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20th January 2014, 02:58 PM #16Chief Swarf Maker
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Yeah the guy has designed up super fancy billet uprights/hubs but that is a BIG machining job, needs more travel, axis' and skill than i have at the present time.
Anyway, back on topic -have you tried a decent cut yet Ray?
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20th January 2014 02:58 PM # ADSGoogle Adsense Advertisement
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20th January 2014, 07:07 PM #17
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20th January 2014, 07:34 PM #18SENIOR MEMBER
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*Now* you're talking! Time for a bigger motor. If the chips aren't red hot (instantly turning blue) off the tool, and shooting at least 1m away to burn hell out of the operator and anyone nearby - it's time to up the speed & feed.
.... and stop machining in T shirts & joggers, because the chips melt through the uppers and it's hard to get them off fast enough. Guess how I know that.....
PDW
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20th January 2014, 07:52 PM #19Senior Member
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Bit to read about Kyocera cermet inserts here:
Cermets Get Assertive : Modern Machine Shop
Generally though with the 0.4 nose radius of the inserts you have, would make them a good finishing and light cutting insert only.
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20th January 2014, 09:46 PM #20
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22nd January 2014, 11:11 PM #21Chief Swarf Maker
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Pretty much what he said....
If you are cutting properly the chips will melt into your skin in a few seconds.
Generally my chips are white right at the cut zone then turn blue after 1mm or so.
WRT stalling the motor, you are on the right track. For heavy cuts i just juggle the feedrate until you can hear the motor load right up. Basically feed it as fast as you can til the motor slows. I have my vfd setup to drop the frequency (speed) when the current limit is reached, rather than shut down so i can keep working and just back off the feed a bit until it recovers.
Keep at it, they take some getting used to but are well worth it once you work them out.
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5th February 2014, 08:15 PM #22Senior Member
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Nah that aint a knife!
Using the lathe today and remembered this post so thought i'd drag it up for a little more comment. CCMT inserts, 8.5" x 16" lathe, 10mm tooling, cold rolled bar, 5.25mm cut!!! Can't take much bigger a cut with these inserts, the edges are only 6mm. I have loaded the whole edge up before though. These inserts slice through stainless well to, beautiful bright blue ribbons. With CCMT inserts the SCBCR/SCKCR holders come in handy, lets you use all four corners, that's SCBCR in the pic. I took some video for the untrusting, lol. Don't know how to post it though if someone could help?
This is a heavy cut on a tiny 95kg lathe...
20140205_185502.jpg
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5th February 2014, 08:28 PM #23
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5th February 2014, 09:56 PM #24.
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Hi Ray,
What CCGT high rake inserts are you using? I wouldn't mind finding something less expensive than the Kennametal KC5010 grade inserts I'm using. The Cermets have a strong appeal but the eBay offerings I have seen have not been high positive/rake. Flat stuff doesn't work on my bitty lathe.
BT
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5th February 2014, 10:20 PM #25
Hi BT,
IMG_0671s.JPG
The two on the left are the high rake , the one on the right is cermet.
Josh has been making shafts for the sliding side gate bearings, so I've carefully posed a couple at the top of the picture.. Nice sliding fit on the bearings and hex heads done on the mill with rotary table.
Ray
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5th February 2014, 11:03 PM #26Senior Member
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5th February 2014, 11:17 PM #27Senior Member
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Okay here's the vid. I'm not laying into this cut, only one hand on the lathe the other leaning over it trying to film, with two hands on the wheel i'd push it harder. Still gets a bit of color as the cut heats up. With the compound removed and a solid toolblock bolted to the crosslide i reckon this lathe would take a 6.5 - 7mm cut in carbide.
https://vimeo.com/85914218
Hopefully that worked.
Brett.
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5th February 2014, 11:46 PM #28
Hi Brett,
That video came out well, handled the cut, no drama... Although, I would have expected a bit more colour in the chips...
Ray
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6th February 2014, 12:03 AM #29Senior Member
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6th February 2014, 01:30 PM #30
Another Cermet CCMT video... noisy bugger...
Ray
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