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Post by silverfox on Jul 15, 2020 11:13:36 GMT
Am collecting my refurbed motor in about an hour to rewring back to the swtich
Sods Law decrees the noted i made on wht wire goes where have been stolen by the engineering gremlins that live in my shed
If i look at it face on i have 4 terminals (1-4)to the left and 5-9) to the right
The power is attched to the LH side as follows
T1 Brown T2 not used T3 Blue T4 not used
Terms 5-9 are
T5 Earth ( from mains) Also earth from motor ( i remember that bit!!) T6 i think was a blue wire T7 was used but it wasnt blue!! possibly brown T8 i think was blue also No stripes of different colour T9 no used
I do know that the terminals 6,7,and 8 were the ones the wiring from the motor came off
Now as regular readers know, i am more fluent in Mandarin (i only know happy new year, and the word for rubbish) than Electrical knowledge so have not a clue on amps, windings volts etc, Sad but very true, and believe me i have tried over the years.
IIRC regarding the blue wires, would i be right if i connected these up to T6 and T8 and if the motor goes backwards to reverse them ot should one go on T7
I do not want to have a trip up to A+E looking like a burnt crisp !
Thanks
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Post by Roger on Jul 15, 2020 11:27:02 GMT
Am collecting my refurbed motor in about an hour to rewring back to the swtich Sods Law decrees the noted i made on wht wire goes where have been stolen by the engineering gremlins that live in my shed If i look at it face on i have 4 terminals (1-4)to the left and 5-9) to the right The power is attched to the LH side as follows T1 Brown T2 not used T3 Blue T4 not used Terms 5-9 are T5 Earth ( from mains) Also earth from motor ( i remember that bit!!) T6 i think was a blue wire T7 was used but it wasnt blue!! possibly brown T8 i think was blue also No stripes of different colour T9 no used I do know that the terminals 6,7,and 8 were the ones the wiring from the motor came off Now as regular readers know, i am more fluent in Mandarin (i only know happy new year, and the word for rubbish) than Electrical knowledge so have not a clue on amps, windings volts etc, Sad but very true, and believe me i have tried over the years. IIRC regarding the blue wires, would i be right if i connected these up to T6 and T8 and if the motor goes backwards to reverse them ot should one go on T7 I do not want to have a trip up to A+E looking like a burnt crisp ! Thanks I don't think anyone will be able to fully grasp what you're describing without some pictures and perhaps some sketch as to what was wired to what. Textual descriptions are very difficult to follow.
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uuu
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Post by uuu on Jul 15, 2020 11:39:58 GMT
T5 is not earth on this one! The earth is next to 5 - earth is on the right in this photo, then 5,6,7,8 coming left - is yours numbered differently?: Here's a wiring diagram: Wilf PS - I've not got one of these, I just Googled.
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Post by silverfox on Jul 15, 2020 12:08:22 GMT
uuu I just numbered them as i saw them, perhap i should have said there are 4 each side with an earth on the RHS top and Yes that is exacly like the one i have Did you miss the bit where i said i do not have the first idea about electicity lol The one at the top right was earth for both motor and mains So 5 was blue 6 was the 'forgotten colour' 7 was blue 8 was not in use Anyway off to pick it up now. If there are no more posts from me you can assume i got it wrong!! So goodbye lads ( but hopefully not) This is a very nice forum.. I will get my wife to let you know when the funeral is Nothing like being positive................. Is that an electrical term? Ron
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Post by coniston on Jul 15, 2020 12:37:33 GMT
Do a google search, there are many diagrams available. Dewhurst switches are not easy to understand unless you check which bars are connected or not. I have some photos somewhere from when I rebuilt one last year, I'll try and dig them out.
Chris D
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gwrfan
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Post by gwrfan on Jul 15, 2020 12:56:28 GMT
There's an article about this switch, and others, in this week's Model Engineer No 4643 page 151.
Geoff
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Post by ettingtonliam on Jul 15, 2020 13:01:03 GMT
When I had a problem deciding which wire went where, I took the Dewhurst with me to the motor repairer, and he sorted it out for me. Ask the experts!
Theres usually a wiring diagram on the inside of the switch cever.
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Post by silverfox on Jul 15, 2020 14:12:00 GMT
Wilf
Having just got back i have four wires!! 2 blue, 2 brown. one of the blue and one of the broen i put knots in....... the sketch i did was going to be a help!!
In that drawing you put up Any ises what A, AZ, t, and Z refer to for the wires out of the motor?
Geoff And before i rush off the WHS ..is the article any help?
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Post by uuu on Jul 15, 2020 14:19:26 GMT
If you can say the make of motor you have and if there are any markings on the terminals, it would help.
Wilf
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Post by goldstar31 on Jul 15, 2020 14:31:35 GMT
Have a look at Home Model Engine Machinist site for me( Goldstar31) writing and getting replies just a few weeks back.
Mine was a split phase one but again the Myford Super7 and ML7 manuals w ith Dewhurst wiring are on the 'net.
Norman
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Post by gwrfan on Jul 15, 2020 15:11:28 GMT
Geoff And before i rush off the WHS ..is the article any help? Well, it wasn't really for me as I had already stripped mine down and put it all back together after cleaning everything up! The wires are a nightmare, but I took a photo of mine, and everything went back ok - except for the 2 nuts on the spindle. I hadn't used a strong enough split washer and the nuts came lose, and everything turned, but not off, LOL! Eventually found a good washer and 2 thin spanners to tighten the spindle up. Put it all back, cover on, and turned it on, only to find it was now 180 degrees out! So for 'Forward' read 'Reverse' LOL! At least it's now nice and tight. Geoff
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Post by silverfox on Jul 15, 2020 15:43:08 GMT
Geoff
You appear to be above me in the knowledge stakes!
