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Member postings for John Rudd

Here is a list of all the postings John Rudd has made in our forums. Click on a thread name to jump to the thread.

Thread: Variable rpm control for watchmakers lathe
19/03/2021 12:32:27

John Fletcher, pm sent...please.

Thread: HydroVane PR303E question
15/03/2021 15:34:05

 

 

I asked him "what work exactly has been done to this compressor as it is described as 'seller refurbished', did you use any spares?" (potential for mis-selling, not as described)

 

It wouldn't surprise me if it didn't sell....

 

Just got a reply on the instructions...£20....Greedy!!

Edited By John Rudd on 15/03/2021 15:41:10

Thread: Warco mini lathe
08/03/2021 08:20:55

There is an error....

The default M display is 0 not 1 as written...showing spindle speed.

08/03/2021 08:19:46

Hope this of use....WM180.jpeg

Thread: Chester DB10 speed question
03/03/2021 14:14:23

Running in reverse with a lower speed is by design on these machines....

Thread: Warco mini lathe
01/03/2021 18:14:17

Cheers Ian....

Just about sorted it now..

01/03/2021 16:46:29

Ian,

I've sent you a pm...

26/02/2021 07:58:02

Ian,

Thats a great help...

Should be able to get the machine running as it should now......👍

Thanks.

25/02/2021 21:35:20

Ian,

Thanks thats great....Just what I needed.

Do you have any idea on how the buttons work?

I think the green M button switches the motor on, the Red one, off. The two either side cause a change in direction, but what about the + or - buttons...?

Any help appreciated...

25/02/2021 15:55:35

I have one of the earlier Warco mini lathes that has the digital speed readout panel whereby the speed is set via touch buttons rather than a speed control potentiometer....

It looks like the machine has been tampered with in the past...

So before I start pestering Warco, if there are any owners of a similar machine, could they tell me where is the little speed pick up board secured inside the end housing where the change gears reside?

I can see the slotted disc, but there's nowhere for the opto coupler device to be secured....I cant see how it attaches...

 

A photo would be a great help...

 

Many thanks

J.

Edited By John Rudd on 25/02/2021 15:56:30

Thread: Warco 180 mini lathe
18/02/2021 14:24:51

Ken,

You have a private message, refer to the top of the page a flashing envelope,

Thread: warco wm16 miller
02/02/2021 19:51:42

Have a look at the manual for the G0704....

https://cdn0.grizzly.com/manuals/g0704_m.pdf Page 45 shows the wiring for the KEDA ZH-A 3 position rotary switch....

02/02/2021 19:33:18

In the last foto, you highlighted a Blue wire that, to me, looks like it goes to the A- connection on the speed control board. That being the case the wire needs to be connected to the FWD/REV switch...You will need to trace the motor wires back to the switch and try and determine which connection it is on the switch....

Thats the best I can tell you for now.....A better look at the switch would help....but looking at the G0704 wiring it looks like it could be terminal 5 on the switch

 

The PM25 machine referred to above is a brushless motored version....a different beast altogether...

 

Edited By John Rudd on 02/02/2021 19:40:21

Thread: Warco super major milling machine
31/01/2021 14:02:31

The motor is a cap start cap run type, hence the blue black cylinder things...

As for motor removal, I'm sure this has been covered elsewhere on the forum...

 

https://www.model-engineer.co.uk/forums/postings.asp?th=164598

Edited By John Rudd on 31/01/2021 14:07:55

Thread: Replacement motor control box for mini mill
27/01/2021 10:45:30
Posted by andrew lyner on 26/01/2021 18:03:24:
Posted by John Rudd on 20/01/2021 13:53:51:The scr’s are triggered by the low level electronics. If the supply to these isn’t present then the scr’s won’t be triggered at all....Check the 15K 2W carbon resistor adjacent the 0.01Ohm current sensing resistor.....

Spot on - well done - the 15k carbon resistor is O/C. So none of the control circuit gets any power. Is the other resistor in parallel just a backup to keep some bias on the downstream bits?

Actually 2W rating doesn't leave a lot in hand (200V squared / 15K is 2.5W) so a bigger replacement may be a good idea. The way it's mounted implies they expect it to get warm.

The purpose of the 100k resistor isnt clear...Its value is too high and its rating too low to be of any useful purpose.

I generally replace the 15K carbon unit with a 5 Watt ceramic wirewound type for a lasting repair...(I've told all my secrets now...)

Thread: Using an old microwave transformer
24/01/2021 18:33:33

As I understand it, the purpose of the shunt(s) is (are) to aid regulation of the transformer in either current or voltage......

Thread: Smart Meters & temperature/BA thread size relationship
24/01/2021 16:04:45

Edited.....self moderated....🤔

Edited By John Rudd on 24/01/2021 16:08:25

Thread: Warco VMC mill wiring diagram
21/01/2021 16:28:58

Glyn,

That is just what is needed, many thanks...

 

Duncan, if you can identify SQ1&2, we can go from there...I suspect they are belt cover and chip guard interlocks.

Do you have a dvm at all?

Edited By John Rudd on 21/01/2021 16:31:50

21/01/2021 13:35:49

Duncan,

not sure if pm caters for pictures,

I'll pm you my email address..

21/01/2021 12:36:53

Wiring

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