Increased ipm

[ecope]

Hi all,

My Taig CNC mill will max out about 30 ipm. I was wondering what would have to be done to get it going faster?

1. Is the machine construction itself making it limited?
2. Would you have to put larger motors on?
3. Is the controller limited?
4. Offset the existing motors and use a belt with different size pulleys to make it faster?

What is the answer and thanks for the reply!

Eric

[Torchhead]

Hi all,

My Taig CNC mill will max out about 30 ipm. I was wondering what would have to be done to get it going faster?

1. Is the machine construction itself making it limited?
2. Would you have to put larger motors on?
3. Is the controller limited?
4. Offset the existing motors and use a belt with different size pulleys to make it faster?

What is the answer and thanks for the reply!

Eric

Probably all of the above.

The RPM max of steppers is determined by

1. Torque RPM curve. You can't go faster than you have torque to do so. That is the only place bigger motors would help.

2. RPM increases with DC voltage. A lot of small controllers use low voltage drivers (24 to 30 vdc). That limites the motor RPM to about 60% of it's capability.

3. Frictional forces in the machine will cause smaller motors to stall sooner (see #1 above)

4. Steppers have an upper RPM limit even if everything is perfect (voltage, size, pulse stream, etc) while it varies motors run at the recommended 10 to 20 times their rated label voltage can reach about 800 RPM.

5. Fine leadscrews on the smaller mills mean you have to spin things a lot faster. At 20 TPI even 800 RPM becomes 40IPM max.

6. Only way to gain speed if you have good voltage and adequate motors, is to change the leadscrew to one with a courser pitch or use belt increase to spin them faster.

so most of it is just plain physics and limitations of steppers, controllers and power sources.

TOM CAUDLE
www.CandCNC.com
Totally Modular CNC Electronics

[TOTALLYRC]

Hi all,

My Taig CNC mill will max out about 30 ipm. I was wondering what would have to be done to get it going faster?

1. Is the machine construction itself making it limited?
2. Would you have to put larger motors on?
3. Is the controller limited?
4. Offset the existing motors and use a belt with different size pulleys to make it faster?

What is the answer and thanks for the reply!

Eric

From other posts that I have read and my own experience, here are a few answers.

1. Limit the rapids to about 60 ipm unless you really need to go that fast for cutting otherwise you will probably get accelerated wear.

2. Depends on which motors are curently in place. Larger motors tend to go slower, but it all depends on what you have.

3.Depends on wich controller you currently have. A better controller such as the Gecko540 will make the machine run better because of the midrange compensation.

4.Upgrading the controller is probably easier than pullies and belts.