1233383 玖、發明說明： 【發明所屬之技術領域】 本發明係關於一種數值控制機械，尤指一種適用於可 進行刀具之偏擺磨耗補償之數值控制機械，例如電腦數值 5 控制成型機、電腦數值控制鑽孔機等。 【先前技術】 於一般之數值控制機械（Numerical Control, Nc)中，例 如成型機、或是鑽孔機等，其係以所謂之刀具對於一工件 1〇進行切削加工，例如對一電路母板進行切削以得到複數個 電路板（PCB)。 請參閱圖1係習知電路母板之加工示意圖，其顯示有 一電路母板91，且於此電路母板91上欲切削出十二個相 15 同大小之電路板（編號卜⑴，前述之加工方式係為傳統 所稱之「翻版」。 請同時參閱圖丨、及圖2係習知第一次加工之數值控 制程式之示意圖，因一般刀具92本身即具有一直徑D，： 此於進行切削時，必須於數值控制程式内加入刀具％直徑 D (或是半徑）之數值，並以該數值為切削時之補償量^ 2〇如此於切削時方可得出十二個相同大小之電路板（編號 1〜12)，此如圖2所示，於”T1，，之指令之後面將刀具…之 直徑D設定為1.0。 又當前 一電路母板91之十二個電路板切削完成之 1233383 後，即可進行下一電路母板91之切削，請參閱圖3係習知 第二次加工之數值控制程式之示意圖，此時，由於刀具92 於先鈾進行切削之後，其本身即會產生磨耗，故於進行下 一電路母板92之切削之前，使用者必須依照個人之經驗而 5去更改數值控制程式中刀具92之直徑D補償量之數值， 如圖3所示係將刀具92之直徑D設定為〇·8 (此係因刀具 92磨耗而使其直徑D變小），並以此數值為其補償量以進 行下一電路母板92之十二個電路板之切削。 請再回參圖1，然而，當刀具92於切削前一電路母板 10 92之編號1之電路板之後，刀具92本身即已產生磨耗， 同樣的，於切削每一電路板之後，刀具92本身之磨耗會逐 漸增加’若以上述習知之補償方式，則必須於十二個電路 板皆完成切削之後，方可進行刀具92補償量之更改設定， 如此對於已切削完成之十二個電路板而言，其便會具有不 15同之大小而發生編號12之電路板之尺寸大於編號U之電 路板之尺寸，並依此類推，故因而大大影響產品之精度。 此外，請參閱圖4係習知刀具於旋轉狀態下所產生之 偏擺示意圖，當使用習知刀具92進行加工時，刀具92本 身亦會因為旋轉而產生微量之偏擺，如此亦會造成切削量 20 之誤差而導致產品精度受到影響。 【發明内容】 / 6 #本發明之主要目的係在提供一種數值控制機械，俾能 =二刀具補償法則以隨時進行刀具補償量之設定，並藉 从提高加工完成後之產品精度。 9 〜為達成上述目的，本發明之數值控制機械主要包括有 载物平σ、一旋轉刀具、一記憶體、一刀、 及-數值控制器。Μ，於載物平台上固定有一工 疋轉刀具則包括有一内部之中央軸線、以及一外部之有效 刀徑，且此旋轉刀具係沿其中央軸線持續旋轉。 / 此外，於記憶體内儲存有一數值控制程式，此數值控 程式包括有一副程式其係被呼叫並執行至少二次，而此 2㈣$義有-實體外形路徑’ a此副程式並使用上述 二I刀具之有效刀徑以代人演算，並將前述之實體外形路 ⑽專換成—補正路徑，同時副程式並計算旋轉刀具之中央 車線相對於載物平台上之工件的移行距離、並予以累加而 輸出一累進切削長度。 另外，刀徑貢料庫内儲存有複數筆刀徑記錄其係分別 於不同碇轉刀具，每一筆刀徑記錄包括有複數個磨後 =效^其係分別對應於不同之累進切削長度。至於數值 抆制2則係能執行上述記憶體内之數值控制程式、並控制 上述旋轉刀具沿著補正路徑以加工載物平台上之工件，且 數值彳工制裔在執行下一副程式之前，係先搜尋刀徑資料庫 、找出、田日守之磨後有效刀徑其係對應於旋轉刀具當時之 累進刀削長度，且下一副程式並使用當時之磨後有效刀徑 、代廣^r而將貫體外形路徑轉換成下一補正路徑，同時 1233383 數值控制器繼而控制旋轉刀具沿著下一補正路徑繼續加工 工件。 、 么由上述可知，於進行下—副程式（例如切削加工程式 之财，數值控制器可於刀徑資料庫内以當時之累進切" 5度對應找出-當時之磨後有效刀徑，並將此當時之磨後^ 效刀徑代入前述之下-副程式，並因此將實體外形路和轉 換成下-補正路徑而使旋轉刀具沿此下一補正路徑繼續加 工工件，如此可於進行每一次副程式之前即進行旋轉刀具 之補正，亦即藉由前述之刀具補償法則可隨時進行刀具補 10償量之設定，並可藉以提高加工完成後之產品精度。/、 【實施方式】 為能讓貴審查委員能更瞭解本發明之技術内容，特 舉一較佳具體實施例說明如下。 15 首先明參閱圖5係本發明較佳實施例之設備示意 圖，其中顯示有一數值控制機械，且此數值控制機械包ς 有一機台7,於機台7之一側並電連接有一控制面板6,於控 制面板6上則組設有一記憶體3、一刀徑資料庫4、以及一^ 值控制器5。此外，於機台7上並組設有一載物平台 20 Kplatfom)、以及一刀具庫71，且於刀具庫71上組裝有二 數支不同刀具711。 請同時參閱圖5、及圖6係本發明較佳實施例之工件示 意圖，於本實施例中，係使用刀具庫71中複數支不同刀具 711之其中一旋轉刀具2(rotating tool)對一工件8進行加 1233383 工，且前述之工件8係夾設固定於機台7之載物平台丨上，同 時旋轉刀具2於本實施例中係使用一銑刀，工件8則為一電 路母板，且此電路母板經加工切削後可成為複數個電路板 81，82,83."(PCB)。此外，旋轉刀具2係包括有一内部之中 5央軸線21、以及一外部之有效刀徑D，於加工時，旋轉刀 具2之中央轴線21係垂直正交於工件8之加工面肋，並沿其 中央軸線21持續旋轉。 °八 請同時參閱圖5、圖6、及圖7係本發明較佳實施例之 數值控制程式之示意圖，於圖7中顯示有一數值控制程式 10 P(NCpr〇gram)，其係儲存於上述控制面板6之記憶體3内， 此數值控制程式P即是用以加工切削載物平台丨上之工件 8，且於此數值控制程式p内包括有一副程式 Subroutine)，此副程式s係定義有一實體外形路徑 F^xact-profUe path) ’同時此副程式s可被用以呼叫並執行 15至少二次，其目的即是用以將前述工件8加工切削成為複數 個電路板81，82,83 ".(PCB)，亦即所謂之翻版。 於進行第一個電路板81之切削之前，由於此時旋轉刀 具2尚未進行切削，因此其有效刀徑D並未產生磨耗，此時 副程式S係使用此尚未產生磨耗之有效刀徑〇代入演算，而 20將實體外形路徑F轉換成一補正路徑c(c〇mpensati⑽ path)，而數值控制器5(NC c〇ntr〇ller)即執行數值控制程式 P、並控制旋轉刀具2沿著補正路徑c以加工工件8而進行第 一次之切削，並因此可切削得到第一個電路板81，而於進 行切削之同時，副程式S並同時計算旋轉刀具2之中央軸線 1233383 21相對於工件8的移行距離（moving distance)、並予以累加 (accumulate)而輸出一累進切削長度 d (accumulated cutting length) ’即旋轉刀具2切削工件8時之切削距離。 請同時參閱圖5、圖6、圖7、圖8係本發明較佳實施例 5 之刀具直徑與切削距離之曲線圖、及圖9係本發明較佳實施 例之刀徑資料庫之示意圖，上述控制面板6之刀徑資料庫 4(diameter database)其係儲存有複數筆刀徑記錄1233383 发明 Description of the invention: [Technical field to which the invention belongs] The present invention relates to a numerically controlled machine, especially a numerically controlled machine that can be used to compensate the offset wear of a tool, such as a computer numerical value 5 to control a molding machine and a computer numerical value. Control of drilling machines, etc. [Prior technology] In general Numerical Control (NC), such as a molding