Formtek
  • About Formtek
    • Brands
    • Solutions
    • Industries Served
    • News and Updates
    • Service and Support
  • Products
  • Resources
    • Video
    • E-Books & White Papers
    • Catalogs & Brochures
    • The Formtek Blog
    • Formtek Talks
  • News
    • The Latest News & Updates
    • The Formtek Blog
    • Subscribe for Updates
  • Contact Us
Cart
  • About Formtek
    • About Formtek
    • Brands
    • Solutions
    • Industries Served
    • Service and Support
  • Products
  • Resources
  • Contact Us
  • B&K
    • B&K Home
    • Products
    • Solutions
    • Industries
    • About B&K
    • Contact B&K
  • Dahlstrom
    • Dahlstrom Home
    • Products
    • Solutions
    • Industries
    • About Dahlstrom
    • Contact Dahlstrom
  • Hill Engineering
    • HE Home
    • Products
    • Solutions
    • Industries
    • About HE
    • Contact HE
  • Lockformer Custom Machinery
    • LCM Home
    • Products
    • Solutions
    • Industries
    • About LCM
    • Contact LCM
  • Tishken
    • Tishken Home
    • Products
    • Solutions
    • Industries
    • About Tisken
    • Contact Tishken
  • Winpro
    • Winpro Home
    • Products
    • Solutions
    • Industries
    • About Winpro
    • Contact Winpro
  • Yoder
    • Yoder Home
    • Products
    • Solutions
    • Industries
    • About Yoder
    • Contact Yoder
  • B&K
    • B&K Home
    • Products
    • Solutions
    • Industries
    • Videos
    • About B&K
    • Contact B&K
  • Dahlstrom
    • Dahlstrom Home
    • Products
    • Solutions
    • Industries
    • Videos
    • About Dahlstrom
    • Contact Dahlstrom
  • Hill Engineering
    • Hill Engineering Home
    • Products
    • Solutions
    • Industries
    • Videos
    • About HE
    • Contact HE
  • Lockformer Custom Machinery
    • LCM Home
    • Products
    • Solutions
    • Industries
    • Videos
    • About LCM
    • Contact LCM
  • Tishken
    • Tishken Home
    • Products
    • Solutions
    • Industries
    • Videos
    • About Tishken
    • Contact Tishken
  • Winpro
    • Winpro Home
    • Products
    • Solutions
    • Industries
    • Videos
    • About Winpro
    • Contact Winpro
  • Yoder
    • Yoder Home
    • Products
    • Solutions
    • Industries
    • Videos
    • About Yoder
    • Contact Yoder
Get quote

Get a Quote

Contact Us

Contact Us

Pre-Cut and Post-Cut In the Roll Former

November 4, 2021 | by Brian Kopack
Several roll forming aspects affect the decision between running a pre-cut vs. post-cut system. What do we do different in the roll former?
 

Pre-Cut vs. Post-Cut Roll Forming System Design

Usually in the roll former, if you're running pre-cut, there are more forming stations. The rule of thumb is 25% more forming stations than if your operation runs from coil. That's because as you form the part, you can't move it as quickly, and it will want to open as it goes into each station. So it takes more of it to take a set, to minimize flare. 

Typically, throughput is greater on post-cut than it is pre-cut because in pre-cut, you're pulling gaps between the parts. The mill is running at 80 feet a minute, but your operation is not getting 80 feet a minute worth of product.

Additionally, a shop may not want to spend the money for a whole pre-cut front end line of the uncoiler and feeder system. If the lengths are not 20 foot lengths, just hand feeding shorter lengths into the roll former can be a simple way to initially get into roll forming, say, from a press brake operation.

Consider the shape and size of the parts you are roll forming.

If you have long parts, it's not a question. It comes down to your shortest part. Longer parts need more space on the front end; the smallest part you have to be in two driven stands at any given time. Three horizontal centers of your machine is usually the minimum requirement.

There are creative ways around this. You can make tab parts so that you can essentially run a longer part through, break it off, and then you get the two parts that you need. But in general, most shops can't live with that because you'll have dimples and other imperfections on the end of a tabbed part. This depends on the application. The other thing that determines pre-cut versus post-cut is the ability to cut the part off in a reasonable way without adding a bunch of pre-notching or other things. The part itself may dictate pre-cut versus post-cut.

If you look at the part geometry in box shelving, as an example, that's always pre-cut. It's not common to see a box shelf line that's a post-cut because of the width of the part and the geometry of the part. The shape of the part generally determines what the cost of a post-cut could be compared to something done with a pre-cut. The downside with pre-cut is adding more stands to try to eliminate some of the flare, but there tends to be more flare than in a post-cut system. If a shop is pre-notching something in a pre-cut system, it's usually better to have a post-cut system to control it through the whole roll former.

Want to learn more about pre-cut vs. post-cut roll forming and which could be best for your business? Read, watch, or listen to our podcast episode on the topic right here.

Tags: Roll Forming, Cutting Systems
Back to Blog
  • Tweet

Related Articles

Is Pre-Cut or Post-Cut Roll Forming Best?

Fabricators might be wondering if there is a definitive answer: which is better, pre-cut or...
Read More

Pre-Cut vs. Post-Cut Roll Forming

A common question manufacturers face when starting or upgrading their roll forming processes...
Read More

Slug Type vs. Slugless Cut-Off Dies in Roll Forming

Choosing the correct presses, tooling, and dies can be the key to a more productive and successful...
Read More
WE’RE HERE TO HELP

Have questions about our machinery and equipment? Looking for a solution to address a particular application? Looking to improve the overall productivity and profitability of your operation? Please don't hesitate to reach out or schedule a no obligation, 1-on-1 consultation with a Formtek Technical Specialist — we'd love to help.

Contact us
1-on-1 Consulation
  • Formtek
    • About
    • Brands
    • Industries Served
    • Solutions
    • Services and Support
    • News & Updates
    • Products
    • Resources
    • Formtek Talks
    • Contact Us
  • B&K
    • B&K Home
    • Products
    • Solutions
    • Industries
    • Videos
    • About B&K
    • Contact B&K
  • Dahlstrom
    • Dahlstrom Home
    • Products
    • Solutions
    • Industries
    • Videos
    • About Dahlstrom
    • Contact Dahlstrom
  • Hill Engineering
    • Hill Engineering Home
    • Products
    • Solutions
    • Industries
    • Videos
    • About HE
    • Contact HE
  • Lockformer Custom Machinery
    • Lockformer CM Home
    • Products
    • Solutions
    • Industries
    • Videos
    • About LCM
    • Contact LCM
  • Tishken
    • Tishken Home
    • Products
    • Solutions
    • Industries
    • Videos
    • About Tishken
    • Contact Tishken
  • Winpro
    • Winpro Home
    • Products
    • Solutions
    • Industries
    • Videos
    • About Winpro
    • Contact Winpro
  • Yoder
    • Yoder Home
    • Products
    • Solutions
    • Industries
    • Videos
    • About Yoder
    • Contact Yoder

Warranty   Terms & Conditions