Обший каталог Yamawa 2016 - 2017 - страница 846

The mechanism for a tap to cut oversize on an internal thread 24.

1. Run out, misalignment and tap cutting in non perpendicular to holes Over-cutting at radial direction

and checked when idle The use of adjustable running. holder with floating features will reduce this Lateral force problem.

Solutions

misalignment

Run out

Excessive cutting in radial direction causes oversized internal threads. Since tapping proceeds along bored hole, in the depth of hole, oversize cutting is minimized, that is, oversize cutting in the beginning of the hole and normal cutting in the depth of the hole.

Excessive-cutting in the radial direction Normal internal threads

Not Go gauge

Over sized Normal internal threads Not Go

Not Go gauge internal gauge internal threads

at the beginning threads of the bore

2. Using a tap not suitable for the operation or a tap with dull Over-cutting caused by galling and excess cutting

cutting edge may cause galling and result in over-cutting.

Using an incorrect tap for a specific workpiece material Tapping process with dull edge can cause problems

Wear Welding Chipping

Select the correct Tap Flank Straight fluted tap Spiral fluted tap Spiral pointed tap

Roll tap Parallel

Wear wear Welding Chipping

Selection of correct taps suitable for material being tapped is strongly recommended. Solution: Proper use of cutting oil, confirmation of a constant for tool life

thread

Over-cutting caused by galling and excess feeding

Not Go gauge