New PM-728V-T Mill

[kiloseven]

Servo , stepper brakes that I have encountered are either physical shaft brake mechanism's or Electrical braking using heat sinks . I am no expert on this subject matter . I suggest serching for servo brake. I believe DMM servos and several other's offer built in braking via controller/servo combination.

 

[jimrk]

Think I'll cheap out on a brake option. Put a sign on the power off switch "Park the Head First"

 

[koenbro]

Think I'll cheap out on a brake option. Put a sign on the power off switch "Park the Head First"

My kind of solution.


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[kiloseven]

I don't have a problem with the z axis falling. Although I do remove all bits and lock the head before putting it to bed.

 

[jimrk]

mine might stay but it doesn't take much of a jar to get it to do a face plant if I forget to lock it.

 

[AlanB]

A counterweight would fix the Z from falling.

 

[AlanB]

Received email from PM that my CNC ballscrew conversion kit and 0-10V motor speed control module for the PM-728V-T have been shipped. Less than 30 pounds ship weight.

 

[currinh]

Ditto!

Hugh

Received email from PM that my CNC ballscrew conversion kit and 0-10V motor speed control module for the PM-728V-T have been shipped. Less than 30 pounds ship weight.

 

[mrosso]

Ditto!

Hugh

Same here. What do you guys think about the 16mm Z axis ball screw? Do you think it's sufficient for the Z axis load?

 

[AlanB]

Shipping stalled for awhile, but it is finally moving. Should see it early next week.

Hopefully they have selected properly. It has a 5 year warranty if I remember correctly.
This may be another reason to consider a counterweight setup.
Here's a THK guide on ball screw selection.

https://tech.thk.com/en/products/pdf/en_b15_069.pdf