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Nitto Kohki Auto Mag Drills

nitto kohki mag drill

Nitto Atra Ace portable magnetic base automatic drilling machine:

We love to work with Nitto Kohki with their line of automated magnetic drills.

Advanced Technology Reducing Hole Drilling Cost.

nitto wa 3500 load detection

Some of the features of the Atra Ace auto magnetic drilling machines are:

• Overload stop detection system helps prevent motor and cutter damage

• Load detection system monitors and regulates motor speed and cutting feed for optimal drilling condition.

This system will improve your productivity, improve the cost per hole and provide longer tool life.




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Tialn Coated HSS Annular Cutters

tialn coated mag drill bit

When producing holes through harder materials like stainless steel – it is recommended to use a harder annular cutter to increase tool life and keep the drill speed up to the optimal rpms.  The Bison Tialn coated annular cutter makes that affordable.

TIALN COATED:  Titanium Aluminum Nitride ( TIALN) is a thin film coating that was developed from Titanium Nitride.  TIALN offers higher temperature resistance than TIN, as well as slightly higher hardness and especially higher hot hardness.  This coating works by forming a thin surface layer of Alumina ( AL203), or Aluminum Oxide ceramic.  As the layer wears it continuously reforms.

–  Is harder than carbide and chrome on the Rockwell C scale

– Is dense and non-porous

– Tools typically last 3-10 times longer than uncoated tools.

Use this coated tool for longer tool life or for cutting harder materials such as stainless steel, harden steel, etc.  Does not require very much lubricate, in fact, the hotter the material is processed, the better the coated tools work.

M2  High Speed Steel:

  • Hardened & Precision Ground
  • 3/4″  Weldon Type Flat Shank
  • Traditional V & Flat Dual tooth Design
  • Pilot Pin comes with each cutter and is included in the price

What is the purpose of coated cutters, or cutters made from premium steel?
Cutters made from M2 high-speed steel (HSS) are recommended for materials with a Brinell hardness number (BHN) of up to 275. A titanium aluminum nitride (TIALN) or similar coating may be applied to M2 to fortify wear resistance in materials up to 325 BHN. For materials up to 350 BHN, cobalt steel (M42) is recommended with a titanium nitride or similar coating.

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Recently install our third annular cutter sharpening machine

hougen sharpening servie

With the high demand for our sharpening service for the annular cutter bits we decided to add the Hougen 10950 magnetic drill cutter sharpener.

The Model 10950 has been specifically designed for resharpening Rotabroach “12,000-Series” and Rotaloc Cutters. Provides ease of operation while restoring original factory specified tooth geometry.

This machine is great for the Hougen 12,000 series cutters and we also have the fixture to sharpen the Hougen Rotoloc and the Hougen Rotoloc Plus cutters.

With this new machine we able to decrease our lead times for the sharpening services and also provide excellent results with all the different Hougen annular cutter geometries.

Give us a try and you will be very happy with your newly sharpened cutters.



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how does the pilot pin work on annular cutters

how does the pilot pin work

Annular cutter pilot pins: How they work…

Center hole for pilot pin accurately aligns the cutter, allows for internal lubrication and removes the slug.

The pilot pin allows you to accurately position the cutter. During drilling, the pilot pin retracts and allows internal coolant to reach the cutting teeth.

When the hole is complete, the slug is automatically ejected from the cutter.

1. Centering: The Pilot pin accurately centers cutter over area to be drilled.

2. Oiling: During drilling, the pilot pin retracts and allows internal coolant to reach the cutting teeth.

The cooling of annular cutters is internal. The internal lubrication is provided through a hole with the help of a pilot pin.

Internal lubrication makes the annular cutter faster and more efficient for deep hole drilling

3. Ejecting: When hole is complete, the slug is automatically ejected from the cutter.




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Metal Drill Feeds and Speeds

metal drill speed settings

Metal Drill Feeds and Speeds

Different drilling conditions make it impossible to develop any rigid rules for feeds and speeds when drill metal materials

The following tables contain guidelines that can be utilized when drilling standard metal materials.

Also, the following “rules of thumb” can be used to determine proper feeds and speeds for drilling ferrous materials (note: varying conditions can easily require adjustments):

• Feed equals .001″ per revolution for every 1/16″ of drill diameter, plus or minus .001″ on the  total

• Speed equals 90 surface feet per minute in 100 Brinell hardness material, and the speed be reduced 10 surface feet per minute for each additional 50 points of Brinell hardness.

• Feed and speed rates should be reduced up to 45 to 50% when drilling holes deeper than 4 drill diameters.