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Fivetide
08-06-2018, 01:51 PM
Retro fit core drill for motorised z axis, suggestions.

I have a new project and I want to cut some cores out of stone so I'm thinking of getting a, not so expensive bench core drill, and retro fitting the z axis so I can be cutting the cores slowly but efficiently and doing other things at the same time.

I'm thinking a pulley and motor may slip .. unless say I use a toothed car cam wheel type setup ? Direct stepper motor may be a bit to large to produce the torque ? Not sure I'm no expert :)

Example pic

24361

its basically a very small version of this below which i think is really cool lol :)


https://www.youtube.com/watch?v=QzfjJY1mppA

magicniner
08-06-2018, 07:42 PM
Do you need fixed feed speed or fixed cutting pressure?

Fivetide
08-06-2018, 07:57 PM
Do you need fixed feed speed or fixed cutting pressure?

I was thinking fixed cutting pressure , cutting speed would depend on material and also help tool life I think.. not sure lol

I had thought of putting a wide pulley on and fixed weight on a chain, seen this done for other things

magicniner
08-06-2018, 11:44 PM
I had thought of putting a wide pulley on and fixed weight on a chain,

My thoughts too, if fixed force.
For fixed speed a stepper, stepper driver, variable frequency pulse generator and toothed pulleys & belts.

Fivetide
08-06-2018, 11:46 PM
My thoughts too, if fixed force.
For fixed speed a stepper, stepper driver, variable frequency pulse generator and toothed pulleys & belts.

Yes agreed.. I think ill try that.. keep it simple rule. Thanks magicniner