennametal NR 4118R K420 Grooving Carbide Inserts 726SO
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BRAND NEW Kennametal NR 4031R K313 Grooving Carbide Inserts 728SO
BRAND NEW Kennametal NR 4031R K313 Grooving Carbide Inserts 728SO
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BOX  10  KOMET W29 240000461 DRILL DRILLING CARBIDE TURNING GROOVING INSERTS
BOX 10 KOMET W29 240000461 DRILL DRILLING CARBIDE TURNING GROOVING INSERTS
$24.75
Sandvik 5736565 N123T3 0050 RS grd1125 025mm RE grooving insert lot of 2pcs
Sandvik 5736565 N123T3 0050 RS grd1125 025mm RE grooving insert lot of 2pcs
$15.00
BOX  10 PCS  KOMET W59 180500403 TURNING T4 321004 U GROOVING CARBIDE INSERTS
BOX 10 PCS KOMET W59 180500403 TURNING T4 321004 U GROOVING CARBIDE INSERTS
$39.75
10PCS Korloy MRMN600 M NC3020 Carbide grooving insert for Steel
10PCS Korloy MRMN600 M NC3020 Carbide grooving insert for Steel
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2 PCS NIKCOLE GIE 7 SG 07 SG Carbide Groove  Cut off Insert Grade C5 PV RH
2 PCS NIKCOLE GIE 7 SG 07 SG Carbide Groove Cut off Insert Grade C5 PV RH
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2 PCS NIKCOLE C6PV P25PV Carbide Groove  Cut off Insert
2 PCS NIKCOLE C6PV P25PV Carbide Groove Cut off Insert
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