Tap wrenches

Value-Rite tap wrench, straight handle, style for 0-V2" (1.6-12.5mm) taps McMaster- Carr 25605A75... 

Tapping is then started using the taper or first tap securely held in a tap wrench. The long lead enables it to follow the drilled hole and keep square. The tap is rotated, applying downward pressure until cutting starts. No further pressure is required, since the tap will then screw itself into the hole. The tap should be turned back quite often, to help clear chips from the flutes. 

If the hole drilled on the lathe requires threading, this can be carried out by hand, using hand taps. Having drilled a hole of the correct tapping size (see Chapter 2), it is essential that the tap is started parallel to the workpiece axis. The first step is to isolate the machine. This is a hand operation and power rotation of the machine is not required. Hold a taper or first tap in a tap wrench and offer it into the start of the hole. 

Treatment 2 Open the compression fitting at the top of the outlet check valve with a slow pump flow until solvent leaks around the fitting. Tap the side of the check valve with a small wrench until small air bubbles come out with the liquid. Reseat the compression fitting. 

Figure 6.9. Two polymers of 2-methyl-l,3-butadiene [isoprene, CH2=C(CH3)CH=CH2]. The first, all cw-l,4-polyisoprene, is close to natural rubber (wrenched from the naturally occurring latex obtained by tapping Hevea brasiliensis, the rubber tree ) and can be obtained...

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