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Thread: Carbide insert experience
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16th Sep 2018, 10:38 PM #31Senior Member
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Sorry to be the bearer on bad news but those tools holders are exactly what they are meant to be.. or at least they are what the code on the side says they are
The -100 on the end is the designation that means it uses the shallow corner
My best suggestion for anyone new to insert tooling is get your hands on a catalog and see exactly what is available
I'm guessing this is the tool holder your looking for ?
https://www.aliexpress.com/item/SCMC...291289143.html
vs what you bought
https://www.aliexpress.com/store/pro...291779324.html
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16th Sep 2018, 11:43 PM #32.
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MS,
I had paid for the SCMCN1212H09-100, the seller sent the incorrect holder. Thanks for the enlightenment re the 100 suffix.
Capture 1.JPG
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5th Oct 2018, 11:40 PM #33.
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This time the correct toolholder, purchased inexpensively from another eBay seller, arrived in today's mail. The 12 x 12 holder isn't wide enough to conceal the 80 degree corners but given that the holder was intended for use with those corners snapped off I suppose it matters little.
https://www.ebay.com.au/itm/SCMCN121...53.m2749.l2648
IMG_20181005_160543793 (Large).jpg IMG_20181005_160553509 (Large).jpg
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6th Oct 2018, 07:26 AM #34Most Valued Member
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Bob,
I have the holder, bought on your recommendation, that holds the insert at a slight angle. I've only just loaded it with an insert after knocking the two 80 degree corners off. I'm looking forward to trying it out.Chris
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6th Oct 2018, 10:03 AM #35.
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Another plug for the cheap pretend, Joe recommended, CCGT Korloys, intended for aluminium. I had to reduce the diameter of this 316 bar from 1 1/4" to 3/4". Took a while, 900 rpm, .015" DOC with a feed of .003" per rev. The swarf produced was in the form of a continuous nasty strand which required some dexterous, gloved handling but I got there. The best finish was at about one inch and deteriorated slightly as I approached the finished size.
IMG_20181003_161020931 (Large).jpg
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8th Oct 2018, 03:41 PM #36Golden Member
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BT,
That 12*12 holder that you have just received that is a bit narrow, could you use that overhang to do a light facing cut. I understand that you have purchased this holder to mainly use on your chipped edge inserts.
Bob
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8th Oct 2018, 05:12 PM #37Golden Member
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Thanks for the advice regarding these bits - I've been using them a lot on the 9" Hercus.
When you use those carbide bits as an end mill, is it very easy to smash them as you move into or across the workpiece ? - ie squaring up a face on the mill - cutter goes out over edge of face swings back in - hits the edge of the workpiece and smashes due to the interrupted cut ?
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9th Oct 2018, 08:48 AM #38.
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Hi Bill,
The photos below show the pretend Korloy being used as a fly cutter on some 1045 a reasonable distance from the spindle nose on my little mill. It was only a light facing cut but it was interrupted and the insert remained intact.
DSC_8705 (Large).jpg DSC_8708 (Large).jpg DSC_8715 (Large).jpg
Failure readily occurs if there any chance of movement in the work piece. An example is the 316 bar shown previously. Its 1 1/4" diameter wasn't perfectly round and required some light tapping at its outer end to enable the drilling of a "centred" centre hole. When it came to facing the end of the bar I used a half dead centre and a pointy DCGT 07.. pretend Korloy insert. I withdrew the centre to enable access to the very edge of the centre hole with the insert. Light contact was enough to create a wobble in the bar which resulted in snapping the end off the insert. They are fragile and need rigidity. I should have used a fixed steady.
To conserve these inserts I most often face the end of a non flat and square bar with HSS before using carbide. They don't fare too well in heavy interrupted cuts.
Bear in mind that these are my observations, others will undoubtedly have differing views.
Bob.
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9th Oct 2018, 02:14 PM #39Most Valued Member
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After seeing your earlier post maching the stainless and your current post is there any reason why you don't use your aluminium inserts for finishing if you have to, and normal ccmt inserts for roughing.
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9th Oct 2018, 02:43 PM #40.
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Peter,
If I had some more robust inserts I probably would do as you suggest, but I only have the high positive rake Korloys and the some six times the price, same rake Kennametal CCGT K5025 inserts. The Kennametals are slightly less prone to breaking and were intended for use on steel unlike the Korloys.
What CCMT inserts do use use? Brand, cost, etc....
Bob.
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9th Oct 2018, 03:30 PM #41Most Valued Member
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For the size lathe I have and the Hercus I use mostly 060202 and 060204 Seco, Mitsubishi,Valentine, Koroly and no name, can't tell you the grades but I cover steel,stainless and cast iron.I also use the ccmt for aluminium in ccmt,tcgt and dcgt.
Cost wise I normally go for cheapest, I generally have 400 plus inserts on hand covering turning and milling.
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9th Oct 2018, 07:00 PM #42.
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So, with Peter's suggestion of using a CCMT insert for roughing, I thought I would give it a go. The insert is of unknown Chinese origin, from a packet that they throw in when you buy cheap tooling on eBay. These inserts had previously been ignored by me because I had assumed their performance would be underwhelming
316 at 900 rpm with about .003" DOC and a gentle manual infeed. I don't know about roughing but not too bad for finishing!
Thank you Peter.
IMG_20181009_153825344 (Large).jpg IMG_20181009_153917172 (Large).jpgLast edited by Anorak Bob; 9th Oct 2018 at 08:09 PM. Reason: Added the bit in Italics
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