Getting the indexable turning tool　スローアウェイバイトを入手

I finally got my hands on the indexable turning tool that had been a long-standing issue.
Up until now, I’d basically been using handmade brazed carbide tools, but every time they chipped, I’d have to resharpen them. That would change the cutting performance, take a lot of time, and make it hard to maintain consistent dimensions.

長年の懸案だったスローアウェイバイトを手に入れた。今までは、基本的には手作り超硬ロウ付けバイトを使っていたんだが、チッピングを起こす毎に研ぎなおして、そうすると切れ味が変わったりして、時間もかかるし寸法も安定しない。

On the other hand, there are so many manufacturers of lathe inserts, and they come in all sorts of shapes, sizes, materials, and coatings. On top of that, the insert holder you need obviously depends on the shape and size of the insert. It’s hard to decide on any of that when I haven’t even used them yet.If I could at least narrow it down by manufacturer, that would really help.

一方で、旋盤用チップって、メーカーも沢山あるし、形状もサイズも材質もコーティングも様々、その上、当然どの形状、サイズのチップを使うかによってチップホルダーも変わる。そんなの、使ってもいないのに中々決められない。
せめてメーカーを固定すればぐっと絞り込めるんだが。

The other day, I was talking to a friend who works in production engineering at Fuji Heavy Industries, and he told me Kyocera has a good reputation, so I’ve settled on them. Now I just need to consult with GEMINI to finalize the specifications.
AI can be quite a hassle—it’ll casually recommend model numbers that don’t even exist—but it’s helpful when it offers suggestions with explanations, like “This carbide model is best for your machine” or “This coating is suitable.” Here's an example of a conversation with Gemini. (It's a bit long, though.)

Is the CA115P suitable for rough machining?
To put it simply, the “CA115P” is an excellent choice for rough machining (skinning) of S45C steel, as both its performance and actual availability (manufacturing) have been confirmed by the manufacturer. However, when using a bench lathe, its sister grade, the “CA125P,” is safer (more reliable) and therefore recommended. I will explain the catalog specifications, actual model numbers, and precautions specific to bench lathes.

1. Features and Verification of CA115P This is the latest “CVD-coated carbide for steel machining” grade released by Kyocera in recent years. Performance: It is highly specialized for wear resistance and possesses the strength to withstand high-speed, heavy-duty cutting without the cutting edge losing its edge due to heat. New breakers (such as PMG) for medium to rough machining are also available, making it perfectly suited for roughing operations.
2. Why is “CA125P” better suited for bench lathes? Kyocera clearly distinguishes between two grades in this series. CA115P: For continuous to light intermittent machining (emphasis on wear resistance and tool life) CA125P: For continuous to heavy intermittent machining (emphasis on chip resistance and toughness) Rough machining on bench lathes (especially deburring) creates an environment equivalent to “heavy intermittent machining (severe impact)” for the cutting edge, as the machine’s power is low and chattering is likely to occur. While the CA115P is extremely hard and wear-resistant, it tends to chip more easily than the CA125P when subjected to rattling vibrations or impacts. Therefore, if you have a choice when purchasing, selecting the tougher and more resilient CA125P will help your inserts last longer during rough turning on a bench lathe.

I don't think I could come up with search results like this without AI.

この間、富士重工の生産技術職の友人と話していて京セラが評判良いと聞いたので、これで固定。後はジェミニと相談しながら仕様を決める。
AIって、存在しない型番を平然と推奨してきたりして中々厄介だけど、あなたの機械だと超硬の型番はこれがいい、とか、コーティングはこれが向いてる、とか解説付きで提案してくれるのは助かる。ジェミニとのやり取りはたとえばこんな感じ。（ちょっと長いが）

粗取り用にCA115Pは?
結論から申し上げますと、「CA115P」はS45Cの粗取り（皮むき）用として、メーカーの性能・実在（製造）ともに確認が取れた、非常に優れた選択肢です。ただし、卓上旋盤での運用においては、兄弟材種である「CA125P」のほうがより安全（無難）でおすすめです。カタログスペック、実在型番、および卓上旋盤ならではの注意点を解説します。

