Threading Controls

16-Speed Gearhead Lathe

O P E R A T I O N

For Machines Mfg. Since 3/11

The following subsections describe how to use the threading controls and charts on this lathe. If you are unfamiliar with the process of cutting threads on a lathe, we strongly recommend that you read books, review industry trade magazines, or get formal training before doing any threading projects.

Setting Threading Controls

The threading charts on the headstock face display the settings for metric, inch, modular, and diametral threading.

For inch or metric threads, use the standard end gear configuration. For modular or diametral threads, use the alternate configuration

Use the controls on the lathe and follow along with the example below to better understand how to set up the lathe for the desired threading operation.

Example: Metric Thread Width of 2.5mm

1.Make sure the end gears are in the standard configuration, which is used for all metric threading (refer to End Gears on Page 56 for detailed instructions).

2.Locate the line in the metric thread chart that lists the setting for 2.5mm threads, as illustrated in Figure 86.

3.The configuration string of characters to the right of the selected thread pitch (LCR3Y) displays the positions to set the threading controls for a metric thread width of 2.5mm.

Note: In the next step, use the chuck key to rock the spindle back-and-forth to help mesh the gears as you make adjustments.

4.Position the controls as directed by the configuration string (LCR3Y) as follows:

a)Move the feed range lever to the low (L) position.

b)Point the left gearbox lever to the "C".

c)Point the middle gearbox lever to the "R".

d)Position the bottom gearbox lever in the "3" slot.

e)Point the right gearbox lever to "Y".

The lathe is now set up to cut a metric thread width of 2.5mm.

.2	LCT12	2.0	LCR1Y
.225	LCT2Z	2.5	LCR3Y
.25	LTC3Z	3.0	LCR6Y
.3	LTC6Z	3.5	LCR8Y
.35	LTC8Z	4.0	HCR3Z
.4	LSC1Z	4.5	HCS2Y
.45	LSC2Z	5.0	HCS37

Figure 86. Metric thread chart with a width of 2.5 mm

highlighted.

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SB1053F Turn-X specifications

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Southbend SB1053F Turn-X Setting Threading Controls, Example Metric Thread Width of 2.5mm

Models: SB1053F Turn-X