Term
| What is friction? What kind of friction is the most severe? |
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Definition
| Friction is the resistance of motion between two mating parts. Sliding friction is the most severe. |
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Term
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Definition
| It is the measurement of resistance of a fluid to flow. |
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Term
| What is the difference between an anti friction bearing and a plain bearing? |
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Definition
| Anti Friction bearings use rolling motion to support a load and reduce friction. Anti-friction bearings produce less friction than plain bearings. |
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Term
| What can happen if you over oil an anti-friction bearing? |
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Definition
| Too much oil can cause it to begin to churn and result in overheating. |
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Term
| What is Sliding Friction? |
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Definition
| It is the resistance one surface has as it slides over another. |
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Term
| What are the three types of cutting fluids? |
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Definition
| Cutting Oil, Soluble/Emulsified and Chemical/Synthetic. |
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Term
| What is Rolling Friction? |
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Definition
| It is the resistance one surface meets as it rolls over another. |
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Term
| What is the purpose of lubrication? |
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Definition
| The purpose of lubrication is to prevent wear and corrosion. |
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Term
| Do higher spindle speeds require low or high viscosity oil? |
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Definition
| The higher the rpm the lower the viscosity required and vice versa. |
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Term
| The lowest temperature that a fluid will flow is known as the... |
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Definition
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Term
| What is critical in the splash lubrication system? |
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Definition
| The oil must be maintained at the proper level to distribute oil properly and prevent frothing. |
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Term
| In a wick feed system the wick doubles as an _____. |
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Definition
| The wick doubles as an oil filter in a wick feed system. |
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Term
| What is a drip feed system? |
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Definition
| It is a lubrication system that has the oil reserve flow using gravity and it is controlled with a needle valve that can be throttled to change the flow rate. |
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Term
| How does a ring/slinger oiling system work? |
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Definition
| It oils by having a ring spin loosely around a shaft and the bottom edge of the ring sits inside oil. When the oiled part of the ring reaches the top it deposits some of the collected oil on the shaft. |
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Term
| How does a enclosed circulating/recirculating system work? What are the advantages? |
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Definition
| It pumps oil through its tubing forcing it using pressure into a bearing. The oil enters the bearing through a hole and spreads all over the bearing through a series of oil grooves. It's effective as it ensures a constant flow of oil and uses pressure to deliver the oil instead of metal to metal contact thus avoiding wear. |
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Term
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Definition
| It is when oil is what is prevent contact between bearing surfaces when they are brought up to rpm. |
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Term
| What is the purpose of cutting fluids? |
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Definition
| To reduce temperature, lubricate and increase chip flow. |
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Term
| When mixing oil and water what one should be added into the other? |
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Definition
| The oil should be added into the water. |
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Term
| What are some characteristics of a good cutting fluid? |
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Definition
1) They must cool the workpiece.
2) They must lubricate.
3) They must resist corrosion.
4) They must remain stable.
5) They must resist becoming rancid.
6) They must be non-toxic.
7) They should be transparent.
8) They should have relatively low viscosity.
9) They must be non-flammable. |
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Term
| What is the application of Cutting Oils? |
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Definition
| They are for low speed applications such as tapping, reaming or broaching. |
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Term
| What is the application of Emulsifiable(soluble) oils? |
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Definition
| They are used for high-speed applications such as lathe and milling operations. |
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Term
| What is the best way to introduce coolant when drilling and reaming? |
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Definition
| Directly to the cutting edge through the use of holow tooling or oil hole drills. |
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Term
| When would you use kerosene as a cutting fluid? |
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Definition
| When you are drilling/reaming aluminum you would use kerosene. |
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