We started from the bottom now we’re, on the topic drilling machine. In our previous article, drilling machine was explained to be an equipment use cutting a circular-shape hole in a workpiece. Drilling machine operation was also included as its include, boring, countersinking, counterboring etc. The drilling is achieved with the use of a drill bit.
Today we’ll look deeply into the two basic types of drilling machine which are power feed and hand feed drilling machine.
Hand feed drilling machine
The hand feed types of drilling machines are simple and common types use in most workshop today. It is portable and a light duty machines that are hand-feed by man’s power, using the handle. The operator is able to feel the action of the cutting tool as it cuts through the workpiece.
These drilling machines are available as bench or floor-mounted, they are driven by electric motor. This electric motor turns the drive belt on a pulley that connects to the spindle pulley. Hand feed drilling machine is essentially high-speed and are used on small workpieces. The sizes of hole drill with these machines is ½ inch or smaller. The head can move up and down on the column by losing and locking the chuck. These allows the drilling machine to drill different types of height of work.
Power-Feed drilling machine
The power feed drilling machine is used in a maintenance workshops for medium-duty work, or work that requires large drills. These machines are usually larger and heavier than the hand feed. They are designed with the ability to feed the cutting tool into the work automatically. The depth can also be set at a preset to cut per revolution of the spindle at thousandths of an inch per revolution.
The capability of power-feed drills is needed for drills or cutting tool that are over ½ inch in diameter. This is because they require more force to make the hole than the force provided by hand. Speeds varies from about 50 rpm to about 1,800 rpm in power-feed drills. special operations like counterboring, countersinking, reaming etc. are achieve with slower sleeps.
The sizes of this types of machines range from 17-inch to a 22-inch center drilling capacity. They are usually floor mounted and they can up to 2 inches, which is mounted into tapered Morse sockets. T-bolts and clamps are used to clamp larger workpieces directly to the table or base. While smaller workpieces are held with a vise.
Power transmission in drilling machine used to transmit power for its work, this power is supplied from the electric motor. The transmission process happens with the help of a V belt and pulley stacks, which connects the motor and the spindle. adjustment in the mechanism also help to generate different speed to the spindle.
I hope you found this post interesting and you’ve attained knowledge. If so, you can freely give your point in our comment section and please share with other students. Thanks!