[Emc-users] [SPAM] Fw: new important message

[tjmarch]

Hello!

 

New message, please read 

 

tjma...@charter.net

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Re: [Emc-users] Resetting rotary movement count

[andy pugh]

On 5 January 2016 at 11:34, Dave Caroline  wrote:
> Here is an example of with and without limits in a trunnion design
> http://www.ebay.co.uk/itm/CNC-Rotary-Table-Dividing-Head-Rotational-Axis-4th-5th-Axis-A-B-Axis-100MM-Chuck-/161679996211

Here is another, the B axis on this:
https://www.youtube.com/watch?v=mEsuTX6Empc

I mention it as it is also a very simple and rigid one that would be
an easy retrofit to many tilting-head mills.

-- 
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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Re: [Emc-users] Rewiring the BP

[Dave Cole]

Just saw your message.

If you keep the VFD powered off, do you still have noise issues ??

Dave

On 1/4/2016 5:19 PM, John Thornton wrote:
> I have 3 DC power supplies in the drive side, a 5vdc, a 24vdc, and a
> 170vdc.
>
> The 5vdc power supply on the 0v side reads 37.6 ohms with the 0v and 5v
> sides connected to the 7i77 5v plug. The 7i77 is the only thing it
> powers up. When I unplug the 7i77 0v reads open so there is a path
> through the 7i77 5v to ground.
>
> The 24vdc power supply is for the limit switches and push buttons. It
> reads open from 0v to ground.
>
> The 170vdc power supply is a bridge rectifier with a large blue cap and
> a power resistor. See the photo in the link of the current panel. I
> can't tell which side should be 0v but both sides measure 0.65M ohms to
> ground. I don't know if that is reading back through the bridge
> rectifier or the drives. It only powers the three axis drives.
>
> Current panel layout http://gnipsel.com/images/bp-knee-mill/bpel06.jpg
>
> JT
>
> On 1/4/2016 10:48 AM, Bertho Stultiens wrote:
>> On 01/04/2016 05:34 PM, John Thornton wrote:
>>> Well I grounded X2 to the main ground and when I started LinuxCNC and
>>> started to home I got the flurry of sserial errors. So I thought about
>>> it for a bit and maybe the ground from the computer case to the ground
>>> block was creating a ground loop so I took it off. Started LinuxCNC and
>>> immediately go a flurry of sserial errors which locks up LinuxCNC. Mind
>>> you this is with the 7i77ISOL card between the 5i25 and the 7i77 which
>>> is supposed to block any noise in the sserial communications. The X2 to
>>> ground has to go...
>>>
>>> I do have a 7i92 to test out...
>> My guess is that you have more than one (ground-)loop. You also need to
>> check how the 0V (DC) line interacts with other devices/converters etc.
>> wrt. ground and see whether any of them also hook-up to ground somewhere
>> along the wiring, PCBs or supplies.
>>
>> The second type of loops can be (entirely) in the 0V (DC) connection(s)
>> where multiple paths, with different impedances, impair the integrity of
>> the signal lines. You need to check how the different DC supplies
>> interact with the connections as they are. The problem often becomes
>> visible when you have both high- and low-power devices connecting and
>> running on the same supply and have the 0V (DC) connected so that it
>> (can) create(s) a loop.
>>
>
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