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| BROCHURE STANDARD HYDRAULIC TOMBSTONE (181KB Adobe® .pdf format) | |||||||||||||||||||||||
| STANDARD HYDRAULIC TOMBSTONE FOR MACHINING U-JOINT YOKES |
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The PROHOLD® Standard Hydraulic Tombstone above has eight 2-jaw chucking stations with the jaws orientated horizontally. The pulldown clamps are shown above in the clamp position. To operate the tombstone the operator plugs in a 24-volt DC power supply plug to the connector on the top of the tombstone manifold. This supplies 24-volt DC to the internal hydraulic pumping unit. The operator then rotates the manual valve to the open or unclamp position. The pulldown clamp moves outward and simultaneously indexes approximately 90º to make room for loading of the parts in each of the two chucking stations on that face. If you look closely at the left-hand picture, you can see a stationary rest just below the top chucking station on the left side of the tombstone [there is only on installed on the tombstone in these pictures]. This aligns the part approximately level with the axial centerline of the chucking station. Once the parts are loaded in each chucking station, the operator rotates the manual valve to the close or clamp position. The pulldown clamp indexes back to its vertical position and then clamps down on the ears of the U-joint yoke, pressing the yoke down into the jaws of the chucking station. Then the jaws sequentially clamp down on the round machined diameter fo the yoke for a very rigid clamp on the part from top to bottom. Each face is loaded using the same protocol. After the tombstone is completely loaded with parts, the operator disconnects the 24-volt power cord, and the parts on the tombstone are ready for machining. |
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| STANDARD HYDRAULIC TOMBSTONES FOR HAAS HORIZONTAL MACHINING CENTERS |
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| REMOVABLE HYDRAULIC CUSTOM TOOLING FACEPLATES FOR STANDARD HYDRAULIC TOMBSTONES |
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PROHOLD® Standard Hydraulic Tombstones, with or without built-in chucking stations on each face, can accept custom hydraulic faceplates with top modular or custom tooling. The faceplates above are used to machine composite plastic valve bodies instead of the bronze valve bodies that are machined using the 2-jaw self-centering chucking stations on the tombstones in these pictures. When the faceplates are not in use, the tank and pressure ports on each face of the tombstone are sealed with a #2 SAE plug. Faceplates are pin located and bolted on the tombstone face after removing the bronze valve body top jaw tooling and the #2 SAE plugs. When installed, each faceplate is supplied with hydraulic fluid power from the tombstone internal hydraulic pump unit, through the tank and pressure porting on each tombstone face and O-ring seals into the tank and pressure port on the backside of the faceplate [see the two holes in the middle of the faceplate in "View 2" above] to actuate the top custom hydraulic tooling components. PROHOLD® Standard Hydraulic Tombstones provide an underlying workholding system versatile enough to not only accommodate families of parts but also other non-family parts through the utilization of this custom faceplate feature available on all PROHOLD® hydraulic tombstones. This feature allows for the use of any faceplate on any horizontal or vertical machining center using PROHOLD® standard hydraulic tombstones. Faceplates can be universally mounted throughout the plant on any machine using the PROHOLD® workholding system, thereby providing a flexibility that is not as easily and readily available on any other workholding system available today. Instead of purchasing a new tombstone for other parts, all that is required is to add another faceplate at the fraction of the cost of building a whole new fixture. |
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| REMOVABLE MANUAL FACEPLATE "WORKHOLDER" TOOLING FOR SMALL PART PROCESSING |
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Even smaller parts can be run across the same machines using PROHOLD® standard hydraulic tombstones by mounting standard [PATENTED] manual workholding system on each face. The "Workholder" is useful for manually mounting the smallest of parts by clamping on the ID/inside or OD/outside of the part as required on tombstones bolted down to the machine table or used in a vice.
The " WORKHOLDER" is a modular workholding system which greatly improves the quantity of pieces that can be machined at a time. It can be manufactured or modified to suit the machine to be used on and the number of pieces to be machined. |
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Each station can be modified so they hold the same parts and/or different parts which allow multiple machining to be done without resetting up. With two or more "WORKHOLDER" systems used at the same time, one system can be loaded while the others are still machining. This system is very productive when used with a PROHOLD® standard hydraulic vise for quick change off the machine tool. |
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| 3-JAW, 4-CHUCK HYDRAULIC TOMBSTONE WITH CENTER PULLBACK CLAMPING SHAFT |
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The 3-jaw, 4-chuck hydraulic tombstone shown above has a sequenced centerline pullback clamping shaft for added clamping force on the part extra-heavy stock removal with minimal amount of chuck jaw surface contact on the part. The pullback clamp is sequenced to pull the part back against the jaws prior to the jaws clamping onto the part. This tombstone has the standard internal 24-volt hydraulic pump unit that uses an external 24-volt DC power supply for the electric current to run the internal hydraulic pumping unit. There are two identical tombstones mounted on an Okuma MA-40HA machining center. |
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| MORE STANDARD HYDRAULIC TOMBSTONE CONFIGURATIONS |
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This 3-jaw chucking tombstones can be fitted with custom faceplates using either hydraulic or manual top tooling [the same as the 2-jaw tombstone at the top of this page]. Using a second vise on the top station [far right picture above] you could hold long irregular or rectangular parts the full length and width of the face of the tombstone. Using quick change custom aluminum soft jaws or machinable steel jaws on any of the chucking stations, or vise stations, provides a very versatile and flexible system capable of holding round, rectangular or irregular shaped parts on one fixturing tombstone base, not to mention the capability of also mounting those custom hydraulic or manual faceplates for other odd shaped parts. Faceplates with hydraulic top tooling would get their fluid power from the internal 24-volt, closed-loop hydraulic pump unit. |
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