Clarke CMD10 Specifications download pdf (Page 13)

knob whilst grasping the knurled rim of the scale and turning until the zero on the scale lines

up with the pointer. Back off slightly and start the machine.

Turn the adjuster once again until the zero mark lines up with the pointer and double check

that the cutter is just touching the work - if not, make the necessary adjustment. Any further

movement of the adjuster will commence cutting.

General Notes on Milling

Set up the workpiece in a similar manner to that for drilling.

• Slowly bring the cutter into contact with the work piece and start machining.

• DO NOT attempt to make too bigger cuts than the cutter and machine are capable

of, it is much better and safer to make several small passes.

• Always use an appropriate cutting/cooling fluid whilst machining, which can be

applied with a small brush etc., NOT FINGERS.

• DO NOT allow swarf to build up in the cutting area. Stop the machine and remove

using a suitable implement, (brush etc.).

• When finished turn the machine OFF, return the cutter to its highest position and allow

it to come to a complete stop before attempting to remove the work piece or tool.

• Always finish by cleaning and drying the machine, and storing all tools and accessories

etc., safely.

Cutting Speeds

In order to drill, and particularly mill satisfactorily, it is most important that the correct

cutting speed is used,

Cutting speed is the speed at which the cutting edge of the tool passes over the work.

This is usually expressed in feet per minute or metres per minute.

For a given material there will be an optimum cutting speed for a certain set of machining

conditions, and from this speed the spindle speed (RPM) can be calculated. Factors

affecting the calculation of cutting speed are:

• The material being machined (steel, brass, aluminium etc. - see table below)

• The material the cutter is made from i.e. Carbon steel High speed steel (HSS), carbide,

or ceramics.

Material type meters per min feet per min

Steel (tool) 15 - 18 50 - 60

Mild steel 30 - 38 100 - 125

Cast iron (medium) 18 - 24 60 - 80

Bronzes 24 - 45 80 - 150

Brass (soft) 45 - 60 150 - 200

Aluminum 75 - 105 250 - 350

Please note that It is not within the scope of this manual to provide a tutorial on cutting

speeds or the methods used to determine spindle speeds (RPM), for your particular

application. It is assumed that the operator is familiar with these practices.

A good rule of thumb is, the smaller the hole or depth of cut, and the softer the material to

be machined etc, the faster the speed.

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 23 24

No comments

Clarke CMD10 Specifications Page 13