Southbend SB1001 owner manual Setting Threading Controls, Setting Thread Pitch of 12 TPI

Model SB1001 8K™ Lathe O P E R A T I O N For Machines Mfg. Since 8/11

b.Install 48T pulleys on the upper right (B pulley shaft) and the lower right pulley shaft.

c.Install the 15T pulley on the B pulley shaft (upper right).

d.Install the 20T pulley on the C pulley shaft, then place the 120XL timing belt between this pulley and the 48T pulley on the lower right.

e.Place the 140XL timing belt on the upper left 16T and 48T pulley on the B pulley shaft.

f.Install the 48T pulley on the C pulley shaft, then place the 120XL timing belt between this pulley and the 15T on the B pulley shaft.

7.Apply upward and forward pressure to the upper right and middle right pulleys (see Figure 58) as you re-tighten the shaft hex nuts you loosened in Step 3.

Setting Threading Controls

Using the controls on the lathe, follow along with the example below to better understand how to set up the lathe for the desired threading setup.

Tools Needed	Qty
Wrench 13mm	.......................................................2

Setting Thread Pitch of 12 TPI

1.DISCONNECT LATHE FROM POWER!

2.Open the end cover.

3.Loosen the pulley shaft hex nuts and tensioning thumb screw shown in Figure 59.

Tensioning Thumb Screw

Shaft

Hex Nuts

Apply Pressure

Thumb Screw

Figure 59. Pulley shaft hex nuts and tensioning thumb

screw.

Apply

Pressure

Figure 58. Locations to apply pressure on pulleys.

8.Continue to apply pressure on the pulleys as you re-tighten the thumb screw to tension the timing belts.

Important: Leave a slight amount of slack in the timing belts when securing the pulleys. Adjusting the tension too tightly will cause excessive wear and stretching. Adjusting the tension too loosely could cause the belt to slip during operation.

9.Close the end cover before re-connecting the lathe to power.

4.Position the pulley shafts so that the timing belts are loose.

5.Locate the column in the inch thread chart for 12 TPI (see Figure 60).

Pulley &						12 TPI
Belt						Thread
Identification						Pitch
	in.	10	11	12	13	14	16	18	19	20
	A	48	24	48	18	48	48	48	48	48
	B	48	32	48	24	48	48	32	32	24
	D	15	22	18	26	21	24	18	19	15
	E	140	120	140	120	140	140	140	140	140
	F	140	120	140	140	140	140	120	120	120

Figure 60. Thread chart example for 12 TPI.

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