Mini Drilling Machine Guide

Drilling machines or drills, in general, are one of the most widely used and most useful machines in the world for forming and finishing holes in workpieces. A mini drilling machine is a sub-category of drilling machines, and its biggest feature is its small size. Mini drilling machines are ideal for home use or small workshops, and also have greater flexibility and portability. In this article, we take a look at the structure of mini drilling machines, their applications, and their advantages. Ready, steady, drill!

Mini Drilling Machine Structure

Small drilling machines are a sub-category of drilling machines, and their biggest feature is their small size. A mini drilling machine is ideal for home or small workshop and has more flexibility and portability. All drilling machines feature a rotating cutting tool that advances along its axis into a fixed workpiece, creating a hole. The six common operations that a small drilling machine can perform are drilling, reaming, boring, counterbore, and tapping. The capacity of the drilling machine depends on the size of the largest workpiece that the spindle can center, the maximum clearance below the spindle, and the maximum drill diameter that can be fed at a real feed rate through mild steel.

Advantages of Mini Drilling Machines 

The difference between a mini drilling machine and "Big Brother" is that it is a new and innovative method with the same impact force and power for precision micro drilling operations. In many machines, hard on-line interchangeable V-shaped bearings replace traditional ball or sleeve bearings. The drill bit of the mini drilling machine becomes its own main shaft, eliminating run-out, which is a common factor in traditional machines that use ball bearings, sleeve bearings, spindles, chucks, or chucks.

For the average end-user, the size of the mini drilling machine is just right for all drilling projects. Modern mini drilling machines are equipped with a rugged aluminum housing, a slotted base (for fixing fixtures) and a sturdy vertical column, which can be quickly released to adjust the distance between the chuck and the table. Due to the use of powerful motors (500 watt and above), they can provide high working efficiency and can perform continuous and reliable drilling operations, while the structure is very compact, usually weighing no more than two kilograms.

What to consider when choosing a Mini Drilling Machine 

Hole Diameters
Think about the size of the hole to be drilled; this will determine the basic size of the required machine 

Drilling Speed
Also, think about the material to be drilled and the size of the hole and check if the required speed is available. 

Part Size
Make sure that the depth of the throat is sufficient, check the distance between the nose of the spindle and the worktable, and the stroke of the spindle is sufficient 

Part Weight
Ensure that the weight of the parts can be carried on the machine's table. If it is a very heavy component, please consider using the base of the machine

Accuracy Requirements
For occasional operations with not too high quality requirements, cheaper mini drills are sufficient. For mass production, models with power sources should be considered.

Variation Requirements
If the hole size and speed change, consider using a gear head or variable belt drive for larger hole sizes. Electronic speed control for smaller hole sizes 

Taper Type
The chuck mounted directly on the spindle of a mini drilling machine is the simplest form of a tool holder. The morse taper spindle has more flexibility in use, but if only small-sized holes are required, unnecessary joints can be introduced. Larger machines usually have a morse taper spindle 

Single or three-phase 
If there is a suitable power supply, be sure to opt for a three-phase model. Single-phase motors bring unnecessary vibration to the machine, while three-phase motors are usually more reliable and run more smoothly.

Types of Mini Drilling Machines

From simple portable to highly complex automatic and CNC machine tools, a wide variety of mini drilling machines exist, the standard two types are the following two:

Portable mini drilling machine
A light-weight, very compact machine that usually can drill holes with a maximum diameter of 12.5. As its name indicates you can carry it around easily as there is no need for a complicated, stationary setup. Usually a small motor running at very high speed is driving  the portable mini drilling machine that is therefore capable of drilling holes in any position.

Sensitive mini drilling machine
Also, a lightweight high-speed machine that is specifically designed for drilling small holes in light-duty operations. In this type of mini drilling unit, the workpiece is placed on the table and the drill is fed into the work by hand pressure. The high rotational speed of drill and hand-feed are the main features of a sensitive mini drilling machine. Generally, the machine can rotate a drill bit of 1.5 to 15.5 at a high speed of 20000 RPM.

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