It is wrong to use inaccurate data or rely on outdated information that doesn’t match the specific tool in use. Ensure the cutting tool data is verified and maintain an up-to-date database of your machine tools’ specifications. You can also document cutting data of successful previous operations.

The system will also record the Supplier's confirmation number in the "Supplier Order#" field on the PO and records the Repair Order number in the "PO Comments" field on the PO.  The PO number also gets recorded on the Item detail line on the Repair Order and is used as identification for Accrued Payables.  Once "Sent", the system will not allow any additions, changes or deletions to the PO.

The system automatically compares both the Cost and the Selling prices of each Item on the Repair Order with the Cost and Suggested Selling price that is returned by the Supplier's system.  When any price differs, a dialog box will be displayed informing the user that the "Prices have been changed", and that "Item number xxx has been re-priced $X to $Y".  The system automatically re-prices both the "Selling" & "Cost" of the Item on the Repair Order and the "List" & "Net" Selling prices in your Inventory file.  A checkbox in Supplier Maintenance controls the automatic changing of your net price (Retail selling price) in your Inventory when a "check supplier" returns a new price from that supplier.  If net price changes are prevented, then only your List price (MSL) will change (unless your List and Net price columns in Order Entry Options are the same).  If net price changes are allowed your net price is set to the price returned from supplier.  However, if a Gross Margin % markup is set in the item's product type the system will set the new net price based upon a cost-up calculation.

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Besides, proper SFM helps ensure the appropriate performance of CNC tools. As such, SFM ensures the smooth transitioning of operations and enhanced quality products. While raw materials have varying machinability ratings, SFM significantly determines a material’s machinability and the tools’ hardness. It ensures machinists use the appropriate tools for the workpiece material, minimizing wear and tear.

For Suppliers whose connection type is "Blank (Print)", "E-mail", "Fax", or "XML"  a "Delivery Methods Dialogue Box" will be presented and the Supplier's default delivery method will be displayed.  If the Supplier Connection Type is XML, no change in delivery method is allowed.  If the Supplier Connection Type is not set to XML, the user will not be allowed to change the delivery method to XML using the "Delivery Methods Dialogue Box".  However, if the Supplier Connection Type is blank, e-mail, or fax, the user may change the default delivery method.

However, not many people really know the intricacies of this term. Understanding how SFM works is essential before using any machining process. Each CNC tool has its set speeds and feeds. Hence, adhering to them helps ensure a smooth machining process.

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Incorrect SFM settings can have significant effects on tool life and the quality of machining. Understanding what happens if the SFM is too low or too high will help maintain an efficient and precise machining process:

If you wish to add an item to an existing PO, (which has not been sent), click the down arrow on the "Put on PO" column, which will display a list of existing Purchase Orders.  Click the PO number in the list that you wish to use and that existing PO number will be assigned to the item.  Next, click the "Place Order (s)" button and the item (s) will be placed on the existing Purchase Order (s).

Not accounting for tool wear can reduce the cutting performance and influence the SFM needed. Following the tool manufacturer’s guidelines on tool life and wear rates would be best. You should also inspect the cutting tool regularly for wear and adjust the SFM accordingly.

Any Item that does not exist on the Supplier's system will display the message "Not Found" and display zeros under the "Available quantity" and "prices".  These Items will not be ordered from the Supplier.

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If the Supplier is a "COSTAR Electronic Trading Partner" the Stock Status Display also shows the results of an On-line Supplier Stock Check.  Available quantity at the Supplier's location, your Item Unit Cost from that Supplier, the Suppliers Unit Suggested Selling Price and the Item Unit Core Cost (if applicable), are automatically returned from the Supplier's Inventory system and displayed on line 2 of the Item.  Any Alternate Items and Supersession Items, that are available from that Supplier's system, will also be displayed.  If the Supplier is not a "COSTAR Electronic Trading Partner", the message "Can't connect" will be displayed on line 2 of the Item.

