make vs buy decision d0394 perancangan sistem manufaktur pertemuan ix - x
TRANSCRIPT
Make vs Buy Decision
D0394 Perancangan Sistem Manufaktur
Pertemuan IX - X
Average Manufacturing CostsAverage Manufacturing Costs
On average, manufacturing firms generate approximately 10% profit from operations.
Typical breakdown of total costs:
Labor (8%)
Materials (50%)*
Overhead costs (32%)
* On average, manufacturing firms spend about 50% of their sales dollar in raw material, component, and supply purchases.
Purchasing Objectives:Purchasing Objectives:
Four Major Objectives of Purchasing:1. Obtain the required quantity and quality of
goods and services
2. Obtain the lowest cost
3. Ensure top notch service and timely delivery
4. Maintain good supplier relationships and Develop potential suppliers
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PurchasingPurchasing
• No longer just order takers….
• Purchasing needs to know– material– performance– availability– suppliers
Purchasing Functions:Purchasing Functions:
• Determine purchasing specifications
(correct quality, quantity, and delivery
requirements)
• Select the right source
• Negotiate terms and conditions
• Issuing and monitoring of purchase orders
Purchasing Cycle:Purchasing Cycle:
1. Receive and analyze purchase requisition
2. Select suppliers
3. Determine the right price
4. Issue purchase orders (PO’s)
5. Monitor PO’s
6. Receiving and accepting goods
7. Approving supplier’s invoice for payment
Purchasing Cycle Step 1:Purchasing Cycle Step 1:
Receive and analyze purchase requisitionMinimum Required Information:
• Identity of requestor, approval, and charge number/account
• Specification
• Quantity and unit of measure
• Required delivery date and place
• Additional supplemental information
Purchasing Cycle Step 2:Purchasing Cycle Step 2:
Select Suppliers• Routine items typically have preferred suppliers
• New/unusual items may require vendor search and RFQ for comparison
Some companies require multiple source solutions (McDonnell-Douglas preferred 3, single source required justification documentation)
• Many firms today are opting for fewer suppliers
• Use of supply chain management is growing
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Supply Chain ManagementSupply Chain Management• Apply a total systems approach to managing the
entire flow of– information– materials– and services
Rawmaterialsuppliers
Factories &warehouses
Endcustomer
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Partnership RelationshipPartnership Relationship
• Continuing relationship involving
– a commitment over an extended time period,
– an exchange of information, and
– an acknowledgement of the risks & rewards of the relationship.
Purchasing Cycle Step 3:Purchasing Cycle Step 3:
Determine the Right Price• Tied directly to supplier selection
• Price negotiation- Focuses on quantity (net and gross)
Frequency of orders
• Total usage “Refunds” are becoming popular
• Supplier maintained inventory (pay as you use
philosophy)
Purchasing Cycle Step 4 & 5:Purchasing Cycle Step 4 & 5:
Issue PO’s and Follow-up POs are legal offers to purchase
Purchasing must follow-up on open PO’s Monitor past due PO’s and critical need
components
Work with suppliers
Take corrective action Expediting components, alternative supply
sources, reschedule production, etc.
Purchasing Cycle Step 6 & 7:Purchasing Cycle Step 6 & 7:
Receiving and Paying Suppliers Reconcile PO’s and receivers
Correct damages, variance or discrepancies
Verify information for payment PO number
Receiving report
Invoice
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OutsourcingOutsourcing• Purchased items account for 60 to 70% of the
cost of goods sold.
• Outsourcing allows firms to focus on their core competencies.– Organizations outsource when they decide to purchase
something they had been making in-house.
• Typically handled by materials management function.
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Make or BuyMake or Buy
• Current trend favors outsourcing all activities that do not directly represent or support core competencies.
• Are there any dangers associated with aggressive outsourcing? What are the implications for JIT production?
Purchasing InputsPurchasing Inputs
• Marketing
• Engineering
• Manufacturing
Functional SpecificationsFunctional Specifications
• By Brand
• By Specification– Physical and Chemical Characteristics– Materials & Methods of Manufacture– Performance
• By Engineering Design
• Miscellaneous– “Gimme one just like the last one”
Good SpecificationsGood Specifications
• Are not to tight or loose
• Allow for multiple sources
• Assign responsibility
Supplier SelectionSupplier Selection
• Types of Sourcing– Sole Source– Multiple Source– Single Source
• Select based on:• Technical Ability• Mfg. Capability• Reliability
• After sale service
• Location
• Price
Four Categories of ProductFour Categories of Product
• Commodities
• Standard Products
• Items of small value
• Make to order items
Purchasing AnatomyPurchasing Anatomy
Purchasing
Procurement
• Specifications• Supplier Selection• Price Determination• Negotiation
Scheduleand
Follow up
• Order Release • Schedule Delivery• Follow up
Price DeterminationPrice Determination
“you get what you paid for”• Fair Price- One that is competitive, gives the
seller and buyer an opportunity for profit• Fixed Costs- Costs incurred without respect to
sales volume• Variable Costs- Costs directly associated
with sales volume (labor, material, etc.)• Breakeven Point- The convergence of profit
and loss. . . financial equilibrium
Break-Even ExampleBreak-Even ExampleQ:To make a particular component requires an overhead (fixed)
cost of $5000 and a variable unit cost of $6.50/unit. What is the total cost and the average cost of producing a lot of 1000? If the selling price is $15/unit, what is the break-even point?
A: Total cost = fixed cost + (variable cost/unit)(# of units) = $5000 + ($6.5 x 1000) = $11,500 Average cost = Total cost / # of units = $11,500 / 1000 = $11.50/unit Break-even point: Let X = # of units sold $15X = $5000 + $6.5X $8.5X = $5000 X = $5000 / $8.5 = 588.2 units