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At Preferred Centerless, our field of concentration is the centerless grinding of stainless steel, space-aged metals, tool steel, ceramics, plastics and rubber.
We specialize in maintaining high tolerances for the medical, aerospace, defense, power generation, transportation, appliance, industrial and utilities industries where the highest quality and exacting standards are required.
At Preferred Centerless, our years of experience allow us to accurately recommend manufacturing processes that result in the most precise, cost effective and highest quality parts for our valued customers.
Our centerless grinders handle pre-machine to high finish grind operations, using thru-feed, in-feed or profile methods. We can also perform other value-added services on your parts such as heat treating or coatings, etc. Upon request, we will also provide Statistical Process Control (SPC) Reports as well.
No matter your facility location, Preferred Centerless can handle your needs and get your parts to you swiftly - even shipping internationally! Request a quote today and find experience the Preferred Centerless advantage!
Thru-Feed Grinding
Thru-Feed Grinding
The most common type used to grind straight, cylindrical parts that have no heads or other projecting part up to 6.5 inches diameter or 12 feet long.
In thru-feed grinding, the part rotates between the grinding wheel and a regulating wheel as shown.
For thru-feed grinding, one or both wheels of the centerless grinding machine are canted out of the horizontal plane. This imparts a horizontal velocity component to the work piece, so that outside feed mechanisms are not necessary.
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. 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. Thru-feed grinding is primarily a mass-production process because of its high throughput.
In-Feed Grinding
In-Feed Grinding
This is the preferred method when parts have shoulders, heads or irregular shapes and projections that makes thru-feed grinding impossible.
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 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.In-feed grinding is illustrated right.
Because of the set up time involved for each part, in-feed grinding does not have the high throughput of thru-feed grinding.
Profile/End-Feed Grinding
Profile/End-Feed Grinding
This can be a cost saving one step grinding method to replace common multiple step OD grinders when a part has several diameters.
In Profile, or End-Feed Grinding, the part moves in axially between the grinding wheels, stop 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.
Preferred Centerless also makes its own tooling in this regard, so we are able to cut down on lead times and alter diameters as needed!
Crush Grinding
Crush Grinding
Crush grinding is a process of transforming a form among three entities: The grinding wheel copies a defined form from the crush roll and reprints this form onto work pieces. This produces finished parts from hardened blanks in one single operation.
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