$274.99 Buy It Now or Best Offer
free,30-Day Returns
Seller Store callab_gte_net
(1155) 100.0%,
Location: Bridgewater, Connecticut
Ships to: US,
Item: 196633052971
All returns accepted:ReturnsNotAccepted
MPN:BXT MODEL 1 & T-225
Country/Region of Manufacture:United States
Normal 0 false false false EN-US X-NONE X-NONE NO OVERSEAS/INTERNATIONAL BIDS!!!! Sale is intended for the U.S.A only. NOTE: Please contact me for a shipping rate quote if you live in Alaska or Hawaii. I retired a number of years ago after spending the majority of my career working in testing and calibration labs and relocated to the northeast. I wrote calibration procedures and was the calibration procedure release focal for the largest aerospace manufacture in the U.S.A. My main area of expertise was in dimensional metrology. I also participated in writing many ASME B89 dimensional metrology standards. I performed a “functional test” only of the amplifier. 1.) Depressing the gaging head, I was able to deflect the meter moment from left to right of full scale. (NOTE: For purposes of the photos, I simply used the reversing switch on the gaging head.) 2.) Using a Boeckeler 20 millionths micrometer head, I was able to perform a “Amplifier Range Calibration” utilizing the “CAL Adjustment” potentiometer on the amplifier on the +/-.002″ range per the instruction manual. NOTE: Normally the scale accuracies on electronic gaging amplifiers are closely correlated so that when you change from one range to another the accuracy will remain within acceptable limits. I decided however to be sure and performed additional checks on the +/-.010” and +/-.001” scales using the Boeckeler micrometer head. NOTE: I do not have the necessary N.I.S.T. traceable standards to perform a calibration of the BXT Model1 amplifier and T-225 gaging head. Due to its age, and the nature of vintage test equipment it is being sold “AS-IS”. All SALES ARE FINAL. NO RETURNS. This listing is for the following: (1) Sheffield BXT Model 1 gaging amplifier (1) Sheffield/Bendix T-225 Gage Head (1) Sheffield BXT Gaging Amplifier Models 1 and 2 Instruction Manual NOTE: Sheffield Measurement was the successor Bendix Corporation. NOTE: Precision Devices, Inc acquired Sheffield and now supports this legacy product line with their next generation gage heads and amplifiers. The features noted below are taken from Cleveland Instrument, Bendix, Sheffield, and Precision Devices sales literature and may not reflect the actual performance and options of the item for sale and is provided as an overview and for informational purposes only. I will not be held responsible for its accuracy and/or content. Typical applications include: o Surface plate work o Runout o Height gage indicator o Size variation o Setup verification INDI-AC Comparators BXT Amplifiers The completely solid state, highly stable dimensional gaging amplifier offers the operator a choice of four metric and inch-system ranges. Meter scales are mirror-backed to prevent parallax error. A dual range zero centering control gives the operator a convenient and precise means of establishing initial reference without having to make critical adjustments of gage head position. Inspectors will appreciate the fact that all ranges, metric and inch, are calibrated simultaneously; there is no need to calibrate separate ranges independently, and no need to acquire gage blocks of special sizes to calibrate the amplifier correctly. An output receptacle provides an analog DC voltage that can be used to drive a recorder, digital voltmeter, or other peripheral equipment. Amplification Range Per Meter Division 10,000X ±0.005 mm ±0.0002″ 0.2 mm 10 min 2,000X ±0.025 mm ±0.001″ 1.0 mm 50 min 1,000X ±0.050 mm ±0.002″ 2.0 mm 100 min 200X ±0.250 mm ±0.010″ 20.0 mm 500 min Input: single T-225 lever type gage head or single T-304 cartridge gage head Display: 4″ (100mm) analog meter, ±20 division, center zero, mirror-backed scales Transducer excitation: 4kHz Output Voltage: to ±2.5 volts DC Dimensions: 7.8″ (198mm) wide, 6.0″ (153mm) high, 4.8 (121mm) deep Power requirement: 115 volts, 50/60Hz Standard; 230 volts, 50/60Hz optional AMPLIFIERS Standard Sheffield amplifiers have 4 continuous linear scales each side of a common zero, with 4 ranges (magnifications). The