DedTru Fixtures


When you install a DEDTRU Model C and/or Model C6 Centerless Grinding Fixture on a precision surface grinder,you create a centerless grinding system capable of highly precise thrufeed, infeed and ID/OD plunge grinding. This centerless system is easy to use and requires only a fraction of the time usually needed to set-up a conventional centerless grinder. Both the standard Models C and C6 are designed for OD/ID grinding of parts with diameters from 1/4" to 1-1/4". However, these Fixtures can grind both larger and smaller diameter parts with special tooling.

Using a DedTru Fixture in conjunction with a surface grinder creates an unique centerless grinding system which grinds straight and round parts for thrufeed applications. The DedTru is ideal for plunge grinding parts which need to be concentric from one diameter to another. DedTru Fixtures also perform infeed operations which require extremely precise roundness.

DedTru Grinding Fixtures are manufactured on a rugged cast aluminum base which supports a precision Regulating Roll, Work Blade, Guide and Rest Plate (for thrufeed grinding) and Pressure Roll (for plunge grinding). A Spindle supports the Regulating Roll, driven by a variable speed power supply. Unison's proprietary Spindle design forms the foundation of the DedTru Fixture's precision in roundness, straightness and concentricity. Our method of applying preloaded bearing support for the Spindle assures the Regulating Roll does not move either axially or radially with respect to the base during grinding. In addition, this method of preloading the bearings does not introduce deformation in the Spindle. Most importantly, all of our DedTru's are manufactured with super high precision bearings which virtually eliminate run-out. The running accuracy of our bearings is the highest available in the industry (ABEC Class 9). The Model C and Model C6 Fixtures can consistently grind parts to a roundness accuracy within five millionths of an inch depending on your specific application and grinding environment.

Every DedTru is supplied with a work blade support which allows the operator to raise/lower the work blade and/or adjust/swivel the blade for thrufeed or plunge applications. The operator can also adjust the height of the rest plate/guide plate as necessary during thrufeed applications. DedTru Fixtures also allow the operator to adjust the pressure roll during plunge work.

The Dedtru is equipped with a built-in manifold to provide coolant to the Regulating Roll and coolant is also supplied to two coolant tubes as well as to the location of the Kooldress Cluster Diamond for dressing your grinding wheels. A wiper is also furnished with each Dedtru Fixture to keep the Regulating Roll's surface clean during operation.

Each DedTru is supplied with a Sine Base for mounting the Fixture to your surface grinder. The Sine Base is furnished with four Cradle Blocks which allow the operator to tilt the Fixture either toward or away from the surface grinder's column.

The Power Supply allows the operator to control the regulating roll speed, as well as the forward/neutral/reverse switch. The Power Supply also includes a place for the operator to plug-in an optional Limit Switch Assembly.

The following are the Standard Accessories furnished with each DedTru Fixture to allow you to thrufeed, plunge and infeed grind parts with diameters of between 1/4" to 1-1/4":

1 Carbide-tipped Work Blade for throughfeed grinding
1 Rest Guide Assembly
4 Pairs of Guide Risers for thrufeed applications
1 Work Blade for plunge grinding
1 1-1/4" Diameter Pressure Roll Assembly for plunge grinding
1 Kooldress cluster diamond for dressing grinding wheels
1 Infeed Slide Assembly for infeed applications
2 Adjustable Coolant Directing Tubes
1 DedTru Sine Base Assembly
1 Regulating Roll
1 Regulating Roll Wiper
1 Variable Speed Power Supply
1 Carbide-tipped Part Stop
1 Coolant Pump and Coolant
1 Supply Hose and Flow Control Valve
3 Adjustment Wrenches
1 Operator's Manual
1 Custom-made IPPC approved storage/shipping crate

DedTru Fixtures are easy to use and a self-instruction manual is provided. However, if training is requested, we can provide it at Unison's facility for a fixed price per day. Instruction is customized to each customer's specific needs for thrufeed, plunge and/or infeed operations with hands-on experience for the operator. Customers are encouraged to bring their parts with them so we can recommend the best approach for grinding them.


Suggestions for equipping your surface grinder for a DedTru fixture.

