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```How to Select Gage Blocks for Use
in Combinations```
```Gage block selection is a process that starts by examining the last or smallest decimal place
of the desired combination and eliminating it while subtracting it from the remaining length of
the desired combination as you proceed.  The process is repeated for each remaining decimal
place until the total combination has been selected.

As an example:  A desired combination is to have a length 3.9762 in.

1)   Look over the available blocks in the set for a block that has a "2" in the fourth decimal
place.   Most likely it will be a .1002" block.  (Some sets will have a .0502" block.)

2)  Subtract the selected block from the total length of the desired combination to eliminate the
last decimal place.```
 `81 piece set` `36 piece set` `.050 series set` ```3.9762 - .1002 3.876x``` ```3.9762 - .1002 3.876x``` ```3.9762 - .0502 3.926x```
```3)  Now examine the next smallest decimal place.  (In this example, it ends with a "6".)  Find
the blocks in the set that have a "6" in the third decimal place:```
 `81 piece set` `36 piece set` `.050 series set` ```.106 .116 .126 .136 .146``` ```.106 .``` ```.056 .```
```    If you are using an 81 piece set, choose the block that will leave either a "0" or a "5" in the
second decimal place when you subtract this block from the result in Step 2.    (In this
example, it would be the .126" block.)

4)  Subtract the selected block from the result in Step 2.```
```5a)   If you are using an 81 piece set, the selection is about done.  It can be seen from the
remainder in Step 4 above that a .750 and an 3.000 inch block will complete the
combination.  Proceed to Step 10.

5b)  If you are using a 36 piece set or a .050 series set, you must continue to examine the
smallest remaining decimal place of the result.   Choose the block in the set that will
eliminate the last non-zero decimal place.  (In this example, the last decimal place
contains a "7".)```
 `36 piece set` `.050 series set` `Choose: .170 block` `Choose: .070 block`
`6)  Subtract the chosen block from the remaining result in Step 4.`
 `36 piece set` `.050 series set` ```3.770 - .170 3.6x ``` ```3.870 - .070 3.8x ```
```7)  Examine the last remaining non-zero decimal point.  Smaller sets do not usually have a .600
or .800 inch blocks.   These sets usually contain these sizes:

.100
.200
.300
.400  (May or may not be included in the set)
.500```
```8)  Choose blocks from the series of blocks listed in Step 7 above that will add up to the
remaining decimal place calculated in Step 6.  In this example, the choices would probably
be:```
 `36 piece set` `.050 series set` ```Choose: .100 block .500 block``` ```Choose: .300 block .500 block```
```     Note:  Other choices could be made as shown below.  But, it is recommended to keep the
number of blocks in the combination as small as possible.  ```
 `36 piece set` `.050 series set` ```Alternate choice: (Not recommended)``` ```Choose: .100 block .200 block .300 block``` ```Choose: .100 block .200 block .500 block```
```9)  Now that all that remains is the whole number of inches in the combination.  (3 inches in the
example.)  If the set has a single block of the desired length, choose it.  Otherwise, a
combination of blocks will have to be selected.  In our example, it is more likely that the
3-inch size will have to be built up from 1-inch and 2-inch blocks. ```
 `36 piece set` `.050 series set` ```Choose: 1.000 block and 2.000 block``` ```Choose: 1.000 block and 2.000 block```
`10)  Double check the combinations by adding together all the selected blocks.`
 `81 piece set ` `36 piece set` `.050 series set` ```.1002 .126 .750 3.000 3.9762 ``` ```.1002 .106 .170 .100 .500 1.000 2.000 3.9762 ``` ```.0502 .056 .070 .300 .500 1.000 2.000 3.9762```

```Metric gage block selection is performed in the same manner.  Always start with the last or
smallest decimal place and eliminate it with your choice of blocks while you subtract it from
the remaining length of the combination as you proceed.  Repeat this procedure until the total
combination has been selected.

Example:  Desired combination length of 150.932mm

1)  Examine the blocks in the set that have a "2" in the third or lowest decimal point.```
 `112 or 88 ` `piece sets` `45 pie` `ce sets` `1mm base set` `2mm base set` `1mm base set` `2mm base set` `1.002 block ` `2.002 block ` `1.002 block ` `2.002 block `
`Choose: `
`2)  Subtract the chosen block from the size of the desired combination.`
 `112 or 88 ` `piece sets` `45 pie` `ce sets` `1mm base set` `2mm base set` `1mm base set` `2mm base set` ```150.932 - 1.002 149.93x ``` ```150.932 - 2.002 148.93x ``` ```150.932 - 1.002 149.93x ``` ```150.932 - 2.002 148.93x ```
```3)  Choose a block to eliminate the next smallest non-zero decimal point.  If using an 88 or 112
piece set, choose a block that will leave either a "0" or a "5" in this decimal place.```
`Choose: `
 `1.43 block` `2.43 block` `1.03 block` `2.03 block`
`4)  Subtract the chosen block from the remainder in step 2.`
 `112 or 88 ` `piece sets` `45 pie` `ce sets` `1mm base set` `2mm base set` `1mm base set` `2mm base set` ```148.93 - 1.43 148.5x ``` ```148.93 - 2.43 146.5x ``` ```149.93 - 1.03 148.9x ``` ```148.93 - 2.03 146.9x ```
```5)  Choose block to eliminate the next smallest non-zero decimal point.  If using an 88 or 112
piece set, choose a block that will eliminate the first whole millimeter decimal place as
well.```
`Choose: `
 `8.5 block` `6.5 block` `1.9 block` `2.9 block`
`6)  Subtract the chosen block from the remainder in step 4.`
 `112 or 88 ` `piece sets` `45 pie` `ce sets` `1mm base set` `2mm base set` `1mm base set` `2mm base set` ```148.5 - 8.5 140.x ``` ```146.5 - 6.5 140.x ``` ```148.9 - 1.9 147.x ``` ```146.9 - 2.9 144.x ```
`7) Choose blocks to equal the whole millimeters left in the combination.`
 ` ` `45 pie` `ce sets` `112 piece set` `88 piece set` `1mm base set` `2mm base set` ``` 100.0 25.0 15.0``` ```100.0 40.0 ``` ```90.0 50.0 7.0``` ```90.0 50.0 4.0 ```
`8) Verify that the combination of chosen blocks equals the desired length. `
 `112 or 88 ` `piece sets` `45 pie` `ce sets` `1mm base set` `2mm base set` `1mm base set` `2mm base set` ``` 1.002 1.43 8.5 100.0 25.0 15.0 150.932``` ``` 2.002 2.43 6.5 100.0 40.0 150.932 ``` ``` 1.002 1.43 1.9 90.0 50.0 7.0 150.932``` ``` 2.002 2.03 2.9 100.0 25.0 15.0 150.932 ```
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©2018, Webber Gage Division, The L. S. Starrett Co, Westlake, Ohio , 44145
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