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| Parting with cardide tools |
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| loply:
Hi folks, I bought a Glanze indexable carbide parting tool, the kind with a "blade" and a weird shaped insert that locks in place by use of The Force. Tried it the other day - made sure the tool was totally square to the workpiece, 20mm mild steel, tightened everything up and locked the sadle, and fed it in at 150rpm using a constant flow of engine oil to keep things cool. It cut like butter with no noise or chatter and just silently peeled the metal off. Got about 2/3rds through when all of a sudden the insert snapped in half and chipped the pocket that it sits in... :doh: Just wondering what I did wrong? I have ordered a new insert, luckily the "blade" of the tool is double ended so I can use the other pocket. If this happens again I will need a new blade and a new insert... this could be expensive if it happens frequently! Cheers for any tips. Rich |
| Nemt:
Your number of revs is not interesting. Your cuttingspeed is important. When using carbide tooling, in general your cuttingspeed has to be high enough to achieve good cutting results. When parting of, cuttingspeed decreases when getting closer to the centerline of the workpiece. The lower the cutting speed the higher the forces on the tool! That is why your tool is breaking comming closer to the end! Nemt |
| Bernd:
You didn't mention if you had set the tool right on center. Bernd |
| loply:
Tool was centered first and judging by the way it was cutting it was not a problem, neutral feeling to the handle (not sucking in or pushing out) and seemed to cut well. How much force should I be putting on the cross slide handle? I tried to "keep the chip coming" and just kept it at a rate which made no noise and kept a continuous chip peeling off. Is this too fast? Not fast enough? I could probably have cranked it harder but I feel it would have caused chatter. |
| DaveH:
To maximise the rigidity especially on small lathes you need to part off as close to the chuck as possible. Just my 2p's worth. DaveH |
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