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These guides and questions explain advanced milling topics. Make sure you've completed 2.3 CNC Milling with BoXZY before moving on to these guides.

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65mm water cooled spindle reduce the integrity of travel and bearings?

I was able to mill on a 0.25” 440C stainless. It was kind of rough due to the minimum RPM the router has (9600 or so) but worked. This RPM range is too high using small diameter carbide on harder materials. I need to get around 3-4K.

I would like to upgrade the spindle to a 65mm water cooled which allows the lower RPMs needed for metals like this. I believe the weight is around 10-12 lbs and will slide right in.

Before making this purchase, will this weight reduce the integrity of the bearing and travel bars?

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Just an update….everything is working perfect.  No issues!!!  Will see how long this lasts.



That's great!


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As long as you can reduce your feedrates a bit, it shouldn't be an issue. Biggest problem will be added backlash during acceleration to high travel speeds.

Best way to find out is place a 10 lb weight, or even a gallon of milk, on the empty gantry and run a script. You won't harm the ballscrews for sure. Worst thing you could do is cause some excessive wear on the linear bearings, but they are not at all expensive to replace, and a slightly shorter life shouldn't be much of a deterrent.

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Jacob will be eternally grateful.
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