machine or a drilling machine, it uses a so-called tool to cut a workpiece 10, such as a circuit motherboard. Cutting is performed to obtain a plurality of circuit boards (PCBs). Please refer to FIG. 1 for a processing schematic diagram of a conventional circuit mother board, which shows a circuit mother board 91, and twelve circuit boards of the same size and size 15 (numbered, as described above) are to be cut on the circuit mother board 91. The processing method is traditionally called "reprint". Please also refer to Figure 丨 and Figure 2 for the schematic diagram of the numerical control program for the first processing. Because the general tool 92 itself has a diameter D: When cutting, you must add the value of the tool% diameter D (or radius) in the numerical control program, and use this value as the compensation amount during cutting ^ 2 so that twelve circuits of the same size can be obtained during cutting. Board (numbered 1 ~ 12), as shown in Figure 2, after "T1," the command sets the diameter D of the tool to 1.0. And the twelve circuit boards of the current circuit board 91 have been cut. After 1233383, the next circuit mother board 91 can be cut. Please refer to Figure 3 for a schematic diagram of the numerical control program of the second machining process. At this time, since the tool 92 is cut before the uranium, it will itself Abrasion occurs, so proceed Before cutting a circuit mother board 92, the user must change the numerical value of the diameter D of the tool 92 in the numerical control program according to personal experience. As shown in FIG. 3, the diameter D of the tool 92 is set to 0. 8 (This is because the diameter D of the tool 92 is reduced due to the wear of the cutter 92), and this value is used as the compensation amount to cut the twelve circuit boards of the next circuit mother board 92. Please refer to FIG. 1 again, however When the cutter 92 cuts the circuit board No. 1 of the previous circuit motherboard 10 92, the cutter 92 itself has abrasion. Similarly, after cutting each circuit board, the abrasion of the cutter 92 itself will gradually increase. With the above-mentioned conventional compensation method, the compensation setting of the tool 92 can only be changed after all 12 circuit boards have been cut. Therefore, for the 12 circuit boards that have been cut, it will have a 15 has the same size, and the size of the circuit board with the number 12 is larger than the size of the circuit board with the number U, and so on, so the accuracy of the product is greatly affected. In addition, please refer to Figure 4 for the conventional tool in the rotating state. produce Schematic diagram of the deflection, when the conventional tool 92 is used for processing, the tool 92 itself will generate a slight amount of deflection due to rotation, which will also cause an error of the cutting amount 20 and affect the product accuracy. [Content of the Invention] / 6 # The main purpose of the present invention is to provide a numerically controlled machine, which can only set the tool compensation amount at any time, and can improve the accuracy of the product after processing. 