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In a countersinking operation, once the tool reaches the proper depth, what should the operator do to ensure hole concentricity and a good surface finish?
1. Back the tool in and out of the bottom of the hole several times.
2. Increase the spindle speed one and a half times the normal rate.
3. Turn off the spindle to let the hole walls cool before continuing.
4. Let the tool run a few seconds before backing out of the hole.

Respuesta :

Martebi

There are different aspect of drilling operations. What the operator have to do to ensure hole concentricity and a good surface finish is to Increase the spindle speed one and a half times the normal rate.

Countersinking is often used to produce a conical hole linking the angled shape on the bottom side of a flat-head screw.

  • Research has shown that  surface roughness is often affected by the spindle speed and feed rate.

  • Note that surface roughness often increases with increased in feed rate and is known also to be higher at lower speeds and vice versa..

There is a required spindle speed used for countersinking operation . The lead out rule is of 1/3 the speed of a drill of the same size often work for almost all countersinking and counterboring operations.

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