Reference point returns instruction G27, G28, G29, G30 -- CNC Milling process designing

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  • source:DDON CNC Machining
Headline: Reference point returns instruction G27, G28, G29, G30 -- reference point of machine tool of CNC Milling process designing is OK of aleatoric set, the position of set basically is machined according to the machine tool or change the need of the knife. The method of set has two kinds: In waiting for coordinate position to stock parameter according to dot of the some on arbor or cutting tool point of a knife namely firstly, come reference point of set machine tool: Make the each corresponding on the machine tool place that block iron with tone secondly, OK also reference point of set machine tool. General reference point chooses machine reference point to return instruction G27, G28, G29, G30 -- reference point of machine tool of CNC Milling process designing is OK of aleatoric set, the position of set basically is machined according to the machine tool or change the need of the knife. The method of set has two kinds: In waiting for coordinate position to stock parameter according to dot of the some on arbor or cutting tool point of a knife namely firstly, come reference point of set machine tool: Make the each corresponding on the machine tool place that block iron with tone secondly, OK also reference point of set machine tool. General reference point chooses the origin of machine tool coordinate, move in use hand when returning reference point function, cutting tool can locate in reference point of coordinate of machine tool X, Y, Z, return reference point indicator light to shine at this moment, show cutting tool is in the reference point position of the machine tool. (1) return function of reference point desired result (this function in G27) program, use at checking a machine tool whether can accurate return reference point. Format: G27 X____ Y____ : After executive G27 dictates, return indicator light of each axis reference point to illume respectively. When use cutting tool compensates a function, indicator light is not bright, after cancelling cutting tool to compensate a function so, ability uses G27 to dictate. Should return block of function of reference point desired result to finish, when need makes mechanical system stops, m00 must increase after next block or the auxiliary function such as M01 or move below single block circumstance. (2) returns reference point automatically (G28) uses this statement, can make controlled axis returns reference point automatically. Format: G28 X____ Y____ : Or G28 Z____ X____ ; Or G28 Y____ Z____ ; Among them X, Y, Z is coordinate of intermediate spot position, after the instruction is carried out, all controlled axes reach fast fixed position intermediate dot, arrive from the dot intermediate again next reference point. G28 instruction is used at changing a knife automatically commonly, when so use G28 dictates, should cancel the compensation function of cutting tool. (3) returns automatically from reference point (the form that G29) returns instruction G29 automatically from reference point is: G29 X____ Y____ ; Or G29 Z____ X____ ; Or G29 Y____ Z____ ; This dictates general follow closely is used after G28 dictates, value of coordinate of the X in the instruction, Y, Z is to carry out G29 hind, the coordinate that cutting tool should arrive at is nodded. Its behavioral order is the intermediate point that reachs G28 instruction quickly from reference point, move to locate to the dot that G29 dictates from the dot intermediate again, its movement and G00 act are same (4) the 2nd reference point returns G30 instruction G30 X____ Y____ ; Or G30 Z____ X____ ; Or G30 Y____ Z____ ; G30 is returned for the 2nd reference point, this function and G28 statement are similar. Different point is cutting tool returns the 2nd reference point automatically, and the position of the 2nd reference point is come by parameter of set, g30 instruction is carrying out the ability after returning the first reference point effective. If G29 statement follows directly at the back of G30 instruction, criterion cutting tool appoints by G30 (the reentry point fixed position that the intermediate site that coordinate value is X, Y, Z) changes to dictate to G29, be similar to instruction of G28 heel G29. Normally G30 instruction is used at changing the situation with knife position and different reference point automatically, and before using G30, answer to cancel cutting tool to compensate first euqally with G28. CNC Milling