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Remember to Replace Your Spindle Cleaners Regularly

8/9/2017

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Guest Blog: Douglas Sumner
Product Manager TMS
​BIG

douglas.sumner@us.bigkaiser.com
Tel: 224.770.2915

Remember to replace your spindle cleaners on a regular basis so that you aren't using worn out cleaners. What you think is helping to preserve your valuable Machine Tool/Presetter might actually be hurting it.

​When replaced regularly, spindle cleaners can prolong the life of your machine, tools & holders, and tool cleaners enhance the repeatability to the machine spindle. This is a perfect example of how a small investment can make a big impact.
CAT BT Toolholder taper cleaners
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Next Generation Tooling Now Offers Technical Training!

6/14/2017

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We are very excited to announce that we are now able to offer on-site technical training to YOUR machinists at YOUR location!  This is offered at no charge  to customers who use any of the manufacturer's whom we represent in California and Nevada.  

However, just because you don't purchase things from us, don't feel left out! We also offer on-site topic specter training on any of the following topics for $150/hour.  

Each presentation lasts about 2 hours.  The presentations last approximately 45-60 minutes with the remaining time for Q&A and discussion about unique applications in your facility.
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Training Classes Available:
Machining 101
  • Basic Boring
  • Basic Chamfering
  • Basic Drill Training
  • Basic End Mill
  • Basic Indexable
  • Basic Tap Training
  • Basic Tool Holders
  • Basic Work Holding / Fixturing​

Advanced Part Manufacturing:
  • Programming Tool Path – Climb versus Conventional
  • Material Machinability – Cubic Inches of Stock Removal
  • Part Set Up / Work Holding / Fixture 
  • Tool Holder Selection, Collet, Solid, Hydraulic, Shrink Fit
  • Cutting Tool Selection – Substrate, Geometry, Coating, Speed and Feeds 
  • Estimating Part Cycle Time
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What does an AT3 Taper Tolerances Mean on a Rotary Toolholder?

8/20/2014

1 Comment

 
As the CNC manufacturing industry continues to grow we're meeting more and more new people coming into our industry.  

​Although many experienced machinists have lots of knowledge, we're finding that the new people are asking questions about some things that may be common knowledge to the old hands.

One of the questions relates to "Why the heck is the cone on the toolholder the angle that it is?" We're here to help answer that....

By now, many have undoubtedly heard that most steep taper (CAT, BT) Toolholders hold an AT3 taper tolerance or better. So what exactly is AT3?

Steep Taper, Fast Tapers & Locking Tapers

Before we get into the tolerance and specs it's important to understand that there are basically two classes of tapers: 
  • Locking tapers - These can be at any angle less than 7° per side (14° included). The shallower the angle the better the holding. 
  • Self Releasing or "Steep Tapers" - These tapers are typically made with short shanks and with an included taper angle of 16° or 3.5" (88.9 mm) per foot.   These are also sometimes called "Fast Tapers".
  • Toolholders are 'case hardened".
  • Taper fit to spindle is critical.
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Most of the taper standards originated in the early days of the aircraft industry with rotors and propellers. There's quite a bit of thought that went into why the two types of tapers exists: It has a lot to do with "Van der Waals Forces" if you want to know about it in more detail.
​ 
What's important to know is that CNC spindles are made with Steep Tapers. Why? Well, just as the two names state the first is "locking" taper and the second is "free-releasing"  

Since Toolholders have to be automatically changed in the CNC machine you want them to be as close to a locking taper as possible (8°/side) without, well, 'locking' in place (7°/side)!  This is also the reason the ER/DR style collets also are made to an 8°/side angle as well by-the-way.

What is an AT3 Taper Tolerance?

That brings us to the "AT" standard for steep tapers. "AT" is an ANSI/ASME (ASME B5.50-1994) and ISO Standard (ISO 1947 ) that runs from AT1 to AT11. Since the AT tolerance is essentially logarithmic, the lower the number the tighter the tolerance (and harder it is to 'hit' in manufacturing). In other words the difference between AT 3 and AT4 is NOT the same increase in tolerance as between AT3 and AT2. AT3 is harder to attain than AT4 and AT 2 is substantially harder to reach than the jump from AT 4 to AT3. Again, the lower the number, the tighter the 'self releasing' tolerance.

Most CNC Machines steep taper spindles are made to an AT2 Specification. In order to stay competitive most all toolholder manufacturers are holding an AT3 tolerance (or better). Because there are much fewer spindles made than rotary toolholders this makes manufacturing sense.  The key words here to pay attention to is "or better"  Just like when you make parts in your shop to a tolerance, that doesn't mean that every part is exactly the same.

​The parts are within a tolerance band. That's what the "AT" defines!  So when a toolholder manufacturer says "AT3 or better" that can mean that some of the holders are actually holding an AT2 tolerance... and this is sometimes the cause of the tolholders 'sticking' in the spindle:Not because they are out of tolerance, but because they are actually holding a closer tolerance! (...nearer a locking taper)

By-the-way, most all steep taper toolholders are made from some derivative of 8620 steel and then case hardened.

Steep Taper Rotary Toolholder are Taper Driven

So although most people think that the drive dogs on the spindle are doing the 'driving' of the rotation of the toolholder, it's actually the taper connection that is driving the rotation of the tool. If that wasn't the case, then you would see the drive dog notches in the toolholder start to show signs of wear when the spindle impacted them all the time. Afterall, the 8620 is only case hardened.

There are a couple of last things to make note of and think about:
  • HSK Holders also have a taper but how they work is a bit different.  Check out: Alternatives to steep tapers.
  • If you over-tighten your retention knob (pull stud) it can expand the smaller part of the taper.   But that is a subject for another day.

Some further reading:
  • Evaluating your CNC Rotary Toolholders for Wear & Fretting
  • RotaryToolholders: Understanding the problems to watch
  • Rotary Toolholder Maintenance Best Practices
  • A Practical Tutorial on High-speed Tool Holders
1 Comment

    Technical Support Blog

    At Next Generation Tool we often run into many of the same technical questions from different customers. This section should answer many of your most common questions.

    We set up this special blog for the most commonly asked questions and machinist data tables for your easy reference.

    If you've got a question that's not answered here, then just send us a quick note via email or reach one of us on our CONTACTS page here on the website
    email us

    Authorship

    Our technical section is written by several different people. Sometimes, it's from our team here at Next Generation Tooling & at other times it's by one of the innovative manufacturer's we represent in California and Nevada.

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Established 1995
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Next Generation Tooling
10240 Cavalletti Drive
Sacramento CA 95829
916.765.4227
Northern California
23 Maxwell Street
Suite B
Lodi, CA 95240
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22343 La Palma Avenue
​Suite 126
Yorba Linda, CA 92887
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  • Home
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  • About
    • History
    • Contact
  • Territories
    • NorCal & N-NV
    • SoCal & S-NV
    • Mountains
  • Principals
    • Tooling >
      • 2V Industries
      • BIG Daishowa
      • Champion Storage
      • Drill America
      • Jewell Group
      • Mapal
      • Martindale Gaylee
      • OSG Tool
      • Performance Micro Tool
      • Platinum Tooling
      • TechniksUSA
    • Workholding >
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      • Earth Chain
      • Jergens
      • mPower Workholding
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  • Technical