INSTALLATION MANUAL OF TML BTM BOLT STRAIN GAUGES
Contents
1. the bolt gauge Insert the gauge into the hole to put the bent part of gauge leads on the bolt head The gauge should be placed at the center of hole Take care not to bend or place the gauge eccentrically or at the bottom When inserting the gauge take care not to develop air bubbles Allow the adhesive to cure for 12 hours at room temperature In this state the adhesive does not harden Image Drawing Good Eccentric At the bottom Fig 7 Bad Sensitivity failure is cased E Hot Cur ing Cure with the bolt standing in electric furnace for 3 hours at 140 C Temperature should be raised after placing the bolt in the furnace Quick temperature elevation should be avoided otherwise air bubbles or crack will occur Connection After cooling the bolt wire the gauge to instrument for measurement lt u gt Tokyo Sokki Kenkyujo Co Ltd 8 2 Minami ohi 6 chome Shinagawa ku Tokyo 140 8560 Japan TEL 03 3763 5611 FAX 03 3763 6128 E mail sales tokyosokki co jp2. INSTALLATION MANUAL OF TML BTM BOLT STRAIN GAUGES n BTM Bolt Strain Gauges E B In case that strain gauges can not be bonded on the shaft surface of a bolt the BTM gauge is embedded into a hole drilled at the center of bolt head with A 2 adhesive to measure the axial strain of the bolt on tightening By calibrating the gauge embedded into the bolt you can find accurate tightening axial force of the bolt Specifications G i 3 Center l Resistance Type om ee re e lt BTM 1CcC 07 56 f 14 18 38_ BTM 6c 6 10 120 17 5 7 Hole Dia mm 120 20 Gauge lead Polyurethane covered copper wire 0 14 80mm long Applicable bolt Sectional area loss of bolt due to drilling should be within 5 Operating temperature 10 80 r Strain limit 5000X107 a b approx 80mm Gauge center Drilling Bolt Hole diameter BT M 1C 1 6mm BIM 6C 2 0mm bo Depth When the gauge is embedded A clearance between the end of the gauge and lt the bottom of hole should be 3 5mm Ex In case the gauge center is 30mm from the top of the bolt head BIM 1C a 1 8mm 30 1 8 3 5 34 8 36 8mm BIM 6C a 5mm 30 5 3 5 38 40mm Fig 2 Cleaning of Inner Hole Cleaning with solvent Acetone etc Wash out drilling oil and dust with solvent through a syringe Wiping off Pe ae o Remove the remainder thoroughly by a solvent dampened tissue which is rolled on a d
3. rill bit Repeat till the tissue is not contaminated Removal of solvent a 2 Remove the remaining solvent in the inner hole with a clean tissue etc If drilling oil dust and solvent remain in the hole curing failure of adhesive may occur Also clean the outside of the bolt such as head and axle Immediately after washing embed the gauge to avoid contamination by a film of oxide and soil TML manu GO62E EJ Enbedment Position Depth D Pibednent should be made at a position where variation in the section is less Embedment into the thread portion bolt head or the bottom of a hole is badly influenced by the form of the section Image drawing i Good Thread Bolt head Bottom of hole Bad Sensitivity failure may be caused Determine an embedment position precisely and measure the embedment length Mark the gauge leads according to the length Bend the gauge leads rectangularly at the mark without injuring the insulation material Bend gauge leads rectangularly Fig 4 Fl Mixing Adhesive D Mixing ratio Drug A Drug B 10 1 by weight Use the proper amount Mixing Mix well Heating Warm the mixed adhesive Be heat gun etc to remove air bubbles and reduce the viscosity The mixed adhesive can be used for 2 3 hours For detail refer to the installation manual of the A 2 adhesive g Preliminary heating Heat the adhesive and bolt at 50 60 C for 30 minute
4. s Adhesive Keep fluid by reducing th viscosity Removing bubble when mixing Bolt Keep the same temperature as the adhesive to maintain the fluidity of the adhesive Continues over leaf EJ Pouring of Mixed Adhesive With use of syringe Enter the mixed adhesive into the syringe Insert the syringe to reach the bottom of the drilled hole Apply the mixed adhesive into the hole from the bottom fully Take care not to produce air bubbles in the hole by adjusting the pulling up speed of the syringe and pouring speed When drawing up the syringe from the adhesive take care not to make air bubbles remain in the hole A specific needle of 1 8mm dia is available for embedding BIM 6C not for BIM 1C Insert l Air bubbles i With use of vacuum pump Make a fence using vinyl tape around bolt head for adhesive pond Pour the mixed adhesive For example proper quantity should be 4 to 5 grams for a drilled hole of 2 0mm in diameter and 50mm in depth Put bolt into desiccator and create a vacuum for 15 to 20 minutes to get a level at 1 to 10Pa The time to create vacuum depends upon desiccator volume and pump but vacuum work must be completed within 30 minutes in respect of pot life After completion remove the fence and take off an excess adhesive Poring A 2 Vacuum desiccator Vacuum pump Fill Complete Making fence 1 Fig 6 E Inserting Gauge Apply the mixed adhesive to
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