In addition to the DedTru Fixture, your surface grinder should be equipped with the following optional accessories which are available from Unison. These items are not included with your DedTru Fixture and must be ordered separately:

Splash Pan Assembly with Drain Hose (116-0000) - Specify make & model of your surface grinder
FilTru Tank Filter Assembly (079-0000)
FilTru Coolant Settling Tank (080-0000)
Limit Switch Control Assembly (077-0000) - Starts and stops the Regulating Roll to facilitate loading/unloading of parts
Regulating Roll Dresser
Additional Work Blades and Guides for your specific application

Additional Options can be found in DedTru Parts Brochure.


Your surface grinder.

For precise grinding and the best part finish, your surface grinder must be of rigid construction. The base and column should be capable of absorbing grinding forces with a minimum of deflection. Unison suggests you use a 3 horsepower grinding spindle and it should be adequately preloaded, both axially and radially, to prevent movement of the grinding wheel under varying conditions. The vertical, longitudinal and crossways must be in good condition and the slides should have non-measurable movement in the planes at right angles to their direction of motion.

For additional information regarding the products of Unison, please contact our Marketing Department at (248) 544-9500; fax us at (248) 544-7646 or e-mail us at sales@unisoncorp.com


Model C - Image Gallery

Model C6 - Image Gallery



When you install a DedTru Model PGF Centerless Grinding Fixture on a precision surface grinder, you create a centerless grinding system capable of highly precise ID/OD, infeed and plunge grinding. This centerless system is easy to use requires only a fraction of the time usually needed to set-up a conventional centerless grinder. The standard PGF Fixtures is designed for grinding parts with diameters from 1/4" to 1-1/4". However, these Fixtures can grind both larger and smaller diameter parts with special tooling. Using a Model PGF Grinding Fixture in conjunction with a standard surface grinder creates a unique centerless grinding system which can plunge grind both straight and round parts. The PGF Fixture is ideal for plunge grinding parts which need to be concentric from one diameter to another. These DedTru Fixtures also perform infeed operations which require extremely precise roundness.

DedTru Grinding Fixtures are manufactured on a rugged cast aluminum base which supports a precision Regulating Roll, Work Blade and Pressure Roll Assembly. The Regulating Roll is powered by a variable speed motor and is connected to our proprietary Spindle which forms the foundation for the DedTru Fixture's precision in straightness and concentricity. All of our DedTru's are manufactured with super high precision bearings which are uniquely installed so the Regulating Roll does not move, either axially or radially with respect to the base during grinding. These bearings virtually eliminate run-out since their running accuracy is the highest available in the industry (ABEC Class 9). Extreme care is exercised at Unison during the installation of the precision bearings to apply the exact preload necessary to maintain the close tolerances the PGF is capable of holding with respect to roundness, straightness and concentricity. The Model PGF Fixture can consistently grind parts within roundness accuracy of five millionths of an inch depending on your specific application and grinding environment.

The PGF Fixture was designed so the operator has the maximum access to the part being ID ground. This DedTru can also be used for OD infeed and plunge grinding. The PGF is supplied with a steel core Regulating Roll which is 2" wide and 5" in diameter. An optional 3" wide Regulating Roll is available upon request. Regulating Rolls can be quickly and accurately interchanged since they mount to an adaptor which fits the same spindle taper of both the 2" wide and 3" wide Regulating Rolls.

Every Dedtru is supplied with a work blade support which allows the operator to raise/lower the work blade for plunge applications. The operator can also adjust the pressure roll as necessary to hold the part.

DedTru's have a built-in manifold to supply coolant to the Regulating Roll and to additional outlets located on the Fixture. A wiper is also supplied to keep the regulating roll's surface clean.

Each Dedtru is supplied with a Sine Base for mounting the Fixture to your surface grinder. The Sine Base is furnished with four Cradle Blocks which allow the operator to tilt the Fixture toward or away from the surface grinder's column.

DedTru Fixtures are also supplied with a Power Supply which allows the operator to control the speed of the Regulating Roll as well as the forward/neutral/reverse switch. The Power Supply also includes a place for the operator top plug-in an optional Limit Switch Assembly.

