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<div class="moz-cite-prefix">Randy333 wrote:<br>
</div>
<blockquote cite="mid:***@4ax.com"
type="cite">
<pre wrap="">Guys,
I need to cut an oil groove in a bushing, 50mm long 49.7mm ID. Two
crossing grooves. Any way to do this on a CNC lathe? Older Siemens
control. 840C. I think I would need to use a threading cycle since
that is the only cycle that syncs the chuck to the tool.
Any thoughts?
Remove 333 to reply.
Randy
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</pre>
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<br>
<br>
<font size="+1">Randy, I think I got this on Practical Machinist,
I've never used it so I have no idea how well it works.<br>
<br>
Have done this lots of times...<br>
I use G33 to make a helical groove....run the tool into the bore
then plunge to depth while feeding forward at the required lead.<br>
at the end of the bushing i reverse the feed direction without
retracting the tool then at the start of the bushing i retract....<br>
Gives a figure "8" type of groove if you do the lead and distance
correctly.<br>
Must use a tool with relief at both sides because of having the
tool cut in both the forward and reverse direction....<br>
A 35* diamond profiling tool will work if you don't push it....<br>
<br>
I will usually run several passes at finished depth using some
plus and minus on the length wear offsets to widen the groove a
bit.<br>
You must add depth for each pass to make this work with multi cuts
to depth<br>
<br>
You can write a little macro to change the depth move for each
pass too get to full depth.<br>
<br>
basic program looks like this:<br>
<br>
O0009 (oil groove)<br>
T1515<br>
M3S40<br>
G0 Z.5 X1.040<br>
GO Z-.195 X1.040<br>
G33 X1.080 Z-.230 F.740<br>
G33 Z-.940 F.740<br>
G33 Z-.230 F.740<br>
G33 X1.040 Z-.195 F.740<br>
G0 X1.040 Z4.0<br>
MO5 M30<br>
<br>
<br>
<br>
Best,<br>
Steve<br>
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