ndzied1
Lifetime Supporting Member
Here's one I can't seem to wrap my head totally around. I think what the customer is asking for is impossible but maybe someone has an answer.
I have a customer with the system shown below.
He already has purchased ballscrews with 5mm lead (i.e. One nut revolution moves the screw 5mm). Now he says he wants one step (or an integer number of steps) on the stepper motor controller to be equivalent to a move of 0.0001".
I can set up the Step Controller for any number of steps/revolution that is a multiple of 200 (up to 100000 steps / rev). I can play around a little with the pulleys given the standard number of pulley teeth for L series pulleys:
http://www.tbwoods.com/pdf/tim_sprk_blt.pdf
10 12 14 16 17 18 19 20 21 22 24 26 28 30 32 36 40 44 48 60
Then he tells me he's using an IDEC Micro-Smart for step generation which has a max frequency of 20kHz. This comes into play because he requires a speed of 1.5 in/sec. So, if he could get his exact 1 Step = .0001” he would need 15kHz for 1.5in/sec. This rules out using anything higher than 1 step / 0.0001” as even 2 steps / 0.0001” would require 30kHz.
They started w/ Pulley1=36T and Pulley2=12T for a 3:1 reduction. Running through the math gives:
1 nut turn = 5mm = 0.1969”
1 motor turn = 5mm/3 = 0.06562”
Setting the control for 600 steps/rev gives 1 step = 0.00010936” travel.
Again, I think the use of the 5mm lead screw makes what he wants impossible but maybe someone else here has some ideas….
I have a customer with the system shown below.
He already has purchased ballscrews with 5mm lead (i.e. One nut revolution moves the screw 5mm). Now he says he wants one step (or an integer number of steps) on the stepper motor controller to be equivalent to a move of 0.0001".
I can set up the Step Controller for any number of steps/revolution that is a multiple of 200 (up to 100000 steps / rev). I can play around a little with the pulleys given the standard number of pulley teeth for L series pulleys:
http://www.tbwoods.com/pdf/tim_sprk_blt.pdf
10 12 14 16 17 18 19 20 21 22 24 26 28 30 32 36 40 44 48 60
Then he tells me he's using an IDEC Micro-Smart for step generation which has a max frequency of 20kHz. This comes into play because he requires a speed of 1.5 in/sec. So, if he could get his exact 1 Step = .0001” he would need 15kHz for 1.5in/sec. This rules out using anything higher than 1 step / 0.0001” as even 2 steps / 0.0001” would require 30kHz.
They started w/ Pulley1=36T and Pulley2=12T for a 3:1 reduction. Running through the math gives:
1 nut turn = 5mm = 0.1969”
1 motor turn = 5mm/3 = 0.06562”
Setting the control for 600 steps/rev gives 1 step = 0.00010936” travel.
Again, I think the use of the 5mm lead screw makes what he wants impossible but maybe someone else here has some ideas….