9 ~ In order to achieve the above purpose, this The numerical control machine of the invention mainly includes a load level σ, a rotary tool, a memory, a knife, and a numerical controller. M, a fixed rotary tool fixed on the load platform includes an internal central axis, And an external effective tool diameter, and the rotary tool rotates continuously along its central axis. / In addition, a numerical control program is stored in the memory. This numerical control program includes a program that is called and executed at least twice, and this 2㈣ $ meaning has-the physical shape path 'a this program and use the above two The effective tool diameter of the I tool is calculated on behalf of the person, and the aforementioned solid outline is specifically replaced with a —correction path. At the same time, the subroutine and calculates the travel distance of the center line of the rotary tool relative to the workpiece on the loading platform, and Accumulate and output a progressive cutting length. In addition, a plurality of tool radius records are stored in the tool radius hopper, which are respectively different from different turning tools, and each tool radius record includes a plurality of post-grinding = effects ^ which respectively correspond to different progressive cutting lengths. As for the numerical control system 2, it is able to execute the numerical control program in the above memory and control the rotary tool along the correction path to process the workpiece on the loading platform. Before the numerical control system executes the next program, First, search the tool diameter database to find out the effective tool diameter after grinding by Tian Rishou, which corresponds to the progressive cutting length of the rotary tool at that time, and the next program uses the effective tool diameter after grinding, Dai Guang ^ r to transform the whole body shape path into the next correction path, while the 1233383 numerical controller then controls the rotary tool to continue machining the workpiece along the next correction path. From the above, it can be known that in the following-subroutines (such as the wealth of cutting machining programs, the numerical controller can be found in the tool radius database with the progressive cutting at that time " 5 degrees correspondingly-the effective tool radius after grinding at the time , And then replace the ^ effective tool diameter at that time into the aforementioned under-subroutine, and therefore convert the solid shape path and down-correction path and make the rotary tool continue to process the workpiece along this next correction path, so that it can be used in Before each subroutine is performed, the rotary tool is corrected, that is, the tool compensation rule can be set at any time by the aforementioned tool compensation rule, and the accuracy of the product after processing can be improved. In order to allow your reviewing committee to better understand the technical content of the present invention, a preferred embodiment is described below. 15 First, referring to FIG. 5 is a schematic diagram of a device according to a preferred embodiment of the present invention, in which a numerical control mechanism is shown. In addition, the numerical control mechanical package includes a machine 7 and a control panel 6 is electrically connected to one side of the machine 7. A memory 3 and a tool diameter data are set on the control panel 6. 4, and a controller 5. In addition ^ value, and to set the machine 7 provided with a loading platform 20 Kplatfom), and a tool magazine 71 and the magazine 71 is assembled to the count for two different tools 711. Please refer to FIG. 5 and FIG. 6 at the same time, which are schematic diagrams of the workpiece of the preferred embodiment of the present invention. In this embodiment, a rotating tool 2 (rotating tool 2) of a plurality of different tools 711 in the tool magazine 71 is used to align a workpiece. 