Lathes

Question 1

What factors determine feed rate and RPM?

Answer 1

The material being cut, the material of the cutting tool and the operation being performed

Question 2

Complete the following: The harder the material that is being cut, the lower…..

Answer 2

The lower the cutting speed is

Question 3

Complete the following: The Harder the cutting tool is, the faster……

Answer 3

The faster the cutting speed is

Question 4

Use a what speed for roughing cuts?

Answer 4

A slower cutting speed

Question 5

Use a what speed for finishing cuts?

Answer 5

Use a faster cutting speed

Question 6

Why is it hard to give definitive answers on feed rates for lathes?

Answer 6

Because a lot of it depends on rigidity of cutting tools and the work piece

Question 7

What is the approximate feed rate for roughing with a HSS tool on mild steel? What is that in MM

Answer 7

0.010-0.020 per rev or 0.25-0.5mm

Question 8

What is the down side of high feed rates in regards to your cutting tool?

Answer 8

It dulls the tool quickly

Question 9

What is the approximate feed rate for finishing?

Answer 9

0.002-0.005 inch per rev or 0.05-0.13 mm per rev

Question 10

What do you set your cut depth on?

Answer 10

you set it on the cross feed dial

Question 11

What is backlash?

Answer 11

Backlash is the play between the cross feed screw and the nut, It is unavoidable on standard machines and must always be taken into consideration. You must always be turning the screw clockwise to your final setting. You must turn it counterclockwise when boring.

Question 12

What is a direct reading dial?

Answer 12

A direct reading dial is whatever you move the dial is exactly what will be taken off the diameter of your work piece. If you move the dial 0.001 thou is will take 0.001 off the OD of your work piece

Question 13

What is a indirect reading dial?

Answer 13

An indirect reading dial shows you what you are taking off the radius of the work piece. So if you move the dial 0.001 it will take 0.002 off the diameter of the part.

Question 14

What is a benefit of boring vs’s drilling or reaming?

Answer 14

Boring runs true to the axis of rotation of the center of the part. Drilling and reaming can drift from the true center.

Question 15

What are some ways to reduce chatter while using a boring bar?

Answer 15

1- Have as little overhang as possible from the tool post
2-Have the set up as rigid as possible
3-Dampen the bar by holding a piece of wood on the boring bar
4- Use a boring bar with a carbide tip

Question 16

For reaming holes under 1/2 inch what size should you pre drill be?

Answer 16

It should be 1/64th smaller

Question 17

For reaming holes larger than 1/2 inch what size should your pre drill be?

Answer 17

It should be 1/32 smaller

Question 18

What is one issue with you reamer being miss aligned in the tail stock?

Answer 18

It can ream a hole that is larger than your desired size

Question 19

Where do you find the thread pitches that a lathe can cut?

Answer 19

It will be posted on the lathe so get familiar with the lathe you are using

Question 20

How do you set the thread cutting tool against the work piece to cut threads?

Answer 20

You set the tool perpendicular to the work piece

Question 21

What do you need to cut a thread on a lathe?

Answer 21

You need the thread depth, a center gauge, carbide threading insert, a feed rate

Question 22

How do you calculate the strait depth of cut of a thread?

Answer 22

0.6134 x pitch

Question 23

What are the three main types of cutting fluid?

Answer 23

Cutting oils, emulsifiable oils, and chemical cutting fluids

Question 24

What is sintered metal?

Answer 24

It is when you cook the metal after adding the materials to steels to what you want.

Question 25

Does carbide need lots of coolant?

Answer 25

No, it does not like the heating and cooling that can happen and leads to cracks. It only needs a very small amount of coolant

Question 26

What is the difference of universal vs’s combination chucks for the lathe

Answer 26

universal has a scroll that moves all the jaws together and then micro adjustment screws that can adjust the scroll position. Combination has a scroll also but then each jaw can be moved individually also.

Question 27

What does tail stock off set measure radial or diametral?

Answer 27

radial, it is measured off the centerline

Question 28

Why is a lathe dangerous compared to newer designed machines?

Answer 28

It does not have safety guarding in place and has not adapted a lot of the new safety techniques in regards to the operator position and rotating equipment

Question 29

How are lathes sized?

Answer 29

The largest piece that can turn in the lathe and the largest part that can fit between centers

Question 30

What are the five main parts of a lathe?

Answer 30

-The bed
-The headstock (house’s quick change gears)
-The carriage
-The tailstock
-The tool post

Question 31

Should the machine be locked out when working in the gear box?

Answer 31

Yes, always lock out the machine

Question 32

What does the quick change gear box drive?

Answer 32

The lead screw or feed rod it is also known as

Question 33

What does the split nut lever do?

Answer 33

It engages the split nut on the lead screw to rotate at the pre determined feed rate

Question 34

Do compound rests have power feed?

Answer 34

No the do not have power feed

Question 35

How much can a compound rest rotate?

Answer 35

It can rotate 360 degrees

Question 36

What direction does the saddle move?

Answer 36

It moves parallel to the work piece

Question 37

What direction does your cross slide move?

Answer 37

It moves perpendicular to the work piece

Question 38

What does the apron comprise of?

Answer 38

It houses the drive gears, split nut mechanism, the feed change lever, automatic feed engage lever and the carriage hand wheel

Question 39

Apron hand wheels move the carriage how?

Answer 39

Rack and pinion