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Member postings for Avon

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

Thread: How to Adjust Old Breaker
22/11/2020 15:28:42

HI Nick,

Spot on - there's a slight raised area on the clip which is moved away from the trip bar when pulled out.

Interestingly, the option of dividing the 'live' across the contacts would effectively reduce the current in each. In order to simply ensure consistency between phases they would need to be wired in series.

Regards Peter

22/11/2020 13:39:19

HI All,

Well some success with the existing setup. It appears that the adjustment on this contactor is simply to pull the clips tabs out on each contactor (2A pushed in, 2.75A pulled out according to the notice which I found hiding in the bottom). See photo below. The clips are looped bits of brass at the end of each arm - they appear to be holding the bale arm in the photo.

Definitely no NVR, but it seems to be working ok now and I'm the only one who uses the workshop.

Will probably investigate a starter, but for now I just need to find some sharp tools!

Many thanks.

Peter

da2f3283-77b8-4fc0-b3a6-76794832753d.jpeg

20/11/2020 12:33:22

I think Mike P is probably spot on - a good description of the device.

Nick, there's no other switchgear and certainly no coils - I've had it all out to replace degraded cabling. The two pairs of wires at the top: one pair to the main winding and the second (via a changeover switch for forward/reverse) go to the switched starter winding (physically out of phase with the main winding to create a starting effect as I understand it, it is switched by a centrifugal switch in the motor). There's no NVR mechanism.

20/11/2020 09:37:47

Thanks Clive,

I'll take it out this weekend and see what I can find.

I don't actually know when it last ran properly as I stripped and rebuilt it without having tried to run it (probably should have done). I have stripped and cleaned the motor and both windings have insulation readings in excess of 10M.

Regardless of what I discover I will pursue Mike's suggestion of fitting a new unit - it had crossed my mind to do so anyway.

I'll update the thread with findings!!

Peter

19/11/2020 22:39:15

Thanks Dave, I'll do that, that said it's been single phase as long as I remember and I've merely replaced the old wiring.

Ill have a go over the weekend.

19/11/2020 21:13:10

Hi Steve,

I'll investigate that idea. Do you know of any that could have remote make and break contacts. I ask because I'm keen to retain the front panel which has the Start button in the centre of the panel and the stop at top right. I doubt anything current will be laid out exactly the same and so a couple of small microswitchs could be used to trigger the MCB.

Regards

Peter

19/11/2020 20:59:50

Hi,

The attached photos show the contactor fitted to my Centec 2A. Although the contacts close and the motor runs well almost any load will cause it to trip. I've checked the motor windings and they have good insulation and the whole machine runs smoothly.

The label on the contact suggests they're adjustable, but I can see where or what I would adjust - any ideas gratefully received.

One thought I had was that the trip is activated by overcurrent affecting a bimetallic strip and I wonder whether its due to the insulation material around the thermal strip having perished and dropped away over the years. If so can anyone suggest what to replace it with?

Grateful for any ideas.

Regards

Peter

f1d1f34c-bdda-47c7-a7b1-9db7dd0eb5ff.jpeg

ddbfff7a-ca43-4963-b693-aa9065c5914a.jpeg

3a91c056-18d8-48c9-b235-25520a60ebed.jpeg

Thread: How to be accurate!
08/11/2020 18:12:01

Dear All,

Many many thanks for your many and varied responses. In summary:

1.Think about using a plug guage rather than calipers,

2, Small cuts, and

3. Make d..n sure that tool is sharp.

I think this is a thread I may refer too again in the future.

Thank you all for your comments.

Peter

07/11/2020 17:23:58

I have been trying to bore a 0.6" hole in an aluminium pulley using my S&B Model M Mk 1. To my mind this is a very simple task in a machine that shouldn't have any issues whatsoever. This was my technique:

1. Drill the centre using firstly 1/4" then 1/2" HSS drills held in the tail stock.

2. Progressively bore the hole until it was 0.590" using a home made cutter held in a holder that my father had made: looks to be maked from hex bar turned and drilled to mount a cutter ground from 3/16 rod.

3. Final cut of 0.005" to remove the last 0.01" from the diameter of the hole. End result a hole that is 0.604" - usable, but 0.004" greater than intended.

Possible causes:

a. I didn't look carefully when applying the cut and added 0.007" - I'm pretty sure I didnt.

b. The cutter bar 'sprang', but I was careful to make the final cut a light one to avoid that and had made several passes of the previous cut to make sure it was 'on size'.

c. When I thought the hole was 0.590 it was actually 0.594". This is possible as I'm using a digital caliper to measure the inside diameter and I do get different readings on occasion, but I was careful to check for consistent readings before deciding how much to remove.

d. Did I grind the tool incorrectly? I attempted to have a slight rake and with a rounded cutting edge - I certainly wouldn't claim to have set it to any particular angle and there was some slight buildup of aluminium on the cutter, but if anything I would have expected that to reduce the depth of cut not increase it.

