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Sample Manipulation and Motion > Rotary Motion > Ferro-Magnetic Solid Shafts > 
Thread Mount Solid Shaft – Ferrotec, Ferro-Magnetic Fluid Rotary Feedthroughs


Thread Mount Solid Shaft – Ferrotec, Ferro-Magnetic Fluid Rotary Feedthroughs

These ferrofluid rotary feedthroughs are sealed by a fluorocarbon o-ring. The operator mounts these drives to the vacuum chamber by screwing them into a corresponding threaded hole, or on some models by placing them in a suitable smooth-sided port in the chamber wall and using a capture nut. Some models are threaded only part way. They will accommodate various wall thicknesses when used with a sleeve or spacer over the unthreaded portion so that the nut compresses the o-ring.

In vacuum practice, the o-ring is compressed against the vacuum chamber’s inner surface to limit virtual leaks. As shown in the dimensional drawings, most ferrofluid feedthroughs are designed to be installed this way. A few, however, are intended to have the o-ring sealing against the air surface.To reduce the virtual leaks associated with the thread, the feedthrough has a flat machined along the length of its threaded portion.

Please refer to the technical notes about loading, temperature, and other relevant information before specifying a feedthrough.

Ferrofluid Feedthrough Features

  • Use a special magnetic fluid (ferrofluid) in place of an o-ring seal around dynamic parts
  • Fluid hermetically seals the shaft making a liquid o-ring while a permanent magnet keeps the fluid in place
  • Ferrofluid magnetically held in stages formed by grooves machined into either the shaft or pole pieces
  • Unlike regular o-rings, the ferrofluid o-ring remains intact for years of operation despite the shaft’s motion

Applications

  • Rotary stages
  • Barrels
  • Platens
  • Planetaries
  • Web coater rollers used in thin film deposition and etching processes
Product Brochure For a Brochure for this product. Please click here.

Dimensional Drawings


Ordering Table

Bearings Shaft O.D. Mount
Flange
Water
Cooled
Face
Oring
PartNo Price Add To
Cart
Bearings Shaft O.D. Mount
Flange
Water
Cooled
Face
Oring
PartNo Price Add To
Cart
R8/SS
0.50" (12.7 mm)
1-14 UNF-2A Thread *
No
O-V128
FE103191 $940.00
R12/SS
0.75" (19 mm)
1-14 UNF-2A Thread *
No
O-V128
FE103193 P.O.R.
R8/SS
0.50" (12.7 mm)
1-14 UNF-2A Thread *
Yes
(0.89", 1.74")
O-V128
FE103204 $1,300.00
R12/SS
0.75" (19 mm)
1-14 UNF-2A Thread *
Yes
(0.89", 1.74")
O-V128
FE103206 $1,420.00
R166/SS
0.1875" (4.76 mm)
5/16-24 UNF-2A Thread
No
O-V012
FE103971 $625.00
R4/SS
0.25" (6.35 mm)
7/16-20 UNF-2A Thread
No
O-V015
FE103978 $710.00

NOTE: * Shaft mount measured 1" from process side face of feedthrough.

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