Total Machining Time using Total Production Cost Calculator

Total Machining Time Formula:

\[ t_m = \frac{C_{tp} - (T_{npc} + C_{ct} + C_t)}{C} \]

Total Production Cost (C_tp):

Total Non Productive Cost (T_npc):

Total Tool Changing Cost (C_ct):

Total Cost of Tools Used (C_t):

Cost of a Tool (C):

Total Machining Time (t_m):

1. What is Total Machining Time using Total Production Cost?

Definition: This calculator estimates the total machining time based on production costs, non-productive costs, tool changing costs, and tool costs.

Purpose: It helps manufacturing professionals determine the actual time spent machining parts after accounting for various cost factors.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ t_m = \frac{C_{tp} - (T_{npc} + C_{ct} + C_t)}{C} \]

Where:

\( t_m \) — Total machining time
\( C_{tp} \) — Total production cost
\( T_{npc} \) — Total non-productive cost
\( C_{ct} \) — Total tool changing cost
\( C_t \) — Total cost of tools used
\( C \) — Cost of a single tool

Explanation: The formula subtracts non-machining costs from total production cost, then divides by tool cost to determine machining time.

3. Importance of Machining Time Calculation

Details: Accurate machining time estimation helps in production planning, cost control, and efficiency improvement.

4. Using the Calculator

Tips: Enter all cost values in percentage terms. The calculator will compute the total machining time based on these inputs.

5. Frequently Asked Questions (FAQ)

Q1: What constitutes non-productive costs?
A: Non-productive costs include setup time, inspection, and other activities that don't directly contribute to machining.

Q2: How is tool changing cost calculated?
A: It includes both the direct cost of changing tools and the associated downtime costs.

Q3: Why use percentage values?
A: Percentage values allow for standardized comparison across different production scenarios.

Q4: What affects the cost of a tool?
A: Tool cost includes purchase price, maintenance, sharpening, and expected life.

Q5: How can I reduce machining time?
A: Optimize tool paths, use better tooling, reduce setup times, and minimize non-productive activities.