Nims Measurement Study Guide

NIMS MEASUREMENT STUDY GUIDE

For safety, chips should be removed a milling or drilling machine table with a brush.
In addition to knowing how to work as a machinist, it is important for your safety and the safety of your fellow workers to know first aid and emergency procedures.
The Occupational Safety and Health Administration is the governmental agency that regulates safety and health requirements for industry.
To remove materials (solids) lodged in the eye pull the top lid over the bottom lashes.
If a process calls for ½” -13 NC hole using a 27/64 drill size 75 % of a thread will be obtained.
On a hazardous material identification guide, the degree of hazard is measured by a numbering system. 4 is the most hazardous.
B is a double-cut file.

In SPC range refers to number of parts between samples.
Not having a handle on the file is a common cause of injury when using a hand file.
The quickest and most accurate method for checking the height of two or more workpieces is to use the surface plate, gage plates, and a Vernier height gage.
A sampling plan provides the dimensions to inspect.
The specific machine information concerning lubrication/maintenance is found in the Preventative Maintenance Manual.
Safety meetings are a good place to gain knowledge of new chemicals used in the workplace and information contained in the MSDS sheet.

Long thin parts have been ground and the flatness is out of tolerance. A possible cause is machine foundation is inadequate.
The gage block buildup for a 15 degree angle on a 5-inch sine bar is 1.2941”.
The acronym MSDS stands for Material Safety Data Sheet in a typical manufacturing environment.
A part is considered rejected when it is out of tolerance.
The acronym LEL can be found on all material safety data sheets. This stands for Lower Explosive Limit.
Surface finish can be checked with a comparison chart.
The most important reason for the disposal of rags and wipes after uses is the fire hazard potential.
Caution must be given to the disposal of cleaning fluids that are potential health hazards when maintaining the safety of your work area.
The correct reading of the 0”-1” depth micrometer in the picture is .332

Pitch is the dimension that is checked when measuring screw threads with a thread micrometer.
The purpose of wringing gage blocks before stacking them is to remove air between the surfaces.
The acronym TLV can be found on all material safety data sheets. This stands for Threshold Limit Value
Reamed holes can become oversized due to reaming too much material.
To measure an angled surface parallel to a reference surface, an angle plate should be used.
Using a cloth to clean away cuttings is NOT considered good safety practice for an operator working on a milling machine.
While machining a block of tough material using a high speed steel cutter, excessive tool wear begins to occur. The first thing to do is decrease spindle speed.
None ferrous metals is a classified metal that does not have Iron as its basic ingredient.
A process calls for a slip or sliding fit for a 1.000” dia. Shaft to fit into a hole. The clearance between the shaft and the hole should be .0009.
1015 is the steel that has the lowest carbon count.
The correct reading of the dial caliper in the picture is .658.

A process plan calls for a slot .500” + .000 - .002” wide by 1/8 deep to be milled on a vertical milling machine. The proper process to mill the slot is one roughing pass using a 3/8” dia. End mill and one finish pass using a ½” dia. Cutter.
One cause of tapped holes becoming too tight might be tap wear.
When hand filed surface show excess scratching, one cause may be clogged with chips (pinning).
The tool (from the picture given) that could NOT be used to measure the diameter of this whole is the depth micrometer.

The instructions for general machine maintenance are found in the maintenance manual.
A dial bore gage is used to inspect holes.
Using the Machinery’s Handbook, 4 is the correct number of blocks you can stack to guarantee the most accurate reading for the possible height of 3.6875” with an 81 gage block set.
Before mounting a new chunk on a lathe the taper/spindle should be checked for dirt or metal chips.
A sampling of parts is the number of random parts to inspect.
Hot Rolled Steel- The bar has a black rough surface; dusty chip when filed; and orange spark when ground.
If accuracy is most important, the depth caliper is the measuring tool (from the pictures given) would be used to measure the depth of this pocket.

Metal cuttings are considered a part of the trade.
When working where materials are stored overhead or where overhead cranes are being used; hard hats should be worn.
Loose clothing, long hair, and dangling jewelry are potential hazards when operating turning machinery.
To select the correct type of measuring tools to inspect a part, the first items to review are the tolerances of the dimensions you are inspecting.
While drilling a through hole in a drilling operation, the drill is most likely to grab in a workpiece as it breaks through the bottom of the workpiece.
The correct reading of the scale in the picture is 11/16 inch.

If using a set of pin gages to check the size of a .257” – diameter hole and 17/64” pin slips into a hole, the hole is oversized.
The correct reading of the metric micrometer in this picture is 9.520 mm.

One surface of the workpiece is to be finished to a 2 micro inch finish.

If accuracy is most important, the dial caliper is the measuring tool you would use to measure the width of this pocket.