8 and 1233383 are added, and the aforementioned workpiece 8 is clamped and fixed on the loading platform 丨 of the machine 7 while rotating the cutter 2 in this embodiment uses a milling cutter, and the workpiece 8 is a circuit mother board. And this circuit mother board can be processed into a plurality of circuit boards 81, 82, 83. (PCB) after cutting. In addition, the rotary tool 2 includes an inner 5 central axis 21 and an external effective tool diameter D. During processing, the central axis 21 of the rotary tool 2 is perpendicular to the machining surface rib of the workpiece 8, and It continues to rotate along its central axis 21. ° Please refer to FIG. 5, FIG. 6, and FIG. 7 for a schematic diagram of a numerical control program of a preferred embodiment of the present invention. A numerical control program 10 P (NCprgram) is shown in FIG. 7 and is stored in the above. In the memory 3 of the control panel 6, this numerical control program P is used to process the workpiece 8 on the cutting load platform, and a subroutine is included in the numerical control program p. This subroutine s is defined There is a solid outline path F ^ xact-profUe path) 'At the same time, this subroutine s can be used to call and execute 15 at least twice, the purpose of which is to process and cut the aforementioned workpiece 8 into a plurality of circuit boards 81, 82, 83 ". (PCB), also known as a reprint. Before the cutting of the first circuit board 81, since the rotating tool 2 has not been cut at this time, its effective tool diameter D has not been abraded. At this time, the subroutine S is to use this effective tool diameter 0 which has not yet generated wear. Calculation, and 20 converts the solid outline path F into a correction path c (c〇mpensati⑽ path), and the numerical controller 5 (NC c〇ntr〇ller) executes the numerical control program P and controls the rotary tool 2 along the correction path c The first cutting is performed by processing the workpiece 8, and therefore the first circuit board 81 can be cut. At the same time as the cutting, the subroutine S simultaneously calculates the central axis 1233383 of the rotary tool 2 relative to the workpiece 8 Moving distance and accumulate to output an accumulated cutting length d (accumulated cutting length) 'that is, the cutting distance when the rotary tool 2 cuts the workpiece 8. Please refer to FIG. 5, FIG. 6, FIG. 7, and FIG. 8 at the same time as the tool diameter and cutting distance curve of the preferred embodiment 5 of the present invention, and FIG. 9 is a schematic diagram of the tool radius database of the preferred embodiment of the present invention. The diameter database 4 (diameter database) of the above control panel 6 stores a plurality of diameter records
Rl，R2，R3".(diameter records)，每一筆刀徑記錄ri，r2，R3 係分別對應於刀具庫71内之不同刀具711，即上述銑刀之旋 10轉刀具2亦有其所對應之刀徑記錄R2。此外，每一筆刀徑 吕己錄R1，R2，R3…並包括有複數個磨後有效刀徑 Dll，D12，D13，...（worn diameter)，此等磨後有效刀徑 D11，D12，D13，._.係分別對應於不同之累進切削長度 dl，d2，d3···，而前述之磨後有效刀徑以丨卫^卫^…係全經 15貝物貝焉致後加以測量紀錄，如圖8所示之曲線圖、以及圖9 所示之資料庫之示意圖，故已同時考量銑刀之徑向磨耗 值、以及高速偏擺時所產生之誤差值二者。 此處需注意的是，當第一個電路板81切削完成而欲進 行下一電路板82之切削之前，亦即數值控制器5在執行下一 20副程式S(next subroutine)之前（如圖7中數值控制程式p内 之’’M02”指令），此時旋轉刀具2會先向上拉起，即所謂之 拉刀’於此同時’數值控制器5會依照先前旋轉刀具2執行 上一次切削時所輸出之當時之累進切削長度d，對應至刀徑 資料庫4内以找出一當時之磨後有效刀徑D(current w〇rn 1233383 diameter)，且副程式S並依此當時之磨後有效刀徑D代入演 异’而將下一電路板82之實體外形路徑F轉換成下一補正 路徑C(next compensati〇n path)，而數值控制器5則繼而控 制旋轉刀具2沿著此下一補正路徑C繼續加工工件8，並因 5此切削得出下一電路板82。 