Anyway the latest from the shed
took to cover off the motor to find the following
There are 4 terminals indicated A AZ(A2?) Z T
The colours attached to each are
A and AZ (A2?) Brown Z and T Blue
Also located the Manual for the lathe and on Page 15 fig 25 there is an easy to understand line diagram The row of terminal between motor and switch did throw me as does the different colours and terminal details It shows brown and blue fro the mains and red and black for the motor and terminals marked A1 A2 Z1 Z2 but i think i have it apart from two, hopefully final questions
Going back My switch has from the mains plug
T1 Brown shows as brown in diagram T3 Blue shows as blue in diagram
So that seems OK
Now The fig shows motor term A1 as black going to switch T5 motor term A2 as black going to switch T7 motor term Z1 as red going to switch T2 motor term Z2 as red going to switch T6
I take it that my motor terminal A and AZ( A2?) correspond with A1 and A2 on fig 25 and that the colour black in fig is my Brown Also my motor terminals Z and T correspond to Z1 and Z2 in fig 25 and the cable shown as Red is my motors blue?
If i connect it up with with my A going to T5 A2 T7 Z T2 T T6
AND it runs ok i shall leave it
IF HOWEVER When switch says forward and it runs reverse, what two wires do i need to swap?
So apart from different cable colours and terminal markings i am getting along ok lol
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Post by uuu on Jul 15, 2020 16:50:55 GMT
In the diagram I posted above AZ goes to T5 and A goes to T7, so you could try that (swapping them over). These are the "running" windings.
Wilf
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Post by goldstar31 on Jul 15, 2020 17:11:25 GMT
John Baron writing as 'BaronJ wrte to me on HMEM on 5th March with the wiring detals from his Myford Super 7 manual.
All that you need is a print out-- and a box of child's crayons.
I still have a spare Myford motor for 'conventional wiring.
A few days ago, I took delivery of TWO switches, one for the Worden which I am building, and the other for the earlier version of the Kennet.
Two different designs but I thought that you would have YOUR diagram on the cover plate- over the motor wiring.
I get my coat
Norman
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Post by silverfox on Jul 15, 2020 17:14:42 GMT
Norman
Nothing on the coverplate at all ,nor on the inside of the cover for the switch, will look up what the old colours changed to and bite the bullet, Whats the worst that could happen lol
Using what i have got i shall take the blue on the motor as the old black and the brown as the old red
looking at the myford diagram ( which is all i have) i shall connect the blue on A1 to T5 the blue on A2 to T7
The brown on Z to T2 and the brown on T to T6
I have a fusebox in the shed on a separete feed from the main board so if anything goes bsng i dont have to trot back inside every five mins,and if the motor runs backwards chgange over the brown ones as they appear to be the live feeds
So apart from different cable colours and terminal markings i am getting along ok lol Foe me it is like coverting Spanish (which i canot speak) to Italian( ditto) and hopefully getting English at the end
surely it cannot be that difficult lol
So apart from different cable colours and terminal markings i am getting along ok lol
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Post by gwrfan on Jul 15, 2020 17:45:00 GMT
Geoff You appear to be above me in the knowledge stakes! No way! These electrical things are way beyond me, haha.
AND it runs ok i shall leave it IF HOWEVER When switch says forward and it runs reverse, what two wires do i need to swap? So apart from different cable colours and terminal markings i am getting along ok lol According to the article and its diagram (very basic) it says: 'if the motor runs the wrong way then swap the wires to No. 2 and No. 6'. 2 and 6 are the Start terminals, number 2 second one down on the left, and No 6 second down on the right, so opposite each other. I'm just going to stick a patch over my controller 'Forward' and 'Reverse'. I can live with that, haha.
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Post by silverfox on Jul 15, 2020 18:12:18 GMT
Geoff
Thanks 2-6 eh???
Isnt' that something to do with the gunnery crew on board ships in Nelsons day something to do with the sailors on the ropes to haul the gun back to the gun port after reloading
My Scoutmaster (Name drop Bruce Forsyths cousin), who appeared on Bruces 'Who do you think you are' prog always said 2-6 heave, when we had to pull the camping cart
If it goes dark in cornwall in an hour or so, you know it is wrong!!!
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gwrfan
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Post by gwrfan on Jul 15, 2020 19:05:33 GMT
Geoff Thanks 2-6 eh??? Isnt' that something to do with the gunnery crew on board ships in Nelsons day something to do with the sailors on the ropes to haul the gun back to the gun port after reloading My Scoutmaster (Name drop Bruce Forsyths cousin), who appeared on Bruces 'Who do you think you are' prog always said 2-6 heave, when we had to pull the camping cart If it goes dark in cornwall in an hour or so, you know it is wrong!!! Haha! Yes, I'm a casual sailor myself. Perhaps I should remember '2 - 6 heave' when pulling the anchor up, haha. And, yes we still have limited leccy down here on Bodmin Moor, LOL Geoff
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Post by goldstar31 on Jul 15, 2020 19:44:52 GMT
I have just Googled and got the Myford Super7 pdf.
Figure 25 has a very plane circuit using a 6 position bus bar which is quite simply one of those white or clear terminal blocks from anyewhere. Mine came from Screwfix.
Failing numbers on thr Dewhurst swith- number from the handle end.
What you are involving yourself with is SIX ends plus the rsrth. The A's are for the main winding whilst the other ones link with the 2 wires out of the condenser and the other 2 the start windings does this help? I've got to re-wire the Kennet onto the 9 terminals on the new switch. In stead of just off and on.
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Post by simplyloco on Jul 15, 2020 20:32:22 GMT
I didn't realise that Dewhurst made switches, I thought they were butchers! John
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