1. CA115Pの特徴と実在検証京セラが近年発売した最新の「鋼（ハガネ）加工用CVDコーティング超硬」の材種です。性能: 耐摩耗性に極めて特化しており、高速でガシガシ削っても刃先が熱でへたらない強さがあります。中〜荒加工用の新型ブレーカー（PMGなど）も同時に展開されており、粗取りへの適性は完璧です。
2. なぜ「CA125P」のほうが卓上旋盤に向くのか？京セラはこのシリーズにおいて、2つの材種を明確に使い分けています。CA115P：連続〜軽断続加工用（耐摩耗性・寿命重視）CA125P：連続〜強断続加工用（耐欠損性・粘り強さ重視）卓上旋盤での粗取り（特に黒皮むき）は、機械のパワーが低くビビリが発生しやすいため、刃先にとっては「強断続加工（激しい衝撃）」と同じ環境になります。CA115Pは非常に硬く摩耗に強い反面、ガタガタという振動や衝撃が加わると、CA125Pに比べてパキッと刃先が欠け（チッピング）やすい傾向があります。そのため、もし購入される際に選べるのであれば、より粘り強くタフな CA125P のほうを選択するほうが、卓上旋盤の荒削りではチップを長持ちさせられます。

こんな検索結果をAI抜きでは引き出せる気がしない。

After discussing the options while considering factors such as availability and price, we settled on an 80-degree rhombus-shaped size 06 positive insert to suit our low-power, low-rigidity bench lathe. We selected the CCMT060204-PP-CA125P insert for roughing and the CCET060202MFR-U-PR1225 insert for finishing. We also acquired a Kyocera 10x10mm peripheral tool holder and a 12mm boring bar.

入手性やら価格も考え合わせて相談しながら詰めていって、非力で低剛性の卓上旋盤に合わせて80度ひし形06サイズのポジチップに決定。荒取り用チップをCCMT060204-PP-CA125P　仕上げ用チップをCCET060202MFR-U-PR1225とした。合わせて、京セラの10X10ｍｍの外周用ホルダーとΦ12のボーリングバーも入手。

First, I tested it on a 20KO bearing housing. The material is raw S45C (AISI 1045 equivalent) round bar.
Roughing insert: CCMT060204-PP-CA125P
It’s incredibly tough. I don’t think my lathe could even cause chipping on this. If I treat it strictly as a roughing tool, the cutting performance isn’t bad. At first, there was some chatter, but it seems it doesn’t perform well unless I run it at a slightly higher speed. When I switched to the high-speed gear on the lathe—which I’ve never used for steel before—it produced blue chips and cut through the material with ease.

まずは、20KOのベアリングハウジングでテスト。材質はS45C生材。
荒取り用チップCCMT060204-PP-CA125P
なんせタフ。うちの旋盤では、チッピングなんて起こせる気がしない。荒取りと割り切れば、切れ味も悪くない。最初、びびるなー、と思っていたが、どうも速度を上げ気味にしないと機嫌が悪いようで、今までスチールでは使わなかった旋盤の高速ギア側だと青いキリコを出してバリバリ削れる。

Finishing insert CCET060202MFR-U-PR1225
This thing cuts like a dream. It feels great. Even when you need to cut just another 0.005 mm, the blade cuts through reliably. This makes it easy to achieve precise fit dimensions. As long as you handle it with a little care, I don’t think there will be any issues with durability.
仕上げ用チップCCET060202MFR-U-PR1225
これは、切れる。気持ち良い。あと5/1000ｍｍ切り込みたい、なんて時も、確実に刃が入る。これならはめ合い寸法も簡単に出せる。若干丁寧に扱えば、強度も問題ないと思う。

Since there are some shapes that can’t be machined with this alone, I still use my handmade cutters.
これだけでは削れない形状もあるので、今までの手作りバイトも現役。