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Everything you wanted to know about the Microconic #Workholding System

10/11/2016

1 Comment

 
Matt Saccomanno, the inventor of the Microconic Workholding system discussed how it works at IMTS 2016.  

Masa Tool has developed the Microconic™ system specifically for holding workpieces from Ø0.15mm to 10mm (Ø0.006" to 0.390") in any machine that has a collet-type chuck.

The system consists of two major components: The Microconic™ cartridge, which fits into your CNC machine spindle replacing the standard 5C, TF20 or TF25 collets, and the Microconic™ collet, which fits in the Microconic™ cartridge. 

The Microconic™ system has unsurpassed concentricity: Our manufacturing tolerance is 3µm (.0001") and we guarantee our cartridges to be within 5µm (0.0002") in production use in your machine.

The Microconic™ system works with either draw-type or push-type standard collet systems that are in any machine.

​The Over-grip collet capabilities of Masa Microconic™ System, introduces a whole new world of time saving opportunities awaiting. Our Overgrip Collets open up to 4mm (0.157") diameter larger than the clamping diameter.
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Microconic Eliminates Collet Damage & Saves OVER $533 a Day!

6/16/2016

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The Chip Wrap Nightmare!
Superior Machined Products has decades of experience manufacturing implants, abutments, Multi fluted twist and spade drills, bone screws, analogs fixture mounts, all types of drivers and surgical tools

Superior brought in Masa Tool's Microconic F25M10 Cartridge and collets for use in sub spindle pickoff in producing dental implants.
Picture
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Chip wrap on dental implant
According to Juan Maravilla at Superior Machined Products Before the Microconic System was installed 

​
"An experienced machinist would bore a TF25 sub spindle soft emergency collet  in the machine in order to achieve good concentricity.  5% of the parts would experience chip wrap around the chucking area of the implant."
 
​"Every time the collet would chuck on the parts with chip wrap, it would leave an impression in the collet.  Sometimes the chip would stay lodged in that impression and the parts run from that point on are scrapped due to the chip impressions on the part and once noticed, the collet would need to be replaced."

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Cascading Failures stopped by Precision, Hardened & Ground Microconic UM collet for Dental Implant

9/30/2015

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Our customer was machining 6Al4V Titanium dental implants and scrap rates increased the longer our competitors collets where in use.  

This root cause was primarily result of cutting the threads in the main spindle.  Chips wrapped around the finished threads before the implant was handed over to the sub spindle collet for machining of the head hex and internal thread.

Collet wear & bad parts

The chip wrap of the dental implant part was periodic due to tool wear.  Clamping on the chips, that where wrapped around the implant in the TF25 sub spindle collet, led to two collet wear problems in less than 10,000 parts on a swiss screw machine:
  • Deformation of the ID clamping surface of the collet
  • Bell mouthing of the face of the collet
​Concurrently, there was a mushrooming of the Titinium head of the workpiece from the uneven clamping pressure due to the collet bell mouthing.  Scrap rates and collet replacement times where not predictable in a lights out production environment.
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Fig. 1: 6Al4V Titanium Dental Implant chip wrapping during threading on the main spindle
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Fig. 2: Bell mouthing of competitors collet after 10,000 parts
In the competitors collet, the Titanium material started to yield where the chucking occurred  (Fig.2) This caused an out of round situation and caused micro movement in the workpiece..
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Fig. 3: ID wear and damage of competitors collet after 10,000 parts.
The unpredictable periodic clamping on the wrapped chips on the workpiece embedded chip impressions in the collet (Fig. 3) which in turn marked the next part when it was chucked on. 

As a result the competitor's collet workholding lost it's chucking power from the bell mouthing in the front. By becoming out of round, parts lost their concentricity.

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