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42 Tooth Change Gear?
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Does anyone know what a 42 tooth change gear would be used for on a 9” lathe? I don’t see that tooth count on either the 9B/C change gear chart or in the chart for metric threading. I have one that came with a 9A I recently purchased and I believe it’s from South Bend based on the part number stamped into it. Searching the web has turned up nothing. Thanks!
R/ Keith  |
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Davis Johnson
You need it to get 27tpi for 1/8 npt for light sockets. On 4/5/22 11:15, Keith Douglass wrote:
Does anyone know what a 42 tooth change gear would be used for on a 9” lathe? I don’t see that tooth count on either the 9B/C change gear chart or in the chart for metric threading. I have one that came with a 9A I recently purchased and I believe it’s from South Bend based on the part number stamped into it. Searching the web has turned up nothing. Thanks! |
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G K
No 42 in the parts list I have for my SB9c from 1957.
On Tuesday, April 5, 2022, 10:15:22 AM CDT, Keith Douglass <keith_douglass@...> wrote:
Does anyone know what a 42 tooth change gear would be used for on a 9” lathe? I don’t see that tooth count on either the 9B/C change gear chart or in the chart for metric threading. I have one that came with a 9A I recently purchased and I believe it’s from South Bend based on the part number stamped into it. Searching the web has turned up nothing. Thanks! R/ Keith 
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Thanks Davis! That sounded familiar, so I checked the documentation that came with the lathe and found exactly what you referenced. I appreciate the help!
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Here’s the form: |
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Ray De Jong
Als, its a key gear used in 'fudging Metric threading on the South Bend 9 and 10K. There is a thread on this forum if you are interested. I have cut many Metric threads in this manner and they are quite acceptable for general use if you dont worry about being out of pitch a bit. some are as close as .003" in 5 inches.
On Tuesday, April 5, 2022, 10:11:07 AM PDT, Keith Douglass <keith_douglass@...> wrote:
Here’s the form: |
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