What is a jobber drill?

Jobber drill bits are straight shank drills suitable for general purpose applications. This category includes bright, treated, TiN coated drills to machine a variety of materials. Heavy duty-split point drills, high helix and para-flute jobber drills along with cobalt bits meet the needs of most machinists.

What does jobber length mean for drill bits?

A jobber drill bit has a long length compared to its diameter. The length of the flute is between 8-12 or 9-14 times the diameter of the drill, depending on the drill specifications. For example, a 1/2″ diameter jobber drill will be able to drill a 4-1/2″ deep hole because it is 9 times the diameter in length.

What is the difference between jobber length and mechanics drill bits?

Jobber length drill bits are the most common and have a longer length compared to the diameter of the shaft. They are commonly used in softer materials such as wood, soft metals or composite. A mechanics length drill bit is a bit that has a shorter overall length, as well as a shorter flute length.

What is the role of a jobber?

Jobbers, also called “stockjobbers,” acted as market makers (MMs). They held shares on their own books and created market liquidity by buying and selling securities, and matching investors’ buy and sell orders through their brokers, who were not allowed to make markets.

Is Carbide better than cobalt?

Difference Between Cobalt and Carbide Carbide drill bits are generally more expensive than cobalt but can withstand higher temperatures and have greater wear resistance. This leads to longer tool life, often offsetting the cost difference.

What is HSS jobber drill bit?

In stock. Made from high speed steel material. 135° Split point allows for faster drilling and titanium nitride hard ceramic coating triples the life of the cutter. Black oxide and gold finish.

Why are they called jobber drill bits?

Since these were moderate length bits, they were usable for a wide range of different jobs, they were nicknamed “jobber-length” bits. Soon after, jobber-length became sort of a catchall term, with a similar meaning as multi-purpose. To be specific, jobber length bits are 8-14 times longer than they are wide.

How did the jobber control the workers?

Jobber was employed to get new recruits for the factories or industrialists. The jobber misused his position and power in the following ways :i Initially jobbers cured people from his village ensuring them jobs. He also helped then settle in the city and lent them money in the times of crisis.