![]() Just like in an open side planer, the columns support the cross rail on which one or more tool heads are mounted. A double column planer has two columns, one on either side of the bed and the worktable. Width of the parts that can be machined in a single column planer is larger owing to the configuration of the machine. The open side planer, also called as the single column planer has a single column supporting the cross rail on which the tool head is mounted. Planing machines can be classified into two types as open side planers and double-column planers. The clearance angle of the tool also must be bigger to avoid plunging of the cutting tool into the machined surface during the quick return of the ram over the work piece. Also higher tool rigidity is required to withstand the higher impact cutting forces. The only difference is that the cutting tool for planing must be more rigid as the tool is not subjected to any kind of reciprocatory motion and just feed motion. Just like the ones used in turning process, the cutting tool used for material removal is a single point cutting tool. The tool head which holds the cutting tools can be moved horizontally along the cross rail by screw nut system and the cross rail is supported by the column of the machine. ![]() This kind of arrangement not only enables to change the number of stroke per minute but is also responsible for the quick return of the table thus reducing the time taken for the return stroke. The rack is fitted with the table at its bottom surface and the pinion is fitted on the output shaft of the speed gear box. The reciprocation of the table, which imparts cutting motion to the job, is attained by the rack and pinion mechanism. The planing machine has a relatively simpler kinematic system which enables the transmission and transformation of rotary motion of the main motor into reciprocating motion of the large work table and the slow transverse feed motions (both horizontal and vertical) of the tools. The quick interchange of the table increase the number of strokes per minute A metal power planer machine is also more productive than a shaping machine. When compared to shaping machines, planer machines are much larger and more rugged in construction and are generally used for machining large jobs with longer stroke length and heavy cuts. In planing machine, instead of the tool, the work piece is given a reciprocatory action thereby responsible for the fast cutting motion and instead of the job, the tool is given the slow feed motion while in shaping machines, it is vice versa. Even though there are striking similarities between the two processes, there are a few notable differences between the two of them. Also most importantly both the machining processes work based on the same cutting principle. For machining grooves in curved sections, form tools are utilized in both the machines. Both shaping and planing machines can also be exploited to produce large curved surfaces by employing suitable attachments. As in shaping machines, during the planing process as well the length and position of the stroke can be adjusted and only single point cutting tools are used for material removal. ![]() Like shaping machines, planing machines are also basically used for producing flat surfaces in various planes. The stroke movement can be adjusted when the planing machines are at work
0 Comments
Leave a Reply. |