by Matt Trethewey (left)  & John Kwiatkowski (right)Click image to enlargeby Matt Trethewey & John Kwiatkowski 

Tips on how to avoid short feeds

If you listed all the issues reported by stamping manufacturers related to feed equipment, short feeding would be at the top of the list.

If this is not immediately corrected it can cause damage to your die, scrap material, lost revenue and possibly result in late deliveries. To avoid misfeeds and their adverse impact it’s important to understand what causes them and how to fix them.

Avoiding Slippage
Slippage is usually caused by misalignment between the die and feed system. It is crucial when you load and thread a coil into the press that material is centered and square through the feed rolls and die. Make sure you set the die correctly. It should always be centered and square to the press bolster plate.

• Centering: When loading a coil on the reel make sure it is centered on the mandrel. Most mandrels are equipped with 1:2 increment scales with “0” at the centerline. Example: If your coil is 21-inches wide, make sure both edges of the coil are at 21-inches. Also, it’s important to utilize the feed edge guides. They should be against the material on both sides to help guide the material square into the die. Make sure they are calibrated to the center of the die.

• Pilot Release: Feed or pilot release helps thematerial flow square through the die. Pilot release momentarily releases the material so it can align itself by the die’s pilot pins. Momentarily opening the rollers allows for stress in the material caused by camber or slight misalignment to be relieved. The pilot pins correct slight misfeeds by pulling the material into final position. Pilot release timing is critical. If the pins are not engaging the material when released, the material can fall back due to the weight in the loop causing short feeds.

• Support: Lack of support between the feed rolls and die can contribute to short feeding. Without support the material can buckle or sag causing short or long feeds. Also, the feed line height must be set correctly to the die height. If set too high or low, the material will feed uphill or downhill causing drag against the die.

Here are five tips that will help determine the cause of short feeds.

The “One Revolution” test can determine the accuracy of the servo motor. Calculate the roll circumference (roll diameter x 3.1416). Remove material from the feed. Enter the circumference into the feed length. Scribe a line on the driven pulley of the feeder and another line on the side plate for reference. Single stroke the press several times. If the lines match up every time, the scaling parameters are correct. If they do not match, contact the equipment manufacturer for the correct parameters.

Check the pilot timing. Turn the pilot release off then single stroke the press. If this improves accuracy the pilot release press output is not timed correctly.

If excessive roller pressure is required, there may be a slippage problem. Contact the equipment manufacturer for the correct setting.

Use the edge guides to check for an alignment problem. Move the feed edge guides against the material. Cycle the press several times. Check if either guide roller is hard to turn indicating an alignment problem. If the material pushes hard against one of the guide rollers move both edge guides towards the pressure until they turn freely.

Excess following errors or drive faults may indicate the feeder is being overworked due to an alignment problem.

Bottom line: It’s important to take a little extra time to make sure your setup is correct. Dies must be centered and square to the press bolster plate, coil centered on the mandrel, feed edge guides against the material and centered to the die. SMT

Matt Trethewey is a service manager and John Kwiatkowski is a Coe certified manager with Coe Press Equipment Corp.


Ontario equipment maker lands $300 M deal

Niagara, ON, equipment manufacturer Whiting Equipment Canada Inc. has been awarded a multi-million dollar contract to supply salt evaporators and potash crystallizers from VALE for the company's potash plant in Argentina.

Cost savings on abrasives: White Paper

Walter Surface Technologies has publsihed a white paper that illustrates how manufacturers can achieve cost savings with abrasives in metal finishing applications.

Hypertherm opens new waterjet facility

Hypertherm has opened a new 28,000 sq ft manufacturing facility and office in New Brighton, MN, to better service North American customers.

Peter Burrell joins Amada Canada

Peter Burrell has joined Amada Canada, Mississuaga, ON, as sales manager.

He has more than 24 years of experience in the sheet metal fabrication business. He will be based out of the Mississauaga, ON, office.


CMTS 2017

SME Canada, the organizer of the Canadian Manufacturing Technology Show (CMTS) wants to bring attendees an innovative experience like no other in the industry.

Ensuring weld quality

Welding inspectors use many tools and processes to ensure weld quality

As anyone in the fabricating and welding business knows, process and part inspection is a critical component of a successful business.

Reshaping the Future

by Noelle Stapinsky

Diversification and collaboration keep Canada’s tool, die and mould sector healthy and growing

MultiCam Canada open house

October 29 & 30, MultiCam Canada open house in Concord, ON

Vendor reps, live demos and free lunch. Visit MultiCam online for details.

Federal Budget 2017

Anyone looking for specific support for manufacturing in the 2017 Federal Government’s Budget will be disappointed.

Asking the Impossible

by Andrew Brooks

An insistent customer helped Fidelity get used to going above and beyond

A 2 for 1 deal

by Mary Scianna

Punch laser combination machine opens doors to new business

Elias Custom Metal Fabrication Ltd. in Vaughan, ON, has something all custom job shops should have to succeed: owners who consistently invest in technology to diversify and grow.

TRUMPF grows with Chicago expansion

TRUMPF plans to expand its operations with a new 50,000 sq ft facility in Chicago, IL, that will house a Technology Centre and a Centre for Excellence for Industry 4.0. The facility will be completed by mid-2017.

Automating the In-Between

How fabricators are embracing automation to improve process flow in the shop

Manufacturing niche

by Mary Scianna

Focus on tight tolerance, complex work sets BC machine shop apart

Stay In Touch

twitter facebook linkedIn