Coaxial Indicator

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COAXIAL INDICATOR

Blake Coaxial Indicator

Blake Manufacturing is the original manufacturer of this unique CoAxial Indicator Centering device that easily locates the center of your work piece. Mr. John Blake filed his patent in 1955 & a couple years later (1957) US Patent Number 2814124 was successfully issued! Soon thereafter Blake Manufacturing was born! Today, most machinists know Blake Coaxial Indicators as the Premier Quality Brand for this type of CoAxial Indicator Centering device.

What is a Coaxial Indicator & What is it used for?

The BLAKE COAXIAL INDICATOR is a device that provides a simplified method for centering a workpiece or fixture on HORIZONTAL or VERTICAL machines, EXTERNAL or INTERNAL diameters and also with N/C, EDM and other hard-to-turn spindles.

The face of the indicator remains stationary in any desired position while the machine spindle rotates, thus leaving the operator with both hands free to accurately position the machine table by coordinated movement of the table positioning controls while observing the indicator hand reaction. (Indicator hand travel diminishes as location error is reduced to a point where the hand stands still, indicating coaxial alignment of the diameter being checked with the spindle axis)

By using the COAXIAL INDICATOR with the machine spindle running, exact operating conditions are more nearly simulated for the centering operation since the influence of power transmission, lubricant flow, bearing characteristics and torque are integrated into the indicator reading.

Coaxial Indicator Specifications

801 (Inch) – Premium Coaxial Indicator Specifications

Locating accuracy: To within .0002 in. of true center.
Graduation on Dial Face: .0005 in.
Length: 6 7/8 in.
Shank 3/8 dia. x 7/8 in. long
Weight 9 1/2 oz. net, 1 LB. 14 oz. shipping weight
Feeler ball 1/8 in. dia.
Measuring Range .250 axis offset
**Capacity Internal, 5/32 to 4 1/4 dia.- External, zero to 4 1/4 dia.
Speed It is recommended that operating speed not exceed 800 RPm approx.
Inital positioning: Within 7/16 dia. circle of true location.

*Capacity can be increased to 12″ diameter by use of accessory feelers

801 (Metric) – Premium Coaxial Indicator Specifications

Locating accuracy: To within .005 mm of true center.
Graduation on Dial Face: .01 mm
Length: 6 7/8 in.
Shank 10 mm dia. x 7/8 in. long
Weight 9 1/2 oz. net, 1 LB. 14 oz. shipping weight
Feeler ball 1/8 in. dia.
Measuring Range .250 axis offset
*Capacity Internal, 5/32 to 4 1/4 dia.- External, zero to 4 1/4 dia.
Speed It is recommended that operating speed not exceed 800 RPM approx.
Initial positioning: Within 7/16 dia. circle of true location.

*Capacity can be increased to 12″ diameter by use of accessory feelers

801-R (Refurbished) – Coaxial Indicator Specifications

Locating accuracy: To within .0002 in. of true center.
Graduation on Dial Face: .0005 in.
Length: 6 7/8 in.
Shank 3/8 dia. x 7/8 in. long
Weight 9 1/2 oz. net, 1 LB. 14 oz. shipping weight
Feeler ball 1/8 in. dia.
Measuring Range .250 axis offset
*Capacity Internal, 5/32 to 4 1/4 dia.- External, zero to 4 1/4 dia.
Speed It is recommended that operating speed not exceed 800 RPm approx.
Inital positioning: Within 7/16 dia. circle of true location.

*Capacity can be increased to 12″ diameter by use of accessory feelers

801-E (Economy Coaxial Indicator) Specifications Discontinued

Locating accuracy: To within .0010 in. of true center.
Graduation on Dial Face: .0010 in.
Length: 6 7/8 in.
Shank 3/8 dia. x 7/8 in. long
Weight 9 1/2 oz. net, 1 LB. 14 oz. shipping weight
Feeler ball 1/8 in. dia.
Measuring Range .250 axis offset
*Capacity Internal, 5/32 to 4 1/4 dia.- External, zero to 4 1/4 dia.
Speed It is recommended that operating speed not exceed 800 rpm approx.
Initial positioning: Within 7/16 dia. circle of true location.

*Capacity can be increased to 12″ diameter by use of accessory feelers

How to USe Coaxial Indicator - Instructions

The Blake COAXIAL (co-ax) indicator is primarily as a precision centering instrument for locating a work piece on a horizontal or vertical machine tool while the spindle rotates under power. Learn how to use a Blake coaxial indicator.

The Blake COAXIAL (co-ax) indicator is equally useful for positioning in the situation where it may be desirable to turn the spindle by hand the direction and distance of location error may be determined thus:

DIRECTION is indicated by the radial position of the feeler when the hand is at its high, or low, point of travel.

DISTANCE is indicated by the total travel of the indicator hand thru one full revolution of the machine spindle.

THE FEELERS

The STRAIGHT FEELER is used for inside diameters to approximately 4.25” inches.
The CURVED FEELER is used on outside diameters to approximately 4.25” inches and may be used on inside diameters over approximately 1 inch.

SET-UP and HOW TO USE A COAXIAL INDICATOR

Pre-position work to within the indicator travel range.
Attach restraining are to indicator and ensure there is a suitable stop in place. This will keep the indicator from rotating while spindle is operating so operator can easily and conveniently read the dial.
Place appropriate feeler in indicator rocker bracket and secure with thumb-screw. Position rocker bracket on rocker friction joint such that small indicator hand is centrally located on its graduation scale when feeler is in operational contact with work-piece.
Start machine spindle. CAUTION: Check for interference before turning on power. Speed should not exceed 700 to 800 rpm at any time.
Move machine table along axis of one positioning screw to a point where the indicator hand travel range has diminished to its lowest distance, thus, indicating that the center is centered in the spindle plane in the one direction.
Move the machine table along the axis of the other positioning screw until the indicator hand travel range diminishes to zero, thus indicating that the work-piece center is in axial alignment with the machine spindle.

NOTE: STEPS 5 & 6 will need to be repeated until needle movement reduces to ZERO movement. )The Blake CO-AX (co-axial) indicator is fitted and tested for operation of at least 58° F. Bearing/bushing stiffness may be present at lower temperatures.

DIAL GRADUTAION is divided such that each division represents .0005 inch of AXIS OFFSET (deviation from true location) when the feeler is tracing a diameter of two inches. (Varies slightly with feeler angle.) [Note: Dial graduation is different for 801-E Economy model.]

CARE

Under normal conditions The Blake COAXIAL (co-ax) indicator should require no servicing and only the consideration in use and handling due any precision instrument. Allowance for familiarization should be made when it is first being used.

Additional NOTES

The Blake COAXIAL INDICATOR is a centering device. It requires a reading of both sides of the bore or boss in each axis, to arrive at the center. Its sole function is to find center. It is NEVER to be used as a measuring instrument.

You cannot certify the COAXIAL INDICATOR on a surface plate. It must be put in a spindle of a machine that it would normally be used in and indicate a precision ring or plug. Then remove it and use a .0001 indicator to check that your are on center.

The CO-AX INDICATOR is made to be used under power. When checking the CO-AX position with a test indicator, the spindle should be rotated manually for both indicators due to the fact that spindle torque under power on some machines will give a different reading for center.

COAXIAL INDICATOR

Blake Coaxial Indicator