Smithy CNC Mills Bedienungsanleitung PDF herunterladen (Seite 116)

SmithyCNC Programmer’s Reference Manual: Mill Canned Cycles

10-13

For our example block both I and J are negative so they move back from the

hole axis along the path just made by the tool. The amount of offset required

should be just enough that the tool tip will slide down through

the bore.

Next the canned cycle moves the tool down in z and at the bottom location rep-

resented in the block by the Z 0.4 value it moves the tool back to the center of

the bore.

Now the g87 canned cycle turns the spindle on and moves back up into the

bore at the programmed feedrate. This is the real cutting action of this canned

cycle. With the proper tool in a boring bar this cycle will produce a chamfer on

the bottom side of the bore. G87 can also be used to produce a larger diameter

bore on the bottom side of the bore.

When the tool has reached the K position

it is returned to the bottom location, the

spindle is stopped and oriented and fol-

lows the earlier path back out of thebore

to the ini

tial position above.

This canned cycle assumes spindle orien-

tation which has not been implemented in

the EMC to date. The proper alignment of

the tool tip to the oriented spindle is criti-

cal to the successf

ul insertion of the tool

through the hole to be backbored.

10.10 G88 Cycle

The G88 cy

cle is intended f

or boring. This cy

cle uses a P value, where P speci-

fies the number of seconds to dwell.

0. Preliminary motion, as described above.

1. Mo

e the Z

-axis only at the current feed rate to the Z position.

2. Dwel

l f

or the giv

en number of seconds.

3. Stop the spindle turning.

. Stop the program so the operator can retract the spindle manually.

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