Messages

51

General Mach Discussion / Re: Spindle drive specification

« on: March 18, 2011, 07:54:12 AM »

Hi Hood

photos not particularly clear so also added word document with what I think they say.

what do you think would be the best way to handle integrated cooling motor as I need 1 ph supply.

!) change motor to 1 ph

2) Can parker contolller control this as well? (may be stupid question)

3) get separate controller for this?

and how do you think it should be controlled ie

1) temperature

2) always on when lathe switched on

3) always on when spindle motor running

4) other

cheers George

ps will try internet search to see if I can get any more  info motor

52

General Mach Discussion / Re: Spindle drive specification

« on: March 17, 2011, 09:13:30 AM »

Here is motor manual (not as big as I thought)

Siemans dc motor GL5104 NLF6     ( GL5104-OEZ40-6JU7-Z)

53

General Mach Discussion / Re: Spindle drive specification

« on: March 17, 2011, 08:51:19 AM »

here is the two other photos

54

General Mach Discussion / Re: Spindle drive specification

« on: March 17, 2011, 08:40:47 AM »

here is the link for the parker controller recommended. The existing drive is I believe of emcos own design and integrated into the control panel ( 20 years old and not supported now)

http://www.inverterdrive.com/group/DC-Thyristor-Drives/SSD-514-8A-Eurotherm-Shackleton-Rapier-Drives-540-/default.aspx

just in case not clear from photo encoder belt driven below main spindle

55

General Mach Discussion / Re: Spindle drive specification

« on: March 17, 2011, 08:15:59 AM »

Hi Hood

sorry having a few problems trying to get photos loaded. will try again now.

I don't think it is a servo (but not sure) as encoder (item 54 in photo) totally separate

I do have electronic manual for motor but may have to take copies of some of relevant pages

as I think it is very big file to upload. I will wait to see what you think after viewing photos.

56

General Mach Discussion / Spindle drive specification

« on: March 16, 2011, 09:56:24 AM »

I have an Emcoturn 120 3 ph cnc lathe am I am looking to convert to 1 ph  Mach3. To make the project more manageable it is my intention to split the overall project into smaller lumps, so for the moment I am concentrating on the Spindle drive.

My electrical knowledge is very limited so any help from the forum would be greatly appreciated particularly at this early stage to stop me going off in the wrong direction.

Existing spindle setup

The current spindle drive is a 2.6kw DC Siemens motor (GL5104-OEZ40-6JU7-Z)
with integrated  3ph cooling fan. Direct belt driven (see photos) output speed 150 -4000 rpm max torque 17.6 NM and belt driven encoder (approx 300 slots)











I have noticed on the forum that a Parker ssd 514c unit would control this motor but I had a look at the manual and it didn’t look particularly straightforward also not sure how I would tackle cooling fan. Also not sure if this motor to powerful and costly to run for hobby needs.

Question 1 Do you think it is worth persevering with this motor ?

I was thinking of saving money by going for a smaller motor say 1.5 kw with ac inverter

Question 2  Is this a false economy ? ( I want to cut threads and not sure about torque level at slower speeds)

2,4,6 pole motors !!! I am not sure what would be better for my application relating to torque, running cost and surface finish

Question 3 For average working speed say 1500 rpm.  Is it better to get a faster motor slowed down by inverter drive or slower motor speeded up by inverter?

I have noticed a massive price difference for ac inverters of the same power rating
as much as 300% the more expensive quoting vector control

Question 4 For my application is this extra cost justified? Does this just give more accurate speed control or are there any torque/ heat implications particularly at lower speed?

I have been looking at various breakout boards on the internet to see how the spindle controls are hooked up and many show inverter connections going straight back to BOB. But I have also seen speed controllers advertised and connected up to similar ac inverter drives.  Eg

http://www.cnc4pc.com/Store/osc/product_info.php?cPath=25&products_id=303

Question 5 What are the benefits of these controllers?

The lathe comes with its (very well made) own spindle encoder (see photo) approx 300 slots

Question 6 Is this too many slots for mach3 to handle and does single slot produce accurate threads?

Not sure what voltage output is for this encoder or of wiring details.

Question 7.  Do you think I should change this for new or can anyone help with info?


Any comments from the forum would be greatly appreciated. Even if you only have answer for one of the questions. It all helps

Cheers George

57

General Mach Discussion / Re: Hot Stepper Motor

« on: November 12, 2008, 09:02:11 AM »

Sorry about the delay (several months) in responding with the

results of trials but other work commitments kept me away.

Anyway have just fitted 270 kohms resistors to XYZ geckos (6 amp motors)

and a 27 Kohm resistor to the 4th axis geckodrive (as suggested) with great results.

Particularly the 4th axis which was giving me the problem is now still cool to the touch

when working.

Many thanks Sam/Jim for all your help and I hope this answer is of use to others.

Cheers George

58

General Mach Discussion / Re: Hot Stepper Motor

« on: July 06, 2008, 09:01:07 AM »

Hi Jim

Sorry about delay in responding but computer has been out

of action for best part of a week.

Anyway I have sent off an email for a definative answer

for both my motor types from GECKO and I will

let you know the results. Watch this space.

Cheers George

59

General Mach Discussion / Re: Hot Stepper Motor

« on: June 30, 2008, 01:30:36 PM »

Hi Sam
You have got me worried, just checked again, definately no resistors on existing setup as supplied by Wabeco.
(Don't know if it makes a difference but the motors supplied by wabeco are 4 wire)
Have never noticed othere motors or drivers getting hot as they are either behind fixed covers or inside the panel.
But it's also fair to say they have never done any very long program runs probably 1hr 30mins max
Cheers George

60

General Mach Discussion / Re: Hot Stepper Motor

« on: June 30, 2008, 08:04:34 AM »

Hi Jim

System designed by Wabeco using 6 amp motors (38v) and all 4 drives have no current set resistor.

As described I am looking to add a 2.5 amp motor for the 4th axis

Looking at the Gecko manual the formulae for calculating this resistor value is

R = 47 *  I  / ( 7 - I )

The motor say current is 2.5 amp / phase

As this motor is wired in parallel what  ' I '  value should I use ?

Cheers George