上述數值控制器5依照先前旋轉刀具2執行上一次切 削時所輸出之當時之累進切削長度d、並對應至刀徑資料庫 4内以找出一當時之磨後有效刀徑D之方式，係乃數值控制 器5其先搜尋刀徑資料庫4以找出二個鄰近之磨後有效刀徑 10 D11，D12,此二個鄰近之磨後有效刀徑DU，D12係對應且最 鄰近於旋轉刀具2當時之累進切削長度d，之後，數值控制 器5再以此二個鄰近磨後有效刀徑DU，D12進行插值運 t，並因此找出當時之磨後有效刀徑D，而插值運算以内 插法或是外插法皆可。 15 如上所述，依照上述步驟即可切削出十二個電路板 81，82,83_··，其中於進行每一次副程式s之切削之前，亦即 於進行每一次之下一電路板82,83,84…之切削之前，於旋轉 刀具2向上進行拉刀動作時，數值控制器5即會依照當時之 累進切削長度d並對應至刀徑資料庫4内，以插值運算方式 20找出當時之磨後有效刀徑D，並且以此所找出之磨後有效 刀控D代入演算而將下一電路板叹队料··之實體外形路 徑F轉換成下一補正路徑c，i再以此補正路徑c繼續加工 工件8 〇 11 1233383 囚此 於退仃母 二又之下 冤路板82,83,84之士^ ，前，即可進行旋轉刀具2之補正，亦即藉由上述之刀= •法則可隨時進行刀具補償量之設^，如此所 :補 個電路板81，82,83·..可維持於—定之精度，亦即可提古Λ 完成後之產品精度。 私冈加 工 於上述實施例中，旋轉刀具2係使用銳刀，但使 頭或其他刀具亦可達成同樣功能。此外，上述實施例之銳 刀其中央軸線2!係垂直正交於工件8之加工面8〇，但可視兩Rl, R2, R3 ". (Diameter records), each tool diameter record ri, r2, R3 respectively corresponds to a different tool 711 in the tool magazine 71, that is, the 10-rotation tool 2 of the milling cutter also has a corresponding Tool radius record R2. In addition, each of the tool diameters Lu Jilu R1, R2, R3 ... and includes a plurality of effective tool diameters Dll, D12, D13, ... (worn diameter), these effective tool diameters D11, D12 after grinding, D13, ._. Are corresponding to different progressive cutting lengths dl, d2, d3, etc., and the effective tool diameter after grinding is measured by Wei ^ Wei ^ ... after all 15 shells have been measured The record is shown in the graph shown in Figure 8 and the schematic diagram of the database shown in Figure 9. Therefore, both the radial wear value of the milling cutter and the error value caused by high-speed yaw have been considered at the same time. It should be noted here that when the first circuit board 81 is cut and the next circuit board 82 is to be cut, that is, before the numerical controller 5 executes the next 20 subroutines S (as shown in the figure) "M02" instruction in the numerical control program p in 7), at this time, the rotary tool 2 will be pulled up first, that is, the so-called broach 'at the same time', the numerical controller 5 will perform the previous cutting according to the previous rotary tool 2 The current progressive cutting length d output at that time corresponds to the tool diameter database 4 to find a current effective tool diameter D (current w〇rn 1233383 diameter), and the subroutine S is based on the current grinding. The later effective tool diameter D is substituted into the difference, and the physical shape path F of the next circuit board 82 is converted into the next compensating path C, and the numerical controller 5 then controls the rotary tool 2 along this path. The next correction path C continues to process the workpiece 8, and the next circuit board 82 is cut based on this cutting. The numerical controller 5 is based on the progressive cutting length d at the time that was output when the previous cutting tool 2 performed the previous cutting and corresponds to Within the tool radius database 4 The method of effective tool diameter D after grinding at that time is the numerical controller 5 which first searches the tool diameter database 4 to find two effective tool diameters 10 D11 and D12 after grinding, which are two adjacent tools. The rear effective tool diameter DU, D12 corresponds to and is closest to the progressive cutting length d of the rotating tool 2 at that time. After that, the numerical controller 5 uses the two adjacent grind effective tool diameters DU and D12 to perform interpolation t, and therefore Find out the effective tool diameter D at that time, and interpolation or interpolation can be used for interpolation. 