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Thread: Carbide insert experience
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25th Aug 2018, 05:16 PM #16Diamond Member
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I’m a big fan of holders that make use of the 100 degree corners for turning facing and boring. Because they are ‘free’ corners they seem to last forever no matter how much I abuse them.
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25th Aug 2018, 05:27 PM #17
I'm finding I have a lot of good luck with tools and inserts form "Banggood". They have a very large variety and shapes and sizes at very good prices. At those prices, you don't have much to complain about when something breaks.
I noticed in several photos above that people are using significant stick-out of the tools from the tool holders. On a small lathe with inferiour tools, and carbide tips that is a real NO-NO. Hare the cutting tip as close to the toolpost as absolutely possible. Even if you have to move it out a little for subsequent cuts. Even the flexing of the tool is sufficient to produce chatter and destroy the carbide tips!
The other things with carbide tips is: try to run fast enough to just colour the chips. When they come off uncoloured, the tip is not working efficiently and you don't get the best finish you can get. Think "hoe" (carbide) vs. "axe" (HSS) - microscopically speakingCheers, Joe
retired - less energy, more time to contemplate projects and more shed time....
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25th Aug 2018, 08:51 PM #18
Hi Joe, hope you are keeping well.
I'm very much in favour of HSS lathe tools, only having a low powered lathe ! But I have found that carbide tooling is getting better as time goes by. I think that the manufacturing process is getting better at producing sharper edges comparable with well ground HSS tools. More compatible with hobby machine tools.
About the only time I use carbide is when machining SS and cast iron, and the odd threading insert, particularly internal threads.Best Regards:
Baron J.
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25th Aug 2018, 09:00 PM #19.
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Chris,
I slipped up to the shed with phone in hand. This is a pretend Korloy cutting 316 at 1000rpm with a DOC of 0.015" and the slowest feed on the 9's gearbox.
IMG_20180825_145153020 (1) (Large).jpg IMG_20180825_145359559 (Large).jpg
BT
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25th Aug 2018, 09:49 PM #20Golden Member
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25th Aug 2018, 10:39 PM #21.
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Bill,
That toolholder started off life as a much longer 12mm diameter boring bar. The great thing about cheap Chinese tooling is that it's easy to take to it with a hacksaw.
Here are a few examples of butchered boring bars, modified to fit my boring head and to be used as end mills.
IMG_20180825_152649446 (Large).jpg IMG_20180825_152745849 (Large).jpg
And for Bill and Anyone else who may be interested in another useful and possibly more dexterous insert type using the same grade of "Korloy" high positive rake insert, a selection of DC.. 07.. holders. I would use these as much as the 09 inserts. ( I have yet to use the rear facing boring tool, its day with come.)
IMG_20180825_152001125 (Large).jpg IMG_20180825_152046408 (Large).jpg
BT
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25th Aug 2018, 11:29 PM #22China
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Here are the pics of the set I have, holders are 9.8 mm
P1010285.jpgP1010281.jpgP1010283.jpgP1010282.jpgP1010280.jpgP1010284.jpg
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26th Aug 2018, 12:06 AM #23.
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China,
Your SDNCN holder is the same as the one I have pictured in the Boeni toolholder. Yours looks like the front top corner has been whacked. If it has indeed been damaged it probably won't provide sufficient support for the already pretty delicate insert. If you wanted to replace that holder, US eBay is usually a better source than eBay Au. - https://www.ebay.com/itm/SDNCN1010H0...UAAOSwfZtbFLVn These are similar to the inserts I use - https://www.ebay.com/itm/10pcs-Korlo...cAAOSwlnZZrM1q
Bob.
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26th Aug 2018, 01:58 AM #24China
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Yes you are correct, it was damaged when the insert snapped, i will look at getting a new one, and take things a bit slower and easily until I am more familiar with this carbide stuffMetal lathe work is a learning experience for me, I have had the the lathe for 25 odd years and this is the first time I have tried carbide, it would be nice if I could just pick up a chisel and attack it like my woodturng
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26th Aug 2018, 08:58 AM #25Most Valued Member
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26th Aug 2018, 10:35 AM #26.
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I must be getting away with it because the Bulgarian made Kennametal tools in those photos mustn't be that inferior and I must just be lucky with the Chinese holders I use. I have them projecting as they do to prevent the toolpost from smacking into the tailstock. The photo below shows a Bulgarian holder supporting a Kennametal KC5025 insert cutting a piece of 4140 at 1800 rpm. The holder is dangling out as much as it is in my other photos. I thought the finish was OK though to others it probably looks as rough as guts. Different ideas of good and bad I guess.
High Speed Pulleys 009 (Medium).jpg
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6th Sep 2018, 07:38 PM #27Golden Member
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Hey,
My pretend Korloy bits arrived today. Amazing .... Stunning .... Awesome.
My Hercus has a top speed of 720 - I got terrific finishes on the following running at my top speed of 720rpm.
Approx 1.25" Aluminium
3/4" stainless steel
1" Brass
Daggy black bar - reduced from 20mm to 11.5 mm (go/nogo testing pin for a holesize)- managed a 2mm cut and left a decent finish - tried a 4mm cut on another piece and started chattering.
I had never acheived finishes this good from carbide before and was starting to believe the - "small lathes can't do carbide " ........ anyway my little Hercus running at 720 rpm was happily cutting daggy black bar right down to 11.5mm ..... thats way underspeed according to what I previously believed.
Just for fun I tried to put a 60 degree point on a piece of 3/4" stainless steel, was struggling a bit and looking a bit ratty towards the pointy end. Playing with making pointy bits might help understand valid speed ranges/diameters in different materials
Was wondering .........not sure why anyone would want to do this it gives great finishes as it is ...... tip the bit up on its side to turn it into a shear tool - seems sharp enough ?
Many thanks for all tips and discussion in this thread.
Bill
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6th Sep 2018, 10:24 PM #28China
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That's good to hear, still waiting for mine to arrive as per suggestions above.
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15th Sep 2018, 08:18 PM #29.
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It is often a lucky dip buying tooling online and probably more so when it's Chinese eBay as these two purchases will attest.
I had been hunting for a couple of holders that would allow the use of the shallow angled corners on the CCGT 09 and 06 inserts I have in an unhanded fashion. Both holders supposedly share the same geometry given their identification codes. They don't so the search continues.....
The small tool holder is pretty good value. The Kennametal holder cost about ninety dollars.
https://www.ebay.com/itm/10-100mm-Ne...gAAOSwGzxZibWO
IMG_20180915_154237356 (1) (Large).jpg IMG_20180915_154312977 (Large).jpg
BT
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16th Sep 2018, 10:27 PM #30
With a small Sheraton 9 lathe, I've had good results with small radius TNMG inserts in a MTJN style holder. Had to reduce the 16 mm tool height down in order to fit it in the AXA holder.
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