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### Question #: 872

Question: What is the benefit to using a spindle over a standard router?

Current Solution

This solution will refer to the water cooled spindles that we sell. Generally, routers are air cooled which push air downwards through the router to cool the router motor. This has an undesirable effect for CNC machines that will blow the dust and chips into the air. The water cooled spindle will not blow since it uses water to cool the spindle motor. This allows the chips and dust to be confined within the dust shoe and get removed by the vacuum. Additionally, standard routers have a sound level that far exceeds that of the spindle.

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### Other Possible Solutions to this Question

• I own a blacktoe 2x4 cnc. I need to convert to 2.2kw spindle. I cuurently am using the porter cable router spindle.Thanks.

We will have to replace the motor mounts that the router currently is mounted to. The process is easy we will need to communicate, through our email or over the phone.
@:customerservice@gmail.com
#:281-851-7701

• I own a blacktoe 2x4 cnc. I need to convert to 2.2kw spindle. I cuurently am using the porter cable router spindle.Thanks.

If you would like to use a spindle rather than a router on your existing CNC, we will send you another set of components that will allow the spindle to be mounted properly which includes the z-axis rails, rail support, spindle mounts and the dust shoe components. You can find this item to purchase here: https://www.buildyourcnc.com/category/z-axis

• What is the cut accuracy of the large format routers using roller chain? .005"?

Accuracy is generally function of how well the machine will match the measurements of what is designed on a computer on a computer. However, if you are looking for the resolution of the machine, you can calculate the steps per inch using the formula:
Steps / inch
= ((motor steps) * (micro steps)) / ((tooth pitch) * (number of teeth))

Depending on the micro steps and the drive sprocket (or drive pulley) you are using, you can achieve a wide range of resolutions.

With our machines, you can easily achieve .001 resolution, but accuracy will be best achieved with proper calibration.

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What is the cut accuracy of the large format routers using roller chain? .005"?

• I currently own a blacktoe router cnc.Want to convert to spindle.Do I use the same Z axis mount?

You will not be able to use a router mount for a spindle. You will need to get a spindle mount for your Z axis.

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I currently own a blacktoe router cnc.Want to convert to spindle.Do I use the same Z axis mount?

• Is the 4kv spindle constructed using two or four bearings and what size collets are included with the spindle/vfd combo?

Yes, all of the spindles come with collets. The collets have a 1/4" (6.35mm) bore for end mills that have a 1/4" shank. The ER specification is different for the 1.5kW (ER-11) and the 2.2kW (ER-20).

• Is the housing grounded through the ground pin on the spindle connector

The protective earth should be connected to the spindle housing in some way. Sometimes the 4th pin is already connected to the housing, but not always. It is always good to check by removing the 4 screws of the connector to confirm this. If it is not, you can use one of the connector screws as a way to connect the PE to the spindle housing. The screws of the connector has a direct connection to the housing of the spindle.

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Is the housing grounded through the ground pin on the spindle connector

• Is the 4kv spindle constructed using two or four bearings?

We are posing that question with the supplier. The information will be provided shortly.

The 4.0 kW spindle has 4 bearings. Tow of them are 7005C and the other two are 7003C

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Is the 4kv spindle constructed using two or four bearings?

• Okay guys, what fluid are you using for the spindle to keep them cool? do you recommand anything else beside water for the spindle?

We have always used water for our cooling, but since this is a heat transfer condition, you should be fine with any form of coolant.

We live in a cool part of the USA. My CNC is in an unheated garage and temperature gets to -10 degrees Fahrenheit. So we use 100% anti-freeze that is used for winterizing campers. Use same coolant year round. Put 3 gallons in a bucket with fish-tank pump, and it works great. Since there is 3-gallons of coolant, no need for fans to cool the coolant. Just pump from tank to spindle back to tank. And no worry about frozen coolant.

• Hello what is the thread size of the water cooling fittings on the 2.2kw spindle? I am wondering if I can replace the fittings with standard pc liquid cooling fittings, which are G1/4".

They do have a similar looking thread as the G1/4”, but I will confirm in the morning. We use the G1/4” on the pump and radiator so it will be easy to determine this fit when I get into the office.

Another FAQ says it is an M8, but I will confirm.

These are M8x1 thread. I was able to find M8x1 3/8 barb fittings on Ebay. I plan to drill and tap my spindle to G1/4 though.