15 As mentioned above, you can cut out twelve circuit boards 81, 82, 83, etc. according to the above steps. Among them, before performing each cutting of the subroutine s, that is, before performing each cutting of the next circuit board 82,83,84, etc., when the rotary cutter 2 performs a broaching action upward, the numerical controller 5 will According to the progressive cutting length d at that time and corresponding to the tool radius database 4, an interpolation calculation method 20 is used to find the current effective tool diameter D after grinding, and the found effective tool control D is substituted into the calculation based on the found The next circuit board sighs the physical shape path F to the next Positive path c, i then continue to process the workpiece with this correction path c 〇11 1233383 Prisoner 82,83,84 who is inferior to the second and second ^, before you can correct the rotary tool 2 That is, by the above-mentioned knife = • rule can set the tool compensation amount at any time ^, so: a circuit board 81, 82, 83 .. can be maintained at-a fixed accuracy, which can also be completed The precision of the latter product. In the above-mentioned embodiment, the rotary cutter 2 uses a sharp blade, but the head or other tools can also achieve the same function. In addition, the sharp blade of the above embodiment has a central axis 2! Handed over to the machining surface 8 of the workpiece 8, but two
要於其他數值控制機械中使刀具之中央轴線平行於工件之 10 加工面亦可。 上述實施例僅係為了方便說明而舉例而已，本發明所 主張之權利範圍自應以巾請專利範圍所述為準，而非僅限 於上述實施例。 15【圖式簡單說明】 圖1係習知電路母板之加工示意圖。 圖2係習知第一次加工之數值控制程式之示意圖。 圖3係習知第二次加工之數值控制程式之示意圖。 圖4係習知刀具於旋轉狀態下所產生之偏擺示意圖。 20圖5係本發明較佳實施例之設備示意圖。 圖6係本發明較佳實施例之工件示意圖。 圖7係本發明較佳實施例之數值控制程式之示意圖。 圖8係本發明較佳實施例之刀具直徑與切削距離之曲線圖。 圖9係本發明較佳實施例之刀徑資料庫之示意圖。 12 1233383 【圖號說明】 1 載物平台 2 旋轉刀具 21 中央軸線 3 記憶體 4 刀徑資料庫 5 數值控制器 6 控制面板 7 機台 71 刀具庫 711 刀具 8 工件 80 力口工面 81，82,83電路板 91 電路母板 92 刀具In other numerically controlled machines, the center axis of the tool should be parallel to the 10 working surface of the workpiece. The above embodiments are merely examples for the convenience of description. The scope of the rights claimed in the present invention should be based on the scope of the patent application, and not limited to the above embodiments. 15 [Brief Description of the Drawings] Figure 1 is a processing schematic diagram of a conventional circuit mother board. Figure 2 is a schematic diagram of a conventional numerical control program for the first processing. Figure 3 is a schematic diagram of a conventional numerical control program for the second processing. FIG. 4 is a schematic diagram of the deflection generated by a conventional cutter in a rotating state. 20 FIG. 5 is a schematic diagram of a device according to a preferred embodiment of the present invention. FIG. 6 is a schematic diagram of a workpiece according to a preferred embodiment of the present invention. FIG. 7 is a schematic diagram of a numerical control program according to a preferred embodiment of the present invention. FIG. 8 is a graph showing a cutter diameter and a cutting distance according to a preferred embodiment of the present invention. FIG. 9 is a schematic diagram of a tool radius database according to a preferred embodiment of the present invention. 12 1233383 [Illustration of drawing number] 1 Loading platform 2 Rotary tool 21 Central axis 3 Memory 4 Tool radius database 5 Numerical controller 6 Control panel 7 Machine 71 Tool magazine 711 Tool 8 Workpiece 80 Faces 81, 82, 83 circuit board 91 circuit motherboard 92 cutter
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