scales are used interchangeably at will, simply by turning the range selector knob on the panel. All scales always give the same reading for any measurement within their range. The meter gives instantaneous readings, without overshoot; and the scale divisions are widely spaced for easy reading. Standard amplifiers provide sensitivities of 0.0005” to 0.00001” per 1/10” movement of the meter hand. This gives the operator the feeling of working in inches instead of “tenths” or millionths. For example, with a sensitivity of 0.00001” per scale division, a difference in work size of 0.0001” moves the meter hand a distance of 1” along the scale. Such controls as quadrature adjustment, separate calibration for each range, and linearity adjustment are necessary with other electronic gages, to compensate for lack of precision or good basic design. With Cleveland/Bendix amplifiers, the turn of a single screw is all that’s needed to set the calibration adjustment for all scales. Another screw adjustment takes care of zero tracking. It is customary to check these performance characteristics when first using any electronic gage; and with Bendix gages, there are no further checks or adjustments. The transistor amplifier requires no warm-up. Gage Heads are INTERCHANGEABLE All Sheffield/Bendix gage heads of the same model can be used interchangeably with the same Sheffield/Bendix amplifier, with little or changing of the calibration adjustment. Accordingly- • In case of gage head damage, a spare gage head will give the same reading as the one it’s replacing. Furthermore, with slight readjustment of the amplifier for zero-to-full scale calibration, all Indi-Ac, Par-Ac and cartridge gage heads can be used with the same amplifier. GAGE HEADS The Indi-Ac gage heads are for use (1) on a portable stand, for all-around height-gage and comparator work and checking machine setups; (2) on gaging fixtures used in gage rooms, inspection and production departments. They provide readings in increments as small as 0.000,002” per scale division, depending upon the amplifier used. Their frictionless operation, free from backlash, wear and sticking, assures measurements repeatable within 0.000,001” or less with any amplifier. These gage heads have a replaceable contact tip that permits reaching into small ID’s, slots and other openings to a depth of ¾”. A wide selection of tips provides for gaging hard-to-reach surfaces. Other features include the following: Contact Tip Prevents Damage. All Indi-Ac contact tips are of exclusive “Protector Tip” design – attached to the gage head by a friction-loaded ball joint that slips when a force greater than 12 oz. is applied. A 90° bend at the mounting end lets the tip slip even when it is bumped head-on. With this patented construction, impact or jamming from any direction merely deflects the contact tip and cannot damage the gaging mechanism. Fine Adjustment Speeds Setup. The MB-1F mounting back, regularly furnished, is of spring construction, permitting the gage head to pivot in the plane of movement of the contact tip. The position of the head is governed by a lapped fine pitch screw, turned by the fine-adjustment knob. During setup, this mechanism quickly and smoothly brings the head to a close-to-zero reading. Contact Force Reversing Lever. This lever provides for measuring on both top and bottom surfaces with the gage head right-side-up. Friction-Locked Angular Adjustment. This assembly permits the gage head to be swung up or down on its support, without clamping or unclamping the connection. The gage head is attached to its support by a screw, with a spring washer between to provide the desired amount of friction. ADDITIONAL SPECIFICATIONS: Measurement Range: ±0.010” maximum, depending on amplifier and range selected. Fine Adjustment Range: .030” Contact Tip: Straight, with 1/8” tungsten carbide ball.* *Other contact tips (i.e. CP-320 and CP-321 series, etc.) are available, see Precision Devices, Inc. The “amplifier and gage head” will only be shipped by U.S.P.S. priority mail within the U.S.A. I will not ship to post office boxes, unconfirmed addresses or third parties. I reserve the right to close the auction early in order to permit a local sale.
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