Messages

911

General Mach Discussion / Re: Newbie I mean really Newbie

« on: November 09, 2016, 02:16:08 AM »

A 'tube search of "Mach3 Lathe" should bring some up, I did have a couple bookmarked somewhere......

912

General Mach Discussion / Re: Mdi is not a MODE

« on: November 09, 2016, 02:14:53 AM »

 Only a jury can decide if I lie alone.

Thats relatively easy to see - the system was modified, any injury or damage will be down to the modifier unless it can be proved that the injury/damage has absolutely no connection to the mods - in this case the modifier would lose as steps were not taken for interlocks etc.

This is one of the reasons it is so hard to make and sell machines in a one-off basis, it's a minefield of lawsuits.

913

General Mach Discussion / Re: About V.B. script

« on: November 08, 2016, 01:56:37 PM »

Most pc's beep when they boot up - does it do this?

If not maybe your speaker is dead or the connector has popped off the board.

914

General Mach Discussion / Re: Spindle (AC Servo vs VFD)

« on: November 08, 2016, 08:19:25 AM »

Glad to help

The Cs-Labs stuff is top-notch, their help is also as good.

I have 700W on X & Y, 400W on Z but could have been smaller still i think - the ball screw gives a massive increase in torque.

915

General Mach Discussion / Re: About V.B. script

« on: November 08, 2016, 06:02:00 AM »

Not sure about the beep but i think you can make it play a .WAV audio file.

916

General Mach Discussion / Re: Spindle (AC Servo vs VFD)

« on: November 08, 2016, 04:47:29 AM »

LOL

Heres the encoder...
http://www.zappautomation.co.uk/electrical-products/encoders-36/isc3806-001g-1024bz1-5l-1000-line-optical-encoder.html

the feedback only goes to the CSMIO - its only used for rigid tapping as i haven't managed to successfully close the speed PID loop yet but i am not sure if i need it really - the VFD is in sensorless vector mode and auto tuned to the motor and seems to regulate speed pretty well on its own.

The controller is CSMIO-IP/A plus ENC module and MPG module, a fantastic controller, really easy to work with.

The VFD...
https://inverterdrive.com/group/AC-Inverter-Drives-230V/Bosch-Rexroth-EFC5610-2K20-1P2-MDA-7P/

917

CS-Lab / Re: IP-A and Servo drives, voltage matching...

« on: November 07, 2016, 04:19:30 PM »

The motor cables are pre-wired to sockets/plugs so pretty much impossible to get wrong

The encoder signals from the drive to the IP-A would also give fault is wired wrong.

It all seems to work right, just with a bit of a following error, the best tune i could get was to tune for lowest following error in sequence - P, I, D, Vff they seem pretty stiff and stop sharp except for the Z drive which has a smaller motor and is still like jelly - you can move the pulley by hand a fair bit and it will pull back whereas the X & Y are locked solid.

918

General Mach Discussion / Re: Spindle (AC Servo vs VFD)

« on: November 07, 2016, 08:24:36 AM »

All is in here, pull up a chair, its a long read

http://www.machsupport.com/forum/index.php/topic,32513.0.html

The encoder came from Zapp Automation, it does not connect to the VFD but to my controller, that is why i mentioned CS_Labs, the one i have is the CSMIO-IP/A with ENC module and MPG module add-ons. The encoder is not used for closed loop control - its used by the controller for rigid tapping.

The 3Hp is needed to get the torque down in the low speeds, the mechanical drive did a good job with this but as thats gone the torque is replaced by using a big motor, the 3Hp one had insane power at all speeds so was a pretty close match, its no bigger than the 1.5Hp I pulled off and sold on eBay

No idea about the lathe, sorry.

919

General Mach Discussion / Re: Spindle (AC Servo vs VFD)

« on: November 07, 2016, 06:58:54 AM »

I have just finished this exact job on a Bridgeport

I asked the same questions re servo or induction drive.

The overwhelming response and what i went with in the end is to fit a 3Hp induction motor, VFD and if using a CS-Labs controller like mine, throw in an encoder too.

This little setup gives me Mach3 speed control from 300 to 3000 rpm without using gears, rigid taping, and its much quite than the old vari-speed mechanical system that it replaced.

The thing with a servo is that it needs to be big to get proper torque and power input, big is easy but big AND fast is not  - they are £££££ and for little benefit as the BP has not got much chance of having an ATC so no need for spindle indexing.

Rigid tapping made it worth doing on its own

If yours is the normal BR2J head machine, I have a file for the adaptor plate if you want it that mounts a standard frame 3Hp face-mount motor. I used a Bosch VFD and braking resistor although I only have it stop in 3s as instant stop is a big strain on the old girl.

Belt was 30mm HTD 8 and pulleys were 1:1 ratio.

920

CS-Lab / Re: IP-A and Servo drives, voltage matching...

« on: November 07, 2016, 02:21:49 AM »

Hi

this is a retrofit/conversion of a manual mill to cnc.

Yes i do have a 'scope but would not know how to do those tests, the encoders are 10,000 all edges, 2,500 count. I would feel certain that they are working correctly or else it would run away / fault out ?

They do run at 3000rpm for 10v input so that sounds ok?

Its just the amp pID loop that I can't tune due to the chinglish, as well as lack of knowledge.