• Do I need Z axis mount for spindle? I currently have router cnc blacktoe

You will need a Z-axis mount for Spindle if you are currently using a router.

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Do I need Z axis mount for spindle? I currently have router cnc blacktoe

• What are the noise levels of the 1.5 Kw and 2.2Kw spindles?

The noise level of the 1.5 kW and the 2.2 kW are very similar. The noise level is considerably quieter than typical routers. I am going to add sound db levels to this FAQ a bit later.

The db (decibels) reading for the spindle is 70 and an 890 Porter Cable router (a lower powered tool than the spindle) measured 90 db. Both measurements were taken in the same environment and measured at the same distance from the tool.

Practically silent. The inverter makes more noise!

Practically silent. The inverter makes more noise!

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What are the noise levels of the 1.5 Kw and 2.2Kw spindles?

• What brand is the 2.2 kW spindle? Same for the VFD. Thanks.

Spindles are generally covered up to 1 year after date of purchase. We do not repair them in house, but we do work with our manufacturer to replace defective units. Generally if you have a defective unit covered under warranty, we will issue a replacement.

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What brand is the 2.2 kW spindle? Same for the VFD. Thanks.

• WHAT ARE THE OUTPUT INVERTER (VFD) CONNECTIONS TO SPINDLE?

U - Pin1
V - Pin2
W - Pin3

My home made cnc is a big problem with my NC connection. When in start my spindle it will be gone wrong. It will be limith switch problem anytime. Need help thanks.

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WHAT ARE THE OUTPUT INVERTER (VFD) CONNECTIONS TO SPINDLE?

• What is the runout on the 2.5 KW spindle and how many bearings?

The runout on our 2.2kW spindle and number of bearings are:
Radial runout: 0.01mm - 0.000393701 inches, 3 Bearings

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What is the runout on the 2.5 KW spindle and how many bearings?

• What size of wire do you use to connect the VFD to the spindle?

The type of wire that should be used between the spindle and the VFD (Variable Frequency Driver also called the inverter) should be of stranded type and we use between 18 and 16 AWG.

The total current is divided among the three coil wires, therefor a wire gauge of 16 should be sufficient.

Currently we use 20AWG 4 conductor.

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What size of wire do you use to connect the VFD to the spindle?

• what is the packing list for the laser/spindle combo head

The laser/spindle combo head includes the following major items:

Spindle components:
- The Spindle and VFD (Variable Frequency Drive) also called an inverter.

Laser components:
- 40 watt laser tube.
- Laser nozzle with laser focus lens (20 mm).
- nozzle tube fitting with 36 inches of silicone tubing.
- 40 watt laser power supply.
- Potentiometer (panel mount) to adjust laser intensity.
- Toggle switch (on/off SPST - Single Pole Single Throw).
- Air pump to provide air assist to keep debris out of the nozzle.

Structure and hardware:
- All structural parts to form the z-axis rail support and mounts for the spindle and laser tube/nozzle, vacuum hose and dust shoe
- 1/2" - 10 TPI 5 starts lead screw (2 turns per inch).
- Many screws/nuts/cross dowels.
- Dust shoe with installed strip brush.
- Aluminum angle to serve as rail.

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what is the packing list for the laser/spindle combo head

• What is the maximum runout on your water-cooled spindles?

TIR specifications for the ER-20 collet used on 2.2KW Spindles is .0004 inches.

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What is the maximum runout on your water-cooled spindles?

• What is the rpm range of the 2.2kw spindle and inverter?

The VFD is capable of a maximum of 400 Hz frequency. That converts to 24,000 RPM for the spindle. The minimum frequency is 100 Hz which is 6000 RPM.

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What is the rpm range of the 2.2kw spindle and inverter?

• The pin configuration on my spindle’s connector. It is not clear what number references which pin.

1, 2, and 3 will be used. They connect to the U, V and W connections on the VFD. I would actually use a shielded cable as this cable is used with motor coils and will definitely send off EMF. Connect the shield to the earth ground terminal in the VFD.

If the spindle spins in the wrong direction than expected, just swap two of the U, V, W wires on the VFD. It doesn't matter which two of the three wires.

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The pin configuration on my spindle’s connector. It is not clear what number references which pin.

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