Messages

851

General Mach Discussion / Re: Wiring Limit & Home Switch

« on: January 19, 2011, 07:47:49 AM »

Often one switch is all that is needed on an axis as it can be triggered at either end of the travel, just depends on your setup.
Hood

Good point Hood and I will follow it

852

General Mach Discussion / Re: Power Supply Unit

« on: January 18, 2011, 08:12:03 PM »

The last item to purchase for this power supply unit will be the metal enclosure.

Approx. what size box we are talking about?
Noticed in the local stores that they come in various size and they dont have any holes for ventilation. Do I punch some holes on the side?

The cable for the 110VAC will be 14AWG two conductors + the copper ground wire.
What size wiring from the toroidal to the 110VAC terminal strip?
And what size wiring from the toroidal to the rectifier and capacitors?

Thanks

853

General Mach Discussion / Re: Wiring Limit & Home Switch

« on: January 18, 2011, 08:10:09 PM »

Sounds like an excellent idea brtech, thanks for pointing out to me

I also revised my schematic

854

General Mach Discussion / Re: Wiring Limit & Home Switch

« on: January 18, 2011, 06:15:55 PM »

I made the attached simple schematic

Can someone let me know if it looks ok?

Thanks

855

General Mach Discussion / Re: Power Supply Unit

« on: January 18, 2011, 03:08:44 PM »

Alright I will order the toroidal and rectifier tonight, thanks for your help

856

General Mach Discussion / Re: Wiring Limit & Home Switch

« on: January 18, 2011, 02:09:47 PM »

Thank you both, I should have been more specific but my cable is shielded.

brtech now you mentioned it I agree that the Y and A should have separate switches and I will follow this since my BOB has 4 input connections.

Regarding grounding both ends of the shield I agree that there is a controversy about this and therefore I will start by grounding the end at the BOB and see how she works.

Your last paragraph explanation is perfect

857

General Mach Discussion / Re: Power Supply Unit

« on: January 18, 2011, 01:57:35 PM »

Here is a selection of bridge rectifiers

858

General Mach Discussion / Re: Power Supply Unit

« on: January 18, 2011, 01:32:28 PM »

ok I will order the transformer you suggested Hood (unless there is another snag and fail again – seems I dont have a good luck sourcing my parts LOL

Digi-key have a weird site so I will copy the specs, like the transformers and post it back for suggestions

Much obliged for the caps and your help

859

General Mach Discussion / Wiring Limit & Home Switch

« on: January 18, 2011, 10:43:27 AM »

I started wiring my limit switches. The Y axis is driven by two motors and I will have 2 limit switches which will be used to home this axis. On the X axis I will also have 2 limit switches and on the Z axis the same.

I plan to use one cable with two wires (black and red) per axis and wire the 2 limit switches of each axis to the BOB in series. I have attached a picture of the BOB for reference

Is this a good wiring method?

860

General Mach Discussion / Re: Power Supply Unit

« on: January 18, 2011, 09:42:51 AM »

I have located some transformers and bridge rectifiers and have list them in the attached one page Word document.

Can someone pls suggest which one meets my specs?

Thanks