Once you know the desired surface speed/SFM for a specific tool or material, these formulas help decide the required spindle speed (RPM). Below is how to convert SFM to RPM:

In the modern machining industry, surface speed calculators are invaluable tools that help prevent human error and ensure desired outcomes. Machinists can input spindle speed (rpm) and cutter diameter (D) in these devices and software applications to determine the best SFM for machining operations. Typical SFM calculation tools and software include:

You might make significant errors in SFM calculation, which may affect the outcomes of your project if you aren’t careful enough. Here are some of the common pitfalls machinists and engineers encounter when calculating SFM and how best to avoid them:

Purchase Order creation sequence:  Suppliers that utilize the "Delivery Methods Dialogue Box" will be processed first, followed by Suppliers that utilize the "Send PO" delivery method.  The "Sent" box, on the "Stock Status" display, will be checked as the user clicks OK to the delivery method.

The fist line displays the Item number, Description, Size and Required, On-Hand, On Order, Committed and Available Quantities in your Inventory System.  If the quantity required exceeds the quantity available, the system will suggest a order by placing the difference in the Total Order column and displays the word "Auto" in the "Put on PO" column.

SFM (Surface Feet per Minute) is a critical parameter in CNC machining processes that determines cutting head speed/velocity relative to the raw material. SFM entails surface speed and the unit feet per minute. It matches the spindle speed (RPM) with the rotating component’s diameter to determine the optimal cutting condition.

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Taking recommended SFM values from tool manufacturers without evaluating the specific setup or material is a common mistake in SFM calculation. It would help to take manufacturers’ recommendations as a starting point and optimize SFM and RPM values/settings according to cutting conditions to ensure overall machining efficiency.

From AT-Machining, I’m a CNC Machining Expert in this field for more than 20 years.  We offer cost-effective machining services from China. Ask for a quote for your ongoing or upcoming projects now!

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To learn more on how to set up Lost Sale Reasons and how to obtain a report on Lost Sale Reasons, refer to "Inventory, Reason Code Maintenance" and "Inventory, Inventory Reports, Operating Reports, Reason Code Activity Report".

Setting the correct SFM in machining operations ensures optimal tool performance, reduced tool wear, and superior quality finished products. Since different materials and processes require varying cutting speeds, a comprehensive understanding of calculating the best Surface Feet per Minute for your project is essential to achieving desired outcomes.

This article explains everything you need to know about SFM machining, its importance, and the standard units used in measuring SFM. Read on to the end to discover common mistakes in measuring SFM and how to avoid them. Let’s get to it!

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The Invoice, Repair Order and Quotation documents, in the Order Entry menu, all contain a "Check Stock" button located on the bottom of the entry form.  This function allows you to check for availability, pricing and placing of orders via the Internet for each Supplier including those Suppliers which COSTAR has developed an Internet based Ordering System.

The principal agenda of SFM is to attain efficient material removal and ensure an extended tool life span. While low SFM can reduce heat generated by machining operations and preserve tool life, high SFM increases production rates but generates extreme heat, resulting in rapid tool wear.

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Machinists may fail to convert units correctly or confuse inches and feet when using the SFM formula. However, it would be best to use a machining software or calculator that can automatically convert the units to avoid human error. Also, it would help always to ensure diameters are indicated in inches and speeds are in revolutions per minute (RPM)

TiN, TiAlN, and other Coatings are commonly used to enhance cutting tool performance by reducing friction and increasing resistance to heat. Coated CNC tools can withstand higher SFM, unlike uncoated tools.

Although closely related, SFM (Surface Feet per Minute) differs from RPM (Revolution per Minute) because they represent different things. SFM calculates the linear speed of the tool’s cutting edge relative to the workpiece, while RPM measures the spindle’s rotational speed. The cutter diameter determines the relationship between the SFM and RPM. Machinists can convert RPM to SFM using the formula:

SFM settings can vary significantly according to materials. The material’s hardness, machinability, and thermal properties would determine the best SFM value for machining operation. Below is a guide on how to adjust SFM for different materials:

These formulas help you determine SFM (Surface Feet per Minute) when you already know the spindle speed (RPM) but need to determine the surface speed (SFM).

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Note the "Select" column at the start of each line.  A box that is checked indicates that you wish to retain that Item on your Repair Order and that you wish to Order the Item (if required) from the Supplier selected on that line.  Removing the Check Mark in the Select box will result in the Item being removed from both the "Stock Status" form and the Repair Order when the "Stock Status" form is closed.  Selecting an Alternate or Supersession Item will result in the original Item being replaced on both the "Stock Status" form and the Repair Order when the "Stock Status" form is closed.  Clicking the "Cancel" button will close the form and leave the Stock Status and the Repair Order unchanged.

