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Posted on CNC question

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Mike

406 posts in 2593 days


#1 posted 08-09-2013 04:34 AM

Hi Brutal,

CNC machine resolution depends on two main things. First is the servo / stepper increments and the second is the guide screws / threaded rods. If you have a servo that can step in say 1/4” per rotation versus a servo on the same guide rod that is 1/32” per rotation; the second will provide a better resolution. Now with the treaded rod, the more threads per inch can increase resolution too. The more threads per inch will also reduce back lash. Back lash occurs when the direction on a threaded rod is changed. It is the distance between the opposite sides of the tread engaging. CNC machines in my personal experience can go down to easily 0.0005” but they run well over $75,000. For a CNC router entry level pre-built machine you can start out at around $2,000 – $4,000 that can hold about 0.005” or so.

You also might want to research the difference between a stepper motor and a servo motor to see which system might work best for you since each has different advantages and disadvantages.

As you can imaging you need to really look into what you want as your resolution / control to determine your best path to go.

I hope this helped a little.

MIke

-- look Ma! I still got all eleven of my fingers! - http://www.lepelstatcrafts.etsy.com - https://www.youtube.com/channel/UCppWfrYGXCr5lm9uW-Fpqqw


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