Productivity News

Volume 19 No. 15
We help you produce more for less!
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Magnetic Workholding Boosts Productivity... 
with faster, repeatable setups
MagVISE Electro-Permanent Magnetic Chucks and MagVISE ECB Permanent Magnetic Vises let you ...
  • Machine 5 sides and through-hole drilling, 
  • Won't lose holding force during a power outage and 
  • Cuts set-up & part changeover time 
MagVISE EEPM Magnetic Chuck and Control                              MagVISE ECB

Magnetic Workholding Features
  • Up to 86,625 lbs. holding power*
  • Turn chuck ON/OFF in only a few seconds - chuck will not lose magnetism if a power loss occurs
  • Induction blocks and subplates provide additional setup options for holding small parts or warped stock
Magnetic Workholding Advantages
  • Machine freely on 5-sides & top so you can cut the full part profile in only 1 operation
  • Reduce setup & part change-over time by 50% or more!
  • Very uniform holding = No workpiece deformation

Use magnetic workholding to speed up drilling, milling, and boring operations on either thick or thin workpieces. Magnetic chucks make setup and part change-over faster and safer, and reduce the number of required operations.Our magnetic chucks easily integrate with pallet changing and tombstone systems used in production cells. Choose magnetic workholding for uniform holding of the workpiece, without part distortion or dead spots. Uniform workholding reduces chatter and harmonics for improved surface finish and tool life.

How it Works
Holding Power ExampleEEPM 3040W chuck (left) has 20 poles, and produces 16,500 ft/lbs of holding power.In the ON state, alnico and rare-earth magnets alternate poles, creating a powerful magnetic attraction. Holding power varies with type of material being held, surface finish, and part thickness.Minimum recommended part size is 5" x 5" x 3/8" thick, so a minimum of 4 magnetic poles are covered by the part. Workstops, pins or part nesting techniques ensure the ability to hold small, thin parts without movement.Induction Blocks & Subplates. We recommend using induction blocks or subplates at all times to preserve the precison ground finish and prevent damage to the face of the magnetic chuck. 

There are 2 ways to get these benefits, with either chucks or vises.
MagVISE ECB Permanent Magnetic Vises or
MagVISE EEPM ElectroPermanent Chuck 

These versatile permanent magnets can be arranged for parts of all sizes, for milling, boring and drilling operations and vertical and horizontal machining. Watch the videos below for an overview of both solutions. 

Magnetic Workholding - EEPM Magnetic Chucks - How They Work - Examples?
Magnetic Workholding - EEPM Magnetic Chucks - How They Work 
Magnetic Workholding - ECB Magnetic Vises - How They Work
Magnetic Workholding - ECB Magnetic Vises - How They Work

MagVISE Electro-Permanent Magnetic Chucks

EEPM Spring Blocks  EEPM chucks eliminate fixtures


MagVISE Electro-Permanent Magnetic Chucks come in 26 sizes from 9" x 17" through 19" x 39". Each chuck comes complete with a controller to easily integrate with manual or CNC machine controls, pallet changing and FMS Systems. Optional pole extensions can accommodate part height variations and serve as part locators or positioning stops.

MagVISE ECB Permanent Magnetic Vises 


MagVISE ECB Permanent Magnetic Vises come in 4 sizes from 5" x 3" through 9.2" x 5.2". Vises require no electricity and are ideal for modular setups and come complete with induction blocks, wrench, extension and socket, switch-connect assembly, 2 stop plates and 4 toe clamps.

Extensive Application Possibilities
       MagVISE EEPM chucks are used for normal and heavy duty drilling, milling, and boring operations on medium or large sized work pieces. Rough and uneven stock is no problem to hold. Simply use the sliding pole extensions to support uneven work pieces. A minimum of 4 alternate poles contact is necessary for optimum magnetic holding power. Minimum thickness of job- 1/2".
       EEPM magnetic workholding chucks drastically reduce set up time for repeat and multiple part jobs. Magnetic chucks maintain uniform holding power over the entire work piece that eliminates vibration and distortion for a better finish and longer tool life. Since work piece distortion does not occur, tool chatter is minimized and surface finish and tool life are improved.
Five Sided Machining:  EEPM chucks fitted with pole extensions will support plates, castings and parts of all shapes while providing clear access for milling cutters on each side and the top surface as well as thru-hole drilling without risk of damaging machine table tops.
          Machining Round Stock: Round stock is readily held and may be quickly positioned with a simple mechanical stop.

          Support for Heavy Side Loads: High permanent magnet holding forces rigidly support workpieces even when applying high side forces during horizontal drilling and heavy edge milling operations. 
          Flood Coolant Hole Making: The sealed permanent magnet chuck design resists down-time due to flood coolant and machine wash-downs.
          Works on Thick and Thin Workpieces: Each chuck can handle large or small, and thick or thin workpieces.
          Machinable Subplates:  Machinable subplates are available to match any permanent magnetic chuck to make repeatable part positioning easy while protecting the chuck surface.

MagVISE Frequently Asked Questions
Why should I consider magnetic workholding?
Compared to traditional fixturing methods, magnetic workholding frees up all five sides of your workpiece so you can machine the entire profile of the part in one set-up. Magnetic workholding greatly reduces set up and part change-over time, giving your spindle more time to make chips.
How long does magnetic workholding take to pay for itself?
Magnetic chucks pay for themselves very quickly because machine up-time and production output are increased. Every case is unique, but in most cases payoff occurs in just a few months.
How does magnetic workholding simplify setups?
Once you have your part(s) indicated on the magnet, change-over only requires turning the magnet on/off to remove and load the parts.
What is magnetic workholding best suited for?
Thick or thin, large or small - just about any ferrous material can be held and machined magnetically. Bigger parts are easier to hold because there is more metal for the magnetism to be attracted to. For smaller parts, using work stops and nesting the part are options that work well. Magnetic workholding is used for just about any type of drilling, milling, and boring operation you can think of, on horizontal or vertical CNC machines.
How do I know magnetic workholding will work for me?
No matter what size parts you cut, we can verify your application on our "test bed" CNC so we can offer you a turn-key workholding solution. We will duplicate your application using magnetic workholding and machine your part to verify the process and document the time savings. All at no risk to you.
Should I get magnetic chucks or magnetic vises?
Magnetic vises have a smaller foot print, and are turned ON/OFF using a manual switch. Magnetic chucks require a controller to turn ON/OFF, but DO NOT require electrical connection to maintain holding power. Magnetic chucks provide more surface contact with the workpiece and feature a greater number of magnetic poles, so they can produce more holding power than magnetic vises. During a power outage magnetic chucks will not lose holding power, so they are just as safe to use as magnetic vises.

         We hope you found this informative and a useful productivity enhancing communication and as always we appreciate your comments.


Frederick J. Oille, P.Eng.
Industry Depot