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12690 Elmwood Ave.
Cleveland, OH 44111
Phone: 1-216-749-3320


Thru Feed Grind:
bullet Single diameter parts

.050 through 4" diameter


Lengths from 1/4" and up


Diameter tolerances to .0002


Surface finishes to 4 micro inch


Infeed Grind:

Multi-Step parts grinding up to a shoulder


.050 through 4" diameter


Lengths from 1/4" to 10"


Diameter tolerances to .0002


Surface finishes to 4 micro inch

Three Main Types of Grinding

Centerless grinding is similar to centered grinding except that there is no spindle. This allows high through-put since parts can be quickly inserted and removed from the process. There are three main types of centerless grinding:

  1. Through-feed grinding.

  2. In-feed grinding.

  3. End-feed grinding.

Through-Feed Grinding

In through-feed grinding, the part rotates between the grinding wheel and a regulating wheel as shown below.


through-feed grinding

For through-feed grinding, one or both wheels of the centerless grinding machine are canted out of the horizontal plane, as shown below. This imparts a horizontal velocity component to the work piece, so that outside feed mechanisms are not necessary.

centerless grinding machine

The grinding wheel is canted with respect to the other two axes so that a component of its surface velocity pushes the part in the direction shown below. This auto feeding characteristic is useful for rapidly processing many parts in quick sequence.
Because of the axial movement, through-feed parts can only have right circular cylindrical ground surfaces. The wheel cannot be dressed to grind more complex shapes.
Below are parts produced with the through-feed centerless grinding process. As can be seen from the quantities produced, through-feed grinding is primarily a mass-production process because of its high throughput.


through feed centerless grinding process

In-Feed Grinding

In-feed grinding differs from through-feed grinding in that the part is not fed axially so that the ground surface does not need to be a right circular cylinder. The grinding wheel can be dressed to accommodate the part. Once the work piece part is in place, the grinding wheel is fed in radially.
Because of the set up time involved for each part, in-feed grinding does not have the high throughput of through-feed grinding. In-feed grinding is illustrated below.

infeed only

End-Feed Grinding

thru and infeed grind services

In end-feed grinding, the part moves in axially between the grinding wheels, stops for grinding, and then moves out again. The wheel can be dressed to form more complex shapes, but the part can only get progressively smaller in diameter. End-feed grinding is illustrated below.


grinding wheel and regulating wheel

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Advanced Secondaries specializing in secondary operations, broaching, drilling, tapping, shaving and grinding.


horizontal rule

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