Main Parts of Milling Machine and their Functions
Points : Main Parts of Milling Machine and their Functions, The column, The Knee, The Table, The Saddle, The Spindle, The Overarm, The Arbor, Arbor Support or Arbor Yoke All the parts of milling machine and However the functions of the main parts are explained in the following lines.
1. The column The column forms main body of the milling machine, providing supports for other parts such as the knee, the saddle and the table. It is a hollow casting with the inner spaces, of the modem machines used to house the driving motor which supplies the power, the gear trains which provides speed changes and several of the spindle motion, and the over-arm which supports the CUTTER ARBOR. The front face of the column is machined to provide a dovetail slide which serves to keep the knee accurately aligned at right angles to the column. The bearing surface, called ways, are usually hand scraped to a high degree of accuracy. 2. The Knee The knee is unit that is attached to the front of the column and is designed to be moved up or down on sliding ways. It also encloses the feed change gearing and attached to it are the controls for operating the feed mechanism. It moves up and down by means of an elevating screw 3. The Table The table is attached to the top of the knee. It may be moved from left to right, and forward and backward. On universal milling machine, the table may also be swiveled 450 to left or right. The table is used to hold the work while it is being machined. The work may be clamped directly to the surface of the table or held in a vice or other devices which, have been attached to the table. On the surface of the table there are Tee-slots which are used to clamp the work holding devices, such as vice, fixtures, dividing head etc. It is made of cast iron. 4. The Saddle The saddle is placed between the table and the knee It has two purposes. First, the dovetailed slide cut in kits underside or underneath engages slide on the top of the knee, and provides the bearing surfaces which guides the saddle in its crosswise movement in reflection to the column of the machine. Second, the longitudinal dovetailed slide in the top of the saddle, which is machined at right angles to the lowered dovetailed slide., provides the bearing surfaces which supports and guides the table in. its lengthwise movement, parallel with the column. 5. The Spindle The spindle is a large shaft that is located in the upper part of the column. In the front end of the spindle is a tapered hole into which may be inserted various cutting tools, and arbors for holding other cutting tools or cutters. 6. The Overarm The overarm mounted and guided on top of the column, is used in plain and universal milling machine. It provides for correct alignment and support of the arbor and various attachments. It is adjustable and may be clamped in any position. The overarm I made of cast iron. 7. The Arbor The milling machine arbor is located in position by means of the tapered portion. It is secured in position with the draw-in bar and is driven by the lugs attached to the face of the spindle. The pilot and bearing sleeve supports the arbor, and the spacing collars locate the centre in position. The arbors are in different styles. 8. Arbor Support or Arbor Yoke The arbor support is a casting which slides and clamps into the ways of the overarm and extends down to the cutter arbor. Its lower end contains a bearing which supports the arbor in one or two ways,. depending on its position on the arbor, the style of arbor used.
Points : Main Parts of Milling Machine and their Functions, The column, The Knee, The Table, The Saddle, The Spindle, The Overarm, The Arbor, Arbor Support or Arbor Yoke All the parts of milling machine and However the functions of the main parts are explained in the following lines.
1. The column The column forms main body of the milling machine, providing supports for other parts such as the knee, the saddle and the table. It is a hollow casting with the inner spaces, of the modem machines used to house the driving motor which supplies the power, the gear trains which provides speed changes and several of the spindle motion, and the over-arm which supports the CUTTER ARBOR. The front face of the column is machined to provide a dovetail slide which serves to keep the knee accurately aligned at right angles to the column. The bearing surface, called ways, are usually hand scraped to a high degree of accuracy. 2. The Knee The knee is unit that is attached to the front of the column and is designed to be moved up or down on sliding ways. It also encloses the feed change gearing and attached to it are the controls for operating the feed mechanism. It moves up and down by means of an elevating screw 3. The Table The table is attached to the top of the knee. It may be moved from left to right, and forward and backward. On universal milling machine, the table may also be swiveled 450 to left or right. The table is used to hold the work while it is being machined. The work may be clamped directly to the surface of the table or held in a vice or other devices which, have been attached to the table. On the surface of the table there are Tee-slots which are used to clamp the work holding devices, such as vice, fixtures, dividing head etc. It is made of cast iron. 4. The Saddle The saddle is placed between the table and the knee It has two purposes. First, the dovetailed slide cut in kits underside or underneath engages slide on the top of the knee, and provides the bearing surfaces which guides the saddle in its crosswise movement in reflection to the column of the machine. Second, the longitudinal dovetailed slide in the top of the saddle, which is machined at right angles to the lowered dovetailed slide., provides the bearing surfaces which supports and guides the table in. its lengthwise movement, parallel with the column. 5. The Spindle The spindle is a large shaft that is located in the upper part of the column. In the front end of the spindle is a tapered hole into which may be inserted various cutting tools, and arbors for holding other cutting tools or cutters. 6. The Overarm The overarm mounted and guided on top of the column, is used in plain and universal milling machine. It provides for correct alignment and support of the arbor and various attachments. It is adjustable and may be clamped in any position. The overarm I made of cast iron. 7. The Arbor The milling machine arbor is located in position by means of the tapered portion. It is secured in position with the draw-in bar and is driven by the lugs attached to the face of the spindle. The pilot and bearing sleeve supports the arbor, and the spacing collars locate the centre in position. The arbors are in different styles. 8. Arbor Support or Arbor Yoke The arbor support is a casting which slides and clamps into the ways of the overarm and extends down to the cutter arbor. Its lower end contains a bearing which supports the arbor in one or two ways,. depending on its position on the arbor, the style of arbor used.
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