I'm keen to be able to turn accurately and would like to know where others think I might have gone wrong.

Grateful for your thoughts.

Thread: What size pipe connector?
30/10/2020 22:02:19

Thanks guys, glad to see there's no absolute answer. It's definitely 3/16 so not sure.

Any suggestions for good suppliers?

29/10/2020 23:35:43

i have what looks like a Stuart 5 or 7? Vertical with reversing gear. It doesn't have an 'S' on the valve cover. I'm trying to identify the air/steam connector thread size. The internal diameter is 3/16". What thread do you think it might be and where is the best place to buy fittings?

Many thanks.

Thread: How to strip a Centec 2A Vertical Milling Head
27/07/2020 22:35:19

Hi Duncan,

I counted 28 on the driving shaft and 32 on the driven. By my calcs that gives approx 15% reduction in speed of 1600 input shaft and 1400 at the quill. Photos below:

Hope that helps.

photo 27-07-2020, 22 04 07.jpg

photo 27-07-2020, 22 07 09.jpg

photo 27-07-2020, 22 03 33.jpg

Edited By Avon on 27/07/2020 22:38:24

Thread: centec 2a halfnuts
19/07/2020 20:17:26

Hi David,

Address received - will post next week.

Yes I do have the handbook - not really sure where I got it actually, its in PDF - did you send it a while ago?? (i'm getting increasingly forgetful!!).

I found a centec router on ebay, which looks like it might fit - and I think I have some of the other items that are with it - I'll have to have another look in Dad's workshop as it may still be there since I wouldn't have known what I was looking for!

All the best.

Peter

17/07/2020 09:17:44

Hi David,

Can you message me with your address and I'll get it sent back - absolutely not a problem, I'd rather it was in a good home and I know what you mean about searching for things you no longer have!!

Hi Dave Halford - I've never been aware of a slotting machine, though the name obviously gives away the intent. I guess its an adaptor intent on languishing in a box until its use is obvious!!

Hi 'not done it yet' - looking at the half nut supplied by David I suspect that my father was trying to make a halfnut and then decided that a full nut was easier, I can even see where he filled in the slot.

Regards

16/07/2020 12:07:28

Hi David,

Amazing response - really appreciated as parcel arrived this morning. But sadly it’s the smaller size as mentioned elsewhere. I can either return it or hold it in case someone else has a need.

I guess we should have checked. Such is life.

Let me know what you’d like me to do.

All the best.

Peter

15/07/2020 18:17:17

Hi Duncan,

Email sent with both DXF and DWG. For info the link to the ONSHAPE drawing is:

https://cad.onshape.com/documents/a2e0a0ebaf385baddcff3f15/w/d4fa5ebbd6215d9ab93d4805/e/cf7ccd99fd7d2bb21ba9292c

I use 1/128" as that's what my calipers give me - I'm measuring as built/worn out so its almost never a nice number, though on occasion I have thought that my lathe in particular is more metric than imperial!

For info, do you have any idea what dirty green accessory might really be for in my picture above? Its a perfect fit to replace the Quill Head on the Mk3 vertical unit, but I found nothing in my fathers workshop to fit it - my suspicion is it should be a grinder attachment, but thats a guess.

Any ideas?

All the best.

14/07/2020 14:19:40

Full NutHi Duncan,

Hope these help. If you want more from the drawing I can share using Onshape (my goto CAD package)..

Regards

full nut drawing

14/07/2020 11:31:39

Hi Duncan,

I removed the table before I even discovered the nut - its about 30years since I've seen this mill working so have been stripping it blind!. I'll do a drawing and photo of mine and post here - it might be more helpful.

Shouldn't take too long.

Regards

14/07/2020 11:07:55

Dave, not done it yet,

At this stage I've not even started to think precisely what I'll use it for, and certainly won't be commercial. But since I'm spending the time refurbishing it I thought I'd like to restore it to as near original as I can.

I suspect that like Dave, I'll not be bother to do it too often, unless I can use the quick feed to actually make a cut on each pass. It did occur to me that since I have an adaptor (see photo) for the Mk3 Vertical Head that looks like it should hold a grinder perhaps I would use the quick feed in that circumstance.

Regards

vertical mill accessory.jpg

12/07/2020 23:29:29

Mine is the underdrive version and just checked that the leadscrew (is that the right term for a Milling Machine?) is 5/8".

Mine has a full nut which obviously can't be disengaged - I assume my father fitted it, but really not sure. Neither am I sure whether I need to fit a Half Nut - it seems correct to do so as that was how it was designed, but a number of posts suggest the quick traverse facility isn't really needed?

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