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### Author Topic: Deeper into the 4th A Axis  (Read 6122 times)

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#### docltf

• 353
##### Re: Deeper into the 4th A Axis
« Reply #10 on: December 30, 2008, 04:47:42 PM »
Dave

if you got the sherline p/n 3700,it has a gear of 72-1 then the steps you did are right ,400 per degree. set A axis angular. clamp the flat stock to the axis not the table. look at your PDF. use mach3 to
control the axis back and forth.

bill

#### simpson36

• 1,374
##### Re: Deeper into the 4th A Axis
« Reply #11 on: December 30, 2008, 04:55:59 PM »
If it helps, I gave up trying to calculate the steps per degree for my 4th axis. Nothing about the A axis was intuitive to me like the linear axis were, and anything I actually calulated was way off.

Ultimately, I just used the degree wheel and interated down till I got one degree of movement for one degree commanded.

So I would suggest you just command 45 degees and see what the result is and go biger or small on the count until you get close. At that point the number of steps per degree you are using will be some identifiable muliple of what you have step and gearing wise and you should be able at that point to get the exact number you want.

#### vmax549

##### Re: Deeper into the 4th A Axis
« Reply #12 on: December 30, 2008, 05:41:48 PM »
steps pr rev on motor X microstepps  X gear ratio /360 = Step per degree

200X10 = 2000
2000X72=144000
144000/360 =400 steps per deg
or 1 step = .0025 deg

(;-) TP

#### budman68

• 2,360
##### Re: Deeper into the 4th A Axis
« Reply #13 on: December 30, 2008, 05:57:29 PM »

Dave
----------------------------------------------------------------------
Just because I'm a Global Moderator, don't assume that I know anything !

Dave->

#### docltf

• 353
##### Re: Deeper into the 4th A Axis
« Reply #14 on: December 30, 2008, 05:58:22 PM »
simpson36

why did you give up? there are plenty of people here that will be glad to help. just post your A axis specs. type of motor,how you drive it,all the gear reduction stuff and should it be
angular or linear.

bill

#### simpson36

• 1,374
##### Re: Deeper into the 4th A Axis
« Reply #15 on: December 31, 2008, 09:47:18 AM »

docltf;

Being a total novice at this, I really had no idea that Mach was asking for.

As for the forum, I must say that this forum, unlike many, is very helpful and focused on the topics and not on flaming and personalities. A refreshing change from some.

Once I just went with observation instead of calculation, it only took a couple minutes to figure out what Mach wanted. It would have taken much longer to collect and post all of the specs and wait for an answer.

My 4th axis is actually just a stepper powered spin index, so it already had a degree wheel on it. I posted pics in the 'show and tell' section.