(A) delimits calculation requires before the circle (B) needs to have piece of a place of strategic importance (C) occurrence ellipse (also be elliptical after D) and axis are vertical 1 muti_function delimit of compasses put forward to delimit compasses be delimit on the spare parts the main tool of circular arc. The two pointed feet when underlining must be on the same plane of the spare parts; If two pointed feet cannot be on same plane, the distance between pointed foot is not what to delimit round radius. If the limitation as a result of spare parts appearance, delimit compasses two pointed feet cannot be when same plane, want lay off radius to be the circle of R at this moment, delimit compasses the distance of two pointed feet should be adjusted see attached drawing A) for R(. R=(r2+h2)½ , h is the vertical distance of surface of two a flight of stairs. Become when H is bigger, because delimit compasses centering pointed foot cannot support to develop eye center in appearance, so the circle of lay off has an error. Place of attached drawing B shows a part, so that the for lay off aperture center when underlining delimits at using the program is round, the center should be assembled inside the chamfer of the spare parts piece of a place of strategic importance. The cylinder face that shows a part in place of attached drawing C delimits round, its are round (see vertical view) for ellipse. With delimit compasses in the spare parts inside, outside circular arc apparently the ellipse that delimits its circle all keeps the circle in different program. Place of attached drawing D is shown, delimit on the inclined plane of the spare parts round. This circle is in vertical view, still be elliptical. Underline in surface of above spare parts in, some need are calculated first, install piece of a place of strategic importance, some round occurrence ellipse make a kind for this design muti_function delimit compasses. Delimit selective hardening handles compasses pointed foot. 2 use methods are in move line segment of feet, cent, delimit before the circle, will delimit the foot of pivot of the centre of a circle of compasses and underline pointed foot to be opposite on same plane neat. Pigheaded copper bolt secures shaft of the centre of a circle very closely, move again line segment of feet, cent. In attached drawing A, Bo Ling on delimit when the circle, press radius R feet, to delimiting compasses distance of two pointed feet. Screw off cupreous bolt, again the pointed foot of will round arbor and the fluctuation height that underline pointed foot, by H the vertical distance of surface of two a flight of stairs is opposite dimension, after pigheaded copper bolt secures shaft of the centre of a circle, delimit round. Delimit on spare parts of attached drawing C, D when the circle, be opposite by radius R dimension delimit compasses after two pointed feet are apart from, screw off cupreous bolt, delimit the turn part of compasses as underline pointed foot to turn on the circular arc face of the spare parts or cant, also go up in axis of the centre of a circle as face of shape of spare parts geometry at the same time, axial moves up and down. Delimit in round process, range estimation, axis of the centre of a circle wants the axes with the centre of a circle perpendicular, axis of control the centre of a circle not be patient of swings phenomenon. Should delimit compasses classics uses a proof, except have common delimit outside the function of compasses, do not suffer attached drawing place to show the limitation of appearance of spare parts geometry, assure to delimit round circularity. Show new-style delimit the distinctive function of compasses. CNC MillingCNC Machining