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Non-Productive Time in Turning Formula

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Non-Productive Time (NPT) refers to the time during which a machine is not actively engaged in producing parts. Check FAQs

NPT = (\frac{t s + N t \cdot t st}{N b}) + t ln + (t pt \cdot n 0)

NPT - Non-Productive Time?t_s - Basic Setup Time?N_t - Number of Tools Used?t_st - Setup Time Per Tool?N_b - Batch Size?t_ln - Loading And Unloading Time?t_pt - Tool Positioning Time Per Operation?n₀ - Number of Operations?

Non-Productive Time in Turning Example

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With units

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Here is how the Non-Productive Time in Turning equation looks like with Values.

Here is how the Non-Productive Time in Turning equation looks like with Units.

Here is how the Non-Productive Time in Turning equation looks like.

28.1667 = (\frac{20.5 + 4 \cdot 10}{3}) + 30 + (1.5 \cdot 5)

28.1667min = (\frac{20.5min + 4 \cdot 10min}{3}) + 30s + (1.5min \cdot 5)

28.1667 = (\frac{20.5 + 4 \cdot 10}{3}) + 30 + (1.5 \cdot 5)

Tip: Use pencil () icon above to edit Input Values and Units.

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Non-Productive Time in Turning Solution

Follow our step by step solution on how to calculate Non-Productive Time in Turning?

FIRST Step Consider the formula

NPT = (\frac{t s + N t \cdot t st}{N b}) + t ln + (t pt \cdot n 0)

Next Step Substitute values of Variables

∴

NPT = (\frac{20.5min + 4 \cdot 10min}{3}) + 30s + (1.5min \cdot 5)

Next Step Convert Units

∴

NPT = (\frac{1230s + 4 \cdot 600s}{3}) + 30s + (90s \cdot 5)

Next Step Prepare to Evaluate

∴

NPT = (\frac{1230 + 4 \cdot 600}{3}) + 30 + (90 \cdot 5)

Next Step Evaluate

∴

NPT = 1690s

Next Step Convert to Output's Unit

∴

NPT = 28.1666666666667min

LAST Step Rounding Answer

∴

NPT = 28.1667min

Non-Productive Time in Turning Formula Elements

Variables

Non-Productive Time

Non-Productive Time (NPT) refers to the time during which a machine is not actively engaged in producing parts.

Symbol: NPT

Measurement: TimeUnit: min

Note: Value should be greater than 0.

Basic Setup Time

Basic Setup Time is the basic time required to load/unload the workpiece and position the tool for production for one component.

Symbol: t_s

Measurement: TimeUnit: min

Note: Value should be greater than 0.

Number of Tools Used

The Number of Tools Used is the total number of tools used for manufacturing a batch of products.

Symbol: N_t

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Setup Time Per Tool

Setup Time Per Tool is defined as the amount of time taken in setting up the tool while machining.

Symbol: t_st

Measurement: TimeUnit: min

Note: Value should be greater than 0.

Batch Size

Batch Size is the count of similar kinds of products to be manufactured.

Symbol: N_b

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Loading And Unloading Time

Loading And Unloading Time is the time required to load/unload the workpiece before the start of machine operation.

Symbol: t_ln

Measurement: TimeUnit: s

Note: Value should be greater than 0.

Tool Positioning Time Per Operation

Tool Positioning Time Per Operation is defined as the time taken in changing the tool before the start of operation.

Symbol: t_pt

Measurement: TimeUnit: min

Note: Value should be greater than 0.

Number of Operations

The Number of Operations is defined as the total number of operations done in a batch.

Symbol: n₀

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Credits

Creator Image

Created by Parul Keshav

National Institute of Technology (NIT), Srinagar

Parul Keshav has created this Formula and 300+ more formulas!

Verifier Image

Verified by Rajat Vishwakarma

University Institute of Technology RGPV (UIT - RGPV), Bhopal

Rajat Vishwakarma has verified this Formula and 400+ more formulas!

Other formulas in Turning Operation category

Go Diameter of Workpiece given Constant for Cylindrical Turning

d = K \cdot \frac{f}{π \cdot L cut}

Go Turning Length given Constant for Cylindrical Turning

L cut = K \cdot \frac{f}{π \cdot d}

See More

How to Evaluate Non-Productive Time in Turning?

Non-Productive Time in Turning evaluator uses Non-Productive Time = ((Basic Setup Time+Number of Tools Used*Setup Time Per Tool)/Batch Size)+Loading And Unloading Time+(Tool Positioning Time Per Operation*Number of Operations) to evaluate the Non-Productive Time, The Non-Productive Time in Turning is the total time wasted in setting up the machine or workpiece for a particular process. Non-Productive Time is denoted by NPT symbol.

How to evaluate Non-Productive Time in Turning using this online evaluator? To use this online evaluator for Non-Productive Time in Turning, enter Basic Setup Time (t_s), Number of Tools Used (N_t), Setup Time Per Tool (t_st), Batch Size (N_b), Loading And Unloading Time (t_ln), Tool Positioning Time Per Operation (t_pt) & Number of Operations (n₀) and hit the calculate button.

FAQs on Non-Productive Time in Turning

What is the formula to find Non-Productive Time in Turning?

The formula of Non-Productive Time in Turning is expressed as Non-Productive Time = ((Basic Setup Time+Number of Tools Used*Setup Time Per Tool)/Batch Size)+Loading And Unloading Time+(Tool Positioning Time Per Operation*Number of Operations). Here is an example- 0.469444 = ((1230+4*600)/3)+30+(90*5).

How to calculate Non-Productive Time in Turning?

With Basic Setup Time (t_s), Number of Tools Used (N_t), Setup Time Per Tool (t_st), Batch Size (N_b), Loading And Unloading Time (t_ln), Tool Positioning Time Per Operation (t_pt) & Number of Operations (n₀) we can find Non-Productive Time in Turning using the formula - Non-Productive Time = ((Basic Setup Time+Number of Tools Used*Setup Time Per Tool)/Batch Size)+Loading And Unloading Time+(Tool Positioning Time Per Operation*Number of Operations).

Can the Non-Productive Time in Turning be negative?

No, the Non-Productive Time in Turning, measured in Time cannot be negative.

Which unit is used to measure Non-Productive Time in Turning?

Non-Productive Time in Turning is usually measured using the Minute[min] for Time. Second[min], Millisecond[min], Microsecond[min] are the few other units in which Non-Productive Time in Turning can be measured.

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