Once again, dial up the initial parameters, and this time, hit the “Slot” button. For roughing, the Cut Optimizer tells us we can cut to a depth of 0.3466″ before we get too much deflection. Two passes at that depth will get us to 0.6932″ deep. Depth of cut increases, the width of the “contact area” is increased, and thus increases the forces. Wen-Hsiang Lai: Modeling of Cutting Forces in End Milling Operations 19. A biscuit joiner should cut a slot slightly deeper than half the width of the biscuit you’re trying to fit. This space provides some wiggle room, but still ensures that about half remains on each side of the joint. Here’s how to check your joiner’s depth setting. First, make a test slot. Write a CNC Part Program for the figure shown. For side milling, take speed 1200 rpm & feed 100 mm/min For drilling holes, take speed 1200rpm & feed 80mm/min For slot milling, take speed 1200rpm & feed 120mm/min Take hole diameter as 15mm Use absolute coordinate system.

CNC Machining Tool Parameters

Parameters for Slot Drills on aluminium

Remember to set a plunge feed rate – found in the Advanced area of the parameter window – all tools must feed more slowly into materials than horizontally through material.

Diameters between those stated are also available in 1mm increments.

All feed rates are in mm per minute.

Ball Nosed cutters - decrease feedrates by 20%

Tools above 10mm dia. can be used but are restricted by machine power and the clamping system used - seek appropriate advice.

Maximum Depth of Cut

Whether it's a slot drill or ball nosed cutter, our standard tool range has either a 6mm or 10mm shank diameter. The cutter diameter will be equal to or less than this dimension - see below image. The maximum depth of cut is restricted by the length of the cutting edge, therefore if you want a 1.5mm radius in the corner of a pocket, that pocket can be no greater than 6mm deep – the cutting edge length of a 3mm dia. tool.

Engraving Tool

Tool Spindle Speeds and Feedrates

Surface Speed

A particular cutting tool material has an optimum speed at which it should travel through a particular material.

Example: The tip of a High Speed Steel [HSS] cutting tool should
travel through aluminium at 150m/min.

Therefore we need to control the tip speed of the milling cutter at the radius of the tool - its circumference [in metres] multiplied by its revolutions per minute.

Spindle Speed

Spindle Speed = Surface Speed / Circumference

For a 10mm [0.01m] dia. cutter:

circum. = Pi x Dia = 3.14 x 0.01 = .0314m

For a cutting speed of 150m/min: 150m/.0314m = 4777rpm

Slot Milling Depth Of Cut Calculator

Feedrate

Feed rate is the distance a cutting tool moves through the
material per minute.

This rate dictates how much material each tooth of the cutting tool removes per revolution.

Feedrate is dependent on the:

Slot Milling Depth Of Cut Files

• Surface finish desired
• Power available at the spindle (to prevent stalling of the cutter or workpiece)
• Rigidity of the machine and tooling setup (ability to withstand vibration or chatter)
• Strength of the workpiece (high feed rates will collapse thin wall tubing)
• Characteristics of the material being cut, chip flow depends on material type and feed rate
• The ideal chip shape is small and breaks free early, carrying heat away from the tool and work.

Feed rate (mm/min) = Tooth Load (mm). X Number of teeth. X Spindle Speed in RPM.

Slot Milling Depth Of Cut Chart

Denford: http://www.denford.com/Feeds and Speeds.html

Slot Milling Depth Of Cut Outs

Wiki: http://en.wikipedia.org/wiki/Cutting_speed