by Nicholas J. KorfiasClick image to enlargeby Nicholas J. Korfias

8 tips to maintain toolholder-machine spindle interface accuracy

A minute chip floating in coolant swarf left to dry on a toolholder taper can become a serious interference at the machine tool spindle-toolholder interface. It can go undetected, causing slightly increased cutter runout (TIR) and diminished tool performance at low spindle speeds. At higher spindle speeds, the negative effects are magnified and can result in scrapped parts, catastrophic failure and a possible accident.

A contamination-free toolholder and machine tool spindle interface ensures toolholders properly seat at full taper contact and are pulled into the spindle taper at maximum force. With holders held and positioned accurately, a machine's full power and tolerance capabilities can affectively and safely transfer to cutting tools, while runout and vibration are reduced for superior part surface finish quality.

The following are eight simple tips for maintaining toolholder-machine spindle interface accuracy and integrity.

1.Shops should clean and inspect toolholders and spindles after every job. Toolholders should be completely disassembled and cleaned. Today's synthetic and semi-synthetic coolants can leave surfaces gummy, causing chips and other contaminants to easily adhere to them. Machine spindles should be cleaned and visually inspected before being returned to service. An oil-dissolving cleaner can be used to clean coolant residue from toolholder and spindle surfaces.

2.Spindle cleaning should be done as part of the overall machine breakdown routine that happens after every job.

3.Dust-free cloths or paper towels with light penetrating oil and manual wiping tools work best for cleaning the spindle socket surface. Most manual wiping tools feature helical cleaning blades set at angles matching those of a machine tool's spindle. Once surfaces are cleaned, they should be sprayed with a coat of light penetrating oil to prevent rusting.

4.Shops should use a "ForceCheck" device to check their machine spindle's pulling power on a quarterly basis. This practice should be employed as a preventative maintenance procedure, with results recorded and tracked. Any sudden drops in pulling force from one quarter to the next can indicate a potential issue with the spindle system and can provide early detection for preventing catastrophic failure.

5.If possible, a tool crib manager or designated tooling person should manage toolholder maintenance. As jobs are completed and tools are returned to the crib, cutters and holders should be completely disassembled and all components

cleaned manually or in an ultrasonic system, then reassembled. Ultrasonic cleaning systems quickly and efficiently clean toolholder tapers, collet cavities, holder nuts, collets and all the other smaller
sub-assembly holder parts.

6.If toolholder tapers show visual signs of wear, manufacturers suggest running them through an automatic power-brush wiping system that uses rotating tapered brushes. After doing so, holders should be cleaned in an ultra sonic cleaning system, wiped clean and sprayed with a coating of light penetrating oil.

7.Once spindles and toolholders have been cleaned, a visual inspection should be made of the surfaces. They should be free of any defects. If serious damage is found in a spindle interface surface, a professional may be needed to re-grind the spindle taper socket. Damaged toolholder or machine spindle surfaces left dirty or unrepaired will, in turn, damage other tool and machine spindle mating surfaces.

8.Once tooling has been cleaned and properly maintained, store it to avoid any re-contamination as it moves from tool crib or tool cart to machine tools. Surface rust can occur while tools are stored, so they should always be sprayed with a coat of light penetrating oil. Shops should only load clean tool holders into machine spindles and automatic tool changing (ATC) systems. Again, dirty or damaged toolholder surfaces can easily transfer imperfections to other toolholders and onto machine spindle surfaces. SMT

Nicholas J. Korfias is a consultant at Rego-Fix Corp., Indianapolis, IN.

 

Holemaking MetalTech Report

Emuge
Multi-purpose tap
Emuge Corp.’s MultiTap is what the company describes as the industry’s first high performance tap designed to cut a wide range of materials including carbon steel, steel alloys, stainless steel, aluminum, cast iron, copper, brass, and bronze.

Targeting micro-parts

by Jim Barnes

The Problem: Increasing productivity

The Solution: Grooving, threading tools with better tool life and chip control

Tooling investment supports precision, profitability

 

Kennametal: Tapping into the wind turbine market

New high performance taps for large diameter tapping from Kennametal feature a wear-resistant powder metal substrate and proprietary top layers and coatings, designed wind turbine component machining of hubs, rings and gearbox housings.

Complex panel bending with Salvagnini PX4e

Watch the Salvagnini PX43 panel bender in action bending complex parts.

Copper welding with green wavelength laser

TRUMPF’s TruDisk 1020 with green wavelength facilitates the welding of copper and other highly reflective materials.

Seven real-life transforming vehicles

Here's a look at seven "transformers" that actually exist.

Sawing small

by Kip Hanson

For small parts, slitting saws are often a great alternative to end mills

Horrendous Holes

by Kip Hanson

Cutting super alloys can be a formidable machining challenge

Nickel and cobalt-based superalloys may not be Kryptonite, but drilling holes in Hastelloy X, Inconel 625, Waspaloy and Haynes 25 is about as tough as it gets in the world of metal removal. With machinability ratings in the low teens, these nightmare materials test the patience of even the most cool-headed machinist.

Ten of the world’s top construction megaprojects

A number of truly impressive construction megaprojects are nearing completion or have recently been finished around the world.

Automated part positioning with weld verification software

A product overview of Lincoln Electric’s Smart Positioner, which combines automated part positioning with step-by-step software enabled weld verification for control of large, complex weld assemblies.

Collaborative Welding Comes of Age

by Nestor Gula

Robots and humans working together for perfect pipe welds

Sandvik Coromant partners with auto tools maker

Sandvik Coromant has signed a partnership agreement with Hanna Tools that will strengthen Sandvik Coromant's global position in the automotive manufacturing industry.

Keeping it Simple

With all the hoopla over multi-tasking machines and turn/mill centres, it’s easy to overlook the back to basics importance of traditional CNC machine tools.

Avoiding the daily grind: Cutting hard metals

by Kip Hanson

The Problem: Achieving satisfactory tool life when machining 55-62 HRC steel alloys

The Solution: CBN-tipped turning, profiling, and grooving inserts

Alberta shop overcomes hardened steel machining challenges

WATCH: Smartphone manufacturing in China

OPPO has come out with its flaghip Android smartphone the R11. Watch how the phones are made at the OPPO factory in Shenzhen.

Stay In Touch

twitter facebook linkedIn