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### Author Topic: 1605 Ball Screw settings  (Read 11516 times)

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#### ajl53

• 15
##### 1605 Ball Screw settings
« on: January 27, 2013, 08:28:44 PM »
Hello All,
I replaced a 1 motor chain drive on the x-axis with 1605 ball screws on each side of the gantry. Mach is set up in inches so I did the math and came up with 2013.597 steps
on the x and A(slave) motors. I think I did the math right starting with a 5mm pitch on the screws. My problem is that when I tell Mach to move 5 inches in the x , it
measures short. In order to solve the problem I increased the steps to 2050.
My question is if this is a viable way to correct the error or is there something else I should be doing?
I also set the velocity to 30 and the acceleration to 2 which seems to be accurate with a stop watch.
My problem with the velocity is now none of the axis controls react to the "shift" key and "arrow' key to go "faster".
Thank you for any guidance.
Art

425 oz motors
200 steps/rev
driver set to 1:2

#### CNC-AL

• 27
##### Re: 1605 Ball Screw settings
« Reply #1 on: January 28, 2013, 04:42:56 AM »
Hi,

Give 2032 a try.

I work it out like this.

25.4mm (1 inch) divide 5mm pitch = 5.08

so that means you need 5.08 revolutions to move 1 inch

now multiply 5.08 by 200 steps per rev =1016

as your driver is set to 1:2 then multiply 1016 by 2 =2032

so you should set to 2032 steps per inch.

I think that's right.

Cheers Allan

#### vondeliusc

• 9
• Rocket Science Я Us
##### Re: 1605 Ball Screw settings
« Reply #2 on: February 10, 2019, 04:56:24 PM »
The jog function in Mach3 defaults to the slow jog rate set in the MPG mode (tab key).
Set the 'Slow Jog Rate' which is probably at the default 100%,
to 5 or 10% and then when you hit the arrow or other jog keys it will move at that 5% rate normally,
unless you override by holding down the shift key.
For general knowledge.
« Last Edit: February 10, 2019, 04:59:33 PM by vondeliusc »