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Andrew Johnston10/05/2016 11:46:44
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Posted by Neil Wyatt on 10/05/2016 09:59:45

I think matching speed and feed (and making sure they aren't too low) is more important than rigidity. Worst thing is too slow = rubbing = horrible noise and as your instinct (and received wisdom for HSS) is to slow down it takes practice to gain confidence to just up the speed and plough the insert into the work.

Finally an outbreak of understanding about the cutting process! Chatter is an oscillatory effect that can often be cured by increasing feedrate, irrespective of tool material. On any lathe the tool is going to move as the cut starts. For a low feedrate if said feedrate decreases by a large percentage as the tool moves then it is quite likely that chatter will result. However, for a higher feedrate the tool is more likely to stay where it is once the cut has started, so no chatter. The important thing is that the cutting process is stable, not how much the tool moves or how rigid the setup is in absolute terms.

Andrew

Muzzer10/05/2016 19:26:01
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Posted by Andrew Johnston on 10/05/2016 09:53:49:
Posted by Muzzer on 09/05/2016 20:09:13:

Bottom of page 10 of the May Cutwel flyer has MGT tool and 30 inserts for £99 if you are wavering....

Damn it; had to go and dig the flyer out of the recycling bin! Fortunately (?) it's not quite what I'm looking for. What I actually want is a copying insert, ie, rounded tip, that I can use with my hydraulic copying unit.

Andrew

Yes, sometimes they allow mix and match on inserts but for this offer it's just the straight parting / turning insert. I mean to get some copy (round) inserts for KGT holder some day for profiling / copying.

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