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Machinists Helper Home of XLTrig© |
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Tips
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Pallet Vise
Take a new or used lockdown type vise, and modify as follows: Using a .5000 ball end mill, groove the rigid and moving jaws as shown in picture, make grooves .2495 deep. Make sure that both jaws are dialed in right to the tenth. I put the groove right through the 1/2-13 holes. Using a layout of your liking, I used one on center, and one in 1/2" from each end, drill and tap 8-32. Using .5000 TGP, make two rails, and drill and countersink them for 8-32 SHCS. When making pallets, make matching grooves, Put a rather healthy stop on the right side of the pallets that will hit the rigid jaw of the vise. I put a drill bushing in one pallet of each set, and dial in the bushing as a reference for the ensuing work. When locking the pallets in the vise, use a torque wrench. I usually use between 25 and 75 inch pounds. With all of the surface contact this is a lot of holding power. Always use the same torque that you used when making the fixture. The combination of the round member and the sides will cause the pallet to repeat position each time you torque. The round features are easier to keep clean than dovetails. Now machine your particular fixture, D&T holes or however you are going to hold this part in each pallet. When done you can machine one set of parts while loading / unloading the other pallet. |
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