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(Instructions menu) dialog enables you to group such instructions into a
single cycle so that multiple, identical holes may be drilled with one G81
canned cycle. Please note that this option is only available when
rationalise is by tool. Also see Merging Hole Cycles.
Ensure that you have carefully checked the re-ordered sequence before
deleting the old one and using the new one.
64
EdgeCAM Manufacture - User Guide
Rationalising by Tool
Instructions will be selected by turret position ONLY. If different tools have
been assigned to the same position the one assigned first will be used. A
warning will be given if a different tool type, diameter(s), corner radius, angle
or description is encountered on a previously used turret position.
The sorting mechanism will work through the sequence sorting by tool as the
first instance of use is found. If a tool is required to be exempted from sorting
you will have to edit it to another turret position number and then reset it after
the sorting is complete.
A check will be made to ensure that a turret position has been specified for all
tools. If not, a warning will be given and the faulty toolchange indicated in the
browser.
Changes to Tlo offset register for a given tool position will be maintained. If
this situation is encountered a toolchange command will be used to change
the value. No other tool parameters will be changed and there will be a retract
to safe height before the toolchange instead of a return to toolchange position.
All instructions using the tool will be moved with it. Any necessary index or
datum shift instructions to give correct orientation from the preceding
instructions will be inserted.
Where groups of instructions are brought together by the rationalisation
process a move to safe Z will always be inserted. This will prevent the creation
of 3D rapid moves that could scrap the part or be a safety hazard. If required,
you can remove such moves afterwards.
Rationalise will insert retract moves to the Z of the toolchange position before
inserted index and datum shift instructions. Index commands will be inserted
with the shortest direction modifier set.
There are circumstances when sorting by tool in order of first use does not
give you the desired results. In this case, an alternative method of sorting by
tool can be used. See Rationalising by Priority.
When sequences are rationalised, a number of cycles are frequently
grouped together for machining by a single tool. In the case of hole cycles this
gives rise to a canned cycle (G81 etc) in the NC file for each EdgeCAM cycle
instruction. The Merge Hole Cycle option on the Rationalise Sequence
(Instructions menu) dialog enables you to group such instructions into a
single cycle so that multiple, identical holes may be drilled with one G81
canned cycle. Please note that this option is only available when rationalise is
by tool.
65
Editing Instructions
Rationalising by Priority
There are circumstances when sorting by tool in order of first use does not give
you the desired results. For some combinations of cycles this can, for example,
reverse the order of roughing and finishing, with dangerous results. To
overcome this scenario, you can assign a sort priority to each toolchange by
specifying a Sort Priority modifier on the More tab of the toolchange dialog.
Sorting will then be performed by order of first use within each priority group.
All tools with the same priority will be sorted by order of first use, followed by
those with the next priority and so on in ascending numerical order.
If a Sort Priority has been assigned to a toolchange this priority will be
displayed in the Instructions Browser to the right of the instruction number.
Usage Tips:
It is much easier to set the priority of tools in the individual part files when
developing the machining sequence before rationalising the merged
sequence. We would suggest that types of tools are given a pre-defined
number that relates to a type of operation.
For example:
100 = Roughing
200 = Semi roughing
300 = Semi finishing
400 = Finishing
500 = Centre Drill / Spot face
600 = Drilling
700 = Tapping / Reaming / Boring
When the merged sequence is rationalised the priority order will ensure that
all roughing is carried out before any semi-roughing and semi-roughing is
performed before any semi-finishing etc.
Any final changes to the tooling order can be achieved by adjusting the Sort
Priority after rationalisation.
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