Vise Compensates And Centers With One Turn

Recently, a plant manager (who chooses not to be identified for competitive reasons) needed a machine to produce threaded eyebolts. Thread sizes ranged from 1/2 inch to more than 1 1/4 inch in size.

Columns From: 3/1/2002 Modern Machine Shop,

Recently, a plant manager (who chooses not to be identified for competitive reasons) needed a machine to produce threaded eyebolts. Thread sizes ranged from 1/2 inch to more than 1 1/4 inch in size. The weight of a part ranged from 2 ounces to more than 4 1/2 pounds. The eye ranged from 1 1/2 to almost 5 inches in diameter.

The company supplying the machine was Zagar Inc., a machine tool builder specializing in high-volume holemaking. The company has four main product lines: multiple spindle drill heads, CNC & air/hydraulic feed units, workholding (fixtures & collets) and drilling/tapping machines. The company may be best known for its "crank style" multiple spindle drill heads, which allow for close center distances, placing more rotating tools in a smaller area. Zagar machines are used in the automotive, aerospace, electrical, electronic, propulsion, off-road construction equipment, hydraulic, pneumatic and contract manufacturing industries.

The builder has provided equipment to produce or qualify holes in most ferrous and non-ferrous materials since 1937. The design of the machinery has resulted in the development of stand-alone modular component product lines.

Walter Zagar, vice president, said that while designing a drilling and tapping machine for threading this customer's forgings, his company needed a small vise with special characteristics. After searching unsuccessfully for a vise on the market, the company's engineers decided to build one.

The new vise needed to

  • Center the forging under the cutter
  • Compensate for surface conditions
  • Offer a small footprint for mounting
  • Be mountable on an index table in multiples of six
  • Clamp two forgings at a time
  • Resist torque inherent with producing a 2.00-inch thread
  • Provide ample chip clearance and easy cleaning
  • Be hand-operated, with potential for future automation
  • Be adaptable to existing vise jaws
  • Allow for minimum setup time
  • Be operator-friendly

The resulting vise met these criteria. Both jaws move with one turn of the crank. Thus, it can center and compensate with a single twist of the screw. The movable jaws easily handle two parts. They can be reversed to grip to inside cavities. The clamping area is just over 4 inches square on each side of the screw. It resists the torque, and the open design lets flood coolant wash chips away.

A simple hand crank closes the jaws. The crank can be removed, exposing a hex driver for future automatic operation. Existing jaws are easily mounted. Location is established by a simple key and stud design to hold the jaw in place. Quick changeover and easy chip removal make the vise operator friendly.

The vise fits on a small sub-plate for an index table. The machine was subsequently designed around a six-station concept.

For more information, please contact Zagar Inc. at (216) 731-0500, enter 101 at www.mmsonline.com to visit online showroom, or write 101 on RS card. Please note: This will be my last column. I have enjoyed sharing stories of the successes of our colleagues. But given the economic times we are working in, I need to concentrate on my core business. I may be writing articles in the future, so if you have ideas, please drop me a note. Thank you for allowing me to be a part of your monthly activities.

Comments are reviewed by moderators before they appear to ensure they meet Modern Machine Shop’s submission guidelines.
blog comments powered by Disqus
MMS ONLINE
Channel Partners
  • Techspex