Lubricants
The use of a suitable lubricant is essential with most tapping and reaming operations. Recommended lubricants for some common materials are as follows:
- Carbon steel
- Petroleum-based or synthetic cutting oil.
- Alloy steel
- Petroleum-based cutting oil mixed with a small amount (approximately 10%) of kerosene or mineral spirits. This mixture is also suitable for use with stainless steel.
- Cast iron
- No lubricant. An air blast should be used to clear chips.
- Aluminum
- Kerosene or mineral spirits mixed with a small amount (15–25%) of petroleum-based cutting oil. WD-40 and 3-In-One Oil are acceptable substitutes in some cases.
- Brass
- Kerosene or mineral spirits.
- Bronze
- Kerosene or mineral spirits mixed with a small amount (10–15%) of petroleum-based cutting oil.
In power tapping and reaming operations, the tool and workpiece should be continuously flooded with lubricant.
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