The following are the Standard Accessories furnished with each PGF Fixture to allow you to grind parts with diameters of between 1/4" to 1-1/4":

1 2" x 1/4" Carbide-tipped Work Blade
1 1-1/4" Diameter Pressure Roll Assembly for plunge grinding
1 Kooldress cluster diamond for dressing grinding wheels
2 Adjustable Coolant Tubes
1 DedTru Sine Base Assembly
1 Regulating Roll
1 Regulating Roll Wiper Assembly
1 Variable Speed Power Supply
1 Carbide-tipped Part Stop
1 Coolant Pump and Coolant
1 Supply Hose and (1) Flow Control Valve
3 Adjustment Wrenches
1 Operator's Manual
1 Custom-made IPPC approved storage/shipping crate

DedTru Fixtures are easy to use and a self-instruction manual is provided. However, if training is requested, we can provide it at Unison's facility for a fixed price per day. Instruction is customized to each customer's specific needs for thrufeed, plunge and/or infeed operations with hands-on experience for the operator. Customers are encouraged to bring their parts with them so we can recommend the best approach for grinding them.


Suggestions for equipping your surface grinder for a DedTru fixture.

In addition to the DedTru Fixture, your surface grinder should be equipped with the following optional accessories which are available from Unison. These items are not included with your DedTru Fixture and must be ordered separately:

Splash Pan Assembly with Drain Hose (116-0000) - Specify make & model of your surface grinder
FilTru Tank Filter Assembly (079-0000)
FilTru Coolant Settling Tank (080-0000)
Limit Switch Control Assembly (077-0000) - Starts and stops the Regulating Roll to facilitate loading/unloading of parts
Regulating Roll Dresser
Additional Work Blades and Guides for your specific application

Additional Options can be found in DedTru Parts Brochure.


Your surface grinder.

For precise grinding and the best part finish, your surface grinder must be of rigid construction. The base and column should be capable of absorbing grinding forces with a minimum of deflection. Unison suggests you use a 3 horsepower grinding spindle and it should be adequately preloaded, both axially and radially, to prevent movement of the grinding wheel under varying conditions. The vertical, longitudinal and crossways must be in good condition and the slides should have non-measurable movement in the planes at right angles to their direction of motion.

For additional information regarding the products of Unison, please contact our Marketing Department at (248) 544-9500; fax us at (248) 544-7646 or e-mail us at sales@unisoncorp.com


Model PGF - Video

Model PGF - Image Gallery



The Model IGF DedTru Fixture turns your existing surface grinder into an ID grinder. The Model IGF is designed for applications requiring the grinding of the ID of parts where the ID is closely concentric to the OD.

The Model IGF Centerless Grinding Fixture can be installed on most standard surface grinders. It is easy to set-up and can accommodate long or short parts which can be removed at any time during grinding without introducing measurable errors.

The Model IGF provides easy adjustment in the vertical and horizontal directions to accommodate small parts with diameters ranging in size from 1/4" to 5" OD. The IGF is supplied with a standard pressure roll assembly that is adjustable by means of a spring to hold the part firmly against the blade and regulating roll during grinding. The pressure roll is adjustable so the part can feed axially along the regulating roll in either direction up to the location of an end stop. Optional rollers (1-1/4" and 1/2" diameter) and end stop configurations are available to accommodate most applications.


Suggestions for equipping your surface grinder for a DedTru fixture.

Quick set-up and the IGF Fixture can be changed from one part to another in minutes.
Parts can be removed from the fixture for inspection of size, taper and/or concentricity and be replaced in the fixture without making any adjustments to the current setup.
Fast internal grinding of parts

More Advantages:

Low cost method of ID grinding
Long internal bores can be quickly ground
The IGF works well when grinding thin-walled parts
Fast Center Height Adjustments

Check our DedTru Grinding Systems brochure.

For additional information regarding the products of Unison, please contact our Marketing Department at (248) 544-9500; fax us at (248) 544-7646 or e-mail us at sales@unisoncorp.com


Model IGF - Video

Model IGF - Image Gallery


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