CNC Mill Conversion Questions.

[rdean]

An RF45 and a RF31.
Ray

 

[Eddyde]

750 Watts or maybe a bit less would be about right for brushed DC and BLDC motors, as is 1200 oz in for steppers. I think the brushed DC servos on my mill are about 500 oz in. I'm running the motors at 80 volts rather than the original 100 volts, and the maximum measured output to the motors 30 volts at 100 IPM. I did this because the stepper runs on a 80 volt power supply, and I wanted to just use one power supply. The Z axis is a 1200 oz in stepper and I cut the torque back on that to about 1/2 power. Normally you are running the motors at a fraction of their rated power, so theoretically you could get away with less power.

Hi Jim,

Im going with the brushed DC servos on all three axis, I just need to settle on the size, I was considering this one:

KL34-180-72 (NEMA 34) Dual Shaft, Front Shaft 1/2" Rear shaft 1/4":
1125 oz-in Peak 72V/40A
Green is Ground, Red is +, Black is Common)
Constant Torque: 226 oz-in
Peak Torque: 1125 oz-in
No load Speed: 4000 R.P.M
Terminal Voltage : 72 VDC
Continuous Current: 7.8 A
Peak Current: 40 A
Weight : 4.25 Kg
Skewed Rotor Design

I think it will be more than enough, just want to be sure.

Also, I have the computer up and running so I would like to take you up on your generous offer of your software. Please let me know how I can get a copy, I would greatly appreciate it.

Thanks

Eddy

 

[JimDawson]

Hi Eddy

I sent a PM (now called a conversation I guess) with the link to my software installer. If you don't get it, let me know and we'll try plan B

I think the motor will work just fine. Looks like plenty of power.
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[gt40]

I looked up my conversion for my PM45M mill(rf45 clone)

Fixed costs not counting a rf45 type mill breaking down as follows:

$1300 for 950 watt 3 axis dmm tech ac servo kit: http://dmm-tech.com/Files/DMMTechnol...ue_Rev.1.1.pdf

$100 to $200 for 1 shot oiler: http://cnccookbook.com/CCMilllOneShot.htm

$450-$600 for 3 ball screws + ball nuts = c7 class (you can also spend 10k per axis on this one) decent site on someone doing a conversion:http://www.graetech.com/index_files/Page1897.htm

$100 for belts, pulleys from spi- si: http://www.sdp-si.com/eStore/CoverPg...Components.htm + good additional info: http://cnccookbook.com/CCMillCNCServos.html

$50-$100 for material costs for brackets to mount the servos

mach 3= $175 http://www.machsupport.com/purchase.php

$25-$ 100 PC case for servo control box

$100- $200 PC running xp, vista or window 7 http://www.tigerdirect.com/applicati...Price%3BPrice4

I would really look at just going with servos. I have used the 750 watt DMM servos on the mill and 400 watt on the Jet 13x40 lathe. the 750 watt ones move the 400 lb head assembly with authority (2 to 1 gear ratio) and they have real support. They spent literally hours on the phone setting up Mach3 with me before I knew anything. In hind sight, it is really plug in play

Here is the full build log of my mill conversion if it is any help:

http://www.cnczone.com/forums/vertical-mill-lathe-project-log/149951-cnc.html

 

[Eddyde]

So far I have spent:
$275. Galil DNC 2240 Motion Controller.
$325. for 4 Galil 12-80 Servo Amplifiers (Drivers).
$850. for 3 servo motors with rotary encoders and 1 power supply.
$150. for Dell Computer with keyboard, mouse & Windows XP
$150 for Galil ICM-2900 Opto-Isolated Interconnect Module with 100 pin cable.
About $100 on miscellaneous stuff.
Things I had on hand:
20" LCD Monitor.
Gutted Mac G5 computer for the electronics package enclosure.

 

[boodogboo]

I have about the same questions. I have a smithy 1324 max I was considering doing a CNN on just the lathe anyone have rough cost to complete the project and who and where to get the parts to do it. I know nothing I guess here would be first place to start.