No. 1 – Combination Micrometer Gauge
Image From Catalog No. 18
In the above illustration the micrometer body and three plain wires are the same as in our Inside Micrometer Gauge, but the fourth wire is graduated as shown, in $4” divisions for use with the depth gauge attachments.” It measures standard lengths as a depth gauge, but only allowances or differences as an inside caliper.
To Use The Depth Gauge Correctly
First bring the micrometer to zero. then holding the base upon work to be measured,push the wire to bottom and clamp there with the chuck, then measure the wire to next line by turning the micrometer back till line on wire is just split across base,this reading must, of course, be added to length of wire from this line to end. It is best to consider the spaces on wire in decimals, that is, 1/4”=.250″, 1/2”=.500″, 3/4”=.750″, so that the reading on micrometer may be added without confusion.
The gauge may be set to any desired length by nrst setting the micrometer to the fraction over the even graduations on wire thus: should you wish to set the tool to 9-16″, first set the micrometer to 1-16’’ or .0625 then set the wire to the 1-2″ line and when the micrometer is brought back to zero the desired length is obtained.
This is a very convenient way of using the tool when cutting down a recess when itis desired to measure the work quite often in order to know how near to depth it is for,when the wire is screwed down the direct reading on micrometer is the amount that remains to come out (which is just what should be known) and then when the depth is reached the micrometer will stand at zero which helps to avoid all possible mistake.
We recommend this way of using the tool’ when measurements are required quickly and great fineness is not required, as in the case cited, but when accuracy is required. the gauge should be used by sliding the wire down and measuring it with the micrometer as previously described.
Image From Catalog No. 18