Universal Milling machines & CNC

Second-hand Universal Milling Machines & CNC

All-round metalworking with universal milling machinesThe universal milling machines are named this way as they are able to change pieces of metal into any conceivable product. One more excellent feature of universal milling machines is that they are very customizable in that they are able to be extended with many different types of tools.

What does a universal mill comprise of?

A universal mill comprises of:
●Two spindles
●A work table

The milling table works in synchronized movements with the spindles to manufacture a final workpiece, these are very diverse by manufacturer and product. On most models, the table passes along the X and Y axis, the spindles on the other hand run on the Z axis. It is also possible to produce two additional movements with the correct tools and machine attachments. Top of the range universal mills the tables are able to pivot and rotate and allow the milling head to travel around the product.

Universal milling machines come in various versions including CNC, manual and cycle controlled.
CNC machines has been the standard for a long time now in industrial contexts, a few smaller manufacturers still build manual universal mills.

 

Distingushing between the different types of milling machines

Despite its name, the universal milling machine is not appropriate for all jobs: when dealing with exceptionally bulky and parts that weigh a lot, having the work table move is a disadvantage and causes more problems than it solves. Thus, the gantry milling machine was created by industry to solve this problem.

Gantry milling machines performance levels are second to none, the spindle moves around the component via a gantry guiding system. There are also a few other classes of milling machines that specialize in doing different tasks, such as the knee-type and bed-type milling machines.

 

What would you use universal mills for?

Universal milling machines are usually used manufacturing single pieces, however with the advent of CNC machines with digital controls and computing technology means that re-production of a single part or product is easily produced again and again as the product is stored within the memory of the computer.

Different industries have produced a range of milling machines that are used for uniform reproduction, however if you are trying to create smaller batches, to train employees or produce prototypes then basic universal milling machines are what you are after. These types of milling machines are will often be seen in repair workshops all over the world.

Add-ons for the Universal Mill

Milling machines should, without fail be equipped with cooling lubrication. This lessens the damage and wear to milling tools and parts whilst simultaneously keeping up high standards or quality.

Machine housing and partition walls are an option to keeping your environment in and around the workstation clear, both these options are extremely advantageous. Lighting the milling machine and work area also needs to be taken into consideration.

Efficiency over a longer time period can also be maintained through compatibility from the recording of workpieces that have been created.

 

Things prospective buyers would like to know before they buy a Universal Milling Machine?

When buying a universal milling machines, many factors have to be thought about before purchase, the machines come in many different sizes, processing options and producible tolerances.

As the name suggests, the universal milling machines have the option of having a great scope in the varied tools that can be used with them, however not all products can be made on every milling table with precision and in a high quality manner.

Here are some questions to answer when buying the correct machine:

●What is the size of the product that will be produced?
●Are regular re-productions needed or a series of the same product over and over?
●What are the tolerances levels that are needed within the product?

For very big workpieces that are either have a lot of weight to them, very hard materials or precision products, the better the standard of machine design will need to be purchased. More basic milling machines are still excellent at producing items such as fittings or prototypes.

Should you want to create pieces in series from solid steel that need to be very precise whilst also being very resilient then you will need a milling machine that is fit for purpose and of good quality.

If the intent is to produce quality products then the minimum requirements are:
●SK 30 or SK 40 tool holder

●A good quality brand should be selected that has a good reputation for building milling machines

●250 x 700 mm² of clamping surface
●A speed of 50 rpm in the slowest mode to allow threaded holes to be machined
●3000 rpm for contours

By following these attributes, an excellent product can be produced from the softer metals: Copper, aluminum, bronze and possibly steel.

Milling accessories that are on the market should be looked at before buying, items such as machine vices, box cubes, dividers and other tools including other peripheral items.

These tools and accessories can run to more than the cost of the machine, so be sure to do some research on what you will need to create your product before purchasing the machine.

Purchasing a second-hand Universal Milling Machine

Be sure to look and possibly test a used milling machine when you are looking at purchasing one or more. Remember to check the guide mechanisms on the machine to check that they remain in place and solid.

If the machine is experiencing electrical problems then it is quite an easy fix to get the machine working again.
Checking that the tracks are able to be spun manually, freely and will little resistance from the hand wheel. Old, used or worn-out bearings could be a problem.

By the nature of how the machines work, dents, dings and scratches are natural on a second-hand milling machine. A top tip would be that if a used machine has a new coat of paint on it, you should be slightly suspicious about what is hiding beneath the paint.

Of course the machine might have been faithfully restored to its former glory but it maybe that the paint is hiding a multitude of problems beneath.

If you can run a test on the milling machine you are thinking of buying then you should. Also remember to measure with a micrometer screw to make sure that you are buying a machine that will be capable of reaching your workmanship goals in relation to the quality of your product.

In an ideal scenario, buyers should perform a test run on a prospective second-hand machine with a sample piece and then measure it using a micrometer screw to ensure the machine is capable of attaining the quality desired.
How to operate a milling machine safely?

Machine operators are still needed, even though most of the milling functions are now automated. Making adjustments and setting the machine up are roles the operator must take. Other requirements are fixing and releasing products, choosing the right cutting tools and mounting said tools etc,

Good CAD skills and experience working with computers are also needed by the operators so that they can read designs and program the CNC machines to produce the products.

Operators must also know safety and operating documentation of the machines whilst also wearing the correct PPE and safety wear for the job. Operators must wear safety glasses whilst operating the machines.

Best-known brands

Good manufacturers of milling machines include: GILDEMEISTER, MAZAK, ERNAULT & SOMUA, SCULFORT, GEMINIS, OKUMA, HOESCH, TRAUB, COLCHESTER, EMKO, MORI SEIKI, ARLO, LNS, PINACHO

Refurbished and tested second-hand milling machines

We completely refurbish and test our used milling machines to ensure the best quality possible.
We are also available to refurbish machines to your specialized demands.

Why choose a second-hand milling machine from our company?

We have extensive industry experience in this area and are specialists in the procurement and sales of used industrial machinery including grinders and lathes amongst many others. We have a large amount of stock and take care of everything from dismantling to the transport and installation at your place of choice in one easy process. Our staff are also experts in their field and canoffer support and guidance throughout.