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Comments on ER11 Collets

ER11 Collets

ER11 Collets

The new 24K RPM spindle has an ER11 style collet holder. Attempting to measure the TIR (Total Indicated Runout) is not possible with the measuring tools available at THMS. It should be well under 0.0004 inch.

With ER collets, TIR of .0006” (.015MM) is considered Class 1, .0004” (.010MM) – Class 2, and .0002” (0.005MM) is Class AA (5 microns). Of course, the cost increases with accuracy. Class 2 and higher is my recommendation. A holder with excessive TIR negates this accuracy.

The internal surface of the holder looks well finished. I am going to depend on the… Continue reading

24K Spindle Video

The 24,000 RPM water cooled spindle on my Taig Micro-Mill is operational.

The power required to do wax milling with 0.004″ milling bits is extremely low. I use my old settings of 10,000 rpm and 10 IPM travel on the first run. The no load current on the spindle is 0.6 amps. While making the first carving the spindle ran at 0.6 amps. It was as if there was no load on the spindle motor.

The next run as shown in the video was at the recommended limit of the 0.004 inch tapered mill bit. The run shown is 15,000… Continue reading

Just Add Water

The water cooling has been added to the high speed spindle through the red tubes in the picture. This is phase one where I will be using a reservoir with a sump pump behind the bench.. This should let me operate for maybe an hour or so. I don’t have any idea how much and how fast the water will warm.

The next step in the water cooling will be to add a closed loop system with a radiator to move the heat out into the ambient air rather than store it in the water tank. But first I need… Continue reading

24K Spindle Progress

The parts arrived yesterday. Exactly as shown in the previous post. I placed an order for some four conductor cable for the wiring between the Variable Frequency Drive (VFD) and the spindle motor.

I needed to see the clamping size of the spindle’s electrical plug connector. I didn’t want to select and order a cable that would not fit. The cable is on they way to me, so I created the adapter I needed to mount the new spindle on the Taig Micro-Mill.

The picture shows the results of my work as the spindle is now nicely mounted on the… Continue reading

High Speed Spindle

Here in the RD workshop, consideration is being made on adding a one horsepower 24,000 RPM spindle to the Taig CNC Micro Mill. The standard spindle is a belt drive one quarter horsepower unit with a top RPM of 10,000.

The standard spindle and drive is quite adequate for most of the milling work the micro mill is asked to produce. The primary use for one of my mills is wax carving with as small as 0.003-inch milling bits. That size mill bit can best operate at the 10K RPM and higher ranges.

I did some comparison of speeds and… Continue reading

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