[taigfraeser]

hi,
guess I need some help with my mach3 motor tuning settings. I have s taig with one of the old custom deepgroove1 controllers. Think it does 8 microsteps and Im running it in mm, so whatt settings do I need?
thanks & cheers

[awerby]

Even tell you that much?

hi,
guess I need some help with my mach3 motor tuning settings. I have s taig with one of the old custom deepgroove1 controllers. Think it does 8 microsteps and Im running it in mm, so whatt settings do I need?
thanks & cheers

[The math's pretty simple: the motors have 200 full steps per revolution, the screws have 20 threads per inch. So it's 200 times 20 times 8 to get the number of microsteps per inch (32000). To get the number of microsteps per mm, divide by 25.4 which gives you 1259.8425.

Start out with fairly low velocity and accelleration settings, and adjust it until you get smooth action at the highest speed before it starts hesitating or sounding bad (use the up-down arrow keys to move the motors in the tuning dialogue.) Then derate it about 20% as a safety margin. I hope that helps - I've heard nothing but complaints about those controllers...]

Andrew Werby
www.computersculpture.com

[taigfraeser]

thanks- yep it does sound pretty simple, and what about the sherline rotary? The motor is the same,, but I guess its not 20 tpi there?

[awerby]

The Sherline rotary table takes 72 turns or the crank per complete revolution; otherwise the arithmetic is the same: 200 x 8 x 72 = 115,200. Divide by 25.4 and it comes to 4,535.4331.

Andrew Werby
www.computersculpture.com

thanks- yep it does sound pretty simple, and what about the sherline rotary? The motor is the same,, but I guess its not 20 tpi there?

[mactec54]

awerby

To go from inch to metric you have to multiply (X) by 25.4, If you want mm to inch then you divide, So 32000 micro steps per inch x 25.4=812,800

[ger21]

Andrew is correct. You want steps/mm, not mm/inch.

[mactec54]

ger21

I would like to know how that works, if you have 32000 microsteps per inch & you want to change that to mm then you have to multiply by 25.4 to get mm

[ger21]

Say you have 50.8 microsteps per inch, how many do you have per mm?

2

You divide by 25.4 to get steps per mm. You multiply to get mm per inch

You want to know how many microsteps for one mm, which is 1/25.4 of an inch.

[mactec54]

ger21

Thanks,

The way I saw it if you have 2in you have to mulitply by 25.4=50.8mm if you have 50.8mm you divide x25.4=2in

[ger21]

ger21

Thanks,

The way I saw it if you have 2in you have to mulitply by 25.4=50.8mm if you have 50.8mm you divide x25.4=2in

That's how you convert inches to mm and mm to inches, but that's not what he's doing.