Steps per Inch Question

[jtluttrell]

A quote from buildyourcnc.com:

"Generally, the precision will be reduced with the increase of the turns/inch. "

Is this accurate?

[Crevice Reamer]

Originally Posted by jtluttrell A quote from buildyourcnc.com: "Generally, the precision will be reduced with the increase of the turns/inch. " Is this accurate?

Hi JTL. Welcome to the Zone!

NO, quite the reverse.

200 steps x 10 microsteps x 5 TPI= 10,000 Steps Per Inch, which is a resolution of .0001.

The above with 10 TPI screw instead= 20,000 SPI, which is a resolution of .00005

http://crevicereamer.com/Page_2.html

CR.

[jtluttrell]

Whew! Thanks for the reply. After reading that article (at buildyourcnc.com), I had just about wrapped my head around the math when I read that quote. It threw me for a loop.

Thanks for the welcome.
I am new here, but hopefully I will be back again with many more questions as I start my build.

[Crevice Reamer]

Originally Posted by jtluttrell Whew! Thanks for the reply. After reading that article (at buildyourcnc.com), I had just about wrapped my head around the math when I read that quote. It threw me for a loop. Thanks for the welcome. I am new here, but hopefully I will be back again with many more questions as I start my build.

Read the link I gave you, it will help.

CR.

[ger21]

Originally Posted by jtluttrell A quote from buildyourcnc.com: "Generally, the precision will be reduced with the increase of the turns/inch. " Is this accurate?

The actual quote I found on his site is

If the pitch is too high, then resolution will be reduced

Which is correct. Either you mis-quoted him, or he has it written two different ways.

Increasing turns per inch reduces the pitch.

[phooddaniel]

Originally Posted by jtluttrell A quote from buildyourcnc.com: "Generally, the precision will be reduced with the increase of the turns/inch. " Is this accurate?

Yep, totally my bad. This is the reverse and I have made the correction on the website. I also should have said the "resolution" and not "precision". You will notice that in my contextual narrative and in the video, the point still comes across that the resolution does increase with the increase of the turns/inch, which is verified with the math on the site and video.

Thanks for noticing.

[jtluttrell]

Originally Posted by ger21 The actual quote I found on his site is Which is correct. Either you mis-quoted him, or he has it written two different ways. Increasing turns per inch reduces the pitch.

See the last paragraph at the very bottom of the page here:

http://buildyourcnc.com/leadscrews.aspx

And again, I just want to clear this up for the next guy. phooddaniel's sight is a great source of information. Keep up the good work.

[phooddaniel]

With the way that last paragraph is formed, I may have been describing number of starts (in my mind) and not turns/inch. If you have the same tpi, but the number of starts is increased, the precision is actually reduced.

Thanks for the kind remarks. I greatly appreciate it!