Smithy GN1300 - Manual (Page 71)

Section four and five of the chart list the metric thread pitches when using the
following gear set-up:
Section 4 Section 5
A=33 A=66
B=80 B=64
C=63 C=63
D=60 D=60
Changing gears will be covered in the Threading chapter.
Sample Settings
Here are a couple of examples to illustrate the speed/feed chart.
Example 1
Settings to thread 10 threads per inch.
In section 1, locate number 10. Follow the row over to the column next to the
meshing gears which is the number 4. Follow the column up to the Roman
Numerals which is Roman Numeral I. To cut this thread you will need:
1. Selector lever (1-7) in position 4
2. Selector lever (I-III) in position I
3. 30 tooth gear in position A
4. 66 tooth gear in position B
5. 60 tooth gear in position C
6. 60 tooth gear in position D.
7. Set the Inch/Metric selector, found in the pulley box, to Inch.
Example 2
Setting to move the carriage assembly 0.0069 in per spindle
revolution.
Locate the rate 0.159 in section 2. Follow the row over to the column next to
the diagram of the meshing gears which is 5. Follow the column up to the
Roman Numerals which is II. To feed your carriage at this rate you will need to:
1. Selector lever (1-7) in position 5
2. selector lever (I-III) in position II
3. 30 tooth gear in position A
4. 66 tooth gear in position B
5. 60 tooth gear in position C
6. 60 tooth gear in position D.
7. The Inch/Metric selector found in the gear box would need to be set to Inch.
These example settings will aid you in correctly setting up your machine for
powerfeeding which will be covered in the next section of this manual.
Granite 1300 Series Operator’s Manual
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