Are you using a drill Press? I have used off the shelf High Speed Steel bits to drill steels like D2 and all manor of stainless steel including ATS34 so you shouldn't be having any problems with Carbon Steel.

Using the M8 screw example above, the screw has a Thread Pitch of 1.25mm. ... M3, 0.50, -. M3.5, 0.60, -. M4, 0.70, -. M5, 0.80, -. M6, 1.00, -. M8, 1.25, 1.0.

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Collets may be small in size, but their impact on CNC machining is immense. By choosing the right collet type, providing proper maintenance, and knowing when it’s time for a replacement, you can ensure your CNC operations run like clockwork, producing high-quality parts with precision. Remember, meticulous care of your collets is the key to unlocking the full potential of your CNC machines.

You may want to go over and hang out at somebodies shop and see if your missing a step in the process as its pretty hard to guess about without watching you work.

If you decide to get carbides, I would recommend that you get straight fluted bits. They are much more durable than the twisted ones.

I asked a similar question years ago, and was informed I needed to learn to sharpen drill bits... For 1/8th inch and up, its not that difficult, anything smaller it tough to get right. Also, it sounds like your steel is still somewhat hard. If a standard anneal doesn't do the job, try a sub-critical anneal. Basically you heat it up to just under critical, hold for a minute, then let it cool. It amounts to a very high tempering cycle, and is really good for L6, o1, and other deep-hardening steels that tend to air harden in thin sections.

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Collets are made to deteriorate with time. They become less accurate as they age, which can cause chatter and shorten the life of the cutting tool. A decent general rule of thumb is to replace collets every 4–6 months.

I've tried about everything I can find locally and just can't get a drill bit that will cut through tangs and whatnot very efficiently or at all. I finally got a drill press which helped a lot, also found a cobalt bit near here and with the 2 I was finally able to drill a couple of holes for pins in some of the knives I'm working on and then it just stopped, can't get it to cut for crap anymore and I thought I was finally on a roll. I've heard carbide bits will do the trick but I can only find them for masonry. Any help would be greatly appreciated.

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I hope this blog post was useful. Please feel free to leave a comment below if you have any additional inquiries concerning collets.

O1 may be the worst steel to drill that I've experienced, 5160 and L6 are not much better. If you're going to be using these steels on a regular basis, carbide bits might be a good investment. Go slow and light, and use lots of cutting fluid.

Smaller than 1/4" I.C.. B, C, H, J - countersink is between 70 - 90 degrees. ** Exact tolerance is determined by the size of the insert.

Jun 25, 2021 — Get a device called a Tapered Bridge Reamer with a 1/2 shank. They work exceedingly well and leave a pretty nice finished hole. They come in ...

May 2, 2019 — Another way to do chamfers is to use 2D Contour operation. From the 2D menu, select the 2D Contour operation. Select the chamfering tool. Go to the Geometry ...

Collets must be replaced when they have bell-mouthed or show signs of fretting on the O.D. Additionally, it must be replaced when it no longer effectively secures the cutting tool or creates excessive chatter.

Even with proper maintenance, collets are bound to wear out over time. To avoid compromising the precision of your CNC machining process, watch out for these red flags that signal it is time to replace your collets:

Thanks GEzell, I think that pretty much answered it, I've got the steps to drilling holes down years ago in machining class, but I think the main problem was the cutting speed and the lack of cooling fluid. I had just gotten the drill press and was excited about it and started playing with it on the setting it came in, which was the middle setting, but I had already worn out the bit before I realized to change it to the slowest setting. Plus I only dipped the bit in oil once before starting. The steels I was drilling at the time were o1 and 1095. I got another of the cobalt bits to try angain yesterday but this time I'm just going to take it slower and easier and see where that gets me. If that still goes dull too fast I'm just going to have to order some carbide ones, I just hate ordering things. Thanks for the advise fellas!

ER Collets — The most flexible type of collet is the ER collet. They can be used to handle a variety of shank sizes for cutting tools. Since they are reasonably priced and easily available, ER collets remain the collet of choice for CNC machinists.

If your chipping off the tips of your edge and breaking bits your probably trying to drill to fast. If they are dulling up then you may need to work harder to keep the bit cool.

We would love to know your favorite among the three types of collets that we discussed. Tell us why you ended up adopting the collet nuts in your tooling inventory or how you mastered the art of using the CNC collets for your DIY machining projects.

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I have used this afternoon a carbide drill bit to enlarge a hole in the tang of a hardened stainless steel kitchen knife. They work very well for about everything!

CNC collets are an essential component in machining, responsible for holding the tool in place and ensuring precision and accuracy in the cutting process. There are several types of CNC collets available, each with its own unique features and uses. In this article, we will explore the different types of CNC collets, including ER, TG, and DA collets, and their applications in machining. Whether you are a regular machinist or a beginner in the tooling industry, this article is a must read; it will not just help you identify the different types of collets available in the market, but it will also provide some useful tips on how to maintain your existing collets and know when to replace them with new ones.

Going back and reading your original post, you may want to find yourself a good drill bit sharpener. There are a few real good ones I have seen lately come onto the market.

TG Collets — TG collets are more accurate than DA collets because they have additional faces that hold the cutting tool shank. However, the price of TG collets is comparatively higher.

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Collets are tools that are subject to wear, corrosion, and abrasion over a period of time. Gradual damage and wear can lead to loss of accuracy and functioning and may result in poor quality or interruption in your CNC machining operations. Therefore, it’s critical to maintain and take proper care of collets to ensure their longevity and optimum performance. Here are some pointers on caring for collets:

Tangs should never be hard, not in my experience anyway. The softer the tang the less likely it is to crack or shatter during hard use. If your tangs are hard you may want to look into your heat treat and tempering.

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Something else that works for me when you get the hole started then it stops cutting. Make a small punch with a 4-sided point, and punch inside the hole with it. for some reason, it helps the bit grab better, enough to finish the hole...

Collets are chucks that are required to hold the cutting tools in CNC machines. Mostly, they are constructed of hardened steel, and the O.D. is tapered so that it fits inside the tool holder perfectly. The collet expands and encircles the shank of the cutting tool as the collet nut is tightened.

You could always put the blade in water and soften the tang with a torch, but might not be doable depending on your goal.

Double-Angle (DA) Collet — It is the most basic type of collet. It holds the shank of the cutting tool with two opposed faces. Although Double Angle collets are inexpensive, they offer less precision and efficiency.