Newbie- CNC Rebiuld

[adbradley]

I took out the drive boards and the rack tonight. I am still having problems finding that 70v DC supply though. Any more helps would be great

[mikemill]

Adam

Here are a couple of pics of my conversion, board pic left to right, shows the two large capacitors, toridial (round) transformer on top of transformer diode rectifiers, next two in line 5amp fuses, then breakout board with printer cable,
next two Geko drivers and fan( I don't think you need fan as my drivers stay cool), then 12v dc p/s. Other pic of lathe I replaced front panel, shows on/of switch, E stop, keyboard, coolant flow contol. Hope this helps, one question do you have any experiance handling electronics if answer NO then Adam please DO NOT go any further, as you could elecricute yourself, and/ or damage expencive parts, find someone with experiance to do conversion.

Regards

Mike

[adbradley]

Thanx for the pics Mike, this helps a lot, i do have electronics experiance, I was just confused by the fact that the digiplan drivers (original Orac) were getting there power from an AC source, not DC, i was exspecting them to be like the normal drivers used today that just used a straigt DC supply. Plus it didnt help that the wiring diagrams that i have for the Orac are old scans that are not real clear. Plus its always better to get good information from someone that has already done this.

Thanx again for the pics mike, and if you have any more of the boards, please send them to me at adam@nicohobbies.com

Thanx
Adam

[adbradley]

Mike,

Are the capacitors and rectifiers from the original power supply? I got mine out last night and it doesnt have 2 rectifiers, only one.

Adam

[mikemill]

Adam

Yes my machine has two rectifiers, and are origional parts, but it doesn't rearly matter as long as you have the right voltage DC

Mike

[adbradley]

Here are pics of my power supply and spindle driver.. It doesnt look like yours at all :/

[mikemill]

Adam
I think the differance is due to country voltage yours being 120V and ours 240V, so Denford designed p/s for US market, try traceing output from transformer with meter set to AC it you get a reading were neadle defects wrong way its problely DC,then swich meter to DC and check, if no joy Denford have a forum on thier website I suggest you pose question and pics to them.

Mike

[johncarpenter]

Adam,

How is your ORAC conversion going? I have the exact same electronics that you have, based on your pictures. Mike says that the steppers were 70 volts DC but as far as I can tell my ORAC has SD3 drives that use 18 and 28 Volts AC from the transformer. That why the pictures of yours and his power supplies were different. Is this true? If the AC voltage is really no more than 26 volts then the DC would be only 37 volts. That would let me use a Gecko 540 drive for my conversion. I am a complete newbie to all of this and I am struggling a bit.

John C.

[mikemill]

If you are unsure of voltage to drivers, an email to the Denford forum should get to answer.

Cheers

Mike