Lathe Process

Paperless Parts has an interrogation module for lathe/turning operations. This module extracts useful information that influences pricing on turned parts. We will provide information such as a recommendation for cylindrical stock, setup count, and call out the need for live tooling.

We determine setup count assuming a typical lathe machine with a standard set of tools.

To analyze a part for a lathe/turning process, add this line to your pricing program:

lathe = analyze_lathe()

The lathe object will contain the attributes described below.

Lathe attributes
Attribute	Description	Metric units	US units
`setup_count`	Total number of detected setups	n/a	n/a
`stock_radius`	Radius of recommended stock	mm	in
`stock_length`	Length of recommended stock	mm	in
`features`	P3LList copy of all lathe features	n/a	n/a
`feedback`	P3LList copy of all lathe feedback	n/a	n/a

Examples

This example suggests how to price your material based on the recommended stock from the interrogation:

units_in()
lathe = analyze_lathe()
buffer = var('Buffer', 0.125, 'Stock buffer in inches', number)
set_operation_name(part.material)
stock_volume = 3.14159 * (lathe.stock_radius + buffer / 2)**2 * (lathe.stock_length + buffer)
PRICE = stock_volume * part.mat_cost_per_volume * part.qty
DAYS = part.mat_added_lead_time

This example shows how to price the lathe op based on recommended setups and a material removal rate:

units_in()
lathe = analyze_lathe()

shop_rate = var('Shop Rate', 75, '$ / hr', number)
setup_time_per_setup = var('Setup time per setup', 0.5, 'hr', number)
minimum_runtime = var('Min Runtime, hr', 0.08, 'Minimum turning runtime in hours', number)

buffer = var('Buffer', 0.125, 'Stock buffer in inches', number)

stock_volume = 3.14159 * (lathe.stock_radius + buffer / 2)**2 * (lathe.stock_length + buffer)
volume_removal = stock_volume - part.volume

# establish base removal rate, and if volume removal is greater than certain threshold, use a higher value
vol_cut_rate = var('Volume Cut Rate', 50, 'Cu. In./hr', number, frozen=False)
if volume_removal > 15:
  vol_cut_rate.update(70)
vol_cut_rate.freeze()

runtime = var('runtime', 0, 'Runtime, hr', number, frozen=False)
setup_time = var('setup_time', 0, 'Setup time, hr', number, frozen=False)

# now establish runtime based on max between minimum runtime and volume removal driven runtime
runtime.update(max(minimum_runtime, volume_removal / vol_cut_rate))
runtime.freeze()

# now update setup time based on lathe detected setup count
setup_time.update(lathe.setup_count * setup_time_per_setup)
setup_time.freeze()

PRICE = (setup_time * shop_rate) + (runtime * part.qty * shop_rate)
DAYS = 0