27 Questions
What is the purpose of tail support in a machining setup?
To increase rigidity
Why is tail support important when there is a lot of stick out from the chuck?
To prevent the part from moving and to increase rigidity
What is the general rule of thumb for the maximum stick out from the chuck?
No more than two to three times the diameter of the material
What happens to the rigidity of the part when a little bit of support is added to the end?
It becomes really quite rigid
What is the purpose of a tail support in a lathe?
To support the workpiece and reduce deflection during machining.
How does the tail support work in a lathe?
The tail support consists of a tapered bore in the tailstock that accepts different types of centers, such as dead centers and ball bearing live centers. These centers are inserted into the taper and hold the workpiece in place.
What are the two types of centers mentioned that can be used for tail support?
Dead center and ball bearing live center.
How are the centers installed in the tailstock?
The centers are inserted into the taper in the tailstock and held in place by the pressure of the workpiece against them. To remove them, the tailstock is cranked back, and a plunger pops the center out.
What is used to prepare the workpiece for tail support?
Center drills.
How are center drills different from regular drill bits?
Center drills drill right on their point, are short and rigid, and are double-ended.
Why is cutting oil recommended when using center drills?
To ensure sufficient surface speed for the cutting action of the center drill.
What is the recommended depth for center drilling the workpiece to prepare for tail support?
About two-thirds of the way up the tapered portion of the center drill.
Why is it important to use cutting oil when center drilling?
To ensure enough surface speed for the center drill to effectively cut, especially at the center of the workpiece where the surface speed is close to zero.
Why are center drills double-ended?
They are double-ended because they are short and rigid and tend to snap, so the other end can be used if one end breaks.
What is the purpose of center drilling the workpiece?
To create a precise hole for the centers to be inserted and to prepare the workpiece for tail support.
Why is it important to lock the tailstock before center drilling?
To secure the workpiece and prevent movement during center drilling.
What is the main reason for reducing the diameter of the stock in the lathe?
To achieve concentricity in the part
Why is it necessary to turn down the stock to the proper diameter when making a shaft?
To ensure the stock is perfectly straight and round
What undesirable finish can be found on hot rolled steel stock?
Mill scale
What does achieving concentricity in a part mean?
Ensuring the part is perfectly straight and round
What is backlash in a mechanical system?
The play or movement in gears before actual motion occurs
Why should one take up backlash before making a cut on a lathe?
To ensure that the carriage moves accurately with hand wheel movement
What needs to be done before putting a tool to the material to understand backlash?
Taking up the backlash
What does indirect read refer to in terms of cross-slide hand wheels?
Reading measurements indirectly from markings on another part of the lathe
What is run-out in a chuck system?
The excessive movement of a rotating part.
Why is it important to use larger stock than required when making a shaft?
To ensure there is enough material for future adjustments.
What is one common undesirable finish found on cold rolled material?
Corrosion inhibitor.
This quiz explores the purpose and impact of tail support in machining setups, demonstrating the increase in rigidity when utilizing tail support. It discusses how tail support prevents movement in the workpiece during cutting, improving cutting effectiveness.
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