Messages

141

Show"N"Tell ( Your Machines) / Re: My Shizouka AN-S

« on: April 05, 2015, 02:03:58 PM »

Some photos of my Matchmaker can be found at https://www.flickr.com/photos/mc_mtb/sets/72157632396902054/
If you need anything specific, let me know, as I've finally got some spare time again. I would of replied sooner, but work levels have been far too high the past couple months.

It's still not finished, due to various reasons, but it may be up and running this year, as I've got a couple jobs where it would make life a lot easier.
The only thing I really need to buy now to get it up and running, are servos and assorted wiring bits. I've had a KFlop+Kanalog+Konnect for nearly a year now, just not got as far as putting it in the cabinet.

142

Show"N"Tell ( Your Machines) / Re: Conect 121 cnc retrofit

« on: February 20, 2015, 06:16:41 PM »

Have a question for you MC 

http://www.diycnc.co.uk/spindleV4.pdf

Would this spindle board be suitable to use with a KBIC controller?

Yes. It's all optoisolated with a built in DC/DC power supply, so it'll do the job nicely.

143

Show"N"Tell ( Your Machines) / Re: Conect 121 cnc retrofit

« on: February 16, 2015, 06:52:14 PM »

The little one is getting a bit warm at idle.  Can still handle it but I'm worried Iv done something wrong

Perfectly normal. As long as you can keep your hand on them for a few seconds, they'll be fine.

144

Show"N"Tell ( Your Machines) / Re: Conect 121 cnc retrofit

« on: February 10, 2015, 04:29:38 PM »

I think I found the datasheet via google. I've not got it saved in amongst my 121 lathe stuff, so you'll have to do your own searching. It's usually worth a quick google of anything written on the sensor, as datasheets for most things are online somewhere.

I can't comment on the thrust bearing setup, as IIRC that was one area where mine differed, but I think all the lathes used quite a crude thrust bearing setup.

If it's any help, all the photos of my lathe can be found at https://www.flickr.com/photos/mc_mtb/sets/72157625154378941/

145

Show"N"Tell ( Your Machines) / Re: Conect 121 cnc retrofit

« on: February 10, 2015, 07:40:51 AM »

From my archive -

Z-Axis
Motor
Label details
Astrosym L281
Volts – 3
Deg – 1.8
Amps – 1.7
Ohms – 1.8

15kg cm (1.47Nm) (Nema 34) (google suggests detent torque of 1kg cm)

Ballscrew
12x4

X-Axis
Motor
Label details
Astrosym L163
Volts – 5
Deg – 1.8
Amps – 1.0
Ohms – 5

69Ncm (0.69Nm) Nema23 (wired bi-polar)

Ballscrew
8x2.5mm

However mine was a newer version, and there were a few differences from what Hood had posted about his.

I managed to use the original spindle slot sensor, which was a Sharp 1A05, with the SmoothStepper I used.

Connecting the KB drive will depend more on your BOB. Provided the BOB has an isolated 0-10V output section, then it's fairly straightforward, you just have to make sure you feed the 0-10V with an isolated supply. DC-DC isolated converters are only a few pound, but some BOBs come with them already fitted (I'm sure PMDX does). The main thing to remember is the control voltage on KBIC style drives is at a floating voltage, so if you connect it directly to your electronics supply, something is going to release magic smoke, hence the requirement for things being isolated.

146

General Mach Discussion / Re: lack of power when using invertor ?

« on: January 19, 2015, 05:43:20 AM »

http://hsmadvisor.com/
I paid for a license a couple years ago when it was on offer, and it comes in very useful for getting pretty reliable numbers for new materials/cutters.

FSWizard is a free online version - http://zero-divide.net/?page=fswizard
I paid for HSMAdvisor as it means I can have it in the workshop without relying on a interent connection.

147

General Mach Discussion / Re: lack of power when using invertor ?

« on: January 18, 2015, 04:08:23 PM »

Geh, I know Fred mentioned gearbox, but it needs clarified.

As per this post

I think i found something

I obtained a rev counter and when the spindle is turning at 1200 rpm
the motor is only turning at 500 rpm.
 
If I crank up the speed using S1600 i get a message "set to max - to fast for the pulley?? ( or something similar)
Is there somewhere to tell it what the pulley ratio should be.
regards  
While i search the forum for pulley ratio

The spindle isn't turning at 1500rpm, it's turning a lot slower.
Which is why I'm asking how the VFD is controlled from Mach, and what ratio is involved.

As per Fred's question about cutting power, having just ran the figures through HSM Adviser, those figures suggest a cutting torque of 2.7Nm or 0.15kW at 1500rpm, so there is obviously something wrong, but we need information about the machine to find out why.

148

General Mach Discussion / Re: lack of power when using invertor ?

« on: January 18, 2015, 06:29:12 AM »

Geh, most CNC lathes are a fixed belt drive from motor to spinlde.

What we really need to achieve first before worrying about what mode the VFD is running, is to figure out why the commanded speed doesn't match the actual speed. For this we need to know how the VFD is being controlled by Mach, and if there is any pulley ratio between the motor and spindle.

Without those details, we could spend lots of time speculating about possible checks/settings and still be totally wrong, so until Fred provides more details, there's not much point discussing things.

149

General Mach Discussion / Re: what is the oldest post in this forum

« on: January 17, 2015, 10:27:51 AM »

http://www.machsupport.com/forum/index.php/topic,2.0.html is the earliest accesible topic.

150

General Mach Discussion / Re: lack of power when using invertor ?

« on: January 17, 2015, 10:25:21 AM »

TP, you've got your 2 and 4 poles mixed up. The more poles, the slower the motor turns.

How is your VFD controlled by Mach?