Feeds and speeds calculation in CNC Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to calculate spindle speed (RPM) given cutting speed and tool diameter.

CNC Programming

spindle_speed = ([1] * 1000) / (3.14 * tool_diameter)

Drag options to blanks, or click blank then click option'

Atool_length

Bfeed_rate

Cdepth_of_cut

Dcutting_speed

Attempts:

3 left

💡 Hint

Common Mistakes

Using feed rate instead of cutting speed.

Forgetting to multiply cutting speed by 1000 to convert meters to millimeters.

The spindle speed (RPM) is calculated by dividing the cutting speed (in meters per minute) multiplied by 1000 by the circumference of the tool (π times diameter).

2fill in blank

medium

Complete the code to calculate feed rate (mm/min) given spindle speed and feed per tooth.

CNC Programming

feed_rate = spindle_speed * [1] * number_of_teeth

Drag options to blanks, or click blank then click option'

Atool_diameter

Bfeed_per_tooth

Ccutting_speed

Ddepth_of_cut

Attempts:

3 left

💡 Hint

Common Mistakes

Using depth of cut instead of feed per tooth.

Not multiplying by the number of teeth.

Feed rate is calculated by multiplying spindle speed (RPM), feed per tooth (mm), and the number of teeth on the tool.

3fill in blank

hard

Fix the error in the code to correctly calculate material removal rate (MRR) in cubic millimeters per minute.

CNC Programming

mrr = [1] * feed_rate * depth_of_cut

Drag options to blanks, or click blank then click option'

Aspindle_speed

Bfeed_per_tooth

Cwidth_of_cut

Dtool_diameter

Attempts:

3 left

💡 Hint

Common Mistakes

Using spindle speed instead of width of cut.

Confusing feed per tooth with feed rate.

Material removal rate (MRR) is calculated by multiplying width of cut, feed rate, and depth of cut.

4fill in blank

hard

Fill both blanks to create a dictionary of feeds and speeds for different tools.

CNC Programming

feeds_speeds = {tool: {'speed': [1], 'feed': [2] for tool in tools}

Drag options to blanks, or click blank then click option'

Atool_speeds[tool]

Btool_feeds[tool]

Ctool_depths[tool]

Dtool_lengths[tool]

Attempts:

3 left

💡 Hint

Common Mistakes

Using depth or length dictionaries instead of speeds or feeds.

Mixing up speed and feed values.

This dictionary comprehension assigns the speed and feed values from separate dictionaries for each tool.

5fill in blank

hard

Fill all three blanks to filter tools with feed rate above 1000 and speed below 5000.

CNC Programming

filtered_tools = {tool: data for tool, data in feeds_speeds.items() if data['feed'] [1] 1000 and data['speed'] [2] 5000 and 'CNC' [3] tool}

Drag options to blanks, or click blank then click option'

A>

B<

Cin

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using == instead of > or < for numeric comparisons.

Using == instead of 'in' for substring check.

The code filters tools where feed is greater than 1000, speed is less than 5000, and the tool name contains 'CNC'.