Messages

41

General Mach Discussion / Re: Looking for good DIY controller kit supplier

« on: December 07, 2020, 11:03:19 PM »

The wiring diagram will make the job easy, thanks. I've started stripping the CNC of its harness and am working on the mounting board. I thought I'd mount all components proud off the surface by some 5 mm to allow maximum airflow around the objects ... should help with cooling on hot days.

I have a 5 amp trip fuse, good condition and works with a range of DC voltages, can use that instead of buying a new one.

The supplier for the BOB does not have the female connectors and none are supplied with the BOB, so I'll follow your suggestion and use the decoder cable.

Thanks for the animation, explains a lot

42

General Mach Discussion / Re: Looking for good DIY controller kit supplier

« on: December 07, 2020, 05:56:08 AM »

I see the microstepping now. The 1.8 degrees is determined by the number of 'teeth' of the permanent magnet on the rotor, the step is activated by an electromagnetic field in the stator. Direction is determined by polarity with change of direction determined by change in direction of current applied to the stator. Rate and step size of rotation is achieved by playing multiple windings (Min 2) off against each other in terms of current strength, direction and sequence. I'm still to fully understand Phase Current Waveform. 

43

General Mach Discussion / Re: Looking for good DIY controller kit supplier

« on: December 07, 2020, 04:18:28 AM »

Thanks MN300, I'll pore over the micro stepping article and TB6600 manual.

Drove the distance to Jaycar today, lousy customer service but came back with the following:
E Stop - https://www.jaycar.com.au/latching-emergency-stop-switch/p/SP0786
5 V power supply - https://www.jaycar.com.au/5v-dc-3a-slim-power-supply-7dc-plugs/p/MP3480
Terminal block for 24V supply from BOB to TB6600s
but no cable. "Look in the catalogue" was the reply, at a cost of just under $6.00; so ordered the cables from a very helpful person at Makerstore P/L - awaiting delivery.

Also received by post: BOB and 3 TB6600s. I opened the driver up to see if it truly had a TB6600 chip, and it does.

I'll read up on the ENA in the manual to follow your rationale and I see what you mean re the EStop if it is as per attached pic

44

General Mach Discussion / Re: Looking for good DIY controller kit supplier

« on: December 04, 2020, 11:53:11 PM »

Thanks for the answers; illustrative.

24 V power supply from Geekcreit S400-24

I have a 240 V as well as 24 V computer fan; which would be the best to fit, considering 'noise'.

value shown is 2 amps but that might be increase when I see the supply info; by 'supply info' you mean the specs of the Geekcreit S400-24?

5 V it is

45

General Mach Discussion / Re: Looking for good DIY controller kit supplier

« on: December 04, 2020, 11:17:51 PM »

Y or N; 4.5 V 500 mA instead of 5 V power supply?

46

General Mach Discussion / Re: Looking for good DIY controller kit supplier

« on: December 04, 2020, 09:59:58 PM »

I follow the noise rationale

Every cable on my CNC is UNshielded. I will replace all with shielded twisted pair cable; as said before - not too expensive.
Pls advise though, is 0.4 mm 4 core suitable for the steppers or should it be 0.5 mm precisely?

The 24V power supply I've ordered is a direct equivalent to the LRS-350-24  but 400 instead of 350W.

Thanks for the layout drawing. I'm installing everything on the outside of my wooden computer hutch. 15 mm thick ply and a further 200 mm away from the nearest computer cable. Should be nil noise. I've decided to put it there as there is maximum chance of air cooling. The system is in a shed, which during summer times hits 42 degree C.

Some questions:

"I was going to use a solid state relay for the spindle but decided not to. It would have meant using P17 which is shared with the onboard relay, that's why the relay jumper was OFF. However I'm using the small onboard relay to control the spindle relay so it needs to be ON".
; I do not really understand this, MN300, where is the small onboard relay?

On the BOB connectors; what do CW and EM stand for?

On the 24 V Power Supply; what do L and N stand for?

Just below is a squiggle with F1 and 2A; what is the squiggle and what do F1 and 2A stand for?

On the 230 VAC; this is mains power, is it not? What does the E stand for?

On the TB6600; what do ENA and VCC stand for?

47

General Mach Discussion / Re: Looking for good DIY controller kit supplier

« on: December 04, 2020, 12:04:59 AM »

OK, it arrived. That's the CNC; didn't know if the attachments would work this time.

Everything associated with the CNC including the computer is run via a dedicated power board. No piggybacking of any sort. One switch to turn it all on and off.

I can suspend the power cable for the Bosh overhead and well out off the way of other cables. The Limit and Motor cables will run through the drag chains, but once they exit I can truly separate them. Variations to the theme will be seriously considered.

Is a 0.4 mm 4 core cable suitable or is 0.5 mm minimum requirement. I'll replace all the cables as then I will not have to splice or fit contacts to extend them. One length of cable from the motors and switches to the TB6600s and BOB. Max length is for the Z axis motor and limit switches; 4 meters each. Each drag chain is approx 1.5 m and the distance from the end of the last chain to the best position for the control is 1 m. The last distance may be whittled down to 0.5 m, but I prefer the more distant position.

48

General Mach Discussion / Re: Looking for good DIY controller kit supplier

« on: December 03, 2020, 11:45:19 PM »

?

49

General Mach Discussion / Re: Looking for good DIY controller kit supplier

« on: December 03, 2020, 09:31:51 PM »

Buying quality is preferred, but Yep, true, in hobby world dreams meet the purse strings.

I looked at the Limit Switches, they stop current flow when activated .... that's NC, isn't it. If yes, it's a little counter intuitive as you can not walk through a closed door .

The cables attached to the motors and switches are "Black Box Corp 6/C Type CMR (UL) c(UL) 75C E116394; is that a suitably shielded cable or best totally replaced?

In relation to the spindle control; I would prefer to initially keep my present set up, which is mains power and manual speed control by adjusting the potentiometer built into the spindle motor casing. I would certainly like to upgrade the spindle control to a computerised one as a future project.

A request for specs to determine quality, for all the required items yet to be purchased has been sent to a few suppliers. Awaiting a reply.

I saw the # X Axis LS and yes, did not understand .... will speak up next time.

I'll give you the specs of items (to be) purchased as they arrive.

What Mains Switch are you talking about, MN300, the wall switch for the 240V power supply?

50

General Mach Discussion / Re: Looking for good DIY controller kit supplier

« on: December 03, 2020, 04:32:34 AM »

With ZASto's combo and MN300's rumba; how can I loose. I've come across pure talent here.
Thanks for the info fellas, will lob into jaycar with the purchase list as well. Save myself some money but won't forget the copper plated aluminium.
I'll check to see if the switches are NC or NO
TPS, have you just come rolling in from a party, stood next to some guys shrouded by smoke?