Messages

41

General Mach Discussion / Re: Transformer DIY qquestions

« on: August 09, 2014, 02:13:24 AM »

This transformer power the A axis of my knee mill cnc conversion:
http://vimeo.com/102987002

42

General Mach Discussion / Re: Transformer DIY qquestions

« on: August 08, 2014, 10:58:00 PM »

I measured the 12 12 leads today again and it is normal now, 24V without rectifier.
After connecting 12 12 leads to the rectifier, then to 10000uf 100v cap, I get 34.2V DC, ok...I do not mind 34.2v, as the Stepper driver can take up to 60VDC, but why is it 34.2vdc?

43

General Mach Discussion / Re: Transformer DIY qquestions

« on: August 08, 2014, 03:24:21 AM »

I have complete set transformer, 220 VAC, 45.2V, the capacitor is 10000uf 100V and 1 spare 110VAC 12-0-12 50W coil , new. I swap the coil around. Applied 110VAC, then measure the 12 12 leads with voltmeter I get 10v, shoudn't it be 24 or more?. the 12 and 0 leads give 12v, this is ok. the 12-12 leads were not connected to rectifier yet.

44

General Mach Discussion / Re: Transformer DIY qquestions

« on: August 07, 2014, 12:08:01 PM »

Thanks Tweaky CnC,
                            

What's the value for current "I"?
C = (80,000 x I)/24
Should have kept the label/tag, will find out what wattage of the coil.

45

General Mach Discussion / Transformer DIY qquestions

« on: August 07, 2014, 12:40:38 AM »

Hello all,
          I'm about to build a AC/Dc transformer 110VAC to 24VDC.
I have a toroidal coil and 1 bridge rectifier KBPC3506 (35A), my questions are:
1. the coil stated 50HZ, Pri: 0-220V/Red-Red, Sec: 12-0-12v/blue-white-blue, the mains are 60Hz here in Tw would it be ok to use this Toroidal coil?
2. How do I tell the power (wattage) for this coil?
3. what capacitance should I use?

thanks,

46

General Mach Discussion / Re: Power Supply box

« on: July 18, 2014, 12:20:03 AM »

Great!

47

General Mach Discussion / Re: Power Supply box

« on: July 17, 2014, 08:40:11 PM »

found this on ebay, is this one ok:
http://www.ebay.co.uk/itm/EATON-WMZT1D03-CIRCUIT-BREAKER-3A-10kA-Type-D-SP-UL489-BT-/380899703532?pt=BI_Circuit_Breakers_Transformers&hash=item58af643aec

48

General Mach Discussion / Re: Power Supply box

« on: July 17, 2014, 11:44:52 AM »

 Thanks Scott.
Antek output 36VDC, 12VDC and 5VDC, so Class D breaker goes between the PSU and the DC servo drive motor V+, correct?


thanks

49

General Mach Discussion / Power Supply box

« on: July 16, 2014, 01:02:27 AM »

Hi,
    I'm building the cnc controller drives and adding an Antek power supply PS-5N38R5R12 for my Knee Mill cnc, need some suggestions what to add after the Antek PSU to prevent toasting the DC servo drives?


Saw this in cnczone:
http://www.cnczone.com/forums/vertical-mill-lathe-project-log/79207-bostomatic-controls-retrofit.html

what is that device below the Antek PSU? is it a relay? or breaker?

50

General Mach Discussion / Re: Knee Mill Conversion

« on: July 01, 2014, 09:41:27 AM »

Ok, thanks.