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mgj17/12/2009 11:36:36
1017 forum posts
14 photos
Les  when I said an NVR switch I meant like one of those Brooks double pole contactor starter box jobs, so when its off the machine is properly isolated.
 
Of help to Bill - they come with a decent diagram, and you just take the wires "straight across". There is one bridge but that is well illustrated.
 
I am certain you will know exactly what I mean. 

Edited By meyrick griffith-jones on 17/12/2009 11:37:27

Les Jones 117/12/2009 12:35:37
2292 forum posts
159 photos
Hi Meyrick,
                      The cheap ones they use today  seem to have done away with the push to make start button and the start button mechanically pushes the contactor closed. The one on my Chester DB10G lathe is like this as was the one on my pillar drill until I replaced it.
Les.
Cornish Jack17/12/2009 18:25:12
1228 forum posts
172 photos
Les and Meyrick - again many thanks. You have both gone to a great deal of trouble and it's much appreciated.
Meyrick - The NVR switch could well be worthwhile(believe I have one , somewhere). The need to reverse the motor is due to the Worden method of operation - the support table is adjustable for vertical angle but the horizontal angle is varied about the centre of the table so grinding would need to be carried out on both left and right edges of the wheel. The motor has to be reversed to avoid grinding on an upward moving periphery.
Les - Thank you for the offer of a 'phone chat on this. I'll let you have my email and tel No. but it seems to be a bit of an imposition, so please make sure that you are not out of pocket. I think I can make sense of your explanation of the switching sequence so I'll get checking with the AVO and hope it will clear even more of the fog
mgj17/12/2009 20:45:06
1017 forum posts
14 photos
Well I bow out because Les clearly knows a lot more about this than I. However, I have been through this mill a few times wiring up a Quorn, the Myford twice, and the motors on the Dore Westbury, and I know that sinking feeling that comes when one has a motor, a capacitor or two (separate), and a diagram that one doesn't follow with certainty. Add to that the surety that its going to be expensive if you get it wrong........
 
It'll all make a lot more sense once you have that AVO plot, because actually all you are doing is wiring a rotary switch so that 2 wires - the ones to the start capacitor get swapped, and if the motor works but goes the wrong way for the switch direction, then you just swap those 2 wires over.  So its easy really!!!!!!
 
Radars I'm guite good at... ...and actuators and guidance control circuits, but then you don't have to wire them up!!! Real full sized volts and amps - bit iffy.
 
Les will be the man. 
 
---
 
Reversing - Jack thats my point - it doesn't matter if you have to grind on an upgoing face. ie towards the tool edge rather than against it. - unless there is problem locking the wheel. Do it quite often on the Quorn, and you have much better guarding against sparks than I. Still I don't know the set up and how the Worden toolholder is assembled, and I do accept that to be able to reverse is better. But I doubt its actually essential.

Edited By meyrick griffith-jones on 17/12/2009 20:51:16

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