PPE. The Lathe, and Lathe Accessories (Week 5) Flashcards
What PPE (Personal Protective Equipment) is required for Bandsaw?
Safety glasses must be worn at all times in work areas. Long and loose hair must be contained. Hearing protection must be worn. Sturdy footwear must be worn at all times in work areas.
What must have occurred before operating the benchtop grinder?
You must receive basic shop safety training and equipment specific training before using this tool. You must wear appropriate PPE and follow all shop rules.
When starting up the bench grinder, where is the recommended location
Stand to the side of the wheels.
What PPE is needed for turning and milling?
Safety glasses must be worn at all times in work areas,
Long and loose hair must be contained (cover or tip up long hair)
Gloves must not be worn when using/operating this machine;
Sturdy footwear must be worn at all times in work areas.
Don’t wear jewelry
Don’t wear loose clothing
Which type of Conventional Lathe is used in the labs?
Bench / Center / Engine Lathe
What is the definition of a Lathe Machine?
A lathe machine is a machine tool that is used to remove metals from a workpiece to give a desired shape and size.
How many Axes does a Lathe have?
2 axis
What are the 2 Axes on a lathe?
1.←z-axis - Feed movement (regarding the tool)
2.↑ x-axis - Cutting depth movement (regarding the tool)
What are the 4 main parts of a Lathe?
- Headstock
- Tailstock
- Carriage
- Bed
When is a Tailstock used?
It is usually used to apply support to the longitudinal rotary axis of a workpiece being machined. It is also used on a lathe to hold drilling or reaming tools for machining a hole in the workpiece. Also, tapping and tapper cut.
Regarding a tailstock, what is the difference between dead and live centers?
A live center is mounted in bearings and rotates with the work.
A dead center does not rotate.
How do you determine the size of a lathe?
Indicated by the swing, the length of the bed, and the distance between centers.
What are the two catergories of Lathe Accesories?
Cutting-tool-holding devices
* Straight and offset tool-holders
* Threading toolholders, boring bars
* Turret-type tool-posts
Work-holding, -supporting, and –driving devices
* Lathe centers, chucks, faceplates
* Mandrels, steady and follower rests
* Lathe dogs, drive plates
What are Lathe tool holders designed for?
Lathe tool holders are designed to safely hold a cutting tool in a precise location.
Some types of Lathe Tool Holders?
Quick change tap holder
Radial floating collet chuck
Jacobs taper tooling
Morse taper tooling
Custom tool holder
What is a Brazed Carbide insert tooling?
One form of insert tooling is a brazed carbide tool. These tools have a carbide cutting blank affixed to a steel shank by brazing.
Traits of a Indexable Insert?
Held in the holder by cam action or clamps
Types available
– Conventional
– Turret-type
– Heavy-duty tool-posts
Inserts are usually mounted on seats that fit within pockets in the end of the toolholder.
Inserts are classified by their shape.
What are 3 types of Cutting-tool-holding devices?
- Left-Hand Offset Tool holder
- Right-Hand Offset Toolholder
- Straight Toolholder
Traits of Left-Hand Offset Tool holder?
- Offset to the right
- Designed for machining work close to chuck and cutting left to right
- Designated by letter L
(left hand thumb direction indicates tool feed direction).
(away from chuck)
Traits of Right-Hand Offset Toolholder?
- Offset to the left
- Designed for machining work close to the tailstock and cutting right to left
– Also, for facing operations - Designated by letter R
(right hand
thumb direction indicates tool feed direction).
(towards chuck)
Traits of Straight Toolholder?
- General-purpose type
- Used for taking cuts in either direction and for general machining operations
Traits of Cutting-Off (Parting) Tools?
- Used when work must be grooved or parted off
- Long, thin cutting-off blade locked securely in tool holder by either cam lock or locking nut
- Three types of parting tool-holders
– Left-hand
– Right-hand
– Straight
Traits of Threading Tool-holder?
- Designed to hold the special form-relieved thread-cutting tool
- Has accurately ground 60º angle
– Maintained throughout the life of the tool - Only the top of the cutting surface sharpened when becomes dull
What is a Chuck?
Used extensively for holding work for machining operations - Work large or unusual shape
What are the 2 most commonly used Lathe Chucks?
- Three-jaw universal
- Four-jaw independent
What are the uses of a Lathe Center?
Work to be turned between centers must have center hole drilled in each end.
– Provides bearing surface
Support during cutting
Most common have solid Morse taper shank 60º centers, steel with carbide tips.
What is a Steady Rest?
When is it needed?
A steady rest is basically a heavy and rigid ring a fixed to the bed ways of a lathe or turning center.
It stands stationary from a rigid mounting on the bed, and it supports the workpiece at the rest’s center, typically with three contact points 120° apart.
Steady rests are needed when the length and stiffness of a workpiece makes it difficult to machine without distorting or deflecting the part.
Define Lathe Operation :
Turning
A cutting operation in which single point cutting tool removes material from a rotating work-piece to generate a cylinder
Define Lathe Operation :
Facing
The tool is fed radially inward- An operation of reducing the length/thickness of stock
Define Lathe Operation :
Form Cutting
The tool has a certain shape that is imparted on the workpiece by feeding the tooling radially
Define Lathe Operation :
Taper Turning
Instead of feeding the tool parallel to the axis of rotation, the tool is fed at an angle thus creating a tapered rotational shape
Define Lathe Operation :
Contour Turning
Instead of feeding the tool parallel to the axis of rotation, the tool follows a contour that is other than straight, thus creating a contoured shape
Define Lathe Operation :
Parting off
The tool is fed radially into rotating work at some location to cut off the end of part
Define Lathe Operation :
Drilling
Drilling is an operation of making a hole. The drill (multi-point cutting tool) is fed parallel to the axis of rotation.
Define Lathe Operation :
Thread Cutting
The pointed form tool is fed linearly across the surface of the rotating work part parallel to the axis of rotation at a large feed rate, thus creating threads
Define Lathe Operation :
Boring
A single-point tool is fed linearly, parallel to the axis of rotation, on the inside diameter of an existing hole in the part. The purpose of boring is to enlarge the size of an existing hole
Define Lathe Operation :
Reaming
Reaming is an operation of making a drilled hole accurate and clean.
Define Lathe Operation :
Knurling
This is an operation in which a regular cross-hatched pattern is imparted on the workpiece. This pattern facilitates holding a part. Knurling is not a machining operation, as no cutting takes place. Instead, it is a metal forming operation done in lathe machine
Define Lathe Operation :
Chamfering
The cutting edge cuts an angle on the corner of the cylinder, forming a “chamfer”