The second line displays Retail Price,  Sale Price, Core Price, Package Description (Case, Roll, etc.), Quantities per Package and Part Cost.  Cost is suppressed and may be displayed via PIN Security.

SFM is a critical variable that determines the outcomes of machining processes. It significantly impacts the cutting tool’s performance and the final product’s quality. However, SFM helps identify the ideal tool speed for various materials by deciding the appropriate (RPM) for machining cuts. Understanding the appropriate RPM helps machine operators achieve precise and efficient cuts during machining.

To automatically generate newPurchase Orders for the items with quantities showing in the Order column, click the "Place Order (s)" button.  The system will automatically create a new Purchase Order for each Supplier and present the user with a delivery dialogue box for each Purchase Order.  "Supplier Connection Type" in "Supplier Maintenance" determines the type of the delivery dialogue box.

"Checking the Supplier" function is only valid for Suppliers that are defined as a "COSTAR  Electronic Trading Partner".  These are Suppliers that COSTAR has developed an integrated Internet based Inquiry and Ordering capability.

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Feet per minute (FM) and millimeters per minute (MM/min) are two primary units product teams use to calculate SFM. Although these units express surface speed, their application is based on the region and the adopted standard measurement system.

Furthermore, proper SFM settings help mitigate common issues like the deformation of the workpiece and tool skipping during machining processes. SFM calculation helps machinists prevent cutting tools from skipping across the workpiece, causing defects or damage to the cutting tool. Additionally, incorrect SFM calculation can cause excessive heat that may affect the workpiece. Therefore, proper SFM settings help ensure the workpiece retains its intended form and properties.

The "Check Stock"  feature reviews all of the products on the Order Entry document and presents the user with a "Check Stock" screen.

These formulas serve different purposes. Therefore, understanding and incorporating each in your CNC machining operation can offer extensive benefits, including:

Note:  This automatic re-pricing feature for the entire system can be turned off via a setting on the "Integration Tab" in Order Entry Options, Apply Supplier list price changes automatically".

When calculating SFM, it is wrong to use generic values that don’t account for the machined material since different machining materials require varying SFM due to parameters like thermal properties, hardness, and tensile strength. Experts advise using SFM values of the material being machined.

Machinists can easily determine the best cutting speeds in machining operations by calculating  Surface Feet per minute (SFM). Doing so helps to ensure better tool life, efficient material removal, and superior workpiece surface finish. Below is an example of how to calculate SFM in CNC machining:

The choice of CNC tools employed for machining operations often influences SFM calculation and application. Due to the variation in the capabilities and requirements of cutting tools, CNC tools often influence the optimal SFM for a specific operation. Here is how CNC tools Influence SFM in machining:

For Suppliers whose connection type is a "COSTAR Electronic Trading Partner" (e.g. NAPA, AconneX), a "Send POs" delivery dialogue box will be presented.  No change in delivery method is allowed.

FPM is a common standard unit used in determining SFM. It easily conforms to other imperial measurements. Machine operators working with CNC machines in the U.S. know this measurement unit. However, the feed per minute unit requires conversion before it can be suitable for international use. Also, it is a less intuitive unit for those used to the metric system.

When checking stock, from a COSTAR Retail store to COSTAR Wholesale using the Check Supplier function, and a duplicate Retail Store item number is found in the Wholesale Supplier numbers, a list of the duplicates will be presented to the ordering retail store.  Once the selection has been made, the Wholesalers Item number, for the duplicate supplier number selected, will be used to update the Retail Store's Supplier Item number in their Inventory record.  Duplicate Supplier items occur when the wholesaler creates their own Item numbers and has multiple Suppliers using the same Item number.

Using the formula Vc = n × π × D / 12, you can determine the cutting head if the spindle speed (n) is 3000 RPM and Diameter (d) is 1.8 inches.

Millimeter per minute is a standard unit in international and metric-based systems. It aligns with global manufacturing practices and facilitates seamless integration with metric specifications. However, MM/min unit may require conversion before machinists in the U.S. can use it. It is also a less familiar SFM measuring unit to machinists accustomed to the imperial system.