DIY ATC Spindle

[Husky1]

Here is the section view of the bt30 spindle setup. All the parts for spindle are made or ordered. Unfortunatelly i didnt think about diy spindle when i was designing the cnc machine, so now i am facing lack of space on z axis.



Sole purpose of the motor would be to run the spindle shaft.

[Husky1]

btw, if anyone is interested, i could make another shaft. (shaft, pull bar and lock socket)

[magicniner]

You need to look at proper spindles and use a stack of conical spring washers to retain the tool via pull studs and a readily available, off the shelf puller (petal/clamp/claw are useful search terms)
You don't have space in that design for a good pull system.

[Husky1]

I dissagre. This system works perfectly. There is a stack of 42 belleville washers in the shaft, with enough force to hold the tool with six 5mm bearing balls. I will demonstrate when the spindle is build in a month or so.

[magicniner]

Yes, it will have the tension, initially.
But there is a reason the spring stack is much larger in commercial spindles, they don't rely on what works, they rely on what doesn't fail prematurely in service.

[Husky1]

that might be true, but even if the springs fail, it is much much cheaper to repair the damage than buying 3k+ spindle. At the end of the day, this is still home made cnc, not proffesional cnc so i hope it will do the job.

[magicniner]

10krpm spindles are closer to 1k.
All you'd need to do is use a larger tube & bearings to accommodate adequate components, why would you not?