The New Machine

**Ricardoco** · 09-09-2011

Originally Posted by i2i

Denford used to do this on the early triacs, they stopped it quite quickly.

Hmmmm Your not the first to tell me that, i wonder if the bell is tolling for the counter balance idea!!!!

**i2i** · 09-09-2011

I expect the cutter needs the weight of the head to give it "balls"

**Ricardoco** · 09-09-2011

Originally Posted by i2i

I expect the cutter needs the weight of the head to give it "balls"

All of it!!!:surprised: thats just greedy.:heehee:

**fragger6662000** · 10-09-2011

you don't need to counter weight this machine if the correct steppers are used.

A setup with light stepper and poor z slide ways will cause crabbing and stalling. You counter weight to reduce the crabbing of the head. counter weighting does nothing to the cutting force as the slide ways and the screw resist this not the weight of the head. It does affect the acceleration as there is a greater amount of inertia.

**Ricardoco** · 10-09-2011

Originally Posted by fragger6662000

you don't need to counter weight this machine if the correct steppers are used.

A setup with light stepper and poor z slide ways will cause crabbing and stalling. You counter weight to reduce the crabbing of the head. counter weighting does nothing to the cutting force as the slide ways and the screw resist this not the weight of the head. It does affect the acceleration as there is a greater amount of inertia.

Cheers Fragger, I had seen a thread on another forum about the counterweight and threw the question out to see what everybody thought as the concept was one that i was not famillier to me , you are with the majority in thinking it is not required or even desired, In an Ideal world what stepper would you suggest ive got a 34.

Rick..

**fragger6662000** · 10-09-2011

i used the keling kit with 900ozin on Z and 381 on the XY.

The X is rated at 900oz but the drive is only delivering 3.5 amps so i think it is 500oz.

Have you go the motors and and drives because i would recomend the kelinginc kit as the motor are low impedance and give the best performance. UK motors seams to have a lot higher impedence and poorer performance.

**fragger6662000** · 10-09-2011

http://www.kelinginc.net/CNCNEMA23G540Package.html

sorry the z was 34 and xy 23

**Jonathan** · 10-09-2011

Originally Posted by fragger6662000

i would recomend the kelinginc kit as the motor are low impedance and give the best performance. UK motors seams to have a lot higher impedence and poorer performance.

Surprising that you imply all UK motors have a high inductance. It clearly depends which you get and where. Can you link to a datasheet for the ones you have so we can compare?

Edit, actually ignore that - found it:

http://www.kelinginc.net/KL34H295-43-8B.pdf

To be fair that's quite a low inductance for that size motor. Still with a Nema 34 motor you really should be running it on a LOT more than 50 volts.